etcd record commonly used commands
1. Check the version of etcd
2. Check prometheus indicators etcd exposed; the monitoring of its use in prometheus
3. Check the cluster members etcd
4. Review the health status of the cluster etcd
The backup the entire data directory ETCD; the default directory for data / var / lib / etcd /
6. etcd snapshot backup
7. snapshot recovery etcd clusters; (each node needs to perform)