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118 lines
4.1 KiB
Markdown
118 lines
4.1 KiB
Markdown
---
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title: "network connect"
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description: "The network connect command description and usage"
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keywords: "network, connect, user-defined"
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---
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# network connect
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```markdown
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Usage: docker network connect [OPTIONS] NETWORK CONTAINER
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Connect a container to a network
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Options:
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--alias value Add network-scoped alias for the container (default [])
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--help Print usage
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--ip string IPv4 address (e.g., 172.30.100.104)
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--ip6 string IPv6 address (e.g., 2001:db8::33)
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--link value Add link to another container (default [])
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--link-local-ip value Add a link-local address for the container (default [])
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```
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## Description
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Connects a container to a network. You can connect a container by name
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or by ID. Once connected, the container can communicate with other containers in
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the same network.
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## Examples
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### Connect a running container to a network
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```bash
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$ docker network connect multi-host-network container1
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```
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### Connect a container to a network when it starts
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You can also use the `docker run --network=<network-name>` option to start a container and immediately connect it to a network.
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```bash
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$ docker run -itd --network=multi-host-network busybox
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```
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### Specify the IP address a container will use on a given network
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You can specify the IP address you want to be assigned to the container's interface.
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```bash
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$ docker network connect --ip 10.10.36.122 multi-host-network container2
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```
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### Use the legacy `--link` option
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You can use `--link` option to link another container with a preferred alias
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```bash
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$ docker network connect --link container1:c1 multi-host-network container2
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```
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### Create a network alias for a container
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`--alias` option can be used to resolve the container by another name in the network
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being connected to.
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```bash
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$ docker network connect --alias db --alias mysql multi-host-network container2
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```
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### Network implications of stopping, pausing, or restarting containers
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You can pause, restart, and stop containers that are connected to a network.
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A container connects to its configured networks when it runs.
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If specified, the container's IP address(es) is reapplied when a stopped
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container is restarted. If the IP address is no longer available, the container
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fails to start. One way to guarantee that the IP address is available is
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to specify an `--ip-range` when creating the network, and choose the static IP
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address(es) from outside that range. This ensures that the IP address is not
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given to another container while this container is not on the network.
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```bash
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$ docker network create --subnet 172.20.0.0/16 --ip-range 172.20.240.0/20 multi-host-network
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```
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```bash
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$ docker network connect --ip 172.20.128.2 multi-host-network container2
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```
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To verify the container is connected, use the `docker network inspect` command. Use `docker network disconnect` to remove a container from the network.
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Once connected in network, containers can communicate using only another
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container's IP address or name. For `overlay` networks or custom plugins that
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support multi-host connectivity, containers connected to the same multi-host
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network but launched from different Engines can also communicate in this way.
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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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## Related commands
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* [network inspect](network_inspect.md)
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* [network create](network_create.md)
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* [network disconnect](network_disconnect.md)
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* [network ls](network_ls.md)
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* [network rm](network_rm.md)
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* [network prune](network_prune.md)
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* [Understand Docker container networks](https://docs.docker.com/network/)
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* [Work with networks](https://docs.docker.com/network/bridge/)
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