图解Kubernetes中的etcd的访问

目录

文章目录

前言

一、etcd是什么？

二、使用步骤

1.在k8s查看安装好的etcd

​2.进入k8s的etcd

3.指定etcd的版本3​

4.查看集群所有节点（etcdctl member list）​

5.写入测试数据（etcdctl put /testdir/testkey "Hello world1"）

6.读出测试数据（etcdctl get /testdir/testkey）

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总结

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前言

Kubernetes中的etcd访问。

正常安装了k8s，没有特意去安装etcd，利用K8s中附带的etcd，感受一下etcd的读写操作。

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提示：以下是本篇文章正文内容，下面案例可供参考

一、etcd是什么？

etcd是一个分布式的key-value存储数据库。

二、使用步骤

1.在k8s查看安装好的etcd

kubectl get pod -n kube-system | grep etcd

2.进入k8s的etcd

kubectl exec -ti etcd-s205  -n kube-system  -- /bin/sh

etcd-s205 是etcd的pod的名字，

kube-system是etcd所在的命名空间

 3.指定etcd的版本3

export ETCDCTL_API=3

4.查看集群所有节点（etcdctl member list）

 本来命令是etcdctl member list，会出错，

"level":"warn","ts":"2022-01-23T07:20:36.684Z","caller":"clientv3/retry_interceptor.go:62","msg":"retrying of unary invoker failed","target":"endpoint://client-f4a0c47f-bfc5-4e20-938f-fd9f60be32fd/127.0.0.1:2379","attempt":0,"error":"rpc error: code = DeadlineExceeded desc = latest balancer error: all SubConns are in TransientFailure, latest connection error: connection closed"}
Error: context deadline exceeded

"level":"warn","ts":"2022-01-23T07:20:36.684Z","caller":"clientv3/retry_interceptor.go:62","msg":"retrying of unary invoker failed","target":"endpoint://client-f4a0c47f-bfc5-4e20-938f-fd9f60be32fd/127.0.0.1:2379","attempt":0,"error":"rpc error: code = DeadlineExceeded desc = latest balancer error: all SubConns are in TransientFailure, latest connection error: connection closed"}
Error: context deadline exceeded

为了需要带上证书参数访问，

增加了证书参数

  --cacert=/etc/kubernetes/pki/etcd/ca.crt

  --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt

  --key=/etc/kubernetes/pki/etcd/healthcheck-client.key

etcdctl --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

5.写入测试数据（etcdctl put /testdir/testkey "Hello world1"）

etcdctl --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key put /testdir/testkey "Hello world1"

6.读出测试数据（etcdctl get /testdir/testkey）

etcdctl --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key get /testdir/testkey

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总结

k8s中的etcd，加上证书参数后，就可以直接测试学习用了。