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Boris
Asked: 2021-09-04 05:37:26 +0800 CST

Docker compose - disable default gateway route

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Is it possible to prevent docker from defining default route when using docker-compose yaml file?

If my docker-compose.yaml defines network ipam with default driver and any subnet, seams like docker (or docker compose) automatically assigns default route to the routing table of the docker that is attached to this network). Is there any way to disable it?

docker docker-compose docker-networking

1 Answers

  1. Unfortunately: no.

    A similar feature request (#20179) has been open at the GitHub repository for almost 6 years, so I truly believe that this feature is not being implemented any time soon.

    My current workaround is, similar to what @Zoredache mentioned, to add a bash script to your containers and set the desired gateway IP address through environment variables. The script deletes the default route and adds it back with the custom IP as the gateway.

    Edit: the essence of my script:

    if [ -n "$GW" ]; then
    ip route delete default ;
    ip route add default via $GW ;
fi

    If you do want to change the default gateway of your container you run the container with the appropriate environment variable GW=192.168.0.1 and the script takes care of the rest. Furthermore, make sure to include the script in either the CMDor ENTRYPOINT of your Dockerfile
    NOTE: Requires the iproute2 package.

    Might not be the prettiest solution, but it gets the job done.

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