99 lines
3.9 KiB
Markdown
99 lines
3.9 KiB
Markdown
---
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stage: none
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group: unassigned
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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---
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# Managing PostgreSQL extensions **(FREE SELF)**
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This guide documents how to manage PostgreSQL extensions for installations with an external
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PostgreSQL database.
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The following extensions must be loaded into the GitLab database:
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| Extension | Minimum GitLab version |
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|--------------|------------------------|
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| `pg_trgm` | 8.6 |
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| `btree_gist` | 13.1 |
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| `plpgsql` | 11.7 |
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In order to install extensions, PostgreSQL requires the user to have superuser privileges.
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Typically, the GitLab database user is not a superuser. Therefore, regular database migrations
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cannot be used in installing extensions and instead, extensions have to be installed manually
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prior to upgrading GitLab to a newer version.
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## Installing PostgreSQL extensions manually
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In order to install a PostgreSQL extension, this procedure should be followed:
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1. Connect to the GitLab PostgreSQL database using a superuser, for example:
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```shell
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sudo gitlab-psql -d gitlabhq_production
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```
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1. Install the extension (`btree_gist` in this example) using [`CREATE EXTENSION`](https://www.postgresql.org/docs/11/sql-createextension.html):
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```sql
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CREATE EXTENSION IF NOT EXISTS btree_gist
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```
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1. Verify installed extensions:
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```shell
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gitlabhq_production=# \dx
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List of installed extensions
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Name | Version | Schema | Description
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------------+---------+------------+-------------------------------------------------------------------
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btree_gist | 1.5 | public | support for indexing common datatypes in GiST
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pg_trgm | 1.4 | public | text similarity measurement and index searching based on trigrams
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plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language
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(3 rows)
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```
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On some systems you may need to install an additional package (for example,
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`postgresql-contrib`) for certain extensions to become available.
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## Typical failure scenarios
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The following is an example of a new GitLab installation failing because the extension hasn't been
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installed first.
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```shell
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---- Begin output of "bash" "/tmp/chef-script20210513-52940-d9b1gs" ----
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STDOUT: psql:/opt/gitlab/embedded/service/gitlab-rails/db/structure.sql:9: ERROR: permission denied to create extension "btree_gist"
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HINT: Must be superuser to create this extension.
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rake aborted!
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failed to execute:
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psql -v ON_ERROR_STOP=1 -q -X -f /opt/gitlab/embedded/service/gitlab-rails/db/structure.sql --single-transaction gitlabhq_production
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```
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The following is an example of a situation when the extension hasn't been installed before running migrations.
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In this scenario, the database migration fails to create the extension `btree_gist` because of insufficient
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privileges.
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```shell
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== 20200515152649 EnableBtreeGistExtension: migrating =========================
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-- execute("CREATE EXTENSION IF NOT EXISTS btree_gist")
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GitLab requires the PostgreSQL extension 'btree_gist' installed in database 'gitlabhq_production', but
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the database user is not allowed to install the extension.
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You can either install the extension manually using a database superuser:
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CREATE EXTENSION IF NOT EXISTS btree_gist
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Or, you can solve this by logging in to the GitLab database (gitlabhq_production) using a superuser and running:
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ALTER regular WITH SUPERUSER
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This query will grant the user superuser permissions, ensuring any database extensions
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can be installed through migrations.
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```
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To recover from failed migrations, the extension must be installed manually by a superuser, and the
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GitLab upgrade completed by [re-running the database migrations](../administration/raketasks/maintenance.md#run-incomplete-database-migrations):
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```shell
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sudo gitlab-rake db:migrate
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```
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