etcd 1.1.3 etcd install static cluster(centos6)

0. 安装etcd集群之前

hostname	ip	OS
etcd01	192.168.86.19	centos6.8
etcd02	192.168.86.20	centos6.8
etcd03	192.168.86.21	centos6.8

主要参考文档:etcd static方法启动集群和etcd选项官方说明

etcd使用的是最新稳定版本3.2.5

---

1. 使用static方法启动etcd集群

1) 安装etcd

wget https://github.com/coreos/etcd/releases/download/v3.2.5/etcd-v3.2.5-linux-amd64.tar.gz
tar zxvf etcd-v3.2.5-linux-amd64.tar.gz
cp etcd-v3.2.5-linux-amd64/{etcd,etcdctl} /usr/local/bin
echo 'export PATH=$PATH:/usr/local/bin' >> /etc/profile
source /etc/profile

因为etcd是go语言开发的，只要下载了二进制文件，可以执行就相当于安装完毕了

2) 启动etcd

在各个节点创建新文件/usr/local/bin/etcdStart

#!/bin/bash

etcd --name infra0 --initial-advertise-peer-urls http://192.168.86.19:2380 \
  --listen-peer-urls http://192.168.86.19:2380 \
  --listen-client-urls http://192.168.86.19:2379,http://127.0.0.1:2379 \
  --advertise-client-urls http://192.168.86.19:2379 \
  --initial-cluster-token etcd-cluster-1 \
  --initial-cluster infra0=http://192.168.86.19:2380,infra1=http://192.168.86.20:2380,infra2=http://192.168.86.21:2380 \
  --initial-cluster-state new &
```  

``` bash
#!/bin/bash

etcd --name infra1 --initial-advertise-peer-urls http://192.168.86.20:2380 \
  --listen-peer-urls http://192.168.86.20:2380 \
  --listen-client-urls http://192.168.86.20:2379,http://127.0.0.1:2379 \
  --advertise-client-urls http://192.168.86.20:2379 \
  --initial-cluster-token etcd-cluster-1 \
  --initial-cluster infra0=http://192.168.86.19:2380,infra1=http://192.168.86.20:2380,infra2=http://192.168.86.21:2380 \
  --initial-cluster-state new &

#!/bin/bash

etcd --name infra2 --initial-advertise-peer-urls http://192.168.86.21:2380 \
  --listen-peer-urls http://192.168.86.21:2380 \
  --listen-client-urls http://192.168.86.21:2379,http://127.0.0.1:2379 \
  --advertise-client-urls http://192.168.86.21:2379 \
  --initial-cluster-token etcd-cluster-1 \
  --initial-cluster infra0=http://192.168.86.19:2380,infra1=http://192.168.86.20:2380,infra2=http://192.168.86.21:2380 \
  --initial-cluster-state new &

--listen-client-urls必须要配置127.0.0.1:2379

在各节点上启动etcd

chmod u+x,g+x /usr/local/bin/etcdStart
etcdStart

3) 检查etcd状态

查看集群状态

ETCDCTL_API=3 etcdctl --endpoints http://192.168.86.20:2379 member list
719ce5a05ef423e, started, infra2, http://192.168.86.21:2380, http://192.168.86.21:2379
90cbb00497c29dbe, started, infra1, http://192.168.86.20:2380, http://192.168.86.20:2379
bead1527d2c2b2c1, started, infra0, http://192.168.86.19:2380, http://192.168.86.19:2379


curl -X GET http://192.168.86.19:2379/v2/members
{"members":[{"id":"719ce5a05ef423e","name":"my-etcd-3","peerURLs":["http://192.168.86.21:2380"],"clientURLs":["http://192.168.86.21:2379"]},{"id":"90cbb00497c29dbe","name":"my-etcd-2","peerURLs":["http://192.168.86.20:2380"],"clientURLs":["http://192.168.86.20:2379"]},{"id":"bead1527d2c2b2c1","name":"my-etcd-1","peerURLs":["http://192.168.86.19:2380"],"clientURLs":["http://192.168.86.19:2379"]}]}
curl -X GET http://192.168.86.19:2379/v2/members/leader
{"id":"bead1527d2c2b2c1","name":"infra0","peerURLs":["http://192.168.86.19:2380"],"clientURLs":["http://192.168.86.19:2379"]}

ETCDCTL_API=3变量的作用是让etctl使用etcd3的api语法，默认是etcd2的api语法。

增删改查

# 使用etcdctl
ETCDCTL_API=3 etcdctl --endpoints http://192.168.86.20:2379 put /v2/keys/test test
OK
ETCDCTL_API=3 etcdctl --endpoints http://192.168.86.20:2379 get /v2/keys/test
/test
test
ETCDCTL_API=3 etcdctl --endpoints http://192.168.86.20:2379 del /v2/keys/test
1
ETCDCTL_API=3 etcdctl --endpoints http://192.168.86.20:2379 get /v2/keys/test

# 使用http方法（curl工具）
curl -X PUT http://192.168.86.19:2379/v2/keys/test -d value="test"
curl http://192.168.86.19:2379/v2/keys/test
{"action":"get","node":{"key":"/test","value":"","modifiedIndex":11,"createdIndex":11}}
curl -X DELETE http://192.168.86.19:2379/v2/keys/test
curl http://192.168.86.19:2379/v2/keys/test
{"errorCode":100,"message":"Key not found","cause":"/test","index":12}