V3 of Sonarr running in a CentOs7 container with gradheim python systemd replacement.
For version 3 of Sonarr run:
docker run -d --name sonarr3 -p 8989:8989 exist2resist/sonarr:latest
For version 2 of Sonarr run:
docker run -d --name sonarr3 -p 8989:8989 exist2resist/sonarr:v2