环境说明：
192.168.202.177 consul-server01
192.168.202.177 consul-server02
192.168.202.174 mysql server node1、consul client
192.168.202.175 mysql server node2、consul client
192.168.202.176 mysql server node3、consul client
系统版本：centos 7.5
Mysql version：5.7.25
consul version:1.4.4
安装
在官网:https://www.consul.io/downloads.html下载对应的版本，解压后copy consul 到/usr/local/bin/下即可
分别在5台机器上安装然后运行
mkdir -pv /etc/consul.d/ && mkdir -pv /data/consul/ && mkdir -pv /data/consul/shell
配置部署
在consul server 192.168.202.177上 编写配置文件
[root@consul-server consul]# cat /etc/consul.d/server.json
{
"datacenter": "dc1",
"data_dir": "/data/consul",
"log_level": "INFO",
"node_name": "consul-server01",
"server": true,
"bootstrap_expect": 1,
"bind_addr": "192.168.202.177",
"client_addr": "192.168.202.177",
"ui":true,
"retry_join": ["192.168.202.177","192.168.202.178"],
"retry_interval": "10s",
"enable_debug": false,
"rejoin_after_leave": true,
"start_join": ["192.168.202.177","192.168.202.178"],
"enable_syslog": true,
"syslog_facility": "local0"
}
在consul server 192.168.202.178上 编写配置文件
[root@consul-server02 consul]# cat /etc/consul.d/server.json
{
"datacenter": "dc1",
"data_dir": "/data/consul",
"log_level": "INFO",
"node_name": "consul-server02",
"server": true,
"bootstrap_expect": 1,
"bind_addr": "192.168.202.178",
"client_addr": "192.168.202.178",
"ui":true,
"retry_join": ["192.168.202.177","192.168.202.178"],
"retry_interval": "10s",
"enable_debug": false,
"rejoin_after_leave": true,
"start_join": ["192.168.202.177","192.168.202.178"],
"enable_syslog": true,
"syslog_facility": "local0"
}
在consul client 192.168.202.174、192.168.202.175、192.168.202.176上编写配置文件,三台服务器的上bind_addr 修改为响应IP即可
[root@node1 consul]# cat /etc/consul.d/client.json
{
"data_dir": "/data/consul",
"enable_script_checks": true,
"bind_addr": "192.168.202.174",
"retry_join": ["192.168.202.177"],
"retry_interval": "30s",
"rejoin_after_leave": true,
"start_join": ["192.168.202.177"] ,
"node_name": "node1"
}
在consul client 192.168.202.174、192.168.202.175、192.168.202.176上编写检测primay 脚本 和检测slave 脚本
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[root@node1 consul]# cat /data/consul/shell/check_mysql_mgr_master.sh
#!/bin/bash
port=3306
user=
"root"
passwod=
"iforgot"
comm=
"/usr/local/mysql/bin/mysql -u$user -hlocalhost -P $port -p$passwod"
value=`$comm -Nse
"select 1"
`
primary_member=`$comm -Nse
"select variable_value from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member'"
`
server_uuid=`$comm -Nse
"select variable_value from performance_schema.global_variables where VARIABLE_NAME='server_uuid';"
`
# 判断MySQL是否存活
if
[ -z $value ]
then
echo
"mysql $port is down....."
exit 2
fi
# 判断节点状态,是否存活
node_state=`$comm -Nse
"select MEMBER_STATE from performance_schema.replication_group_members where MEMBER_ID='$server_uuid'"
`
if
[ $node_state !=
"ONLINE"
]
then
echo
"MySQL $port state is not online...."
exit 2
fi
# 判断是不是主节点
if
[[ $server_uuid == $primary_member ]]
then
echo
"MySQL $port Instance is master ........"
exit 0
else
echo
"MySQL $port Instance is slave ........"
exit 2
fi
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[root@node1 consul]# cat /data/consul/shell/check_mysql_mgr_slave.sh
#!/bin/bash
port=3306
user=
"root"
passwod=
"iforgot"
comm=
"/usr/local/mysql/bin/mysql -u$user -hlocalhost -P $port -p$passwod"
value=`$comm -Nse
"select 1"
`
primary_member=`$comm -Nse
"select variable_value from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member'"
`
server_uuid=`$comm -Nse
"select variable_value from performance_schema.global_variables where VARIABLE_NAME='server_uuid';"
`
# 判断mysql是否存活
if
[ -z $value ]
then
echo
"mysql $port is down....."
exit 2
fi
# 判断节点状态
node_state=`$comm -Nse
"select MEMBER_STATE from performance_schema.replication_group_members where MEMBER_ID='$server_uuid'"
`
if
[ $node_state !=
"ONLINE"
]
then
echo
"MySQL $port state is not online...."
exit 2
fi
# 判断是不是主节点
if
[[ $server_uuid != $primary_member ]]
then
echo
"MySQL $port Instance is slave ........"
exit 0
else
node_num=`$comm -Nse
"select count(*) from performance_schema.replication_group_members"
`
# 判断如果没有任何从节点，主节点也注册从角色服务。
if
[ $node_num -eq 1 ]
then
echo
"MySQL $port Instance is slave ........"
exit 0
else
echo
"MySQL $port Instance is master ........"
exit 2
fi
fi
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启动consul server 在192.168.202.177、192.168.202.178上
nohup consul agent -config-dir=/etc/consul.d > /data/consul/consul.log &
启动consul client 在192.168.202.174、192.168.202.175、192.168.202.176
nohup consul agent -config-dir=/etc/consul.d > /data/consul/consul.log &
观察consul server的log日志3个client自动注册到了consul上了
查看consul成员
[root@consul-server consul]# consul members -http-addr='192.168.202.177:8500' Node Address Status Type Build Protocol DC Segment consul-server01 192.168.202.177:8301 alive server 1.4.4 2 dc1 <all> consul-server02 192.168.202.178:8301 alive server 1.4.4 2 dc1 <all> node1 192.168.202.174:8301 alive client 1.4.4 2 dc1 <default> node2 192.168.202.175:8301 alive client 1.4.4 2 dc1 <default> node3 192.168.202.176:8301 alive client 1.4.4 2 dc1 <default>
到此为止consul 集群已经搭建成功了
构建bind域名解析
请参考 https://www.cnblogs.com/EikiXu/p/10683490.html
参考来源：