*Disclaimer: I’m not a developer, just a Rockstor user with some Linux knowledge
The rockstor log shows that the docker (rockon) service is not running, however it doesn’t appear to show anything about when it attempted to start the docker service, only when it tried to use it. (When attempting to query status of containers)
Your journalctl information appears to be too late.
Please open two shells on the system simultaneously, on the first run (and capture the output of):
journalctl -fu docker.service
And then on the second, attempt to restart docker manually, with:
systemctl restart docker.service
Provide the logs from the journalctl command for analysis.