matrix-docker-ansible-deploy/docs/configuring-playbook-external-postgres.md

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# Using an external PostgreSQL server (optional)
By default, this playbook would set up a PostgreSQL database server on your machine, running in a Docker container.
If that's alright, you can skip this.
If you'd like to use an external PostgreSQL server that you manage, you can edit your configuration file (`inventory/matrix.<your-domain>/vars.yml`).
It should be something like this:
```yaml
matrix_postgres_use_external: true
matrix_postgres_connection_hostname: "your-postgres-server-hostname"
matrix_postgres_connection_username: "your-postgres-server-username"
matrix_postgres_connection_password: "your-postgres-server-password"
matrix_postgres_db_name: "your-postgres-server-database-name"
```
The database (as specified in `matrix_postgres_db_name`) must exist and be accessible with the given credentials.
It must be empty or contain a valid Matrix Synapse database. If empty, Matrix Synapse would populate it the first time it runs.