зеркало из https://github.com/microsoft/docker.git
1875 строки
51 KiB
Go
1875 строки
51 KiB
Go
package daemon
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/docker/libcontainer/configs"
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"github.com/docker/libcontainer/devices"
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"github.com/docker/libcontainer/label"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/daemon/execdriver"
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"github.com/docker/docker/daemon/logger"
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"github.com/docker/docker/daemon/logger/journald"
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"github.com/docker/docker/daemon/logger/jsonfilelog"
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"github.com/docker/docker/daemon/logger/syslog"
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"github.com/docker/docker/daemon/network"
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"github.com/docker/docker/daemon/networkdriver/bridge"
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"github.com/docker/docker/image"
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"github.com/docker/docker/links"
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"github.com/docker/docker/nat"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/broadcastwriter"
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"github.com/docker/docker/pkg/directory"
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"github.com/docker/docker/pkg/etchosts"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/pkg/jsonlog"
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"github.com/docker/docker/pkg/promise"
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"github.com/docker/docker/pkg/resolvconf"
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"github.com/docker/docker/pkg/stringid"
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"github.com/docker/docker/pkg/symlink"
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"github.com/docker/docker/pkg/ulimit"
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"github.com/docker/docker/runconfig"
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"github.com/docker/docker/utils"
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)
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const DefaultPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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var (
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ErrNotATTY = errors.New("The PTY is not a file")
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ErrNoTTY = errors.New("No PTY found")
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ErrContainerStart = errors.New("The container failed to start. Unknown error")
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ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.")
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)
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type StreamConfig struct {
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stdout *broadcastwriter.BroadcastWriter
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stderr *broadcastwriter.BroadcastWriter
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stdin io.ReadCloser
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stdinPipe io.WriteCloser
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}
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type Container struct {
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*State `json:"State"` // Needed for remote api version <= 1.11
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root string // Path to the "home" of the container, including metadata.
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basefs string // Path to the graphdriver mountpoint
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ID string
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Created time.Time
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Path string
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Args []string
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Config *runconfig.Config
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ImageID string `json:"Image"`
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NetworkSettings *network.Settings
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ResolvConfPath string
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HostnamePath string
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HostsPath string
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LogPath string
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Name string
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Driver string
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ExecDriver string
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command *execdriver.Command
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StreamConfig
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daemon *Daemon
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MountLabel, ProcessLabel string
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AppArmorProfile string
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RestartCount int
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UpdateDns bool
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// Maps container paths to volume paths. The key in this is the path to which
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// the volume is being mounted inside the container. Value is the path of the
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// volume on disk
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Volumes map[string]string
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// Store rw/ro in a separate structure to preserve reverse-compatibility on-disk.
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// Easier than migrating older container configs :)
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VolumesRW map[string]bool
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hostConfig *runconfig.HostConfig
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activeLinks map[string]*links.Link
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monitor *containerMonitor
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execCommands *execStore
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// logDriver for closing
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logDriver logger.Logger
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logCopier *logger.Copier
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AppliedVolumesFrom map[string]struct{}
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}
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func (container *Container) FromDisk() error {
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pth, err := container.jsonPath()
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if err != nil {
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return err
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}
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jsonSource, err := os.Open(pth)
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if err != nil {
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return err
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}
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defer jsonSource.Close()
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dec := json.NewDecoder(jsonSource)
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// Load container settings
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// udp broke compat of docker.PortMapping, but it's not used when loading a container, we can skip it
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if err := dec.Decode(container); err != nil && !strings.Contains(err.Error(), "docker.PortMapping") {
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return err
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}
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if err := label.ReserveLabel(container.ProcessLabel); err != nil {
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return err
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}
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return container.readHostConfig()
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}
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func (container *Container) toDisk() error {
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data, err := json.Marshal(container)
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if err != nil {
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return err
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}
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pth, err := container.jsonPath()
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if err != nil {
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return err
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}
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if err := ioutil.WriteFile(pth, data, 0666); err != nil {
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return err
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}
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return container.WriteHostConfig()
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}
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func (container *Container) ToDisk() error {
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container.Lock()
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err := container.toDisk()
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container.Unlock()
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return err
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}
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func (container *Container) readHostConfig() error {
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container.hostConfig = &runconfig.HostConfig{}
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// If the hostconfig file does not exist, do not read it.
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// (We still have to initialize container.hostConfig,
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// but that's OK, since we just did that above.)
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pth, err := container.hostConfigPath()
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if err != nil {
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return err
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}
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_, err = os.Stat(pth)
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if os.IsNotExist(err) {
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return nil
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}
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f, err := os.Open(pth)
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if err != nil {
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return err
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}
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defer f.Close()
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return json.NewDecoder(f).Decode(&container.hostConfig)
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}
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func (container *Container) WriteHostConfig() error {
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data, err := json.Marshal(container.hostConfig)
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if err != nil {
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return err
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}
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pth, err := container.hostConfigPath()
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if err != nil {
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return err
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}
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return ioutil.WriteFile(pth, data, 0666)
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}
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func (container *Container) LogEvent(action string) {
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d := container.daemon
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d.EventsService.Log(
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action,
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container.ID,
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container.Config.Image,
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)
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}
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// Evaluates `path` in the scope of the container's basefs, with proper path
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// sanitisation. Symlinks are all scoped to the basefs of the container, as
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// though the container's basefs was `/`.
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//
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// The basefs of a container is the host-facing path which is bind-mounted as
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// `/` inside the container. This method is essentially used to access a
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// particular path inside the container as though you were a process in that
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// container.
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//
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// NOTE: The returned path is *only* safely scoped inside the container's basefs
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// if no component of the returned path changes (such as a component
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// symlinking to a different path) between using this method and using the
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// path. See symlink.FollowSymlinkInScope for more details.
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func (container *Container) GetResourcePath(path string) (string, error) {
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cleanPath := filepath.Join("/", path)
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return symlink.FollowSymlinkInScope(filepath.Join(container.basefs, cleanPath), container.basefs)
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}
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// Evaluates `path` in the scope of the container's root, with proper path
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// sanitisation. Symlinks are all scoped to the root of the container, as
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// though the container's root was `/`.
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//
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// The root of a container is the host-facing configuration metadata directory.
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// Only use this method to safely access the container's `container.json` or
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// other metadata files. If in doubt, use container.GetResourcePath.
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//
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// NOTE: The returned path is *only* safely scoped inside the container's root
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// if no component of the returned path changes (such as a component
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// symlinking to a different path) between using this method and using the
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// path. See symlink.FollowSymlinkInScope for more details.
