Connect a container to a network
docker network connect [OPTIONS] NETWORK CONTAINER
| ||Add network-scoped alias for the container|
| ||driver options for the network|
| ||IPv4 address (e.g., 172.30.100.104)|
| ||IPv6 address (e.g., 2001:db8::33)|
| ||Add link to another container|
| ||Add a link-local address for the container|
|docker network||Manage networks|
|docker network connect||Connect a container to a network|
|docker network create||Create a network|
|docker network disconnect||Disconnect a container from a network|
|docker network inspect||Display detailed information on one or more networks|
|docker network ls||List networks|
|docker network prune||Remove all unused networks|
|docker network rm||Remove one or more networks|
Connects a container to a network. You can connect a container by name or by ID. Once connected, the container can communicate with other containers in the same network.
$ docker network connect multi-host-network container1
You can also use the
docker run --network=<network-name> option to start a container and immediately connect it to a network.
$ docker run -itd --network=multi-host-network busybox
You can specify the IP address you want to be assigned to the container’s interface.
$ docker network connect --ip 10.10.36.122 multi-host-network container2
You can use
--link option to link another container with a preferred alias
$ docker network connect --link container1:c1 multi-host-network container2
--alias option can be used to resolve the container by another name in the network being connected to.
$ docker network connect --alias db --alias mysql multi-host-network container2
You can pause, restart, and stop containers that are connected to a network. A container connects to its configured networks when it runs.
If specified, the container’s IP address(es) is reapplied when a stopped container is restarted. If the IP address is no longer available, the container fails to start. One way to guarantee that the IP address is available is to specify an
--ip-range when creating the network, and choose the static IP address(es) from outside that range. This ensures that the IP address is not given to another container while this container is not on the network.
$ docker network create --subnet 172.20.0.0/16 --ip-range 172.20.240.0/20 multi-host-network
$ docker network connect --ip 172.20.128.2 multi-host-network container2
To verify the container is connected, use the
docker network inspect command. Use
docker network disconnect to remove a container from the network.
Once connected in network, containers can communicate using only another container’s IP address or name. For
overlay networks or custom plugins that support multi-host connectivity, containers connected to the same multi-host network but launched from different Engines can also communicate in this way.
You can connect a container to one or more networks. The networks need not be the same type. For example, you can connect a single container bridge and overlay networks.
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