Add ability to perform an etcd on-demand snapshot via cli (#2819)

* add ability to perform an etcd on-demand snapshot via cli

(cherry picked from commit 13229019f8)
Signed-off-by: Brian Downs <brian.downs@gmail.com>

pkg/cli/cmds/server.go

@@ -64,6 +64,7 @@ type Server struct {
 	ClusterResetRestorePath  string
 	EncryptSecrets           bool
 	StartupHooks             []func(context.Context, <-chan struct{}, string) error
+	EtcdSnapshotName         string
 	EtcdDisableSnapshots     bool
 	EtcdSnapshotDir          string
 	EtcdSnapshotCron         string
@@ -220,6 +221,12 @@ func NewServerCommand(action func(*cli.Context) error) cli.Command {
 				Usage:       "(db) Disable automatic etcd snapshots",
 				Destination: &ServerConfig.EtcdDisableSnapshots,
 			},
+			&cli.StringFlag{
+				Name:        "etcd-snapshot-name",
+				Usage:       "(db) Set the base name of etcd snapshots. Default: etcd-snapshot-<unix-timestamp>",
+				Destination: &ServerConfig.EtcdSnapshotName,
+				Value:       "etcd-snapshot",
+			},
 			&cli.StringFlag{
 				Name:        "etcd-snapshot-schedule-cron",
 				Usage:       "(db) Snapshot interval time in cron spec. eg. every 5 hours '* */5 * * *'",