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func (container *Container) GetRootResourcePath(path string) (string, error) {
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cleanPath := filepath.Join("/", path)
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return symlink.FollowSymlinkInScope(filepath.Join(container.root, cleanPath), container.root)
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}
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func getDevicesFromPath(deviceMapping runconfig.DeviceMapping) (devs []*configs.Device, err error) {
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device, err := devices.DeviceFromPath(deviceMapping.PathOnHost, deviceMapping.CgroupPermissions)
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// if there was no error, return the device
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if err == nil {
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device.Path = deviceMapping.PathInContainer
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return append(devs, device), nil
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}
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// if the device is not a device node
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// try to see if it's a directory holding many devices
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if err == devices.ErrNotADevice {
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// check if it is a directory
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if src, e := os.Stat(deviceMapping.PathOnHost); e == nil && src.IsDir() {
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// mount the internal devices recursively
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filepath.Walk(deviceMapping.PathOnHost, func(dpath string, f os.FileInfo, e error) error {
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childDevice, e := devices.DeviceFromPath(dpath, deviceMapping.CgroupPermissions)
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if e != nil {
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// ignore the device
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return nil
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}
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// add the device to userSpecified devices
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childDevice.Path = strings.Replace(dpath, deviceMapping.PathOnHost, deviceMapping.PathInContainer, 1)
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devs = append(devs, childDevice)
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return nil
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})
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}
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}
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if len(devs) > 0 {
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return devs, nil
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}
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return devs, fmt.Errorf("error gathering device information while adding custom device %q: %s", deviceMapping.PathOnHost, err)
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}
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func populateCommand(c *Container, env []string) error {
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en := &execdriver.Network{
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Mtu: c.daemon.config.Mtu,
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Interface: nil,
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}
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parts := strings.SplitN(string(c.hostConfig.NetworkMode), ":", 2)
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switch parts[0] {
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case "none":
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case "host":
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en.HostNetworking = true
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case "bridge", "": // empty string to support existing containers
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if !c.Config.NetworkDisabled {
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network := c.NetworkSettings
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en.Interface = &execdriver.NetworkInterface{
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Gateway: network.Gateway,
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Bridge: network.Bridge,
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IPAddress: network.IPAddress,
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IPPrefixLen: network.IPPrefixLen,
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MacAddress: network.MacAddress,
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LinkLocalIPv6Address: network.LinkLocalIPv6Address,
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GlobalIPv6Address: network.GlobalIPv6Address,
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GlobalIPv6PrefixLen: network.GlobalIPv6PrefixLen,
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IPv6Gateway: network.IPv6Gateway,
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HairpinMode: network.HairpinMode,
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}
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}
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case "container":
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nc, err := c.getNetworkedContainer()
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if err != nil {
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return err
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}
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en.ContainerID = nc.ID
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default:
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return fmt.Errorf("invalid network mode: %s", c.hostConfig.NetworkMode)
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}
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ipc := &execdriver.Ipc{}
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if c.hostConfig.IpcMode.IsContainer() {
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ic, err := c.getIpcContainer()
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if err != nil {
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return err
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}
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ipc.ContainerID = ic.ID
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} else {
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ipc.HostIpc = c.hostConfig.IpcMode.IsHost()
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}
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pid := &execdriver.Pid{}
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pid.HostPid = c.hostConfig.PidMode.IsHost()
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// Build lists of devices allowed and created within the container.
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var userSpecifiedDevices []*configs.Device
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for _, deviceMapping := range c.hostConfig.Devices {
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devs, err := getDevicesFromPath(deviceMapping)
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if err != nil {
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return err
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}
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userSpecifiedDevices = append(userSpecifiedDevices, devs...)
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}
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allowedDevices := append(configs.DefaultAllowedDevices, userSpecifiedDevices...)
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autoCreatedDevices := append(configs.DefaultAutoCreatedDevices, userSpecifiedDevices...)
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// TODO: this can be removed after lxc-conf is fully deprecated
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lxcConfig, err := mergeLxcConfIntoOptions(c.hostConfig)
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if err != nil {
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return err
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}
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var rlimits []*ulimit.Rlimit
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ulimits := c.hostConfig.Ulimits
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// Merge ulimits with daemon defaults
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ulIdx := make(map[string]*ulimit.Ulimit)
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for _, ul := range ulimits {
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ulIdx[ul.Name] = ul
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}
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for name, ul := range c.daemon.config.Ulimits {
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if _, exists := ulIdx[name]; !exists {
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ulimits = append(ulimits, ul)
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}
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}
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for _, limit := range ulimits {
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rl, err := limit.GetRlimit()
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if err != nil {
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return err
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}
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rlimits = append(rlimits, rl)
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}
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resources := &execdriver.Resources{
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Memory: c.hostConfig.Memory,
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MemorySwap: c.hostConfig.MemorySwap,
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CpuShares: c.hostConfig.CpuShares,
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CpusetCpus: c.hostConfig.CpusetCpus,
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CpusetMems: c.hostConfig.CpusetMems,
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CpuPeriod: c.hostConfig.CpuPeriod,
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CpuQuota: c.hostConfig.CpuQuota,
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BlkioWeight: c.hostConfig.BlkioWeight,
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Rlimits: rlimits,
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OomKillDisable: c.hostConfig.OomKillDisable,
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}
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processConfig := execdriver.ProcessConfig{
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Privileged: c.hostConfig.Privileged,
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Entrypoint: c.Path,
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Arguments: c.Args,
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Tty: c.Config.Tty,
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User: c.Config.User,
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}
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processConfig.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
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processConfig.Env = env
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c.command = &execdriver.Command{
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ID: c.ID,
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Rootfs: c.RootfsPath(),
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ReadonlyRootfs: c.hostConfig.ReadonlyRootfs,
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InitPath: "/.dockerinit",
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WorkingDir: c.Config.WorkingDir,
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Network: en,
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Ipc: ipc,
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Pid: pid,
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Resources: resources,
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AllowedDevices: allowedDevices,
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AutoCreatedDevices: autoCreatedDevices,
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CapAdd: c.hostConfig.CapAdd,
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CapDrop: c.hostConfig.CapDrop,
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ProcessConfig: processConfig,
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ProcessLabel: c.GetProcessLabel(),
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MountLabel: c.GetMountLabel(),
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LxcConfig: lxcConfig,
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AppArmorProfile: c.AppArmorProfile,
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CgroupParent: c.hostConfig.CgroupParent,
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}
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return nil
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}
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func (container *Container) Start() (err error) {
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container.Lock()
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defer container.Unlock()
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if container.Running {
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return nil
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}
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if container.removalInProgress || container.Dead {
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return fmt.Errorf("Container is marked for removal and cannot be started.")
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}
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// if we encounter an error during start we need to ensure that any other
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// setup has been cleaned up properly
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defer func() {
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if err != nil {
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container.setError(err)
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// if no one else has set it, make sure we don't leave it at zero
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if container.ExitCode == 0 {
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container.ExitCode = 128
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}
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container.toDisk()
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container.cleanup()
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}
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}()
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if err := container.setupContainerDns(); err != nil {
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return err
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}
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if err := container.Mount(); err != nil {
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return err
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}
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if err := container.initializeNetworking(); err != nil {
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return err
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}
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if err := container.updateParentsHosts(); err != nil {
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return err
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}
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container.verifyDaemonSettings()
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if err := container.prepareVolumes(); err != nil {
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return err
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}
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linkedEnv, err := container.setupLinkedContainers()
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if err != nil {
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return err
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}
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if err := container.setupWorkingDirectory(); err != nil {
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return err
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}
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env := container.createDaemonEnvironment(linkedEnv)
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if err := populateCommand(container, env); err != nil {
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return err
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}
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if err := container.setupMounts(); err != nil {
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return err
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}
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return container.waitForStart()
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}
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func (container *Container) Run() error {
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if err := container.Start(); err != nil {
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return err
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}
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container.WaitStop(-1 * time.Second)
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return nil
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}
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func (container *Container) Output() (output []byte, err error) {
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pipe := container.StdoutPipe()
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defer pipe.Close()
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if err := container.Start(); err != nil {
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return nil, err
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}
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output, err = ioutil.ReadAll(pipe)
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container.WaitStop(-1 * time.Second)
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return output, err
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}
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// StreamConfig.StdinPipe returns a WriteCloser which can be used to feed data
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// to the standard input of the container's active process.
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// Container.StdoutPipe and Container.StderrPipe each return a ReadCloser
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// which can be used to retrieve the standard output (and error) generated
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// by the container's active process. The output (and error) are actually
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// copied and delivered to all StdoutPipe and StderrPipe consumers, using
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// a kind of "broadcaster".
