Looping 'Starting PMS'



Setting up a PMS on a fresh Debian installation, using docker…
Other docker containers are behaving as they should, but the PMS official build (plexinc/pms-docker) is failing to start. The docker logs show:

Plex Media Server first run setup complete
[cont-init.d] 40-plex-first-run: exited 0.
[cont-init.d] 50-plex-update: executing... 
[cont-init.d] 50-plex-update: exited 0.
[cont-init.d] done.
[services.d] starting services
[services.d] done.
Starting Plex Media Server.
Starting Plex Media Server.

The last line then repeats indefinitely…

Looking at the PMS log in the config directory it shows nothing obvious to me:

Mar 13, 2018 21:49:42.738 [0x7f9dfa7fe700] INFO - Plex Media Server v1.12.0.4829-6de959918 - ubuntu docker x86_64 - build: linux-ubuntu-x86_64 ubuntu - GMT 00:00
Mar 13, 2018 21:49:42.740 [0x7f9dfa7fe700] INFO - Linux version: 4.9.0-4-amd64 (#1 SMP Debian 4.9.65-3+deb9u1 (2017-12-23)), language: C
Mar 13, 2018 21:49:42.740 [0x7f9dfa7fe700] INFO - Processor AMD Phenom(tm) II X6 1100T Processor
Mar 13, 2018 21:49:42.740 [0x7f9dfa7fe700] INFO - /usr/lib/plexmediaserver/Plex Media Server

I have tried starting the container as both root and as a docker user (clearing out the config each time), and both behave the same.
I have tried both bridge and host networking, and both behave the same.

Clearly I am doing something wrong, but I can’t currently spot it at all - hints/ideas/pointers all welcome.

Additional system notes:
Debian 9.3: 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3+deb9u1
Docker package: 17.12.1~ce-0~debian

version: '2'
container_name: plex
image: plexinc/pms-docker
restart: unless-stopped
- 32400:32400/tcp
- 3005:3005/tcp
- 8324:8324/tcp
- 32469:32469/tcp
- 1900:1900/udp
- 32410:32410/udp
- 32412:32412/udp
- 32413:32413/udp
- 32414:32414/udp
- TZ=Europe/London
- PLEX_CLAIM=claim-######
- ADVERTISE_IP=http://<HostIP>:32400/
hostname: mediaserver
- /storage/Plex/dB:/config
- /storage/Plex/transcode:/transcode
- /storage/Plex/media:/data


After revising the "perfect media server" article, and it's 18 month followup I spotted that they used a raw disk for their config directory.
Doesn't look like mergerFS and the config directory play well together, so I've just pointed at exactly the same location, but on the underlying filesystem.

I now have a login - so moving in the right direction...

Need to work out migration of the library data from the old Windows Plex backup to the new Docker based system.