命令行太長了，不容易記住，使用alias命令用來設置指令的別名。
~~~
alias etcdctl="ETCDCTL_API=3 /usr/local/bin/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"
~~~
1\. 查看所有etcd的所有key，執行以下命令：
~~~
root@k8s-master:~# etcdctl get / --prefix --keys-only。。。
/registry/services/specs/kube-system/kube-dns
/registry/services/specs/kube-system/tiller-deploy
/registry/services/specs/manually/sleep/registry/validatingwebhookconfigurations/istio-galley
root@k8s-master:~#
~~~
2\. 查看指定key的內容，如果您的系統用的是flannel網絡插件，可以執行以下命令查看相關數據：
~~~
root@k8s-master:~# etcdctl get /registry/configmaps/kube-system/kube-flannel-cfg/registry/configmaps/kube-system/kube-flannel-cfgk8s v1 ConfigMap ? kube-flannel-cfg kube-system"*$2a0899cc-5dd7-42d6-9302-dbda856997532?ZappflannelZtiernodeb20kubectl.kubernetes.io/last-applied-configuration??iVersion":"v1","data":{"cni-conf.json":"{\n \"name\": \"cbr0\",\n \"cniVersion\": \"0.3.1\",\n \"plugins\": [\n {\n \"type\": \"flannel\",\n \"delegate\": {\n \"hairpinMode\": true,\n \"isDefaultGateway\": true\n }\n },\n {\n \"type\": \"portmap\",\n \"capabilities\": {\n \"portMappings\": true\n }\n }\n ]\n}\n","net-conf.json":"{\n \"Network\": \"10.244.0.0/16\",\n \"Backend\": {\n \"Type\": \"vxlan\"\n }\n}\n"},"kind":"ConfigMap","metadata":{"annotations":{},"labels":{"app":"flannel","tier":"node"},"name":"kube-flannel-cfg","namespace":"kube-system"}}z? cni-conf.json¤{ "name": "cbr0", "cniVersion": "0.3.1", "plugins": [ { "type": "flannel", "delegate": { "hairpinMode": true, "isDefaultGateway": true } }, { "type": "portmap", "capabilities": { "portMappings": true } } ]}Znet-conf.jsonI{ "Network": "10.244.0.0/16", "Backend": { "Type": "vxlan" }}"XshellXshellroot@k8s-master:~#
~~~
如上所示，有少量不可見字符，這是因為etcd中存儲的并不是json的原文，而是protocol buffer序列化后的數據，不過還是有部分內容是可讀的；
3\. 查看節點信息，如下所示，當前環境有master和node0兩個節點：
~~~
root@k8s-master:~# etcdctl get /registry/minions/ --prefix --keys-only/registry/minions/k8s-master/registry/minions/k8s-node root@k8s-master:~#
~~~
1. 執行以下命令可以查看node0節點的信息，由于結果中有很多序列化之后的不可讀字符，就不把結果貼出來了：
~~~
etcdctl get /registry/minions/k8s-node
~~~
## etcd中的key及其含義
