As you may already know, backing up Swarm is absolutely essential. In this article, I'll be demonstrating how to perform a full backup of Swarm and how to restore it in case of any unfortunate incidents. But before we get into that, let me share some tips with you:
- I'm assuming that you're using Ubuntu or a similar Linux distribution.
- Swarm configurations are stored in the
- You can use any manager node to take the backup. For instance, if you have three managers, you can use any one of them to perform a full backup of Swarm.
- It's advisable to avoid using the leader-manager node as much as possible and opt for another manager instead.
- Lastly, I highly recommend scheduling regular backups.
Now, let's move on to the first step, which is to stop Docker:
sudo service docker stop
Create the backup by compressing the
/var/lib/docker/swarm in a tarball:
tar -czvf swarm.backup.tar /var/lib/docker/swarm/
Our backup is ready now 🙂
In case of an unfortunate incident, and you need to restore the backup, you can easily unzip the tarball by following these steps:
service docker stop
rm -Rf /var/lib/docker/swarm
tar -zxvf swarm.backup.tar -C /var/lib/docker
That's not all! We need to initialize Swarm again, but don't worry, there's a magic flag that can help us with that:
docker swarm init --force-new-cluster