docker network createEstimated reading time: 7 minutes
Create a network
docker network create [OPTIONS] NETWORK
||Enable manual container attachment|
||Auxiliary IPv4 or IPv6 addresses used by Network driver|
||Driver to manage the Network|
||IPv4 or IPv6 Gateway for the master subnet|
||Restrict external access to the network|
||Allocate container ip from a sub-range|
||IP Address Management Driver|
||Set IPAM driver specific options|
||Enable IPv6 networking|
||Set metadata on a network|
||Set driver specific options|
||Subnet in CIDR format that represents a network segment|
|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|
Creates a new network. The
overlay which are the
built-in network drivers. If you have installed a third party or your own custom
network driver you can specify that
DRIVER here also. If you don’t specify the
--driver option, the command automatically creates a
bridge network for you.
When you install Docker Engine it creates a
bridge network automatically. This
network corresponds to the
docker0 bridge that Engine has traditionally relied
on. When you launch a new container with
docker run it automatically connects to
this bridge network. You cannot remove this default bridge network, but you can
create new ones using the
network create command.
$ docker network create -d bridge my-bridge-network
Bridge networks are isolated networks on a single Engine installation. If you
want to create a network that spans multiple Docker hosts each running an
Engine, you must create an
overlay network. Unlike
bridge networks, overlay
networks require some pre-existing conditions before you can create one. These
- Access to a key-value store. Engine supports Consul, Etcd, and ZooKeeper (Distributed store) key-value stores.
- A cluster of hosts with connectivity to the key-value store.
- A properly configured Engine
daemonon each host in the cluster.
dockerd options that support the
overlay network are:
To read more about these options and how to configure them, see “Get started with multi-host network”.
While not required, it is a good idea to install Docker Swarm to manage the cluster that makes up your network. Swarm provides sophisticated discovery and server management tools that can assist your implementation.
Once you have prepared the
overlay network prerequisites you simply choose a
Docker host in the cluster and issue the following to create the network:
$ docker network create -d overlay my-multihost-network
Network names must be unique. The Docker daemon attempts to identify naming conflicts but this is not guaranteed. It is the user’s responsibility to avoid name conflicts.
When you start a container, use the
--network flag to connect it to a network.
This example adds the
busybox container to the
$ docker run -itd --network=mynet busybox
If you want to add a container to a network after the container is already
running, use the
docker network connect subcommand.
You can connect multiple containers to the same network. Once connected, the
containers can communicate using only another container’s IP address or name.
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 disconnect a container from a network using the
Specify advanced options
When you create a network, Engine creates a non-overlapping subnetwork for the
network by default. This subnetwork is not a subdivision of an existing
network. It is purely for ip-addressing purposes. You can override this default
and specify subnetwork values directly using the
--subnet option. On a
bridge network you can only create a single subnet:
$ docker network create --driver=bridge --subnet=192.168.0.0/16 br0
Additionally, you also specify the
$ docker network create \ --driver=bridge \ --subnet=172.28.0.0/16 \ --ip-range=172.28.5.0/24 \ --gateway=172.28.5.254 \ br0
If you omit the
--gateway flag the Engine selects one for you from inside a
preferred pool. For
overlay networks and for network driver plugins that
support it you can create multiple subnetworks.
$ docker network create -d overlay \ --subnet=192.168.0.0/16 \ --subnet=126.96.36.199/16 \ --gateway=192.168.0.100 \ --gateway=188.8.131.52 \ --ip-range=192.168.1.0/24 \ --aux-address="my-router=192.168.1.5" --aux-address="my-switch=192.168.1.6" \ --aux-address="my-printer=184.108.40.206" --aux-address="my-nas=220.127.116.11" \ my-multihost-network
Be sure that your subnetworks do not overlap. If they do, the network create fails and Engine returns an error.
Bridge driver options
When creating a custom network, the default network driver (i.e.
additional options that can be passed. The following are those options and the
equivalent docker daemon flags used for docker0 bridge:
||-||bridge name to be used when creating the Linux bridge|
||Enable IP masquerading|
||Enable or Disable Inter Container Connectivity|
||Default IP when binding container ports|
||Set the containers network MTU|
The following arguments can be passed to
docker network create for any
network driver, again with their approximate equivalents to
||-||IPv4 or IPv6 Gateway for the master subnet|
||Allocate IPs from a range|
||-||Restrict external access to the network|
||Enable IPv6 networking|
||Subnet for network|
For example, let’s use
--opt options to specify an IP address binding
when publishing ports:
$ docker network create \ -o "com.docker.network.bridge.host_binding_ipv4"="172.19.0.1" \ simple-network
Network internal mode
By default, when you connect a container to an
overlay network, Docker also
connects a bridge network to it to provide external connectivity. If you want
to create an externally isolated
overlay network, you can specify the