Solution by iamchanghyunpark

“I checked the pid value in the log and checked if there was a running process with the same pid, and no there was none.
I’m guessing this is because of the unexpected powerdown, and was not properly cleared.
My solution was simple”

docker-compose exec gitlab bash
vi log/unicorn.stderr.log # remove the value (which is the pid), save and exit
exit # from the bash shell of the gitlab container

#Now restart the containers
docker-compose down
docker-compose up -d