When Talos `controlplane` node is waiting for a bootstrap, `etcd`
contents can be recovered from a snapshot created with
`talosctl etcd snapshot` on a healthy cluster.
Bootstrap process goes same way as before, but the etcd data directory
is recovered from the snapshot.
This flow enables disaster recovery for the control plane: given that
periodic backups are available, destroy control plane nodes, re-create
them with the same config, and bootstrap one node with the saved
snapshot to recover etcd state at the time of the snapshot.
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