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func (streamConfig *StreamConfig) StdinPipe() io.WriteCloser {
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return streamConfig.stdinPipe
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}
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func (streamConfig *StreamConfig) StdoutPipe() io.ReadCloser {
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reader, writer := io.Pipe()
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streamConfig.stdout.AddWriter(writer, "")
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return ioutils.NewBufReader(reader)
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}
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func (streamConfig *StreamConfig) StderrPipe() io.ReadCloser {
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reader, writer := io.Pipe()
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streamConfig.stderr.AddWriter(writer, "")
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return ioutils.NewBufReader(reader)
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}
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func (streamConfig *StreamConfig) StdoutLogPipe() io.ReadCloser {
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reader, writer := io.Pipe()
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streamConfig.stdout.AddWriter(writer, "stdout")
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return ioutils.NewBufReader(reader)
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}
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|
|
func (streamConfig *StreamConfig) StderrLogPipe() io.ReadCloser {
|
|
reader, writer := io.Pipe()
|
|
streamConfig.stderr.AddWriter(writer, "stderr")
|
|
return ioutils.NewBufReader(reader)
|
|
}
|
|
|
|
func (container *Container) buildHostnameFile() error {
|
|
hostnamePath, err := container.GetRootResourcePath("hostname")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
container.HostnamePath = hostnamePath
|
|
|
|
if container.Config.Domainname != "" {
|
|
return ioutil.WriteFile(container.HostnamePath, []byte(fmt.Sprintf("%s.%s\n", container.Config.Hostname, container.Config.Domainname)), 0644)
|
|
}
|
|
return ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644)
|
|
}
|
|
|
|
func (container *Container) buildHostsFiles(IP string) error {
|
|
|
|
hostsPath, err := container.GetRootResourcePath("hosts")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
container.HostsPath = hostsPath
|
|
|
|
var extraContent []etchosts.Record
|
|
|
|
children, err := container.daemon.Children(container.Name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for linkAlias, child := range children {
|
|
_, alias := path.Split(linkAlias)
|
|
// allow access to the linked container via the alias, real name, and container hostname
|
|
aliasList := alias + " " + child.Config.Hostname
|
|
// only add the name if alias isn't equal to the name
|
|
if alias != child.Name[1:] {
|
|
aliasList = aliasList + " " + child.Name[1:]
|
|
}
|
|
extraContent = append(extraContent, etchosts.Record{Hosts: aliasList, IP: child.NetworkSettings.IPAddress})
|
|
}
|
|
|
|
for _, extraHost := range container.hostConfig.ExtraHosts {
|
|
// allow IPv6 addresses in extra hosts; only split on first ":"
|
|
parts := strings.SplitN(extraHost, ":", 2)
|
|
extraContent = append(extraContent, etchosts.Record{Hosts: parts[0], IP: parts[1]})
|
|
}
|
|
|
|
return etchosts.Build(container.HostsPath, IP, container.Config.Hostname, container.Config.Domainname, extraContent)
|
|
}
|
|
|
|
func (container *Container) buildHostnameAndHostsFiles(IP string) error {
|
|
if err := container.buildHostnameFile(); err != nil {
|
|
return err
|
|
}
|
|
|
|
return container.buildHostsFiles(IP)
|
|
}
|
|
|
|
func (container *Container) AllocateNetwork() error {
|
|
mode := container.hostConfig.NetworkMode
|
|
if container.Config.NetworkDisabled || !mode.IsPrivate() {
|
|
return nil
|
|
}
|
|
|
|
var err error
|
|
|
|
networkSettings, err := bridge.Allocate(container.ID, container.Config.MacAddress, "", "")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Error handling: At this point, the interface is allocated so we have to
|
|
// make sure that it is always released in case of error, otherwise we
|
|
// might leak resources.
|
|
|
|
if container.Config.PortSpecs != nil {
|
|
if err = migratePortMappings(container.Config, container.hostConfig); err != nil {
|
|
bridge.Release(container.ID)
|
|
return err
|
|
}
|
|
container.Config.PortSpecs = nil
|
|
if err = container.WriteHostConfig(); err != nil {
|
|
bridge.Release(container.ID)
|
|
return err
|
|
}
|
|
}
|
|
|
|
var (
|
|
portSpecs = make(nat.PortSet)
|
|
bindings = make(nat.PortMap)
|
|
)
|
|
|
|
if container.Config.ExposedPorts != nil {
|
|
portSpecs = container.Config.ExposedPorts
|
|
}
|
|
|
|
if container.hostConfig.PortBindings != nil {
|
|
for p, b := range container.hostConfig.PortBindings {
|
|
bindings[p] = []nat.PortBinding{}
|
|
for _, bb := range b {
|
|
bindings[p] = append(bindings[p], nat.PortBinding{
|
|
HostIp: bb.HostIp,
|
|
HostPort: bb.HostPort,
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
container.NetworkSettings.PortMapping = nil
|
|
|
|
ports := make([]nat.Port, len(portSpecs))
|
|
var i int
|
|
for p := range portSpecs {
|
|
ports[i] = p
|
|
i++
|
|
}
|
|
nat.SortPortMap(ports, bindings)
|
|
for _, port := range ports {
|
|
if err = container.allocatePort(port, bindings); err != nil {
|
|
bridge.Release(container.ID)
|
|
return err
|
|
}
|
|
}
|
|
container.WriteHostConfig()
|
|
|
|
networkSettings.Ports = bindings
|
|
container.NetworkSettings = networkSettings
|
|
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) ReleaseNetwork() {
|
|
if container.Config.NetworkDisabled || !container.hostConfig.NetworkMode.IsPrivate() {
|
|
return
|
|
}
|
|
|
|
bridge.Release(container.ID)
|
|
|
|
container.NetworkSettings = &network.Settings{}
|
|
}
|
|
|
|
func (container *Container) isNetworkAllocated() bool {
|
|
return container.NetworkSettings.IPAddress != ""
|
|
}
|
|
|
|
func (container *Container) RestoreNetwork() error {
|
|
mode := container.hostConfig.NetworkMode
|
|
// Don't attempt a restore if we previously didn't allocate networking.
|
|
// This might be a legacy container with no network allocated, in which case the
|
|
// allocation will happen once and for all at start.
|
|
if !container.isNetworkAllocated() || container.Config.NetworkDisabled || !mode.IsPrivate() {
|
|
return nil
|
|
}
|
|
|
|
// Re-allocate the interface with the same IP and MAC address.
|
|
if _, err := bridge.Allocate(container.ID, container.NetworkSettings.MacAddress, container.NetworkSettings.IPAddress, ""); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Re-allocate any previously allocated ports.
|
|
for port := range container.NetworkSettings.Ports {
|
|
if err := container.allocatePort(port, container.NetworkSettings.Ports); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// cleanup releases any network resources allocated to the container along with any rules
|
|
// around how containers are linked together. It also unmounts the container's root filesystem.
