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Etcd key-value store backup

The etcd backup procedure can be performed on any etcd node, and consists of the following steps:

1. Stop the etcd service: systemctl stop etcd
2. Create an etcd backup: etcdctl backup --data-dir /var/lib/etcd --backup-dir ~/etcd.back
3. Copy the etcd db file: cp /var/lib/etcd/member/snap/db ~/etcd/member/snap/db
4. Start the etcd service: systemtl start etcd

The etcd key-value store recovery procedure is performed on etcd nodes and consists of the following steps:

1. Create a single node cluster
2. Restore data to /var/lib/etcd/, from backup, while etcd is not running
3. Restore /etc/etcd/etcd.conf, from backup

4. Restart etcd
5. Add new nodes to the etcd cluster