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Mention Postgres backup

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Slavi Pantaleev 2021-01-22 13:58:55 +02:00
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CHANGELOG.md
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@ -30,20 +30,22 @@ By default, the playbook runs an integrated Postgres server for you in a contain
To migrate to the new setup, expect a few minutes of downtime, while you follow these steps:
1. Generate a strong password to be used for your superuser Postgres user (called `matrix`). You can use `pwgen -s 64 1` to generate it, or some other tool.
1. We believe the steps below are safe and you won't encounter any data loss, but consider [making a Postgres backup](docs/maintenance-postgres.md#backing-up-postgresql) anyway. If you've never backed up Postgres, now would be a good time to try it.
2. Update your playbook's `inventory/host_vars/matrix.DOMAIN/vars.yml` file, adding a line like this:
2. Generate a strong password to be used for your superuser Postgres user (called `matrix`). You can use `pwgen -s 64 1` to generate it, or some other tool.
3. Update your playbook's `inventory/host_vars/matrix.DOMAIN/vars.yml` file, adding a line like this:
```yaml
matrix_postgres_connection_password: YOUR_POSTGRES_PASSWORD_HERE
```
.. where `YOUR_POSTGRES_PASSWORD_HERE` is to be replaced with the password you generated during step #1.
3. Stop all services: `ansible-playbook -i inventory/hosts setup.yml --tags=stop`
4. Log in to the server via SSH. The next commands will be performed there.
5. Start the Postgres database server: `systemctl start matrix-postgres`
6. Open a Postgres shell: `/usr/local/bin/matrix-postgres-cli`
7. Execute the following query, while making sure to **change the password inside**:
4. Stop all services: `ansible-playbook -i inventory/hosts setup.yml --tags=stop`
5. Log in to the server via SSH. The next commands will be performed there.
6. Start the Postgres database server: `systemctl start matrix-postgres`
7. Open a Postgres shell: `/usr/local/bin/matrix-postgres-cli`
8. Execute the following query, while making sure to **change the password inside**:
```sql
CREATE ROLE matrix LOGIN SUPERUSER PASSWORD 'YOUR_POSTGRES_PASSWORD_HERE';
@ -51,7 +53,7 @@ CREATE ROLE matrix LOGIN SUPERUSER PASSWORD 'YOUR_POSTGRES_PASSWORD_HERE';
.. where `YOUR_POSTGRES_PASSWORD_HERE` is to be replaced with the password you generated during step #1.
8. Execute the following queries as you see them (no modifications necessary, so you can just paste them):
9. Execute the following queries as you see them (no modifications necessary, so you can just paste them):
```sql
CREATE DATABASE matrix OWNER matrix;
@ -71,7 +73,7 @@ ALTER ROLE synapse NOSUPERUSER NOCREATEDB NOCREATEROLE;
You may need to press *Enter* after pasting the lines above.
1. Re-run the playbook normally: `ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`
10. Re-run the playbook normally: `ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`
### What do I do if I'm using an external Postgres server?