etcd安装：
mkdir -pv etcd-download-test
tar -zxvf etcd-v3.4.4-linux-amd64.tar.gz -C etcd-download-test/
编辑修改系统环境变量 /etc/profile
export ETCD_HOME=/tmp/etcd-download-test/etcd-v3.4.4-linux-amd64
export PATH=$PATH:$JAVA_HOME/bin:$ETCD_HOME/
source /etc/profile
备份ETCD数据库
ETCDCTL_API=3 etcdctl --cert /etc/kubernetes/pki/etcd/peer.crt --key /etc/kubernetes/pki/etcd/peer.key --cacert /etc/kubernetes/pki/etcd/ca.crt --endpoints https://127.0.0.1:2379 snapshot save /data/backup/etcd-snapshot.db
Snapshot saved at /data/backup/etcd-snapshot.db
查看etcd 成员信息
ETCDCTL_API=3 etcdctl --cert /etc/kubernetes/pki/etcd/peer.crt --key /etc/kubernetes/pki/etcd/peer.key --cacert /etc/kubernetes/pki/etcd/ca.crt --endpoints https://127.0.0.1:2379 member list
etcd 恢复
ETCDCTL_API=3 etcdctl --endpoints="https://127.0.0.1:2379" --cert /etc/kubernetes/pki/etcd/peer.crt --key /etc/kubernetes/pki/etcd/peer.key --cacert /etc/kubernetes/pki/etcd/ca.crt snapshot restore /data/backup/etcd-snapshot.db --data-dir=/var/lib/etcd