1、etcdctl常用操作

etcdctl官方文档链接：https://github.com/etcd-io/etcd/tree/main/etcdctl

为了简化操作，需先声明与证书相关的环境变量，登录其中一台控制节点操作即可：

export ETCDCTL_CACERT=/etc/ssl/etcd/ssl/ca.pem
export ETCDCTL_CERT=/etc/ssl/etcd/ssl/admin-controller-xx.pem
export ETCDCTL_KEY=/etc/ssl/etcd/ssl/admin-controller-xx-key.pem

获取指定的key的值

etcdctl get /registry/configmaps/default/application-progress

仅获取key(模糊匹配)

etcdctl get --prefix '/registry/leases/'  --keys-only

仅获取所有的key

etcdctl get --from-key '' --keys-only

2、etcd数据备份与恢复

从快照恢复数据

etcdctl snapshot restore /tmp/db \
  --data-dir=/var/lib/etcd \
  --name etcd1 \
  --initial-cluster etcd1=http://1.1.1.1:2380 \
  --initial-cluster-token k8s_etcd \
  --initial-advertise-peer-urls http://1.1.1.1:2380 \
  --skip-hash-check=true