External PostgreSQL database

This document assumes you already have your own PostgreSQL database.

If you do not have one, consider a cloud provided solution like AWS Aurora or GCP Cloud SQL. For on-premise or deployment to VM, consider our Omnibus GitLab package.

External database requirements

To use an external database with the gitlab chart, there are a few prerequisites.

  1. GitLab requires PostgreSQL 9.6.
  2. The pg_trgm extension must be available.
  3. An empty database to use.
  4. A user with full access granted to the database above.
  5. A Kubernetes Secret with the password for the user above.
  6. Ensure that the database is reachable from the cluster. Be sure firewall policies are in place to allow traffic.

Configuring gitlab to use an external database

You need to set the following parameters:

  • postgresql.install: Set to false to disable the embedded database.
  • global.psql.host: Set to the hostname of the external database, can be a domain or an IP address.
  • global.psql.password.secret: The name of the secret which contains the database password for the gitlab user..
  • global.psql.password.key: The key within the secret, which contains the password. The password should be unencoded value.

Items below can be further customized if you are not using the defaults:

  • global.psql.port: The port the database is available on, defaults to 5432.
  • global.psql.database: The name of the database.
  • global.psql.username: The user with access to the database.

If you use a mutual TLS connection to the database:

  • global.psql.ssl.secret: A secret containing client certificate, key and certificate authority.
  • global.psql.ssl.serverCA: The key inside the secret refering the certificate authority (CA).
  • global.psql.ssl.clientCertificate: They key inside the secret refering the client certificate.
  • global.psql.ssl.clientKey: The client inside the secret.

For example, pass these values via helm’s --set flag while deploying:

helm install
  --set postgresql.install=false
  --set global.psql.host=psql.example
  --set global.psql.password.secret=gitlab-postgresql-password
  --set global.psql.password.key=postgres-password