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matrix-docker-ansible-deploy/docs/configuring-playbook-external-postgres.md
Slavi Pantaleev c10182e5a6 Make roles more independent of one another
With this change, the following roles are now only dependent
on the minimal `matrix-base` role:
- `matrix-corporal`
- `matrix-coturn`
- `matrix-mailer`
- `matrix-mxisd`
- `matrix-postgres`
- `matrix-riot-web`
- `matrix-synapse`

The `matrix-nginx-proxy` role still does too much and remains
dependent on the others.

Wiring up the various (now-independent) roles happens
via a glue variables file (`group_vars/matrix-servers`).
It's triggered for all hosts in the `matrix-servers` group.

According to Ansible's rules of priority, we have the following
chain of inclusion/overriding now:
- role defaults (mostly empty or good for independent usage)
- playbook glue variables (`group_vars/matrix-servers`)
- inventory host variables (`inventory/host_vars/matrix.<your-domain>`)

All roles default to enabling their main component
(e.g. `matrix_mxisd_enabled: true`, `matrix_riot_web_enabled: true`).
Reasoning: if a role is included in a playbook (especially separately,
in another playbook), it should "work" by default.

Our playbook disables some of those if they are not generally useful
(e.g. `matrix_corporal_enabled: false`).
2019-01-16 18:05:48 +02:00

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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:

matrix_postgres_enabled: false

# Rewire Synapse to use your external Postgres server
matrix_synapse_database_host: "your-postgres-server-hostname"
matrix_synapse_database_user: "your-postgres-server-username"
matrix_synapse_database_password: "your-postgres-server-password"
matrix_synapse_database_database: "your-postgres-server-database-name"

The database (as specified in matrix_synapse_database_database) must exist and be accessible with the given credentials. It must be empty or contain a valid Synapse database. If empty, Synapse would populate it the first time it runs.

Note: the external server that you specify in matrix_synapse_database_host must be accessible from within the matrix-synapse Docker container (and possibly other containers too). This means that it either needs to be a publicly accessible hostname or that it's a hostname on the same Docker network where all containers installed by this playbook run (a network called matrix by default). Using a local PostgreSQL instance on the host (running on the same machine, but not in a container) is not possible.