Recover gitlab.ce installation from disk image

My server is not booting anymore and I don’t have specific Gitlab backups.

I have full disk images, including /etc/gitlab and /opt/gitlab.

How should I reinstall gitlab from a disk backup?

After copying /etc/gitlab, /opt/gitlab and /var/opt/gitlab, I could install gitlab on top and access all data.

Maybe /opt/gitlab was not required…