https://forum.gitlab.com/t/upgrade-gitlab-6-5-1-to-latest-version-10-6-4/15974


 apt-get purge redis-server
 apt-get install redis-server

 sudo service gitlab stop
 cd /home/git/gitlab
 sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production
 sudo -u git -H ruby script/upgrade.rb
 


 sudo mv /home/homefolder/backupfile.tar /var/opt/gitlab/backups
 sudo gitlab-rake gitlab:backup:restore command

==releases==
https://about.gitlab.com/releases/categories/releases/


==gemnenisum==
https://gitlab.com/gitlab-org/gitlab/issues/32320

 gem "gemnasium-gitlab-service", git: "https://github.com/gemnasium/gemnasium-gitlab-service", tag: "v0.2.1"


==migrate to pg==
https://github.com/gitlabhq/gitlab-recipes/tree/master/database/migrate-mysql-to-postgres

===different version pg===
https://tecadmin.net/install-postgresql-server-on-ubuntu/#

==upgrade pathway==
https://docs.gitlab.com/ee/policy/maintenance.html#upgrade-recommendations

==correct sequence==
#stop service
#change from mysql to pg
#backup
#upgrade script from 6.5.2 to 6.9.2
#modify gemfile and bundle
#backup on 6.9.2
#restore on omnibus 6.9.2
#upgrade to later version (if there is an error, fix it with manual psql)