Require listen address and advertise address to be an IP address or an interface name

Hostnames are not supported for now because libnetwork can't use them
for overlay networking yet.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

docs/reference/commandline/swarm_init.md

@@ -17,13 +17,13 @@ Usage:  docker swarm init [OPTIONS]
 Initialize a swarm
 
 Options:
-      --advertise-addr value            Advertised address (format: <ip|hostname|interface>[:port])
+      --advertise-addr value            Advertised address (format: <ip|interface>[:port])
       --cert-expiry duration            Validity period for node certificates (default 2160h0m0s)
       --dispatcher-heartbeat duration   Dispatcher heartbeat period (default 5s)
       --external-ca value               Specifications of one or more certificate signing endpoints
       --force-new-cluster               Force create a new cluster from current state.
       --help                            Print usage
-      --listen-addr value               Listen address (format: <ip|hostname|interface>[:port])
+      --listen-addr value               Listen address (format: <ip|interface>[:port])
       --task-history-limit int          Task history retention limit (default 5)
 ```
 
@@ -79,7 +79,7 @@ The node listens for inbound Swarm manager traffic on this address. The default
 0.0.0.0:2377. It is also possible to specify a network interface to listen on that interface's
 address; for example `--listen-addr eth0:2377`.
 
-Specifying a port is optional. If the value is a bare IP address, hostname, or interface
+Specifying a port is optional. If the value is a bare IP address or interface
 name, the default port 2377 will be used.
 
 ### `--advertise-addr value`
@@ -94,7 +94,7 @@ inter-manager communication and overlay networking.
 It is also possible to specify a network interface to advertise that interface's address;
 for example `--advertise-addr eth0:2377`.
 
-Specifying a port is optional. If the value is a bare IP address, hostname, or interface
+Specifying a port is optional. If the value is a bare IP address or interface
 name, the default port 2377 will be used.
 
 ### `--task-history-limit`

docs/reference/commandline/swarm_join.md

@@ -17,9 +17,9 @@ Usage:  docker swarm join [OPTIONS] HOST:PORT
 Join a swarm as a node and/or manager
 
 Options:
-      --advertise-addr value   Advertised address (format: <ip|hostname|interface>[:port])
+      --advertise-addr value   Advertised address (format: <ip|interface>[:port])
       --help                   Print usage
-      --listen-addr value      Listen address
+      --listen-addr value      Listen address (format: <ip|interface>[:port)
       --token string           Token for entry into the swarm
 ```
 
@@ -64,7 +64,7 @@ If the node is a manager, it will listen for inbound Swarm manager traffic on th
 address. The default is to listen on 0.0.0.0:2377. It is also possible to specify a
 network interface to listen on that interface's address; for example `--listen-addr eth0:2377`.
 
-Specifying a port is optional. If the value is a bare IP address, hostname, or interface
+Specifying a port is optional. If the value is a bare IP address, or interface
 name, the default port 2377 will be used.
 
 This flag is generally not necessary when joining an existing swarm.
@@ -81,7 +81,7 @@ communication and overlay networking.
 It is also possible to specify a network interface to advertise that interface's address;
 for example `--advertise-addr eth0:2377`.
 
-Specifying a port is optional. If the value is a bare IP address, hostname, or interface
+Specifying a port is optional. If the value is a bare IP address, or interface
 name, the default port 2377 will be used.
 
 This flag is generally not necessary when joining an existing swarm.

man/dockerd.8.md

@@ -55,7 +55,7 @@ dockerd - Enable daemon mode
 [**-s**|**--storage-driver**[=*STORAGE-DRIVER*]]
 [**--selinux-enabled**]
 [**--storage-opt**[=*[]*]]
-[**--swarm-default-advertise-addr**[=*IP|HOSTNAME|INTERFACE*]]
+[**--swarm-default-advertise-addr**[=*IP|INTERFACE*]]
 [**--tls**]
 [**--tlscacert**[=*~/.docker/ca.pem*]]
 [**--tlscert**[=*~/.docker/cert.pem*]]
@@ -240,7 +240,7 @@ output otherwise.
 **--storage-opt**=[]
   Set storage driver options. See STORAGE DRIVER OPTIONS.
 
-**--swarm-default-advertise-addr**=*IP|HOSTNAME|INTERFACE*
+**--swarm-default-advertise-addr**=*IP|INTERFACE*
   Set default address or interface for swarm to advertise as its externally-reachable address to other cluster
   members. This can be a hostname, an IP address, or an interface such as `eth0`. A port cannot be specified with
   this option.