docker/daemon/create.go

261 строка
7.8 KiB
Go

package daemon
import (
"fmt"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/container"
"github.com/docker/docker/errors"
"github.com/docker/docker/image"
"github.com/docker/docker/layer"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/runconfig"
volumestore "github.com/docker/docker/volume/store"
"github.com/docker/engine-api/types"
containertypes "github.com/docker/engine-api/types/container"
networktypes "github.com/docker/engine-api/types/network"
"github.com/opencontainers/runc/libcontainer/label"
)
// CreateManagedContainer creates a container that is managed by a Service
func (daemon *Daemon) CreateManagedContainer(params types.ContainerCreateConfig, validateHostname bool) (types.ContainerCreateResponse, error) {
return daemon.containerCreate(params, true, validateHostname)
}
// ContainerCreate creates a regular container
func (daemon *Daemon) ContainerCreate(params types.ContainerCreateConfig, validateHostname bool) (types.ContainerCreateResponse, error) {
return daemon.containerCreate(params, false, validateHostname)
}
func (daemon *Daemon) containerCreate(params types.ContainerCreateConfig, managed bool, validateHostname bool) (types.ContainerCreateResponse, error) {
if params.Config == nil {
return types.ContainerCreateResponse{}, fmt.Errorf("Config cannot be empty in order to create a container")
}
warnings, err := daemon.verifyContainerSettings(params.HostConfig, params.Config, false, validateHostname)
if err != nil {
return types.ContainerCreateResponse{Warnings: warnings}, err
}
err = daemon.verifyNetworkingConfig(params.NetworkingConfig)
if err != nil {
return types.ContainerCreateResponse{}, err
}
if params.HostConfig == nil {
params.HostConfig = &containertypes.HostConfig{}
}
err = daemon.adaptContainerSettings(params.HostConfig, params.AdjustCPUShares)
if err != nil {
return types.ContainerCreateResponse{Warnings: warnings}, err
}
container, err := daemon.create(params, managed)
if err != nil {
return types.ContainerCreateResponse{Warnings: warnings}, daemon.imageNotExistToErrcode(err)
}
return types.ContainerCreateResponse{ID: container.ID, Warnings: warnings}, nil
}
// Create creates a new container from the given configuration with a given name.
func (daemon *Daemon) create(params types.ContainerCreateConfig, managed bool) (retC *container.Container, retErr error) {
var (
container *container.Container
img *image.Image
imgID image.ID
err error
)
if params.Config.Image != "" {
img, err = daemon.GetImage(params.Config.Image)
if err != nil {
return nil, err
}
imgID = img.ID()
}
if err := daemon.mergeAndVerifyConfig(params.Config, img); err != nil {
return nil, err
}
if err := daemon.mergeAndVerifyLogConfig(&params.HostConfig.LogConfig); err != nil {
return nil, err
}
if container, err = daemon.newContainer(params.Name, params.Config, imgID, managed); err != nil {
return nil, err
}
defer func() {
if retErr != nil {
if err := daemon.cleanupContainer(container, true); err != nil {
logrus.Errorf("failed to cleanup container on create error: %v", err)
}
}
}()
if err := daemon.setSecurityOptions(container, params.HostConfig); err != nil {
return nil, err
}
container.HostConfig.StorageOpt = params.HostConfig.StorageOpt
// Set RWLayer for container after mount labels have been set
if err := daemon.setRWLayer(container); err != nil {
return nil, err
}
rootUID, rootGID, err := idtools.GetRootUIDGID(daemon.uidMaps, daemon.gidMaps)
if err != nil {
return nil, err
}
if err := idtools.MkdirAs(container.Root, 0700, rootUID, rootGID); err != nil {
return nil, err
}
if err := daemon.setHostConfig(container, params.HostConfig); err != nil {
return nil, err
}
defer func() {
if retErr != nil {
if err := daemon.removeMountPoints(container, true); err != nil {
logrus.Error(err)
}
}
}()
if err := daemon.createContainerPlatformSpecificSettings(container, params.Config, params.HostConfig); err != nil {
return nil, err
}
var endpointsConfigs map[string]*networktypes.EndpointSettings
if params.NetworkingConfig != nil {
endpointsConfigs = params.NetworkingConfig.EndpointsConfig
}
// Make sure NetworkMode has an acceptable value. We do this to ensure
// backwards API compatibility.
