A one liner to find the log files of your container:

$ docker inspect --format='{{.LogPath}}' $CONTAINER_NAME_OR_ID

$ docker ps

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                            NAMES
e4b193e54a2c        goliatone/janus     "/usr/bin/entry.sh /u"   8 weeks ago         8 weeks       0.0.0.0:3000->3000/tcp, 0.0.0.0:3333->3333/tcp   gigantic_saha

Now, if you want to see the log file:

$ docker inspect --format='{{.LogPath}}' e4b193e54a2c
/var/lib/docker/containers/e4b193e54a2c0d75e28309e55e54e416a8b3794ba3775265c3159c9d2713910c/e4b193e54a2c0d75e28309e55e54e416a8b3794ba3775265c3159c9d2713910c-json.log

Or using the container name:

$ docker inspect --format='{{.LogPath}}' gigantic_saha
/var/lib/docker/containers/e4b193e54a2c0d75e28309e55e54e416a8b3794ba3775265c3159c9d2713910c/e4b193e54a2c0d75e28309e55e54e416a8b3794ba3775265c3159c9d2713910c-json.log