|
|
func (container *Container) cleanup() {
|
|
container.ReleaseNetwork()
|
|
|
|
// Disable all active links
|
|
if container.activeLinks != nil {
|
|
for _, link := range container.activeLinks {
|
|
link.Disable()
|
|
}
|
|
}
|
|
|
|
if err := container.Unmount(); err != nil {
|
|
logrus.Errorf("%v: Failed to umount filesystem: %v", container.ID, err)
|
|
}
|
|
|
|
for _, eConfig := range container.execCommands.s {
|
|
container.daemon.unregisterExecCommand(eConfig)
|
|
}
|
|
}
|
|
|
|
func (container *Container) KillSig(sig int) error {
|
|
logrus.Debugf("Sending %d to %s", sig, container.ID)
|
|
container.Lock()
|
|
defer container.Unlock()
|
|
|
|
// We could unpause the container for them rather than returning this error
|
|
if container.Paused {
|
|
return fmt.Errorf("Container %s is paused. Unpause the container before stopping", container.ID)
|
|
}
|
|
|
|
if !container.Running {
|
|
return nil
|
|
}
|
|
|
|
// signal to the monitor that it should not restart the container
|
|
// after we send the kill signal
|
|
container.monitor.ExitOnNext()
|
|
|
|
// if the container is currently restarting we do not need to send the signal
|
|
// to the process. Telling the monitor that it should exit on it's next event
|
|
// loop is enough
|
|
if container.Restarting {
|
|
return nil
|
|
}
|
|
|
|
return container.daemon.Kill(container, sig)
|
|
}
|
|
|
|
// Wrapper aroung KillSig() suppressing "no such process" error.
|
|
func (container *Container) killPossiblyDeadProcess(sig int) error {
|
|
err := container.KillSig(sig)
|
|
if err == syscall.ESRCH {
|
|
logrus.Debugf("Cannot kill process (pid=%d) with signal %d: no such process.", container.GetPid(), sig)
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (container *Container) Pause() error {
|
|
container.Lock()
|
|
defer container.Unlock()
|
|
|
|
// We cannot Pause the container which is already paused
|
|
if container.Paused {
|
|
return fmt.Errorf("Container %s is already paused", container.ID)
|
|
}
|
|
|
|
// We cannot Pause the container which is not running
|
|
if !container.Running {
|
|
return fmt.Errorf("Container %s is not running", container.ID)
|
|
}
|
|
|
|
if err := container.daemon.execDriver.Pause(container.command); err != nil {
|
|
return err
|
|
}
|
|
container.Paused = true
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) Unpause() error {
|
|
container.Lock()
|
|
defer container.Unlock()
|
|
|
|
// We cannot unpause the container which is not paused
|
|
if !container.Paused {
|
|
return fmt.Errorf("Container %s is not paused, so what", container.ID)
|
|
}
|
|
|
|
// We cannot unpause the container which is not running
|
|
if !container.Running {
|
|
return fmt.Errorf("Container %s is not running", container.ID)
|
|
}
|
|
|
|
if err := container.daemon.execDriver.Unpause(container.command); err != nil {
|
|
return err
|
|
}
|
|
container.Paused = false
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) Kill() error {
|
|
if !container.IsRunning() {
|
|
return nil
|
|
}
|
|
|
|
// 1. Send SIGKILL
|
|
if err := container.killPossiblyDeadProcess(9); err != nil {
|
|
return err
|
|
}
|
|
|
|
// 2. Wait for the process to die, in last resort, try to kill the process directly
|
|
if _, err := container.WaitStop(10 * time.Second); err != nil {
|
|
// Ensure that we don't kill ourselves
|
|
if pid := container.GetPid(); pid != 0 {
|
|
logrus.Infof("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", stringid.TruncateID(container.ID))
|
|
if err := syscall.Kill(pid, 9); err != nil {
|
|
if err != syscall.ESRCH {
|
|
return err
|
|
}
|
|
logrus.Debugf("Cannot kill process (pid=%d) with signal 9: no such process.", pid)
|
|
}
|
|
}
|
|
}
|
|
|
|
container.WaitStop(-1 * time.Second)
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) Stop(seconds int) error {
|
|
if !container.IsRunning() {
|
|
return nil
|
|
}
|
|
|
|
// 1. Send a SIGTERM
|
|
if err := container.killPossiblyDeadProcess(15); err != nil {
|
|
logrus.Infof("Failed to send SIGTERM to the process, force killing")
|
|
if err := container.killPossiblyDeadProcess(9); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// 2. Wait for the process to exit on its own
|
|
if _, err := container.WaitStop(time.Duration(seconds) * time.Second); err != nil {
|
|
logrus.Infof("Container %v failed to exit within %d seconds of SIGTERM - using the force", container.ID, seconds)
|
|
// 3. If it doesn't, then send SIGKILL
|
|
if err := container.Kill(); err != nil {
|
|
container.WaitStop(-1 * time.Second)
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) Restart(seconds int) error {
|
|
// Avoid unnecessarily unmounting and then directly mounting
|
|
// the container when the container stops and then starts
|
|
// again
|
|
if err := container.Mount(); err == nil {
|
|
defer container.Unmount()
|
|
}
|
|
|
|
if err := container.Stop(seconds); err != nil {
|
|
return err
|
|
}
|
|
return container.Start()
|
|
}
|
|
|
|
func (container *Container) Resize(h, w int) error {
|
|
if !container.IsRunning() {
|
|
return fmt.Errorf("Cannot resize container %s, container is not running", container.ID)
|
|
}
|
|
return container.command.ProcessConfig.Terminal.Resize(h, w)
|
|
}
|
|
|
|
func (container *Container) ExportRw() (archive.Archive, error) {
|
|
if err := container.Mount(); err != nil {
|
|
return nil, err
|
|
}
|
|
if container.daemon == nil {
|
|
return nil, fmt.Errorf("Can't load storage driver for unregistered container %s", container.ID)
|
|
}
|
|
archive, err := container.daemon.Diff(container)
|
|
if err != nil {
|
|
container.Unmount()
|
|
return nil, err
|
|
}
|
|
return ioutils.NewReadCloserWrapper(archive, func() error {
|
|
err := archive.Close()
|
|
container.Unmount()
|
|
return err
|
|
}),
|
|
nil
|
|
}
|
|
|
|
func (container *Container) Export() (archive.Archive, error) {
|
|
if err := container.Mount(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
archive, err := archive.Tar(container.basefs, archive.Uncompressed)
|
|
if err != nil {
|
|
container.Unmount()
|
|
return nil, err
|
|
}
|
|
return ioutils.NewReadCloserWrapper(archive, func() error {
|
|
err := archive.Close()
|
|
container.Unmount()
|
|
return err
|
|
}),
|
|
nil
|
|
}
|
|
|
|
func (container *Container) Mount() error {
|
|
return container.daemon.Mount(container)
|
|
}
|
|
|
|
func (container *Container) changes() ([]archive.Change, error) {
|
|
return container.daemon.Changes(container)
|
|
}
|
|
|
|
func (container *Container) Changes() ([]archive.Change, error) {
|
|
container.Lock()
|
|
defer container.Unlock()
|
|
return container.changes()
|
|
}
|
|
|
|
func (container *Container) GetImage() (*image.Image, error) {
|
|
if container.daemon == nil {
|
|
return nil, fmt.Errorf("Can't get image of unregistered container")
|
|
}
|
|
return container.daemon.graph.Get(container.ImageID)
|
|
}
|
|
|
|
func (container *Container) Unmount() error {
|
|
return container.daemon.Unmount(container)
|
|
}
|
|
|
|
func (container *Container) logPath(name string) (string, error) {
|
|
return container.GetRootResourcePath(fmt.Sprintf("%s-%s.log", container.ID, name))
|
|
}
|
|
|
|
func (container *Container) ReadLog(name string) (io.Reader, error) {
|
|
pth, err := container.logPath(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return os.Open(pth)
|
|
}
|
|
|
|
func (container *Container) hostConfigPath() (string, error) {
|
|
return container.GetRootResourcePath("hostconfig.json")
|
|
}
|
|
|
|
func (container *Container) jsonPath() (string, error) {
|
|
return container.GetRootResourcePath("config.json")
|
|
}
|
|
|
|
// This method must be exported to be used from the lxc template
|
|
// This directory is only usable when the container is running
|
|
func (container *Container) RootfsPath() string {
|
|
return container.basefs
|
|
}
|
|
|
|
func validateID(id string) error {
|
|
if id == "" {
|
|
return fmt.Errorf("Invalid empty id")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// GetSize, return real size, virtual size
|
|
func (container *Container) GetSize() (int64, int64) {
|
|
var (
|
|
sizeRw, sizeRootfs int64
|
|
err error
|
|
driver = container.daemon.driver
|
|
)
|
|
|
|
if err := container.Mount(); err != nil {
|
|
logrus.Errorf("Failed to compute size of container rootfs %s: %s", container.ID, err)
|
|
return sizeRw, sizeRootfs
|
|
}
|
|
defer container.Unmount()
|
|
|
|
initID := fmt.Sprintf("%s-init", container.ID)
|
|
sizeRw, err = driver.DiffSize(container.ID, initID)
|
|
if err != nil {
|
|
logrus.Errorf("Driver %s couldn't return diff size of container %s: %s", driver, container.ID, err)
|
|
// FIXME: GetSize should return an error. Not changing it now in case
|
|
// there is a side-effect.
