Complete remove gitlab new version and install old version

remove_gitlab.sh

#! /bin/sh

#This worked for me in Ubuntu 16 and let me install an older version of gitlab: https://askubuntu.com/questions/824696/is-it-fine-to-remove-the-opt-gitlab-directory-manually-after-removing-the-gitl 213

#Remove services
sudo gitlab-ctl uninstall

#Clean any data generated by usage of the package
sudo gitlab-ctl cleanse

#You may also want to remove any accounts you configured. To do so
sudo gitlab-ctl remove-accounts

#Then remove the package using
#sudo dpkg -P gitlab-ce
yum remove gitlab-ce -y

#Furthermore, gitlab-ce uses these directories (as described here 368)
# /opt/gitlab holds application code for GitLab and its dependencies.
rm -rf /opt/gitlab

# /var/opt/gitlab holds application data and configuration files that gitlab-ctl reconfigure writes to.
rm -rf /var/opt/gitlab

# /etc/gitlab holds configuration files for omnibus-gitlab. These are the only files that you should ever have to edit manually.
rm -rf /etc/gitlab

# /var/log/gitlab contains all log data generated by components of omnibus-gitlab.
rm -rf /var/log/gitlab

#So, First remove the package recommended way (Even if you need to reinstall it). You can then remove those data using rm safely.
#Information found from omnibus-gitlab README page 368