The docker package is based on the Debian/Ubuntu install. Here are where the files are located: http://docs.grafana.org/installation/debian/#package-details
But GF_PATHS_CONFIG
should work. This worked for me:
- Created an ini file outside of docker called grafana2.ini in /etc/grafana
- Ran:
docker run -d --name=grafana -v /etc/grafana/grafana2.ini:/etc/grafana/grafana2.ini -e "GF_PATHS_CONFIG=/etc/grafana/grafana2.ini" grafana/grafana:5.0.3