Start Or Stop The GitLab CE Server

To start, stop or restart GitLab and all its components you just need to run the gitlab-ctl command.

Start all GitLab components:

$ sudo gitlab-ctl start

Stop all GitLab components:
$ sudo gitlab-ctl stop

Restart all GitLab components:
$ sudo gitlab-ctl restart

To start, stop or restart an individual component, run the gitlab-cli command specifying both the action and the service:
$ sudo gitlab-ctl restart sidekiq

Source :

https://docs.bitnami.com/bch/apps/gitlab/administration/control-server/