Improve uninstallation instructions

Also switches to using `docker system prune -a` for a less invasive
cleanup of Docker images and related resources.
This commit is contained in:
Slavi Pantaleev 2020-11-24 09:38:17 +02:00
parent 3e2355282b
commit 27c9014cb8
2 changed files with 26 additions and 10 deletions

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# Uninstalling
**Note**: If you have some trouble with your installation configuration, you can just [re-run the playbook](installing.md) and it will try to set things up again. You don't need to uninstall and install fresh.
**Warnings**:
However, if you've installed this on some server where you have other stuff you wish to preserve, and now want get rid of Matrix, it's enough to do these:
- 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.
- ensure all Matrix services are stopped (`systemctl stop 'matrix*'`)
- 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**.
- delete the Matrix-related systemd .service files (`rm -f /etc/systemd/system/matrix*`) and reload systemd (`systemctl daemon-reload`)
-----------------
## 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` files (`rm -f /etc/systemd/system/matrix*.service`) and reload systemd (`systemctl daemon-reload`)
- delete all Matrix-related cronjobs (`rm -f /etc/cron.d/matrix*`)
- delete some helper scripts (`rm -f /usr/local/bin/matrix*`)
- delete some cached Docker images (or just delete them all: `docker rmi $(docker images -aq)`)
- delete some cached Docker images (`docker system prune -a`) or just delete them all (`docker rmi $(docker images -aq)`)
- delete the Docker network: `docker network rm matrix`
- delete the Docker network: `docker network rm matrix` (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`)
The script `/usr/local/bin/matrix-remove-all` performs all these steps (**use with caution!**).

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find /etc/cron.d/ -name "matrix-*" -delete
echo "Remove matrix scripts"
find {{ matrix_local_bin_path }}/ -name "matrix-*" -delete
echo "Remove every docker images"
docker rmi $(docker images -aq)
echo "Remove docker matrix network"
echo "Remove unused Docker images and resources"
docker system prune -af
echo "Remove Docker matrix network (should be gone already, but ..)"
docker network rm {{ matrix_docker_network }}
echo "Remove {{ matrix_base_data_path }} directory"
rm -fr "{{ matrix_base_data_path }}"