22-BACKUP AND RESTORE

to take a backup of etcd use command -
export ETCDCTL_API=3
etcdctl snapshot save snapshot.db --cacert=<cert> --cert=<cert> --endpoints=[127.0.0.1:2379] --key=<server key> 
command to check the status of snapshot - etcdctl snapshot status snapshot.db
etcd data is present in dir - /var/lib/etcd
to take a backup of all resources in cluster use command - kubectl get all --all-namespaces -o yaml

restore for etcd - 
service kube-apiserver stop
export ETCDCTL_API=3
etcdctl snapshot restore snapshot.db --data-dir /var/lib/etcd-from-backup
update the data path in /etc/systemcd/etcd.service with the path mentioned in the above and run - systemctl daemon-reload
systemctl etcd restart
systemctl kube-apiserver start

reerences - 
https://kubernetes.io/docs/tasks/administer-cluster/configure-upgrade-etcd/#backing-up-an-etcd-cluster

https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/recovery.md

https://www.youtube.com/watch?v=qRPNuT080Hk