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81 lines
4.2 KiB
Markdown
81 lines
4.2 KiB
Markdown
<!--
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SPDX-FileCopyrightText: 2019 - 2024 Slavi Pantaleev
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SPDX-FileCopyrightText: 2019 Michael Haak
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SPDX-FileCopyrightText: 2021 - 2023 MDAD project contributors
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SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
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SPDX-License-Identifier: AGPL-3.0-or-later
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-->
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# Migrating to new server
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This documentation explains how to migrate your Matrix services (server, client, bridges, etc.) and data **from an old server to a new server**.
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**Notes**:
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- 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`).
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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.
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- 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.
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- You can't change the domain (specified in the `matrix_domain` variable) after the initial deployment.
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## Lower DNS TTL
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Prepare by lowering DNS TTL for your domains (`matrix.example.com`, etc.), so that DNS record changes would happen faster, leading to less downtime.
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## Stop services on the old server completely
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Before migrating, you need to stop all services on the old server and make sure they won't be starting again.
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To do so, it is recommended to run the `systemctl` command on the server. Running the playbook's `stop` tag also stops the services, but just once; they will start again if you reboot the server.
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Log in to the old server and run the command as `root` (or a user that can run it with `sudo`):
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```sh
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cd /etc/systemd/system/ && systemctl disable --now matrix*
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```
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## Copy data directory to the new server
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After you've confirmed that all services were stopped, copy the `/matrix` directory from the old server to the new server. When copying, make sure to preserve ownership and permissions (use `cp -p` or `rsync -ar`)!
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## Adjust DNS records
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Make sure your DNS records are adjusted to point to the new server's IP address.
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## Update `inventory/hosts` file
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Having adjusted DNS records, replace the old server's external IP address on the `inventory/hosts` file with that of the new server.
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## Create `matrix` user and group on the new server
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Then, run the command below on your local computer to create the `matrix` user and group on the new server:
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```sh
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ansible-playbook -i inventory/hosts setup.yml --tags=setup-system-user
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```
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The shortcut command with `just` program is also available: `just run-tags setup-system-user`
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**Note**: because the `matrix` user and group are created dynamically on each server, the user/group ID may differ between the old and new server. We suggest that you adjust ownership of `/matrix` files. To adjust the ownership, log in to the new server and run the command:
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```sh
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chown -R matrix:matrix /matrix
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```
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## Install and start all services on the new server
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Finally, run the command below on your local computer to finish the installation and start all services:
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```sh
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ansible-playbook -i inventory/hosts setup.yml --tags=install-all,start
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```
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The shortcut command with `just` program is also available: `just run-tags install-all,start`
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### Check if services work
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After starting the services, you probably might want to ensure that you've migrated things correctly and that services are running. For instructions, see: [check if services work](maintenance-and-troubleshooting.md#how-to-check-if-services-work)
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Having make sure that both services and federation work as expected, you can safely shutdown the old server.
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