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matrix-docker-ansible-deploy/docs/maintenance-migrating.md
Slavi Pantaleev 8a7b3d5bd0
Make instructions simpler and safer 
Changes to the original are:
- it tells people to stop and disable services, so that:
   - services won't be running while you are copying files
   - services won't accidentally start again later
- it does the file-copying in 1 step
- it does copying before running `--tags=setup-all`, so that existing files (SSL certificates, etc.) can be reused. Otherwise, the playbook starts from a blank slate, retrieves them anew, generates new signing keys anew, etc. Only to have those replaced by your own old backup later.
- it mentions DNS changes
- combines `--tags=setup-all,start` into a single step, thanks to the files being already copied
2019-06-12 09:36:19 +03:00

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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-all,start. This will create the matrix user and group and start all services on the new server