|
|
sizeRw = -1
|
|
}
|
|
|
|
if _, err = os.Stat(container.basefs); err != nil {
|
|
if sizeRootfs, err = directory.Size(container.basefs); err != nil {
|
|
sizeRootfs = -1
|
|
}
|
|
}
|
|
return sizeRw, sizeRootfs
|
|
}
|
|
|
|
func (container *Container) Copy(resource string) (io.ReadCloser, error) {
|
|
container.Lock()
|
|
defer container.Unlock()
|
|
var err error
|
|
if err := container.Mount(); err != nil {
|
|
return nil, err
|
|
}
|
|
defer func() {
|
|
if err != nil {
|
|
container.Unmount()
|
|
}
|
|
}()
|
|
|
|
if err = container.mountVolumes(); err != nil {
|
|
container.unmountVolumes()
|
|
return nil, err
|
|
}
|
|
defer func() {
|
|
if err != nil {
|
|
container.unmountVolumes()
|
|
}
|
|
}()
|
|
|
|
basePath, err := container.GetResourcePath(resource)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
stat, err := os.Stat(basePath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var filter []string
|
|
if !stat.IsDir() {
|
|
d, f := path.Split(basePath)
|
|
basePath = d
|
|
filter = []string{f}
|
|
} else {
|
|
filter = []string{path.Base(basePath)}
|
|
basePath = path.Dir(basePath)
|
|
}
|
|
|
|
archive, err := archive.TarWithOptions(basePath, &archive.TarOptions{
|
|
Compression: archive.Uncompressed,
|
|
IncludeFiles: filter,
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return ioutils.NewReadCloserWrapper(archive, func() error {
|
|
err := archive.Close()
|
|
container.unmountVolumes()
|
|
container.Unmount()
|
|
return err
|
|
}),
|
|
nil
|
|
}
|
|
|
|
// Returns true if the container exposes a certain port
|
|
func (container *Container) Exposes(p nat.Port) bool {
|
|
_, exists := container.Config.ExposedPorts[p]
|
|
return exists
|
|
}
|
|
|
|
func (container *Container) HostConfig() *runconfig.HostConfig {
|
|
return container.hostConfig
|
|
}
|
|
|
|
func (container *Container) SetHostConfig(hostConfig *runconfig.HostConfig) {
|
|
container.hostConfig = hostConfig
|
|
}
|
|
|
|
func (container *Container) DisableLink(name string) {
|
|
if container.activeLinks != nil {
|
|
if link, exists := container.activeLinks[name]; exists {
|
|
link.Disable()
|
|
} else {
|
|
logrus.Debugf("Could not find active link for %s", name)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (container *Container) setupContainerDns() error {
|
|
if container.ResolvConfPath != "" {
|
|
// check if this is an existing container that needs DNS update:
|
|
if container.UpdateDns {
|
|
// read the host's resolv.conf, get the hash and call updateResolvConf
|
|
logrus.Debugf("Check container (%s) for update to resolv.conf - UpdateDns flag was set", container.ID)
|
|
latestResolvConf, latestHash := resolvconf.GetLastModified()
|
|
|
|
// clean container resolv.conf re: localhost nameservers and IPv6 NS (if IPv6 disabled)
|
|
updatedResolvConf, modified := resolvconf.FilterResolvDns(latestResolvConf, container.daemon.config.Bridge.EnableIPv6)
|
|
if modified {
|
|
// changes have occurred during resolv.conf localhost cleanup: generate an updated hash
|
|
newHash, err := ioutils.HashData(bytes.NewReader(updatedResolvConf))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
latestHash = newHash
|
|
}
|
|
|
|
if err := container.updateResolvConf(updatedResolvConf, latestHash); err != nil {
|
|
return err
|
|
}
|
|
// successful update of the restarting container; set the flag off
|
|
container.UpdateDns = false
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var (
|
|
config = container.hostConfig
|
|
daemon = container.daemon
|
|
)
|
|
|
|
resolvConf, err := resolvconf.Get()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if config.NetworkMode.IsBridge() || config.NetworkMode.IsNone() {
|
|
// check configurations for any container/daemon dns settings
|
|
if len(config.Dns) > 0 || len(daemon.config.Dns) > 0 || len(config.DnsSearch) > 0 || len(daemon.config.DnsSearch) > 0 {
|
|
var (
|
|
dns = resolvconf.GetNameservers(resolvConf)
|
|
dnsSearch = resolvconf.GetSearchDomains(resolvConf)
|
|
)
|
|
if len(config.Dns) > 0 {
|
|
dns = config.Dns
|
|
} else if len(daemon.config.Dns) > 0 {
|
|
dns = daemon.config.Dns
|
|
}
|
|
if len(config.DnsSearch) > 0 {
|
|
dnsSearch = config.DnsSearch
|
|
} else if len(daemon.config.DnsSearch) > 0 {
|
|
dnsSearch = daemon.config.DnsSearch
|
|
}
|
|
return resolvconf.Build(container.ResolvConfPath, dns, dnsSearch)
|
|
}
|
|
|
|
// replace any localhost/127.*, and remove IPv6 nameservers if IPv6 disabled in daemon
|
|
resolvConf, _ = resolvconf.FilterResolvDns(resolvConf, daemon.config.Bridge.EnableIPv6)
|
|
}
|
|
//get a sha256 hash of the resolv conf at this point so we can check
|
|
//for changes when the host resolv.conf changes (e.g. network update)
|
|
resolvHash, err := ioutils.HashData(bytes.NewReader(resolvConf))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
resolvHashFile := container.ResolvConfPath + ".hash"
|
|
if err = ioutil.WriteFile(resolvHashFile, []byte(resolvHash), 0644); err != nil {
|
|
return err
|
|
}
|
|
return ioutil.WriteFile(container.ResolvConfPath, resolvConf, 0644)
|
|
}
|
|
|
|
// called when the host's resolv.conf changes to check whether container's resolv.conf
|
|
// is unchanged by the container "user" since container start: if unchanged, the
|
|
// container's resolv.conf will be updated to match the host's new resolv.conf
|
|
func (container *Container) updateResolvConf(updatedResolvConf []byte, newResolvHash string) error {
|
|
|
|
if container.ResolvConfPath == "" {
|
|
return nil
|
|
}
|
|
if container.Running {
|
|
//set a marker in the hostConfig to update on next start/restart
|
|
container.UpdateDns = true
|
|
return nil
|
|
}
|
|
|
|
resolvHashFile := container.ResolvConfPath + ".hash"
|
|
|
|
//read the container's current resolv.conf and compute the hash
|
|
resolvBytes, err := ioutil.ReadFile(container.ResolvConfPath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
curHash, err := ioutils.HashData(bytes.NewReader(resolvBytes))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//read the hash from the last time we wrote resolv.conf in the container
|
|
hashBytes, err := ioutil.ReadFile(resolvHashFile)
|
|
if err != nil {
|
|
if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
// backwards compat: if no hash file exists, this container pre-existed from
|
|
// a Docker daemon that didn't contain this update feature. Given we can't know
|
|
// if the user has modified the resolv.conf since container start time, safer
|
|
