ETCD集群部署

静态配置部署etcd集群

部署一个三节点的etcd集群,节点信息为:

etcd1-101	10.0.0.101	2380
etcd2-102	10.0.0.102	2380
etcd3-103	10.0.0.103	2380

 

 

 

 

 

• 接下来对每个节点进行如下部署:

1.下载安装包

地址: https://github.com/etcd-io/etcd/releases

自行选择版本,这里使用当前最新版: v3.5.1

 

curl -L https://github.com/coreos/etcd/releases/download/v3.5.1/etcd-v3.5.1-linux-amd64.tar.gz -o etcd-v3.5.1-linux-amd64.tar.gz

 

2.解压 / 创建数据目录

tar -zxvf etcd-v3.5.1-linux-amd64.tar.gz

• 解压后将目录改名为etcd, 放在/usr/local/ 目录下

3.创建数据目录

 

mkdir /usr/local/etcd/data

 

4.编辑配置文件

etcd1-101: 10.0.0.101

name: etcd1
data-dir: /usr/local/etcd/data
initial-advertise-peer-urls: http://10.0.0.101:2380
listen-peer-urls: http://10.0.0.101:2380
listen-client-urls: http://10.0.0.101:2379,http://127.0.0.1:2379
advertise-client-urls: http://10.0.0.101:2379
initial-cluster-token: Alayman-etcd-cluster
initial-cluster: etcd1=http://10.0.0.101:2380,etcd2=http://10.0.0.102:2380,etcd3=http://10.0.0.103:2380
initial-cluster-state: new

etcd2-102: 10.0.0.102

name: etcd2
data-dir: /usr/local/etcd/data
initial-advertise-peer-urls: http://10.0.0.102:2380
listen-peer-urls: http://10.0.0.102:2380
listen-client-urls: http://10.0.0.102:2379,http://127.0.0.1:2379
advertise-client-urls: http://10.0.0.102:2379
initial-cluster-token: Alayman-etcd-cluster
initial-cluster: etcd1=http://10.0.0.101:2380,etcd2=http://10.0.0.102:2380,etcd3=http://10.0.0.103:2380
initial-cluster-state: new

etcd3-103: 10.0.0.103

name: etcd3
data-dir: /usr/local/etcd/data
initial-advertise-peer-urls: http://10.0.0.103:2380
listen-peer-urls: http://10.0.0.103:2380
listen-client-urls: http://10.0.0.103:2379,http://127.0.0.1:2379
advertise-client-urls: http://10.0.0.103:2379
initial-cluster-token: Alayman-etcd-cluster
initial-cluster: etcd1=http://10.0.0.101:2380,etcd2=http://10.0.0.102:2380,etcd3=http://10.0.0.103:2380
initial-cluster-state: new

配置文件解释:

• name：当前etcd节点名称。
• data-dir：数据存储目录。
• initial-advertise-peer-urls：集群的其他节点通过该地址与当前节点通信。
• listen-peer-urls：当前节点通过该地址监听集群其他节点发送的信息。
• listen-client-urls：当前节点通过该地址监听客户端发送的信息。
• advertise-client-urls：客户端通过该地址与当前节点通信
• initial-cluster-token：用于区分不同的集群，同一集群的所有节点配置相同的值。
• initial-cluster：当前集群的所有节点信息，当前节点根据此信息与其他节点取得联系。
• initial-cluster-state： 本次是否为新建集群，有两个取值：new和existing。

5.开放端口

etcd server默认使用2379端口监听客户端的请求，使用2380端口监听其他server的请求。本文配置使用的也是2379和2380两个端口。

1. 开放2379和2380两个端口

firewall-cmd --zone=public --add-port=2379/tcp --permanent
firewall-cmd --zone=public --add-port=2380/tcp --permanent

2.重启防火墙：

firewall-cmd --reload

3.验证端口是否开放成功:

firewall-cmd --zone=public --query-port=2379/tcp
firewall-cmd --zone=public --query-port=2380/tcp

6.配置启动文件

1.创建服务启动文件在/usr/lib/systemd/system/etcd.service 目录下

[Unit]
Description=etcd
After=network.target
 
[Service]
Type=notify
ExecStart=/usr/local/etcd/etcd --config-file=/usr/local/etcd/conf.yml
 
[Install]
WantedBy=multi-user.target

2.启动服务

?

