uid collision on Centos 7 host

[dangogh]

The hard-coded uid=999 value conflicts with the systemd-bus-proxy user on CentOS 7

$ grep :999: /etc/passwd
systemd-bus-proxy:x:999:997:systemd Bus Proxy:/:/sbin/nologin

This makes it difficult to use a volume mapped to a host directory as it is owned by the above user. Is there a recommended way to handle this?

[tianon]

One solution that will work the most generically is to look into Docker's User Namespaces support to see if it's a fit for your use case (which would allow you to remap the user directly as desired), but barring that, you'll likely be interested in #253. 👍

[dangogh]

great responsiveness.. thanks! 👍

[beauremus]

I don't fully understand the solution. @dangogh what did you end up doing?

[dangogh]

I ended up in the entrypoint script adding this bash function which sets the owner of the subdir I created to be the same as the volume I had mounted:

setowner() {
    own=$(stat -c '%u:%g' $1)
    shift
    [[ -n $@ ]] && chown -R ${own} "$@"
}
...
setowner /myvolume /myvolume/newsubdir

[beauremus]

Alright. Thanks for the response. Not happy with the hacky solution.

[dangogh]

neither am I -- one hack on top of another, but sometimes it's what you can do