Similar issues here but I never get any additional detail like the poster above. I even tried a new docker w/a new config directory but encountered the same result where "Starting Plex Media Server" just keeps repeating forever every 3-5 seconds. I'm running unRAID 6.2 final.
[s6-init] making user provided files available at /var/run/s6/etc...exited 0.
[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] 10-adduser: executing...
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-------------------------------------
GID/UID
-------------------------------------
User uid: 99
User gid: 100
-------------------------------------
[cont-init.d] 10-adduser: exited 0.
[cont-init.d] 30-dbus: executing...
[cont-init.d] 30-dbus: exited 0.
[cont-init.d] 40-chown-files: executing...
[cont-init.d] 40-chown-files: exited 0.
[cont-init.d] 50-plex-update: executing...
#####################################################
# Login via the webui at http://<ip>:32400/web #
# and restart the docker, because there was no #
# preference file found, possibly first startup. #
#####################################################
[cont-init.d] 50-plex-update: exited 0.
[cont-init.d] done.
[services.d] starting services
Starting dbus-daemon
Starting Plex Media Server.
6 3000 /config/Library/Application Support
d
[services.d] done.
dbus[273]: [system] org.freedesktop.DBus.Error.AccessDenied: Failed to set fd limit to 65536: Operation not permitted
Starting Avahi daemon
Process 279 died: No such process; trying to remove PID file. (/var/run/avahi-daemon//pid)
Found user 'avahi' (UID 106) and group 'avahi' (GID 107).
Successfully dropped root privileges.
avahi-daemon 0.6.32-rc starting up.
No service file found in /etc/avahi/services.
*** WARNING: Detected another IPv4 mDNS stack running on this host. This makes mDNS unreliable and is thus not recommended. ***
socket() failed: Address family not supported by protocol
Failed to create IPv6 socket, proceeding in IPv4 only mode
socket() failed: Address family not supported by protocol
Joining mDNS multicast group on interface virbr0.IPv4 with address 192.168.122.1.
New relevant interface virbr0.IPv4 for mDNS.
Joining mDNS multicast group on interface docker0.IPv4 with address 172.17.0.1.
New relevant interface docker0.IPv4 for mDNS.
Joining mDNS multicast group on interface br0.IPv4 with address 10.200.115.174.
New relevant interface br0.IPv4 for mDNS.
Network interface enumeration completed.
Registering new address record for 192.168.122.1 on virbr0.IPv4.
Registering new address record for 172.17.0.1 on docker0.IPv4.
Registering new address record for 10.200.115.174 on br0.IPv4.
Server startup complete. Host name is Tower.local. Local service cookie is 683560888.
Starting Plex Media Server.
6 3000 /config/Library/Application Support
d
Starting Plex Media Server.
6 3000 /config/Library/Application Support
d
Starting Plex Media Server.
6 3000 /config/Library/Application Support
d
Starting Plex Media Server.
6 3000 /config/Library/Application Support
d
Starting Plex Media Server.
6 3000 /config/Library/Application Support
d
Got SIGTERM, quitting.