docker exec live_db_1 pg_dump -Fc -U mastodon mastodon_production > 20210309.dump
tar --exclude=public/system/cache -zcf mastodon_system_backup_20210309.tar.gz public/system/
git fetch --tags  # fetch all tags from the remote, leaving the working directory intact
git stash # stash any changes made to the working directory (typically only docker-compose.yml file)
git checkout v3.3.0  # checkout working directory to the v3.3.0 release
git stash pop # restore any changes you made to the working directory (i.e. passwords in docker-compose.yml files, verify via git diff)
docker-compose build  # build the web, streaming and sidekiq services, they all share the same container image. This may take a while.
docker images  # you should see the freshly build image at the top, something like: tootsuite/mastodon   latest              aa82ba57a3f4        About a minute ago   1.98GB
docker-compose run --rm -e SKIP_POST_DEPLOYMENT_MIGRATIONS=true web rails db:migrate  # Run the pre-deployment database migrations
# You can check the return code via echo $?, if the rc is zero than the migration was successful
docker-compose down # shutdown all docker-compose services
docker-compose run --rm web bin/tootctl cache clear # clear cache
docker-compose run --rm web rails db:migrate # Run post-deployment database migrations, again verify that it succeeded via echo $?. 0 means success
docker-compose up -d  # create and start containers, detaching from their stdout
docker system prune -a # remove unused docker data (images, containers, volumes)