CentOS 7

Docker 20.10

I want to delete all networks.

docker container ls
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

As you can see no containers. I was removed it before. I try this:

docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
1b6758d38df3   bridge    bridge    local
89dea066d590   host      host      local
8e235018309e   none      null      local

And this:

docker network rm 1b6758d38df3
Error response from daemon: bridge is a pre-defined network and cannot be removed

P.S the folder /var/lib/docker is empty

CodePudding user response：

Those are the system networks included in every Docker installation, they are not like user-defined networks and cannot be removed.

From the docs for thedocker network prune command:

Note that system networks such as bridge, host, and none will never be pruned

From the Network containers tutorial page:

Every installation of the Docker Engine automatically includes three default networks. [...] The network named bridge is a special network. Unless you tell it otherwise, Docker always launches your containers in this network.

This would mean that removing those networks would break some of Docker's networking features.