Etcd集群配置

服务器环境：

ip	client_port	peer_port
10.20.48.107	2379	2380
10.20.48.108	2379	2380
10.20.48.109	2379	2380

安装etcd：
安装比较简单，我们只需要去官方下载包就可以

wget https://github.com/coreos/etcd/releases/download/v3.1.11/etcd-v3.1.11-linux-amd64.tar.gz
tar zxvf etcd-v3.1.11-linux-amd64.tar.gz -C /usr/local/
在/usr/local/ 目录下 mv etcd-v3.1.11-linux-amd64.tar.gz etcdv3
ln -s /usr/local/etcdv3/etcd* /usr/local/bin/
在/etc/profile中添加环境变量export ETCDCTL_API=3

配置说明：

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name: initial-advertise-peer-urls: #该成员的对等url列表，用于向集群的其他成员通告（告诉其他成员通过什么url和我通信）listen-peer-urls:	# 本地监听，接收同等节点请求的端口listen-client-urls:  # 本地监听，接受客户端请求的端口advertise-client-urls: # 该成员的客户端url的列表，用于向所有人通告（告知所有人client访问我的哪儿）initial-cluster-token:  # 集群唯一令牌，识别不同的集群initial-cluster: # 集群的成员，name是前面指定nameinitial-cluster-state: # 初始集群的状态，有“new,existing”data-dir: # 数据存储的目录

配置文件：
我们通过配置文件的方式启动
etcd1：

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name: "etcd1"initial-advertise-peer-urls: "http://10.20.48.107:2380"listen-peer-urls: "http://10.20.48.107:2380"listen-client-urls: "http://10.20.48.107:2379,http://127.0.0.1:2379"advertise-client-urls: "http://10.20.48.107:2379"initial-cluster-token: "heyhey-etcd"initial-cluster: "etcd1=http://10.20.48.107:2380,etcd2=http://10.20.48.108:2380,etcd3=http://10.20.48.109:2380"initial-cluster-state: "new"data-dir: "/home/qqdz/etcd/etcd1"

etcd2：

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name: "etcd2"initial-advertise-peer-urls: "http://10.20.48.108:2380"listen-peer-urls: "http://10.20.48.108:2380"listen-client-urls: "http://10.20.48.108:2379,http://127.0.0.1:2379"advertise-client-urls: "http://10.20.48.108:2379"initial-cluster-token: "heyhey-etcd"initial-cluster: "etcd1=http://10.20.48.107:2380,etcd2=http://10.20.48.108:2380,etcd3=http://10.20.48.109:2380"initial-cluster-state: "new"data-dir: "/home/qqdz/etcd/etcd2"

etcd3：

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name: "etcd3"initial-advertise-peer-urls: "http://10.20.48.109:2380"listen-peer-urls: "http://10.20.48.109:2380"listen-client-urls: "http://10.20.48.109:2379,http://127.0.0.1:2379"advertise-client-urls: "http://10.20.48.109:2379"initial-cluster-token: "heyhey-etcd"initial-cluster: "etcd1=http://10.20.48.107:2380,etcd2=http://10.20.48.108:2380,etcd3=http://10.20.48.109:2380"initial-cluster-state: "new"data-dir: "/home/qqdz/etcd/etcd3"

启动脚本：

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startwork(){        nohup /usr/local/bin/etcd --config-file /home/qqdz/etcd/etcd.yml  &         echo "ps x | grep "etcd""        ps x|grep "etcd"   }stopwork(){        SERVERLIST='etcd'        for serv in $SERVERLIST        do                echo "stop $serv"                ps aux|grep "/$serv"|sed -e "/grep/d"|awk '{print $2}'|xargs kill 2&>/dev/null                sleep 1        done    while test -f run.sh    do        count=`ps x|grep "etcd-c"|sed -e '/grep/d'|wc -l`        echo "running server:"$count        if [ $count -eq 0 ]; then            break        fi        sleep 1    done}echo "-------------------start-----------------------"case $1 instop)    stopwork;;start)    startwork;;*)    stopwork    sleep 1    startwork;;esacecho "-------------------end-----------------------"

常用命令：
获取etcd所有的keys
ETCDCTL_API=3 etcdctl get "" --prefix=true
ETCDCTL_API=3 etcdctl get "" --from-key

查看集群状态
在.bash_profile中添加下面语句，这样每次登录都会自动加载变量
ENDPOINTS=10.20.48.107:2379,10.20.48.108:2379,10.20.48.109:2379
export ENDPOINTS

通过下面命令查看集群状态：
etcdctl --write-out=table --endpoints=$ENDPOINTS endpoint status

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[ ~]$ etcdctl --write-out=table --endpoints=$ENDPOINTS endpoint status     +-------------------+------------------+---------+---------+-----------+-----------+------------+|     ENDPOINT      |        ID        | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |+-------------------+------------------+---------+---------+-----------+-----------+------------+| 10.20.48.107:2379 | 40c1a9f933c13188 | 3.1.11  | 33 kB   | true      |       176 |         41 || 10.20.48.108:2379 | c0598886ee4f3484 | 3.1.11  | 33 kB   | false     |       176 |         41 || 10.20.48.109:2379 | 3837344de92ee822 | 3.1.11  | 33 kB   | false     |       176 |         41 |+-------------------+------------------+---------+---------+-----------+-----------+------------+

通过下面命令查看健康状态：
etcdctl --write-out=table --endpoints=$ENDPOINTS endpoint health

[ ~]$ etcdctl --endpoints=$ENDPOINTS endpoint health                10.20.48.107:2379 is healthy: successfully committed proposal: took = 1.249516ms10.20.48.109:2379 is healthy: successfully committed proposal: took = 1.415811ms10.20.48.108:2379 is healthy: successfully committed proposal: took = 1.487734ms

启动Etcd网关：
etcd gateway start --endpoints=10.20.48.107:2379,10.20.48.108:2379,10.20.48.109:2379 --listen-addr="127.0.0.1:23790"

资料：
Etcd交互
 Etcd–config-file配置模板
 Etcd配置说明

Etcd集群配置

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