In this blog, we will see how to backup and restore etcd on the kubeadm cluster.

How to Backup ETCD on the Kubeadm Cluster

First, let’s see how to take backup of etcd, follow the below steps to backup etcd.

To take a backup of etcd you need etcdctl installed in your controller node, to install etcdctl run the below command

sudo apt install etcd-client

Once you installed etcdctl, run the below command to take a backup of etcd.

ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 \
  --cacert=<trusted-ca-file-location> \
  --cert=<cert-file-location> \
  --key=<key-file-location> \
  snapshot save <backup-file-location>

To get the locations of files specified in the above command check the etcd manifest file, to view the etcd manifest file use the command given below

cat /etc/kubernetes/manifests/etcd.yaml
Backup and Restore ETCD on the Kubeadm Cluster: etcd manifest file

By using the file location from the above file, my command will be

ETCDCTL_API=3 etcdctl   \
  --endpoints=https://127.0.0.1:2379  \
  --cacert=/etc/kubernetes/pki/etcd/ca.crt  \
  --cert=/etc/kubernetes/pki/etcd/server.crt  \
  --key=/etc/kubernetes/pki/etcd/server.key   
  snapshot save /opt/etcd.db

/opt/etcd.db is the location where I specify to store the snapshot.

By running the backup command, you will get the following output

Backup and Restore ETCD on the Kubeadm Cluster: etcd backup command

Verify the snapshot using the command

ETCDCTL_API=3 etcdctl --write-out=table snapshot status /opt/etcd.db

You will get the following output

Backup and Restore ETCD on the Kubeadm Cluster: etcd backup file

How to Restore ETCD Backup on the Kubeadm Cluster

To restore the backup etcd snapshot run the following command

ETCDCTL_API=3 etcdctl snapshot restore /opt/etcd.db

/opt/etcd.db is the location of my snapshot, this command will restore the etcd on the default location. By running the restore command you will get the following output

Backup and Restore ETCD on the Kubeadm Cluster: etcd snapshot restore command

You can also specify the data directory where you want to restore etcd, the command to restore etcd in a specific data director is given below

ETCDCTL_API=3 etcdctl --data-dir /opt/etcd snapshot restore /opt/etcd.db

/opt/etcd is the data directory where I am restoring etcd.

Conclusion

In summary, we have learned about how to take backup and restore on Kubernetes.

I believe this blog has given a decent understanding of taking backups and restoring on Kubernetes.

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