3.7 KiB
Networking
Docker Swarm is fully compatible for the new networking model added in docker 1.9
Setup
To use multi-host networking you need to start your docker engines with
--cluster-store and --cluster-advertise as indicated in the docker
engine docs.
List networks
This example assumes there are two nodes node-0 and node-1 in the cluster.
$ docker networks ls
NETWORK ID NAME DRIVER
3dd50db9706d node-0/host host
09138343e80e node-0/bridge bridge
8834dbd552e5 node-0/none null
45782acfe427 node-1/host host
8926accb25fd node-1/bridge bridge
6382abccd23d node-1/none null
As you can see, each network name is prefixed by the node name.
Create a network
By default, swarm is using the overlay network driver, a global
scope driver.
$ docker network create swarm_network
42131321acab3233ba342443Ba4312
$ docker networks ls
NETWORK ID NAME DRIVER
3dd50db9706d node-0/host host
09138343e80e node-0/bridge bridge
8834dbd552e5 node-0/none null
42131321acab node-0/swarm_network overlay
45782acfe427 node-1/host host
8926accb25fd node-1/bridge bridge
6382abccd23d node-1/none null
42131321acab node-1/swarm_network overlay
As you can see here, the ID is the same on the two nodes, because it's the same network.
If you want to want to create a local scope network (for example with the bridge
driver) you should use <node>/<name> otherwise your network will be created on a
random node.
$ docker network create node-0/bridge2 -b bridge
921817fefea521673217123abab223
$ docker network create node-1/bridge2 -b bridge
5262bbfe5616fef6627771289aacc2
$ docker networks ls
NETWORK ID NAME DRIVER
3dd50db9706d node-0/host host
09138343e80e node-0/bridge bridge
8834dbd552e5 node-0/none null
42131321acab node-0/swarm_network overlay
921817fefea5 node-0/bridge2 brige
45782acfe427 node-1/host host
8926accb25fd node-1/bridge bridge
6382abccd23d node-1/none null
42131321acab node-1/swarm_network overlay
5262bbfe5616 node-1/bridge2 bridge
Remove a network
To remove a network you can use its ID or its name.
If two different network have the same name, use may use <node>/<name>.
$ docker network rm swarm_network
42131321acab3233ba342443Ba4312
$ docker network rm node-0/bridge2
921817fefea521673217123abab223
$ docker networks ls
NETWORK ID NAME DRIVER
3dd50db9706d node-0/host host
09138343e80e node-0/bridge bridge
8834dbd552e5 node-0/none null
45782acfe427 node-1/host host
8926accb25fd node-1/bridge bridge
6382abccd23d node-1/none null
5262bbfe5616 node-1/bridge2 bridge
swarm_network was removed from every node, bridge2 was removed only
from node-0.