container.HostConfig = runconfig.SetDefaultNetModeIfBlank(container.HostConfig)
if err := daemon.updateContainerNetworkSettings(container, endpointsConfigs); err != nil {
return nil, err
}
if err := container.ToDisk(); err != nil {
logrus.Errorf("Error saving new container to disk: %v", err)
return nil, err
}
if err := daemon.Register(container); err != nil {
return nil, err
}
daemon.LogContainerEvent(container, "create")
return container, nil
}
func (daemon *Daemon) generateSecurityOpt(ipcMode containertypes.IpcMode, pidMode containertypes.PidMode, privileged bool) ([]string, error) {
if ipcMode.IsHost() || pidMode.IsHost() || privileged {
return label.DisableSecOpt(), nil
}
var ipcLabel []string
var pidLabel []string
ipcContainer := ipcMode.Container()
pidContainer := pidMode.Container()
if ipcContainer != "" {
c, err := daemon.GetContainer(ipcContainer)
if err != nil {
return nil, err
}
ipcLabel = label.DupSecOpt(c.ProcessLabel)
if pidContainer == "" {
return ipcLabel, err
}
}
if pidContainer != "" {
c, err := daemon.GetContainer(pidContainer)
if err != nil {
return nil, err
}
pidLabel = label.DupSecOpt(c.ProcessLabel)
if ipcContainer == "" {
return pidLabel, err
}
}
if pidLabel != nil && ipcLabel != nil {
for i := 0; i < len(pidLabel); i++ {
if pidLabel[i] != ipcLabel[i] {
return nil, fmt.Errorf("--ipc and --pid containers SELinux labels aren't the same")
}
}
return pidLabel, nil
}
return nil, nil
}
func (daemon *Daemon) setRWLayer(container *container.Container) error {
var layerID layer.ChainID
if container.ImageID != "" {
img, err := daemon.imageStore.Get(container.ImageID)
if err != nil {
return err
}
layerID = img.RootFS.ChainID()
}
rwLayer, err := daemon.layerStore.CreateRWLayer(container.ID, layerID, container.MountLabel, daemon.setupInitLayer, container.HostConfig.StorageOpt)
if err != nil {
return err
}
container.RWLayer = rwLayer
return nil
}
// VolumeCreate creates a volume with the specified name, driver, and opts
// This is called directly from the remote API
func (daemon *Daemon) VolumeCreate(name, driverName string, opts, labels map[string]string) (*types.Volume, error) {
if name == "" {
name = stringid.GenerateNonCryptoID()
}
v, err := daemon.volumes.Create(name, driverName, opts, labels)
if err != nil {
if volumestore.IsNameConflict(err) {
return nil, fmt.Errorf("A volume named %s already exists. Choose a different volume name.", name)
}
return nil, err
}
daemon.LogVolumeEvent(v.Name(), "create", map[string]string{"driver": v.DriverName()})
apiV := volumeToAPIType(v)
apiV.Mountpoint = v.Path()
return apiV, nil
}
func (daemon *Daemon) mergeAndVerifyConfig(config *containertypes.Config, img *image.Image) error {
if img != nil && img.Config != nil {
if err := merge(config, img.Config); err != nil {
return err
}
}
if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 {
return fmt.Errorf("No command specified")
}
return nil
}
// Checks if the client set configurations for more than one network while creating a container
func (daemon *Daemon) verifyNetworkingConfig(nwConfig *networktypes.NetworkingConfig) error {
if nwConfig == nil || len(nwConfig.EndpointsConfig) <= 1 {
return nil
}
l := make([]string, 0, len(nwConfig.EndpointsConfig))
for k := range nwConfig.EndpointsConfig {
l = append(l, k)
}
err := fmt.Errorf("Container cannot be connected to network endpoints: %s", strings.Join(l, ", "))
return errors.NewBadRequestError(err)
}