using etcdctl to access kuberentes data
Jimmy Song
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commit
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@ -48,6 +48,7 @@
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- [docker用户过度到kubectl命令行指南](guide/docker-cli-to-kubectl.md)
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- [kubectl命令概览](guide/using-kubectl.md)
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- [kubectl命令技巧大全](guide/kubectl-cheatsheet.md)
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- [使用etcdctl访问kuberentes数据](guide/using-etcdctl-to-access-kubernetes-data.md)
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- [集群安全性管理](guide/cluster-security-management.md)
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- [管理集群中的TLS](guide/managing-tls-in-a-cluster.md)
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- [kubelet的认证授权](guide/kubelet-authentication-authorization.md)
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@ -134,6 +135,7 @@
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- [Spark standalone on Kubernetes](usecases/spark-standalone-on-kubernetes.md)
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- [运行支持kubernetes原生调度的Spark程序](usecases/running-spark-with-kubernetes-native-scheduler.md)
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- [Serverless架构](usecases/serverless.md)
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- [理解Serverless](usecases/understanding-serverless.md)
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- [边缘计算](usecases/edge-computing.md)
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### 开发指南
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@ -0,0 +1,122 @@
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# 使用etcdctl访问kuberentes数据
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Kubenretes1.6中使用etcd V3版本的API，使用`etcdctl`直接`ls`的话只能看到`/kube-centos`一个路径。需要在命令前加上`ETCDCTL_API=3`这个环境变量才能看到kuberentes在etcd中保存的数据。
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```bash
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ETCDCTL_API=3 etcdctl get /registry/namespaces/default -w=json|python -m json.tool
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```
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- `-w`指定输出格式
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将得到这样的json的结果：
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```json
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{
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"count": 1,
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"header": {
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"cluster_id": 12091028579527406772,
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"member_id": 16557816780141026208,
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"raft_term": 36,
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"revision": 29253467
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},
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"kvs": [
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{
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"create_revision": 5,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMvZGVmYXVsdA==",
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"mod_revision": 5,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEmIKSAoHZGVmYXVsdBIAGgAiACokZTU2YzMzMDgtMWVhOC0xMWU3LThjZDctZjRlOWQ0OWY4ZWQwMgA4AEILCIn4sscFEKOg9xd6ABIMCgprdWJlcm5ldGVzGggKBkFjdGl2ZRoAIgA=",
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"version": 1
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}
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]
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}
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```
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使用`--prefix`可以看到所有的子目录，如查看集群中的namespace：
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```bash
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ETCDCTL_API=3 etcdctl get /registry/namespaces --prefix -w=json|python -m json.tool
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```
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输出结果中可以看到所有的namespace。
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```bash
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{
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"count": 8,
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"header": {
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"cluster_id": 12091028579527406772,
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"member_id": 16557816780141026208,
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"raft_term": 36,
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"revision": 29253722
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},
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"kvs": [
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{
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"create_revision": 24310883,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMvYXV0b21vZGVs",
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"mod_revision": 24310883,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEmQKSgoJYXV0b21vZGVsEgAaACIAKiQ1MjczOTU1ZC1iMzEyLTExZTctOTcwYy1mNGU5ZDQ5ZjhlZDAyADgAQgsI7fSWzwUQ6Jv1Z3oAEgwKCmt1YmVybmV0ZXMaCAoGQWN0aXZlGgAiAA==",
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"version": 1
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},
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{
