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matrix-docker-ansible-deploy/docs/uninstalling.md
Slavi Pantaleev e1690722f7 Replace cronjobs with systemd timers
Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/756

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/737

I feel like timers are somewhat more complicated and dirty (compared to
cronjobs), but they come with these benefits:

- log output goes to journald
- on newer systemd distros, you can see when the timer fired, when it
will fire, etc.
- we don't need to rely on cron (reducing our dependencies to just
systemd + Docker)

Cronjobs work well, but it's one more dependency that needs to be
installed. We were even asking people to install it manually
(in `docs/prerequisites.md`), which could have gone unnoticed.

Once in a while someone says "my SSL certificates didn't renew"
and it's likely because they forgot to install a cron daemon.

Switching to systemd timers means that installation is simpler
and more unified.
2021-01-14 23:35:50 +02:00

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Markdown

# Uninstalling
**Warnings**:
- If your server federates with others, make sure to **leave any federated rooms before nuking your Matrix server's data**. Otherwise, the next time you set up a Matrix server for this domain (regardless of the installation method you use), you'll encounter trouble federating.
- If you have some trouble with your installation, you can just [re-run the playbook](installing.md) and it will try to set things up again. **Uninstalling and then installing anew rarely solves anything**.
-----------------
## Uninstalling using a script
Installing places a `/usr/local/bin/matrix-remove-all` script on the server.
You can run it to to have it uninstall things for you automatically (see below). **Use with caution!**
## Uninstalling manually
If you prefer to uninstall manually, run these commands (most are meant to be executed on the Matrix server itself):
- ensure all Matrix services are stopped: `ansible-playbook -i inventory/hosts setup.yml --tags=stop` (if you can't get Ansible working to run this command, you can run `systemctl stop 'matrix*'` manually on the server)
- delete the Matrix-related systemd `.service` and `.timer` files (`rm -f /etc/systemd/system/matrix*.{service,timer}`) and reload systemd (`systemctl daemon-reload`)
- delete some helper scripts (`rm -f /usr/local/bin/matrix*`)
- delete some cached Docker images (`docker system prune -a`) or just delete them all (`docker rmi $(docker images -aq)`)
- delete the Docker networks: `docker network rm matrix matrix-coturn` (might have been deleted already if you ran the `docker system prune` command)
- uninstall Docker itself, if necessary
- delete the `/matrix` directory (`rm -rf /matrix`)