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Migrating GitLab from internal to external PostgreSQL

PostgreSQL Installation

This will cover CentOS 7 and PostgreSQL 10, and GitLab 10/11 installed using Omnibus. On other systems YMMV.

Find the URL for the current CentOS 7 PostgreSQL RPM, then install it. E.g.:

yum install https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-7-x86_64/pgdg-centos10-10-2.noarch.rpm

Then open /etc/yum.repos.d/CentOS-Base.repo and add to the base and updates sections:

exclude=postgresql*

Install the server and the contrib additions, because GitLab relies on the pg_trgm extension:

yum install postgresql10-server postgresql10-contrib

Initialize Postgres:

/usr/pgsql-10/bin/postgresql-10-setup initdb

Set up authentication via /var/lib/pgsql/10/data/pg_hba.conf. Use md5 to have password authentication on the local interfaces instead of ident:

host    all             all             127.0.0.1/32            md5
host    all             all             ::1/128                 md5

Finally, start and enable the engine:

systemctl start postgresql-10.service
systemctl enable postgresql-10.service

Database Export

Perform a pg_dumpall on GitLab’s internal DB:

sudo -u gitlab-psql /opt/gitlab/embedded/bin/pg_dumpall --username=gitlab-psql --host=/var/opt/gitlab/postgresql > /var/lib/pgsql/database.sql

Database Import

It’s a oneliner:

sudo -u postgres psql -f /var/lib/pgsql/database.sql

Then make sure to remove /var/lib/pgsql/database.sql.

GitLab Configuration

First off, you need to set the gitlab PostgreSQL user’s password:

sudo -u postgres psql -c "ALTER USER gitlab ENCRYPTED PASSWORD '***' VALID UNTIL 'infinity';"

Add these to /etc/gitlab/gitlab.rb:

# Disable the built-in Postgres
postgresql['enable'] = false
# Fill in the connection details
gitlab_rails['db_adapter'] = 'postgresql'
gitlab_rails['db_encoding'] = 'utf8'
gitlab_rails['db_host'] = '127.0.0.1'
gitlab_rails['db_port'] = 5432
gitlab_rails['db_database'] = "gitlabhq_production"
gitlab_rails['db_username'] = 'gitlab'
gitlab_rails['db_password'] = '***'

Now apply the changes:

gitlab-ctl reconfigure && gitlab-ctl restart

And that’s pretty much it. Now your admin panel should show 10.4 instead of 9.6:

Cheers!

Useful Snippets

Current list of internal DBs:

gitlab-psql --list

Opening the internal DB console:

gitlab-rails dbconsole

Create a GitLab backup under /var/opt/gitlab/backups:

gitlab-rake gitlab:backup:create

Starting the internal engine manually:

gitlab-ctl start postgresql

References

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