因为一个业务etcd存在单点，所以独自搭建一个集群，替换掉原来的单点，在数据同步的时候还折腾了一下，好忘性比方烂笔头!!!
一、部署一个全新的etcd集群
OLD
etcd=172.0.254.66
NEW
etcd1=172.0.254.5
etcd2=172.0.254.6
etcd3=172.0.254.7
在脚本处填写3台ETCD集群的IP，并在每台服务器执行
#!/bin/bash# 下载二进制etcd并装置version=v3.1.11downloadUrl=https://github.com/etcd-io/etcd/releases/downloadetcd1=172.0.254.5etcd2=172.0.254.6etcd3=172.0.254.7localIp=$(ip a show eth0|grep -o -P '(\d*\.){3}\d*'|head -1)if [ "$localIp" == "$etcd1" ];then etcdNum="etcd-1"elif [ "$localIp" == "$etcd2" ];then etcdNum="etcd-2"elif [ "$localIp" == "$etcd3" ];then etcdNum="etcd-3"else echo "local server ip is not etcd server:${localIp}"; exitfimkdir -p /softcurl -L ${downloadUrl}/${version}/etcd-${version}-linux-amd64.tar.gz -o /soft/etcd-${version}-linux-amd64.tar.gzcd /soft && tar -xf /soft/etcd-${version}-linux-amd64.tar.gzmv /soft/etcd-${version}-linux-amd64 /soft/etcd/soft/etcd/etcd --version/soft/etcd/etcdctl version# etcd配置文件mkdir -p /soft/etcd/confcat >/soft/etcd/conf/etcd.yml <<EOFname: $etcdNumdata-dir: /data/etcdlisten-client-urls: http://${localIp}:2379,http://127.0.0.1:2379advertise-client-urls: http://${localIp}:2379,http://127.0.0.1:2379listen-peer-urls: http://${localIp}:2380initial-advertise-peer-urls: http://${localIp}:2380initial-cluster: etcd-1=http://${etcd1}:2380,etcd-2=http://${etcd2}:2380,etcd-3=http://${etcd3}:2380initial-cluster-token: etcd-cluster-tokeninitial-cluster-state: newEOFnohup /soft/etcd/etcd --config-file=/soft/etcd/conf/etcd.yml >>/soft/etcd/stdout.out 2>&1 &ps -ef|grep etcd二、过程治理
通过一个shell脚本治理过程
vim /etc/init.d/etcd
#!/bin/bash# chkconfig: - 00 00# description: etcd manager# date=2020.11.05# 用于治理过程启动敞开查看# 启动程序文件command=/soft/etcd/etcdfunction func_getpid(){ pid=$(ps -ef | grep "$command"|grep -v "grep"|awk '{print $2}')}function func_start(){ func_getpid [ -n "$pid" ] && { echo "[start] $command is already unning,exit";exit; } nohup /soft/etcd/etcd --config-file=/soft/etcd/conf/etcd.yml >>/soft/etcd/stdout.out 2>&1 & if [ $? == 0 ];then echo "[start] suscess" else echo "[start] error" fi}function func_stop(){ func_getpid for i in ${pid[@]} do kill -9 $i || echo "[stop] error" sleep 1 && echo "[stop] $command pid:$i stoped" done}function func_status(){ func_getpid if [ ! -n "$pid" ];then echo "[check] $command is already stoped" else for i in ${pid[@]} do echo "[check] $command is running,pid is $i" done fi}function func_manager(){ case "$1" in start) func_start func_status ;; stop) func_stop func_status ;; status) func_status ;; restart) func_status func_stop func_start func_status ;; *) echo "Arguments use start|status|stop|restart" ;; esac}if [ "$#" -ne "1" ];then echo "Arguments number need eq 1" exit 1fifunc_manager $1三、迁徙
make-mirror简介
参考：https://www.mankier.com/1/etc...
make-mirror命令的字面意思是：制作一个指标etcd集群的镜像，次要用来多个etcd集群合并，但要求集群间的key不能反复，咱们是一个现有的单点迁徙到空集群，因而刚好满足
查看etcdctl make-mirror命令解释
ETCDCTL_API=3 etcdctl make-mirror [options] <destination> [flags]make-mirror Makes a mirror at the destination etcd cluster$ etcdctl make-mirror --helpNAME: make-mirror - Makes a mirror at the destination etcd clusterUSAGE: etcdctl make-mirror [options] <destination>OPTIONS: --dest-cacert="" Verify certificates of TLS enabled secure servers using this CA bundle --dest-cert="" Identify secure client using this TLS certificate file for the destination cluster --dest-insecure-transport[=true] Disable transport security for client connections --dest-key="" Identify secure client using this TLS key file --dest-prefix="" destination prefix to mirror a prefix to a different prefix in the destination cluster --no-dest-prefix[=false] mirror key-values to the root of the destination cluster --prefix="" Key-value prefix to mirrorGLOBAL OPTIONS: --cacert="" verify certificates of TLS-enabled secure servers using this CA bundle --cert="" identify secure client using this TLS certificate file --command-timeout=5s timeout for short running command (excluding dial timeout) --dial-timeout=2s dial timeout for client connections --endpoints=[127.0.0.1:2379] gRPC endpoints --hex[=false] print byte strings as hex encoded strings --insecure-skip-tls-verify[=false] skip server certificate verification --insecure-transport[=true] disable transport security for client connections --key="" identify secure client using this TLS key file --user="" username[:password] for authentication (prompt if password is not supplied) -w, --write-out="simple" set the output format (fields, json, protobuf, simple, table)同步etcd数据
在其中一台新的etcd服务器执行,例如在etcd1:172.0.254.5下面执行
ETCDCTL_API=3 etcdctl make-mirror --endpoints=http://172.0.253.66:2379 http://172.0.254.5:2379四、验证
export ETCDCTL_API=3etcdctl get --prefix --keys-only "" #查看所有key# 导出所有key的值for i in `etcdctl get --prefix --keys-only "" |sort`;do etcdctl get $i >>/tmp/etcdcheck.log;done将新老etcd集群的数据导出来比照一下键值，看看是否统一，统一则通过
注：这里只适宜小数据量比照