K8S+DevOps架构师实战课 | ETCD常用操作

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拷贝etcdctl命令行工具：

$ docker exec -ti  etcd_container which etcdctl
$ docker cp etcd_container:/usr/local/bin/etcdctl /usr/bin/etcdctl

查看etcd集群的成员节点：

$ export ETCDCTL_API=3 
$ etcdctl --endpoints=https://127.0.0.1:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key member list -w table

$ alias etcdctl='etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key'

$ etcdctl member list -w table

查看etcd集群节点状态：

$ etcdctl endpoint status -w table

$ etcdctl endpoint health -w table

设置key值:

$ etcdctl put luffy 1
$ etcdctl get luffy

查看所有key值：

$  etcdctl get / --prefix --keys-only

查看具体的key对应的数据：

$ etcdctl get /registry/pods/jenkins/sonar-postgres-7fc5d748b6-gtmsb

添加定时任务做数据快照（重要！）

$ etcdctl snapshot save `hostname`-etcd_`date +%Y%m%d%H%M`.db

恢复快照：

1. 停止etcd和apiserver
2. 移走当前数据目录

$ mv /var/lib/etcd/ /tmp

3. 恢复快照

$ etcdctl snapshot restore `hostname`-etcd_`date +%Y%m%d%H%M`.db --data-dir=/var/lib/etcd/

4. 集群恢复

https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/recovery.md