Snapshots: Save & Restore

For the original commands and more information on ETCD, see https://coreos.com/etcd/docs/latest/op-guide/recovery.html.

Take a snapshot

ETCDCTL_API=3 etcdctl \
    --endpoints $ETCD_ENDPOINT \
    snapshot save snapshot.db

(where snapshot.db is the name of the snapshot file to be created)

Restore a snapshot

You must rename/remove the current data dir (probably /var/lib/etcd).

Be sure to provide all flags that are specified in, e.g., systemd unit file, Kubespray: /etc/etcd.env and others otherwise you may create issues for the ETCD cluster!

The command is looking about like that depending on what flags are used for your ETCD node:

# Run the command as `root` user after that use `chown` to correct ownership of files
ETCDCTL_API=3 etcdctl \
    snapshot restore snapshot.db \
    --name m1 \
    --initial-cluster m1=http://host1:2380,m2=http://host2:2380,m3=http://host3:2380 \
    --initial-cluster-token etcd-cluster-1 \
    --initial-advertise-peer-urls http://host1:2380
    --data-dir=/var/lib/etcd

# chown etcd:etcd -R /var/lib/etcd

This has to be done on all ETCD servers one by one with each having their own name given by flag as they were when the snapshot was taken.