// to just never update the container's resolv.conf during it's lifetime which
|
|
// we can control by setting hashBytes to an empty string
|
|
hashBytes = []byte("")
|
|
}
|
|
|
|
//if the user has not modified the resolv.conf of the container since we wrote it last
|
|
//we will replace it with the updated resolv.conf from the host
|
|
if string(hashBytes) == curHash {
|
|
logrus.Debugf("replacing %q with updated host resolv.conf", container.ResolvConfPath)
|
|
|
|
// for atomic updates to these files, use temporary files with os.Rename:
|
|
dir := path.Dir(container.ResolvConfPath)
|
|
tmpHashFile, err := ioutil.TempFile(dir, "hash")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
tmpResolvFile, err := ioutil.TempFile(dir, "resolv")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// write the updates to the temp files
|
|
if err = ioutil.WriteFile(tmpHashFile.Name(), []byte(newResolvHash), 0644); err != nil {
|
|
return err
|
|
}
|
|
if err = ioutil.WriteFile(tmpResolvFile.Name(), updatedResolvConf, 0644); err != nil {
|
|
return err
|
|
}
|
|
|
|
// rename the temp files for atomic replace
|
|
if err = os.Rename(tmpHashFile.Name(), resolvHashFile); err != nil {
|
|
return err
|
|
}
|
|
return os.Rename(tmpResolvFile.Name(), container.ResolvConfPath)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) updateParentsHosts() error {
|
|
refs := container.daemon.ContainerGraph().RefPaths(container.ID)
|
|
for _, ref := range refs {
|
|
if ref.ParentID == "0" {
|
|
continue
|
|
}
|
|
|
|
c, err := container.daemon.Get(ref.ParentID)
|
|
if err != nil {
|
|
logrus.Error(err)
|
|
}
|
|
|
|
if c != nil && !container.daemon.config.DisableNetwork && container.hostConfig.NetworkMode.IsPrivate() {
|
|
logrus.Debugf("Update /etc/hosts of %s for alias %s with ip %s", c.ID, ref.Name, container.NetworkSettings.IPAddress)
|
|
if err := etchosts.Update(c.HostsPath, container.NetworkSettings.IPAddress, ref.Name); err != nil {
|
|
logrus.Errorf("Failed to update /etc/hosts in parent container %s for alias %s: %v", c.ID, ref.Name, err)
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) initializeNetworking() error {
|
|
var err error
|
|
if container.hostConfig.NetworkMode.IsHost() {
|
|
container.Config.Hostname, err = os.Hostname()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
parts := strings.SplitN(container.Config.Hostname, ".", 2)
|
|
if len(parts) > 1 {
|
|
container.Config.Hostname = parts[0]
|
|
container.Config.Domainname = parts[1]
|
|
}
|
|
|
|
content, err := ioutil.ReadFile("/etc/hosts")
|
|
if os.IsNotExist(err) {
|
|
return container.buildHostnameAndHostsFiles("")
|
|
} else if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := container.buildHostnameFile(); err != nil {
|
|
return err
|
|
}
|
|
|
|
hostsPath, err := container.GetRootResourcePath("hosts")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
container.HostsPath = hostsPath
|
|
|
|
return ioutil.WriteFile(container.HostsPath, content, 0644)
|
|
}
|
|
if container.hostConfig.NetworkMode.IsContainer() {
|
|
// we need to get the hosts files from the container to join
|
|
nc, err := container.getNetworkedContainer()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
container.HostnamePath = nc.HostnamePath
|
|
container.HostsPath = nc.HostsPath
|
|
container.ResolvConfPath = nc.ResolvConfPath
|
|
container.Config.Hostname = nc.Config.Hostname
|
|
container.Config.Domainname = nc.Config.Domainname
|
|
return nil
|
|
}
|
|
if container.daemon.config.DisableNetwork {
|
|
container.Config.NetworkDisabled = true
|
|
return container.buildHostnameAndHostsFiles("127.0.1.1")
|
|
}
|
|
if err := container.AllocateNetwork(); err != nil {
|
|
return err
|
|
}
|
|
return container.buildHostnameAndHostsFiles(container.NetworkSettings.IPAddress)
|
|
}
|
|
|
|
// Make sure the config is compatible with the current kernel
|
|
func (container *Container) verifyDaemonSettings() {
|
|
if container.hostConfig.Memory > 0 && !container.daemon.sysInfo.MemoryLimit {
|
|
logrus.Warnf("Your kernel does not support memory limit capabilities. Limitation discarded.")
|
|
container.hostConfig.Memory = 0
|
|
}
|
|
if container.hostConfig.Memory > 0 && container.hostConfig.MemorySwap != -1 && !container.daemon.sysInfo.SwapLimit {
|
|
logrus.Warnf("Your kernel does not support swap limit capabilities. Limitation discarded.")
|
|
container.hostConfig.MemorySwap = -1
|
|
}
|
|
if container.daemon.sysInfo.IPv4ForwardingDisabled {
|
|
logrus.Warnf("IPv4 forwarding is disabled. Networking will not work")
|
|
}
|
|
}
|
|
|
|
func (container *Container) setupLinkedContainers() ([]string, error) {
|
|
var (
|
|
env []string
|
|
daemon = container.daemon
|
|
)
|
|
children, err := daemon.Children(container.Name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(children) > 0 {
|
|
container.activeLinks = make(map[string]*links.Link, len(children))
|
|
|
|
// If we encounter an error make sure that we rollback any network
|
|
// config and iptables changes
|
|
rollback := func() {
|
|
for _, link := range container.activeLinks {
|
|
link.Disable()
|
|
}
|
|
container.activeLinks = nil
|
|
}
|
|
|
|
for linkAlias, child := range children {
|
|
if !child.IsRunning() {
|
|
return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
|
|
}
|
|
|
|
link, err := links.NewLink(
|
|
container.NetworkSettings.IPAddress,
|
|
child.NetworkSettings.IPAddress,
|
|
linkAlias,
|
|
child.Config.Env,
|
|
child.Config.ExposedPorts,
|
|
)
|
|
|
|
if err != nil {
|
|
rollback()
|
|
return nil, err
|
|
}
|
|
|
|
container.activeLinks[link.Alias()] = link
|
|
if err := link.Enable(); err != nil {
|
|
rollback()
|
|
return nil, err
|
|
}
|
|
|
|
for _, envVar := range link.ToEnv() {
|
|
env = append(env, envVar)
|
|
}
|
|
}
|
|
}
|
|
return env, nil
|
|
}
|
|
|
|
func (container *Container) createDaemonEnvironment(linkedEnv []string) []string {
|
|
// if a domain name was specified, append it to the hostname (see #7851)
|
|
fullHostname := container.Config.Hostname
|
|
if container.Config.Domainname != "" {
|
|
fullHostname = fmt.Sprintf("%s.%s", fullHostname, container.Config.Domainname)
|
|
}
|
|
// Setup environment
|
|
env := []string{
|
|
"PATH=" + DefaultPathEnv,
|
|
"HOSTNAME=" + fullHostname,
|
|
// Note: we don't set HOME here because it'll get autoset intelligently
|
|
// based on the value of USER inside dockerinit, but only if it isn't
|
|
// set already (ie, that can be overridden by setting HOME via -e or ENV
|
|
// in a Dockerfile).
