If docker is configured to work with user namespacing, containers that mount the docker socket (docker-gem for the proxy for example) are not able to do so. After the upgrade to docker compose 1.10 it should be possible to set userns: host on these containers.
If docker is configured to work with user namespacing, containers that mount the docker socket (docker-gem for the proxy for example) are not able to do so. After the upgrade to docker compose 1.10 it should be possible to set userns: host on these containers.