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If you want to migrate your old mailcow installation to a new server you can follow this:
1. Install Docker and Docker Compose on your new server.
Quick installation for most operation systems:
- Docker
curl -sSL https://get.docker.com/ | CHANNEL=stable sh
# After the installation process is finished, you may need to enable the service and make sure it is started (e.g. CentOS 7)
systemctl enable docker.service
- docker-compose
curl -L https://github.com/docker/compose/releases/download/$(curl -Ls https://www.servercow.de/docker-compose/latest.php)/docker-compose-$(uname -s)-$(uname -m) > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose
Please use the latest Docker engine available and do not use the engine that ships with your distros repository.
2. Make sure that Docker is stopped:
systemctl status docker.service
3. Run the following commands on the source machine (take care of adding the trailing slashes in the first path parameter as shown below!):
rsync -aHhP --numeric-ids --delete /opt/mailcow-dockerized/ root@some.other.machine.net:/opt/mailcow-dockerized
rsync -aHhP --numeric-ids --delete /var/lib/docker/volumes/ root@some.other.machine.net:/var/lib/docker/volumes
4. Shut down Mailcow via docker-compose down and stop Docker on the source machine.
5. Repeat step 3 with the same commands (this will be much quicker than the first time).
6. Start docker on the target machine systemctl start docker.service.
7. Go into the /opt/mailcow-dockerized directory and run docker-compose pull.
8. Start the whole mailcow stack with docker-compose up -d and everything should be fine.
9. Change your DNS settings.