etcd学习(4)-centos7中部署etcd - Rick.lz - D1h.Net第一号博客
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etcd学习(4)-centos7中部署etcd

etcd的搭建

前言

这里记录下如何搭建etcd

单机

在etcd的releases中有安装脚本,安装脚本

这里放一个docker的安装脚本

rm -rf /tmp/etcd-data.tmp && mkdir -p /tmp/etcd-data.tmp && \ docker rmi quay.io/coreos/etcd:v3.5.0 || true && \ docker run \ -p 2379:2379 \ -p 2380:2380 \ --mount type=bind,source=/tmp/etcd-data.tmp,destination=/etcd-data \ --name etcd-gcr-v3.5.0 \ quay.io/coreos/etcd:v3.5.0 \ /usr/local/bin/etcd \ --name s1 \ --data-dir /etcd-data \ --listen-client-urls http://0.0.0.0:2379 \ --advertise-client-urls http://0.0.0.0:2379 \ --listen-peer-urls http://0.0.0.0:2380 \ --initial-advertise-peer-urls http://0.0.0.0:2380 \ --initial-cluster s1=http://0.0.0.0:2380 \ --initial-cluster-token tkn \ --initial-cluster-state new \ --log-level info \ --logger zap \ --log-outputs stderr 

集群

这里准备了三台centos7机器

主机 ip
etcd-1 192.168.56.111
etcd-2 192.168.56.112
etcd-3 192.168.56.113

首先在每台机器中安装etcd,这里写了安装的脚本

$ cat etcd.sh ETCD_VER=v3.5.0 # choose either URL GOOGLE_URL=https://storage.googleapis.com/etcd GITHUB_URL=https://github.com/etcd-io/etcd/releases/download DOWNLOAD_URL=${GITHUB_URL} rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz rm -rf /opt/etcd && mkdir -p /opt/etcd curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz tar xzvf /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz -C /opt/etcd --strip-components=1 rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz 

赋予执行权限

$ chmod +x etcd.sh 

在每台机器中都执行下

$ ./etcd.sh % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 636 100 636 0 0 1328 0 --:--:-- --:--:-- --:--:-- 1330 100 18.4M 100 18.4M 0 0 717k 0 0:00:26 0:00:26 --:--:-- 775k ... 

创建etcd配置文件

$ mkdir /etc/etcd $ vi /etc/etcd/conf.yml 

节点1

name: etcd-1 data-dir: /opt/etcd/data listen-client-urls: http://192.168.56.111:2379,http://127.0.0.1:2379 advertise-client-urls: http://192.168.56.111:2379,http://127.0.0.1:2379 listen-peer-urls: http://192.168.56.111:2380 initial-advertise-peer-urls: http://192.168.56.111:2380 initial-cluster: etcd-1=http://192.168.56.111:2380,etcd-2=http://192.168.56.112:2380,etcd-3=http://192.168.56.113:2380 initial-cluster-token: etcd-cluster-token initial-cluster-state: new 

节点2

name: etcd-2 data-dir: /opt/etcd/data listen-client-urls: http://192.168.56.112:2379,http://127.0.0.1:2379 advertise-client-urls: http://192.168.56.112:2379,http://127.0.0.1:2379 listen-peer-urls: http://192.168.56.112:2380 initial-advertise-peer-urls: http://192.168.56.112:2380 initial-cluster: etcd-1=http://192.168.56.111:2380,etcd-2=http://192.168.56.112:2380,etcd-3=http://192.168.56.113:2380 initial-cluster-token: etcd-cluster-token initial-cluster-state: new 

节点3

name: etcd-3 data-dir: /opt/etcd/data listen-client-urls: http://192.168.56.113:2379,http://127.0.0.1:2379 advertise-client-urls: http://192.168.56.113:2379,http://127.0.0.1:2379 listen-peer-urls: http://192.168.56.113:2380 initial-advertise-peer-urls: http://192.168.56.113:2380 initial-cluster: etcd-1=http://192.168.56.111:2380,etcd-2=http://192.168.56.112:2380,etcd-3=http://192.168.56.113:2380 initial-cluster-token: etcd-cluster-token initial-cluster-state: new 

配置项说明:

  • --name:etcd集群中的节点名,这里可以随意,可区分且不重复就行

  • --listen-peer-urls:监听的用于节点之间通信的url,可监听多个,集群内部将通过这些url进行数据交互(如选举,数据同步等)

