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Backing Up and Restoring a Docker Swarm

For the last six months, the Acme Anvil Corporation has been migrating some of their bare metal infrastructure to Docker containers. A schism has developed between the members of your team on whether to use Docker Swarm or Kubernetes. To settle the dispute, your manager has decided to create a series of challenges. You have been tasked with creating a demo on how to back up and restore a Docker swarm. You are to set up a Docker swarm with 3 nodes, scale the backup service up to 3 nodes, and back up your master node and restore it to a backup instance.

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Path Info

Level

Intermediate

Duration

1h 30m

Published

Nov 07, 2018

Challenge

Back up the swarm master.
Stop the docker service on the master node.
```
systemctl stop docker
```
Back up the /var/lib/docker/swarm/ directory.
```
systemctl stop docker
tar czvf swarm.tgz /var/lib/docker/swarm/
```
Challenge

Restore the swarm on the backup master.
Copy the swarm backup from the master node to the backup master:
```
scp swarm.tar.tgz cloud_user@BACKUP_IP_ADDRESS:/home/cloud_user/
```
From the backup master, extract the backup file:
```
tar xzvf swarm.tar.tgz
```
Copy the swarm directory to /var/lib/docker/swarm:
```
cd /var/lib/docker
cp -rf swarm/ /var/lib/docker/
```
Reinitialize the swarm:
```
docker swarm init --force-new-cluster
```
Challenge

Add the worker nodes to the restored cluster.
Remove each node from the old swarm:
```
docker swarm leave
```
Add each node to the backup swarm:
```
docker swarm join --token TOKEN IP_ADDRESS:2377
```
Challenge

Distribute the replicas across the swarm.
Scale the replicas down to 1:
```
docker service scale backup=1
```
Next, scale the replicas up to 3 to distribute the replicas across the swarm:
```
docker service scale backup=3
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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