1 下载安装 etcdctl 客户端命令工具

1.1 使用脚本下载与服务端相同版本的 etcdctl 软件包

[shutang@centos03.com etcd]$ pwd

/home/shutang/k8s/etcd

[shutang@centos03.com etcd]$ ls

download.sh

[shutang@centos03.com etcd]$ cat download.sh

#!/bin/bash

ETCD_VER=v3.4.3

ETCD_DIR=etcd-download

DOWNLOAD_URL=https://github.com/coreos/etcd/releases/download

# Download

mkdir ${ETCD_DIR}

cd ${ETCD_DIR}

wget ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz

tar -xzvf etcd-${ETCD_VER}-linux-amd64.tar.gz

# install

cd etcd-${ETCD_VER}-linux-amd64

cp etcdctl /usr/local/bin/

1.2 执行脚本，然后配置环境变量和别名

[shutang@centos03.com etcd] bash download.sh
# 创建该文件

[shutang@centos03.com profile.d]$ cat etcd.sh

export ETCDCTL_API=3

alias etcdctl='etcdctl --endpoints=https://centos01.com:2379,https://centos02.com:2379,https://centos03.com:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key'

[shutang@centos03.com profile.d]$ source etcd.sh

# 这里需要注意要保证两个证书文件和一个私钥文件具有可读权限，以便普通用户可以使用 etcdctl 命令

2 普通用户可以使用 etcdctl 命令

2.1 查看 etcd 集群成员列表

[shutang@centos03.com profile.d]$ etcdctl member list

fw57bbcfbe9bc95, started, centos03.com, https://192.168.0.100:2380, https://192.168.0.100:2379, false

ds8968b39130b7a, started, centos02.com, https://192.168.0.101:2380, https://192.168.0.101:2379, false

fs663af9b5wfr85, started, centos01.com, https://192.168.0.102:2380, https://192.168.0.102:2379, false

2.2 查看 endpoints 状态

[shutang@centos03.com profile.d]$ etcdctl endpoint status --write-out=table

+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |

+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

| https://centos03.com:2379 | fw57bbcfbe9bc95 | 3.4.3 | 36 MB | true | false | 4 | 8387884 | 8387884 | |

| https://centos03.com:2379 | ds8968b39130b7a | 3.4.3 | 36 MB | false | false | 4 | 8387884 | 8387884 | |

| https://centos03.com:2379 | fs663af9b5wfr85 | 3.4.3 | 36 MB | false | false | 4 | 8387884 | 8387884 | |

+------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

2.3 查看 etcd endpoints 的健康

[shutang@centos03.com profile.d]$ etcdctl endpoint health

https://centos03.com:2379 is healthy: successfully committed proposal: took = 12.253777ms

https://centos02.com:2379 is healthy: successfully committed proposal: took = 13.902653ms

https://centos01.com:2379 is healthy: successfully committed proposal: took = 15.32191ms