@stitch10925 hello again.
You are correct LEAP 15.4 has been EOL for some time now (07 Dec 2023) 15.5 just reached its EOL (31 Dec 2024) so you want to consider moving from there to 15.6 now. You can either follow the two upgrade How-tos, and do it step-wise:
https://rockstor.com/docs/howtos/15-4_to_15-5.html
and then
https://rockstor.com/docs/howtos/15-5_to_15-6.html
or, backup your configuration (and items you manually changed, not through the WebUI), and re-install it using the one of the official 15.6 downloads.
As for the docker service, I believe it’s dependent on the rockstor services to be started, so you could do another
systemctl restart network
and then
systemctl start rockstor-bootstrap
(or you execute the start of rockstor-build, rockstor-pre and rockstor individually), and see where that lands you. If it doesn’t work, you could check both the rockstor logs or journalctl -xe to see whether you get a better idea of what else might be going wrong.
This might be an issue with your Rockon Root. You mentioned you did some cleanup, did that include snapshots? If so, you might have inadvertently deleted some of the Rockon Root snapshots, which would lead to docker failing. If that is the case, then your best bet is to recreate the rockon root and associate it with the Rockon service again.
But that’s just one thought.