  • --initial-advertise-peer-urls:建议用于节点之间通信的url,节点间将以该值进行通信

  • --listen-client-urls:监听的用于客户端通信的url,同样可以监听多个

  • --advertise-client-urls:建议使用的客户端通信 url,该值用于 etcd 代理或 etcd 成员与 etcd 节点通信

  • --initial-cluster-token: etcd-cluster-1,节点的 token 值,设置该值后集群将生成唯一 id,并为每个节点也生成唯一 id,当使用相同配置文件再启动一个集群时,只要该 token 值不一样,etcd 集群就不会相互影响

  • --initial-cluster:也就是集群中所有的 initial-advertise-peer-urls 的合集

  • --initial-cluster-state:new,新建集群的标志

更新etcd系统默认配置

当前使用的是etcd v3版本,系统默认的是v2,通过下面命令修改配置。

$ vi /etc/profile # 在末尾追加 export ETCDCTL_API=3 # 然后更新 $ source /etc/profile 

启动

$ ./etcd --config-file=/etc/etcd/conf.yml 

配置ETCD为启动服务

编辑/usr/lib/systemd/system/etcd.service

$ cat /usr/lib/systemd/system/etcd.service [Unit] Description=EtcdServer After=network.target After=network-online.target Wants=network-online.target [Service] Type=notify WorkingDirectory=/opt/etcd/ # User=etcd ExecStart=/opt/etcd/etcd --config-file=/etc/etcd/conf.yml Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target 

更新启动:

$ systemctl daemon-reload $ systemctl enable etcd $ systemctl start etcd $ systemctl restart etcd $ systemctl status etcd.service -l 

测试下

复制etcd二进制文件到/usr/local/bin/

$ cp /opt/etcd/etcd* /usr/local/bin/ 

首先设置ETCD_ENDPOINTS

# export ETCDCTL_API=3 # export ETCD_ENDPOINTS=192.168.56.111:2379,192.168.56.112:2379,192.168.56.113:2379 

查看状态

$ etcdctl --endpoints=${ETCD_ENDPOINTS} --write-out=table member list +------------------+---------+--------+----------------------------+--------------------------------------------------+------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+--------+----------------------------+--------------------------------------------------+------------+ | 90d224ceb3098d7 | started | etcd-2 | http://192.168.56.112:2380 | http://127.0.0.1:2379,http://192.168.56.112:2379 | false | | 3b23fbb7d9c7cd10 | started | etcd-1 | http://192.168.56.111:2380 | http://127.0.0.1:2379,http://192.168.56.111:2379 | false | | 7909c74e3f5ffafa | started | etcd-3 | http://192.168.56.113:2380 | http://127.0.0.1:2379,http://192.168.56.113:2379 | false | +------------------+---------+--------+----------------------------+--------------------------------------------------+------------+ $ etcdctl --endpoints=${ETCD_ENDPOINTS} --write-out=table endpoint health +---------------------+--------+------------+-------+ | ENDPOINT | HEALTH | TOOK | ERROR | +---------------------+--------+------------+-------+ | 192.168.56.111:2379 | true | 6.558088ms | | | 192.168.56.113:2379 | true | 6.543104ms | | | 192.168.56.112:2379 | true | 7.405801ms | | +---------------------+--------+------------+-------+ $ etcdctl --endpoints=${ETCD_ENDPOINTS} --write-out=table endpoint status +---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ | ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS | +---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ | 192.168.56.111:2379 | 3b23fbb7d9c7cd10 | 3.5.0 | 20 kB | true | false | 2 | 19 | 19 | | | 192.168.56.112:2379 | 90d224ceb3098d7 | 3.5.0 | 20 kB | false | false | 2 | 19 | 19 | | | 192.168.56.113:2379 | 7909c74e3f5ffafa | 3.5.0 | 20 kB | false | false | 2 | 19 | 19 | | +---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+ 

在etcd-1中watch一个key,然后再etcd-2中对key设置一个值

[root@centos7-1 ~]# etcdctl watch test PUT test xiaoming [root@centos7-3 ~]# etcdctl put test xiaoming OK 

参考

【ETCD集群安装配置】https://zhuanlan.zhihu.com/p/46477992
【Install】https://etcd.io/docs/v3.5/install/
【彻底搞懂 etcd 系列文章(三):etcd 集群运维部署】https://developer.aliyun.com/article/765312

posted on 2021-07-29 14:32  Rick.lz  阅读(149)  评论(0编辑  收藏  举报
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