matrix-docker-ansible-deploy/docs/maintenance-migrating.md

Migrating to new server

1. Prepare by lowering DNS TTL for your domains (matrix.DOMAIN, etc.), so that DNS record changes (step 4 below) would happen faster, leading ot less downtime
2. Stop all services on the old server and make sure they won't be starting again. Execute this on the old server: systemctl disable --now matrix*
3. Copy directory /matrix from the old server to the new server. Make sure to preserve ownership and permissions (use cp -p or rsync -ar)!
4. Make sure your DNS records are adjusted to point to the new server's IP address
5. Remove old server from the inventory/hosts file and add new server.
6. Run ansible-playbook -i inventory/hosts setup.yml --tags=setup-system-user. This will create the matrix user and group on the new server
7. 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 manually by running this on the new server: chown -R matrix:matrix /matrix.
8. Run ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start to finish the installation and start all services