etcd

官方下载:
https://github.com/etcd-io/etcd/releases

+----------------------------------------------------------+          
| Master                                                   |          
|              +-------------------------+                 |          
|     +------->|        API Server       |<--------+       |          
|     |        |                         |         |       |          
|     v        +-------------------------+         v       |          
|   +----------------+     ^      +--------------------+   |          
|   |                |     |      |                    |   |          
|   |   Scheduler    |     |      | Controller Manager |   |          
|   |                |     |      |                    |   |          
|   +----------------+     v      +--------------------+   |          
| +------------------------------------------------------+ |          
| |                                                      | |          
| |                Cluster state store                   | |          
| |                                                      | |          
| +------------------------------------------------------+ |          
+----------------------------------------------------------+

进入 etcd 的 pod

kubectl -n kube-system exec -it etcd-master sh

传递证书等相关参数，查看 member:

ETCDCTL_API=3 etcdctl --key=/etc/kubernetes/pki/etcd/server.key  --cert=/etc/kubernetes/pki/etcd/server.crt  --cacert=/etc/kubernetes/pki/etcd/ca.crt member list

查看存储的元信息:

ETCDCTL_API=3 etcdctl --key=/etc/kubernetes/pki/etcd/server.key  --cert=/etc/kubernetes/pki/etcd/server.crt  --cacert=/etc/kubernetes/pki/etcd/ca.crt get /registry --prefix --keys-only

查看 Namespaces 信息

ETCDCTL_API=3 etcdctl --key=/etc/kubernetes/pki/etcd/server.key  --cert=/etc/kubernetes/pki/etcd/server.crt  --cacert=/etc/kubernetes/pki/etcd/ca.crt get /registry/namespaces --prefix --keys-only

参考资料:

https://etcd.readthedocs.io/en/latest/faq.html#what-is-etcd