1 2	systemctl daemon-reload systemctl start etcd.service

　　3.检查并设置开机自启动

systemctl status etcd.service
systemctl enable etcd.service

7.验证集群

1.将etcdctl 二进制文件复制到 /usr/local/bin/  目录下,便于执行命令:

    
cp /usr/local/etcd/etcdctl /usr/local/bin/

2.查看集群成员列表：

[root@etcd3-103~]# etcdctl member list
3fd7902e14c12d66, started, etcd1, http://10.0.0.101:2380, http://10.0.0.101:2379, false
79b84a65e74e6767, started, etcd2, http://10.0.0.102:2380, http://10.0.0.102:2379, false
995b12b403030935, started, etcd3, http://10.0.0.103:2380, http://10.0.0.103:2379, false

3.查看集群成员健康情况：

[root@etcd3-103~]# etcdctl endpoint health --endpoints="http://10.0.0.101:2380,http://10.0.0.102:2380,http://10.0.0.103:2380"http://10.0.0.102:2380 is healthy: successfully committed proposal: took = 5.345893ms
http://10.0.0.101:2380 is healthy: successfully committed proposal: took = 5.808915ms
http://10.0.0.103:2380 is healthy: successfully committed proposal: took = 5.950364ms

4.查看etcd版本

[root@etcd3-103~]# /usr/local/etcd/etcd --version
etcd Version: 3.5.1
Git SHA: e8732fb5f
Go Version: go1.16.3
Go OS/Arch: linux/amd64

5.在其中一个节点设置一个key-value，到其他节点查看。

##103写入
[root@etcd3-103~]# etcdctl put Alayman pretty
OK
[root@etcd3-103~]# etcdctl put golang is-nice
OK

[root@etcd3-103~]# etcdctl get Alayman
Alayman
pretty
[root@etcd3-103~]# etcdctl get golang
golang
is-nice

##101/102查看
[root@etcd1-101~]# etcdctl get Alayman
Alayman
pretty

[root@etcd2-102~]# etcdctl get golang
golang
is-nice

 

etcd常用命令

插入数据测试

# etcdctl put name1 james
# etcdctl put name11 alice
# etcdctl put name12 seli
# etcdctl put name2 jetty
# etcdctl put name3 tom
# etcdctl put name4 cris
# etcdctl put avg_age 25

查询数据

按key查询

key/value都显示

# etcdctl get name1
name1
james

不显示key只显示value

# etcdctl get --print-value-only name1
james

按key前缀查找

# etcdctl get --prefix name
name1
james
name11
alice
name12
seli
name2
jetty
name3
tom
name4
cris

按key的字节排序的前缀查找 >=

# etcdctl get --from-key name2
name2
jetty
name3
tom
name4
cris

按key的字节排序区间查找<= value <

# etcdctl get name1 name3
name1
james
name11
alice
name12
seli
name2
jetty

查找所有key

# etcdctl get --from-key ""
avg_age
25
name1
james
name11
alice
name12
seli
name2
jetty
name3
tom
name4
cris

删除数据

删除key name11

etcdctl del name11

删除key时并返回被删除的键值对

# etcdctl del --prev-kv name12
1
name12
seli

删除指定字节排序起始值后的key

# etcdctl del --prev-kv --from-key name3
2
name3
tom
name4
cris

删除指定前缀的key

# etcdctl del --prev-kv --prefix name
2
name1
james
name2
jetty

删除所有数据

# etcdctl del --prefix ""
9

更新数据--直接用put即可

# etcdctl get --prefix ""
avg_age
25
# etcdctl put avg_age 30
OK
# etcdctl get --prefix ""
avg_age
30

博客参考地址: https://www.cnblogs.com/wujuntian/p/15121004.html