|
|
}
|
|
if container.Config.Tty {
|
|
env = append(env, "TERM=xterm")
|
|
}
|
|
env = append(env, linkedEnv...)
|
|
// because the env on the container can override certain default values
|
|
// we need to replace the 'env' keys where they match and append anything
|
|
// else.
|
|
env = utils.ReplaceOrAppendEnvValues(env, container.Config.Env)
|
|
|
|
return env
|
|
}
|
|
|
|
func (container *Container) setupWorkingDirectory() error {
|
|
if container.Config.WorkingDir != "" {
|
|
container.Config.WorkingDir = path.Clean(container.Config.WorkingDir)
|
|
|
|
pth, err := container.GetResourcePath(container.Config.WorkingDir)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
pthInfo, err := os.Stat(pth)
|
|
if err != nil {
|
|
if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
|
|
if err := os.MkdirAll(pth, 0755); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if pthInfo != nil && !pthInfo.IsDir() {
|
|
return fmt.Errorf("Cannot mkdir: %s is not a directory", container.Config.WorkingDir)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) startLogging() error {
|
|
cfg := container.hostConfig.LogConfig
|
|
if cfg.Type == "" {
|
|
cfg = container.daemon.defaultLogConfig
|
|
}
|
|
var l logger.Logger
|
|
switch cfg.Type {
|
|
case "json-file":
|
|
pth, err := container.logPath("json")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
container.LogPath = pth
|
|
|
|
dl, err := jsonfilelog.New(pth)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
l = dl
|
|
case "syslog":
|
|
dl, err := syslog.New(container.ID[:12])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
l = dl
|
|
case "journald":
|
|
dl, err := journald.New(container.ID, container.Name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
l = dl
|
|
case "none":
|
|
return nil
|
|
default:
|
|
return fmt.Errorf("Unknown logging driver: %s", cfg.Type)
|
|
}
|
|
|
|
copier, err := logger.NewCopier(container.ID, map[string]io.Reader{"stdout": container.StdoutPipe(), "stderr": container.StderrPipe()}, l)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
container.logCopier = copier
|
|
copier.Run()
|
|
container.logDriver = l
|
|
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) waitForStart() error {
|
|
container.monitor = newContainerMonitor(container, container.hostConfig.RestartPolicy)
|
|
|
|
// block until we either receive an error from the initial start of the container's
|
|
// process or until the process is running in the container
|
|
select {
|
|
case <-container.monitor.startSignal:
|
|
case err := <-promise.Go(container.monitor.Start):
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) allocatePort(port nat.Port, bindings nat.PortMap) error {
|
|
binding := bindings[port]
|
|
if container.hostConfig.PublishAllPorts && len(binding) == 0 {
|
|
binding = append(binding, nat.PortBinding{})
|
|
}
|
|
|
|
for i := 0; i < len(binding); i++ {
|
|
b, err := bridge.AllocatePort(container.ID, port, binding[i])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
binding[i] = b
|
|
}
|
|
bindings[port] = binding
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) GetProcessLabel() string {
|
|
// even if we have a process label return "" if we are running
|
|
// in privileged mode
|
|
if container.hostConfig.Privileged {
|
|
return ""
|
|
}
|
|
return container.ProcessLabel
|
|
}
|
|
|
|
func (container *Container) GetMountLabel() string {
|
|
if container.hostConfig.Privileged {
|
|
return ""
|
|
}
|
|
return container.MountLabel
|
|
}
|
|
|
|
func (container *Container) getIpcContainer() (*Container, error) {
|
|
containerID := container.hostConfig.IpcMode.Container()
|
|
c, err := container.daemon.Get(containerID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if !c.IsRunning() {
|
|
return nil, fmt.Errorf("cannot join IPC of a non running container: %s", containerID)
|
|
}
|
|
return c, nil
|
|
}
|
|
|
|
func (container *Container) getNetworkedContainer() (*Container, error) {
|
|
parts := strings.SplitN(string(container.hostConfig.NetworkMode), ":", 2)
|
|
switch parts[0] {
|
|
case "container":
|
|
if len(parts) != 2 {
|
|
return nil, fmt.Errorf("no container specified to join network")
|
|
}
|
|
nc, err := container.daemon.Get(parts[1])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if container == nc {
|
|
return nil, fmt.Errorf("cannot join own network")
|
|
}
|
|
if !nc.IsRunning() {
|
|
return nil, fmt.Errorf("cannot join network of a non running container: %s", parts[1])
|
|
}
|
|
return nc, nil
|
|
default:
|
|
return nil, fmt.Errorf("network mode not set to container")
|
|
}
|
|
}
|
|
|
|
func (container *Container) Stats() (*execdriver.ResourceStats, error) {
|
|
return container.daemon.Stats(container)
|
|
}
|
|
|
|
func (c *Container) LogDriverType() string {
|
|
c.Lock()
|
|
defer c.Unlock()
|
|
if c.hostConfig.LogConfig.Type == "" {
|
|
return c.daemon.defaultLogConfig.Type
|
|
}
|
|
return c.hostConfig.LogConfig.Type
|
|
}
|
|
|
|
func (container *Container) GetExecIDs() []string {
|
|
return container.execCommands.List()
|
|
}
|
|
|
|
func (container *Container) Exec(execConfig *execConfig) error {
|
|
container.Lock()
|
|
defer container.Unlock()
|
|
|
|
waitStart := make(chan struct{})
|
|
|
|
callback := func(processConfig *execdriver.ProcessConfig, pid int) {
|
|
if processConfig.Tty {
|
|
// The callback is called after the process Start()
|
|
// so we are in the parent process. In TTY mode, stdin/out/err is the PtySlave
|
|
// which we close here.
