Changing default subnet for docker custom networks

Question

Our internal network has the range 172.20.0.0/16 reserved for internal purposes and docker uses the 172 range by default for its internal networking. I can reset the bridge to l

Answer 1

For anyone who found this question. Now it is possible.

$ docker -v
Docker version 18.06.0-ce, build 0ffa825

Edit or create config file for docker daemon:

# nano /etc/docker/daemon.json

Add lines:

{
  "default-address-pools":
  [
    {"base":"10.10.0.0/16","size":24}
  ]
}

Restart dockerd:

# service docker restart

Check the result:

$ docker network create foo
$ docker network inspect foo | grep Subnet
                    "Subnet": "10.10.1.0/24"

It works for docker-compose too.

Your "bip": "192.168.2.1/24" works for bridge0 only. It means that any container which run without --network will use this default network.