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"create_revision": 21387676,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMvYnJhbmQ=",
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"mod_revision": 21387676,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEmEKRwoFYnJhbmQSABoAIgAqJGNkZmQ1Y2NmLWExYzktMTFlNy05NzBjLWY0ZTlkNDlmOGVkMDIAOABCDAjR9qLOBRDYn83XAXoAEgwKCmt1YmVybmV0ZXMaCAoGQWN0aXZlGgAiAA==",
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"version": 1
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},
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{
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"create_revision": 5,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMvZGVmYXVsdA==",
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"mod_revision": 5,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEmIKSAoHZGVmYXVsdBIAGgAiACokZTU2YzMzMDgtMWVhOC0xMWU3LThjZDctZjRlOWQ0OWY4ZWQwMgA4AEILCIn4sscFEKOg9xd6ABIMCgprdWJlcm5ldGVzGggKBkFjdGl2ZRoAIgA=",
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"version": 1
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},
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{
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"create_revision": 18504694,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMvZGV2",
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"mod_revision": 24310213,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEmwKUgoDZGV2EgAaACIAKiQyOGRlMGVjNS04ZTEzLTExZTctOTcwYy1mNGU5ZDQ5ZjhlZDAyADgAQgwI89CezQUQ0v2fuQNaCwoEbmFtZRIDZGV2egASDAoKa3ViZXJuZXRlcxoICgZBY3RpdmUaACIA",
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"version": 4
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},
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{
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"create_revision": 10,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMva3ViZS1wdWJsaWM=",
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"mod_revision": 10,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEmcKTQoLa3ViZS1wdWJsaWMSABoAIgAqJGU1ZjhkY2I1LTFlYTgtMTFlNy04Y2Q3LWY0ZTlkNDlmOGVkMDIAOABCDAiJ+LLHBRDdrsDPA3oAEgwKCmt1YmVybmV0ZXMaCAoGQWN0aXZlGgAiAA==",
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"version": 1
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},
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{
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"create_revision": 2,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMva3ViZS1zeXN0ZW0=",
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"mod_revision": 2,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEmYKTAoLa3ViZS1zeXN0ZW0SABoAIgAqJGU1NmFhMDVkLTFlYTgtMTFlNy04Y2Q3LWY0ZTlkNDlmOGVkMDIAOABCCwiJ+LLHBRDoq9ASegASDAoKa3ViZXJuZXRlcxoICgZBY3RpdmUaACIA",
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"version": 1
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},
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{
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"create_revision": 3774247,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMvc3BhcmstY2x1c3Rlcg==",
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"mod_revision": 3774247,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEoABCmYKDXNwYXJrLWNsdXN0ZXISABoAIgAqJDMyNjY3ZDVjLTM0YWMtMTFlNy1iZmJkLThhZjFlM2E3YzViZDIAOABCDAiA1cbIBRDU3YuAAVoVCgRuYW1lEg1zcGFyay1jbHVzdGVyegASDAoKa3ViZXJuZXRlcxoICgZBY3RpdmUaACIA",
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"version": 1
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},
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{
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"create_revision": 15212191,
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"key": "L3JlZ2lzdHJ5L25hbWVzcGFjZXMveWFybi1jbHVzdGVy",
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"mod_revision": 15212191,
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"value": "azhzAAoPCgJ2MRIJTmFtZXNwYWNlEn0KYwoMeWFybi1jbHVzdGVyEgAaACIAKiQ2YWNhNjk1Yi03N2Y5LTExZTctYmZiZC04YWYxZTNhN2M1YmQyADgAQgsI1qiKzAUQkoqxDloUCgRuYW1lEgx5YXJuLWNsdXN0ZXJ6ABIMCgprdWJlcm5ldGVzGggKBkFjdGl2ZRoAIgA=",
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"version": 1
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}
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]
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}
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```
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key的值是经过base64编码，需要解码后才能看到实际值，如：
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```bash
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$ echo L3JlZ2lzdHJ5L25hbWVzcGFjZXMvYXV0b21vZGVs|base64 -d
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/registry/namespaces/automodel
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```
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## 参考
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- [etcd中文文档](https://github.com/doczhcn/etcd)
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- [etcd官方文档](https://coreos.com/etcd/docs/latest/)
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@ -121,3 +121,6 @@ cluster is healthy
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```
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结果最后一行为 `cluster is healthy` 时表示集群服务正常。
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关于如何在etcd中查看kubernetes的数据，请参考[使用etcdctl访问kuberentes数据](../guide/using-etcdctl-to-access-kubernetes-data.md)。
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