Gitlab move to new instance

Both source and destination Gitlab versions has to be the same.

• Install fresh Gitlab on new machine.
• Make full backup on source machine

• Restore for Omnibus GitLab installations

Issue:

• users cannot connect with ssh.
• gitlab-rake check returns all OK
• File /var/opt/gitlab/.ssh/authorized_keys is empty.

Solution:

• run gitlab-rake gitlab:shell:setup to
• More info: Rebuild authorized_keys file

Related issues:

• authorized_keys file is not being updated, users can't use new keys and new users broken
• After restoring GitLab backup, new SSH public keys randomly supersede other users' existing keys