DockerCLI/man/docker-network-connect.1.md

2.4 KiB

% DOCKER(1) Docker User Manuals % Docker Community % OCT 2015

NAME

docker-network-connect - connect a container to a network

SYNOPSIS

docker network connect [--help] NETWORK CONTAINER

DESCRIPTION

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 --net=<network-name> option to start a container and immediately connect it to a network.

$ docker run -itd --net=multi-host-network --ip 172.20.88.22 --ip6 2001:db8::8822 busybox

You can pause, restart, and stop containers that are connected to a network. Paused containers remain connected and can be revealed by a network inspect. When the container is stopped, it does not appear on the network until you restart it. If specified, the container's IP address(es) will be reapplied (if still available) when a stopped container rejoins the network. One way to guarantee that the container will be assigned the same IP addresses when it rejoins the network after a stop or a disconnect, is to specify the --ip-range when creating the network, and choose the static IP address(es) from outside the range. This will ensure that the IP address will not be given to other dynamic containers 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.

OPTIONS

NETWORK Specify network name

CONTAINER Specify container name

--help Print usage statement

HISTORY

OCT 2015, created by Mary Anthony mary@docker.com