Allow custom user to be specified

[micheljung]

Currently, this docker image uses a hard coded user and group grafana within the container. The problem with this, when using volumes, is that all files created by grafana:grafana inside the container belong to some "random" user on the host.

In my case, the files created by grafana:grafana belong the the user syslog:crontab on the host.

Now, unless someone knows how to map container users to host users, it would good if the user/group could be specified as environment variables which would be used like so:

chown -R ${GRAFANA_USER}:${GRAFANA_GROUP} /etc/grafana

Alternatively, you could define USER grafana in the Dockerfile. This can then be overridden by the user. I'm no Docker pro, but I read running containers as root is bad practice. Not sure this applies as well if you change users inside the container.

[bergquist]

Sounds like a reasonable solution. A PR would be appreciated.

[micheljung]

I'm a bit confused. In run.sh, the owner of directories is changed to grafana but I couldn't find the place where this user is being created. What am I missing?

Update turns out the user is being created by the .deb package, so it's basically baked into the image and can not be changed.

It looks like there's no solution to this. Maybe I need to Isolate containers with a user namespace instead.

[wolkenschieber]

On my host system the grafana-server is run as user ntp. This somehow fails the time synchronization.

[xlson]

This will be resolved when we release Grafana 5.1 with the update image tracked in #146.