一、etcdctl常用命令
1、kg po -n openshift-etcd
2、k exec -it -n openshift-etcd etcd-hdskbc02m01-002.hdskbc02.paasmgmt.cmbchina.cn /bin/sh
3、查看etcd中的所有key：etcdctl get --keys-only --from-key /
4、etcdctl get /kubernetes.io/deployments/lt81-05-vela-dev/apiserver-for-cloud
5、etcdctl get /kubernetes.io/core.oam.dev/applications/lt31-04-dev/lt31-04-fourier28-dev-dev
6、删除cr：etcdctl del /kubernetes.io/core.oam.dev/applications/lt31-04-dev/lt31-04-fourier28-dev-dev
7、删除cr：etcdctl del /kubernetes.io/core.oam.dev/resourcetrackers/lt31-04-fourier28-dev-dev-v1-lt31-04-dev
8、删除deployment：etcdctl del /kubernetes.io/deployments/za20-control/springboot20220824
9、删除cr：etcdctl del /kubernetes.io/scaler.oam.cmb/podscalers/lt31-04-dev/lt31-04-fourier28-dev-dev-fourier28-web-270519
10、整理碎片 etcdctl defrag
二、etcd删除k8s资源
etcdctl直接删除application时， deployment、rt等不会被删除，可以通过再次部署appfile把application直接恢复出来；
etcdctl直接删除deployment时，rs和pod会被级联删除；
etcdctl直接删除某种资源会有delete event产生，但是也需要控制器单独处理这种delete event才能做到级联删除。
三、etcd数据备份
备份：etcdctl snapshot save snapshot.db --debug
恢复：etcdctl snapshot restore snapshot.db