|
|
if c, ok := processConfig.Stdout.(io.Closer); ok {
|
|
c.Close()
|
|
}
|
|
}
|
|
close(waitStart)
|
|
}
|
|
|
|
// We use a callback here instead of a goroutine and an chan for
|
|
// syncronization purposes
|
|
cErr := promise.Go(func() error { return container.monitorExec(execConfig, callback) })
|
|
|
|
// Exec should not return until the process is actually running
|
|
select {
|
|
case <-waitStart:
|
|
case err := <-cErr:
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) monitorExec(execConfig *execConfig, callback execdriver.StartCallback) error {
|
|
var (
|
|
err error
|
|
exitCode int
|
|
)
|
|
|
|
pipes := execdriver.NewPipes(execConfig.StreamConfig.stdin, execConfig.StreamConfig.stdout, execConfig.StreamConfig.stderr, execConfig.OpenStdin)
|
|
exitCode, err = container.daemon.Exec(container, execConfig, pipes, callback)
|
|
if err != nil {
|
|
logrus.Errorf("Error running command in existing container %s: %s", container.ID, err)
|
|
}
|
|
|
|
logrus.Debugf("Exec task in container %s exited with code %d", container.ID, exitCode)
|
|
if execConfig.OpenStdin {
|
|
if err := execConfig.StreamConfig.stdin.Close(); err != nil {
|
|
logrus.Errorf("Error closing stdin while running in %s: %s", container.ID, err)
|
|
}
|
|
}
|
|
if err := execConfig.StreamConfig.stdout.Clean(); err != nil {
|
|
logrus.Errorf("Error closing stdout while running in %s: %s", container.ID, err)
|
|
}
|
|
if err := execConfig.StreamConfig.stderr.Clean(); err != nil {
|
|
logrus.Errorf("Error closing stderr while running in %s: %s", container.ID, err)
|
|
}
|
|
if execConfig.ProcessConfig.Terminal != nil {
|
|
if err := execConfig.ProcessConfig.Terminal.Close(); err != nil {
|
|
logrus.Errorf("Error closing terminal while running in container %s: %s", container.ID, err)
|
|
}
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
func (c *Container) Attach(stdin io.ReadCloser, stdout io.Writer, stderr io.Writer) chan error {
|
|
return attach(&c.StreamConfig, c.Config.OpenStdin, c.Config.StdinOnce, c.Config.Tty, stdin, stdout, stderr)
|
|
}
|
|
|
|
func (c *Container) AttachWithLogs(stdin io.ReadCloser, stdout, stderr io.Writer, logs, stream bool) error {
|
|
if logs {
|
|
cLog, err := c.ReadLog("json")
|
|
if err != nil && os.IsNotExist(err) {
|
|
// Legacy logs
|
|
logrus.Debugf("Old logs format")
|
|
if stdout != nil {
|
|
cLog, err := c.ReadLog("stdout")
|
|
if err != nil {
|
|
logrus.Errorf("Error reading logs (stdout): %s", err)
|
|
} else if _, err := io.Copy(stdout, cLog); err != nil {
|
|
logrus.Errorf("Error streaming logs (stdout): %s", err)
|
|
}
|
|
}
|
|
if stderr != nil {
|
|
cLog, err := c.ReadLog("stderr")
|
|
if err != nil {
|
|
logrus.Errorf("Error reading logs (stderr): %s", err)
|
|
} else if _, err := io.Copy(stderr, cLog); err != nil {
|
|
logrus.Errorf("Error streaming logs (stderr): %s", err)
|
|
}
|
|
}
|
|
} else if err != nil {
|
|
logrus.Errorf("Error reading logs (json): %s", err)
|
|
} else {
|
|
dec := json.NewDecoder(cLog)
|
|
for {
|
|
l := &jsonlog.JSONLog{}
|
|
|
|
if err := dec.Decode(l); err == io.EOF {
|
|
break
|
|
} else if err != nil {
|
|
logrus.Errorf("Error streaming logs: %s", err)
|
|
break
|
|
}
|
|
if l.Stream == "stdout" && stdout != nil {
|
|
io.WriteString(stdout, l.Log)
|
|
}
|
|
if l.Stream == "stderr" && stderr != nil {
|
|
io.WriteString(stderr, l.Log)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//stream
|
|
if stream {
|
|
var stdinPipe io.ReadCloser
|
|
if stdin != nil {
|
|
r, w := io.Pipe()
|
|
go func() {
|
|
defer w.Close()
|
|
defer logrus.Debugf("Closing buffered stdin pipe")
|
|
io.Copy(w, stdin)
|
|
}()
|
|
stdinPipe = r
|
|
}
|
|
<-c.Attach(stdinPipe, stdout, stderr)
|
|
// If we are in stdinonce mode, wait for the process to end
|
|
// otherwise, simply return
|
|
if c.Config.StdinOnce && !c.Config.Tty {
|
|
c.WaitStop(-1 * time.Second)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func attach(streamConfig *StreamConfig, openStdin, stdinOnce, tty bool, stdin io.ReadCloser, stdout io.Writer, stderr io.Writer) chan error {
|
|
var (
|
|
cStdout, cStderr io.ReadCloser
|
|
cStdin io.WriteCloser
|
|
wg sync.WaitGroup
|
|
errors = make(chan error, 3)
|
|
)
|
|
|
|
if stdin != nil && openStdin {
|
|
cStdin = streamConfig.StdinPipe()
|
|
wg.Add(1)
|
|
}
|
|
|
|
if stdout != nil {
|
|
cStdout = streamConfig.StdoutPipe()
|
|
wg.Add(1)
|
|
}
|
|
|
|
if stderr != nil {
|
|
cStderr = streamConfig.StderrPipe()
|
|
wg.Add(1)
|
|
}
|
|
|
|
// Connect stdin of container to the http conn.
|
|
go func() {
|
|
if stdin == nil || !openStdin {
|
|
return
|
|
}
|
|
logrus.Debugf("attach: stdin: begin")
|
|
defer func() {
|
|
if stdinOnce && !tty {
|
|
cStdin.Close()
|
|
} else {
|
|
// No matter what, when stdin is closed (io.Copy unblock), close stdout and stderr
|
|
if cStdout != nil {
|
|
cStdout.Close()
|
|
}
|
|
if cStderr != nil {
|
|
cStderr.Close()
|
|
}
|
|
}
|
|
wg.Done()
|
|
logrus.Debugf("attach: stdin: end")
|
|
}()
|
|
|
|
var err error
|
|
if tty {
|
|
_, err = copyEscapable(cStdin, stdin)
|
|
} else {
|
|
_, err = io.Copy(cStdin, stdin)
|
|
|
|
}
|
|
if err == io.ErrClosedPipe {
|
|
err = nil
|
|
}
|
|
if err != nil {
|
|
logrus.Errorf("attach: stdin: %s", err)
|
|
errors <- err
|
|
return
|
|
}
|
|
}()
|
|
|
|
attachStream := func(name string, stream io.Writer, streamPipe io.ReadCloser) {
|
|
if stream == nil {
|
|
return
|
|
}
|
|
defer func() {
|
|
// Make sure stdin gets closed
|
|
if stdin != nil {
|
|
stdin.Close()
|
|
}
|
|
streamPipe.Close()
|
|
wg.Done()
|
|
logrus.Debugf("attach: %s: end", name)
|
|
}()
|
|
|
|
logrus.Debugf("attach: %s: begin", name)
|
|
_, err := io.Copy(stream, streamPipe)
|
|
if err == io.ErrClosedPipe {
|
|
err = nil
|
|
}
|
|
if err != nil {
|
|
logrus.Errorf("attach: %s: %v", name, err)
|
|
errors <- err
|
|
}
|
|
}
|
|
|
|
go attachStream("stdout", stdout, cStdout)
|
|
go attachStream("stderr", stderr, cStderr)
|
|
|
|
return promise.Go(func() error {
|
|
wg.Wait()
|
|
close(errors)
|
|
for err := range errors {
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
})
|
|
}
|
|
|
|
// Code c/c from io.Copy() modified to handle escape sequence
|
|
func copyEscapable(dst io.Writer, src io.ReadCloser) (written int64, err error) {
|
|
buf := make([]byte, 32*1024)
|
|
for {
|
|
nr, er := src.Read(buf)
|
|
if nr > 0 {
|
|
// ---- Docker addition
|
|
// char 16 is C-p
|
|
if nr == 1 && buf[0] == 16 {
|
|
nr, er = src.Read(buf)
|
|
// char 17 is C-q
|
|
if nr == 1 && buf[0] == 17 {
|
|
if err := src.Close(); err != nil {
|
|
return 0, err
|
|
}
|
|
return 0, nil
|
|
}
|
|
}
|
|
// ---- End of docker
|
|
nw, ew := dst.Write(buf[0:nr])
|
|
if nw > 0 {
|
|
written += int64(nw)
|
|
}
|
|
if ew != nil {
|
|
err = ew
|
|
break
|
|
}
|
|
if nr != nw {
|
|
err = io.ErrShortWrite
|
|
break
|
|
}
|
|
}
|
|
if er == io.EOF {
|
|
break
|
|
}
|
|
if er != nil {
|
|
err = er
|
|
break
|
|
}
|
|
}
|
|
return written, err
|
|
}
|