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Update docs/maintenance-migrating.md: reflect the review and edit a note for creating a temporary account on another server

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Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>
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@ -6,31 +6,27 @@ This documentation explains how to migrate your Matrix services (server, client,
- This migration guide is applicable if you migrate from one server to another server having the same CPU architecture (e.g. both servers being `amd64`).
If you're trying to migrate between different architectures (e.g. `amd64` --> `arm64`), simply copying the complete `/matrix` directory is **not** possible as it would move the raw PostgreSQL data (`/matrix/postgres/data`) between different architectures. In this specific case, you can use the guide below as a reference, but you would also need to avoid syncing `/matrix/postgres/data` to the new host, and also dump the database on your current server and import it properly on the new server. See our [Backing up PostgreSQL](maintenance-postgres.md#backing-up-postgresql) docs for help with PostgreSQL backup/restore.
- If you have any questions about migration or encountered an issue during migration, do not hesitate to ask for help on [our Matrix room](https://matrix.to/#/%23matrix-docker-ansible-deploy:devture.com).
- If you have any questions about migration or encountered an issue during migration, do not hesitate to ask for help on [our Matrix room](https://matrix.to/#/%23matrix-docker-ansible-deploy:devture.com). You probably might want to prepare a temporary/sub account on another Matrix server in case it becomes impossible to use your server due to migration failure by any chance.
## Lower DNS TTL
Prepare by lowering DNS TTL for your domains (`matrix.example.com`, etc.), so that DNS record changes would happen faster, leading to less downtime.
## Stop services on the old server
## Stop services on the old server completely
Before migrating, you need to stop all services on the old server and make sure they won't be starting again.
To stop the services, go to the `matrix-docker-ansible-deploy` directory on your local computer, and run the command:
To do so, it is recommended to run the `systemctl` command on the server. Running the playbook with `stop` tag does also stop the services, but just once; they will start again if you reboot the server.
Log in to the old server and run the command as `root` (or a user that can run it with `sudo`):
```sh
ansible-playbook -i inventory/hosts setup.yml --tags=stop
```
Alternatively, you can log in to the old server and run the command (you might have to `cd` to `/etc/systemd/system/` first):
```sh
systemctl disable --now matrix*
cd /etc/systemd/system/ && systemctl disable --now matrix*
```
## Copy data directory to the new server
Then, copy directory `/matrix` from the old server to the new server. When copying, make sure to preserve ownership and permissions (use `cp -p` or `rsync -ar`)!
After you confirmed that all services were stopped, copy directory `/matrix` from the old server to the new server. When copying, make sure to preserve ownership and permissions (use `cp -p` or `rsync -ar`)!
## Adjust DNS records
@ -44,7 +40,7 @@ Having adjusted DNS records, replace the old server's external IP address on the
## Create `matrix` user and group on the new server
After updating `inventory/hosts` file, run the command below on your local computer to create the `matrix` user and group on the new server:
Then, run the command below on your local computer to create the `matrix` user and group on the new server:
```sh
ansible-playbook -i inventory/hosts setup.yml --tags=setup-system-user