环境准备
1、修改主机名
hostnamectl set-hostname manager
更新host文件
vim /etc/hosts
替换127.0.0.1后面的主机名为对应的主机名称
127.0.0.1 master
2、关闭防火墙，关闭Selinux
systemctl stop firewalld #临时关闭
systemctl disable firewalld #永久关闭
setenforce 0 #临时关闭 sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config #永久关闭
3、配置hosts文件
cat >> /etc/hosts <<EOF
192.168.5.54 manager
192.168.5.116 master
192.168.5.103 slave1
192.168.5.194 slave2
EOF
4、配置免密登录
ssh-keygen -t rsa ssh-copy-id -i /root/.ssh/id_rsa.pub root@manager ssh-copy-id -i /root/.ssh/id_rsa.pub root@master ssh-copy-id -i /root/.ssh/id_rsa.pub root@slave1 ssh-copy-id -i /root/.ssh/id_rsa.pub root@slave2
验证
ssh manager 'hostname' ssh master 'hostname' ssh slave1 'hostname' ssh slave2 'hostname'
5、配置各MySQL节点
vim /etc/my.cnf
修改以下相关参数，server-id值各库保持不一致即可
[mysqld] #复制集群中的各节点的id均必须唯一 server-id = 100 #开启中继日志 log-bin = mysql-bin #开启二进制日志 relay-log=relay-bin #关闭名称解析（非必须） skip_name_resolve #使得更新的数据写进二进制日志中 log-slave-updates = 1
重启mysql服务
systemctl restart mysqld
6、新建共同账号
在3台mysql节点，新建用于复制的账号
use mysql; create user 'repl'@'%' identified by 'Test@1234'; grant replication slave on *.* to 'repl'@'%'; flush privileges;
6、配置一主多从复制架构
master节点
show master status;
slave1和slave2节点
change master to master_host='192.168.5.116', master_port=3306, master_user='repl', master_password='Test@1234', master_log_file='mysql-bin.000001', master_log_pos=862; start slave;
启动slave问题处理：Slave failed to initialize relay log info structure from the repository
错误原因：从库之前已有relay log
解决方法：
使用RESET SLAVE语句，清除master信息和relay日志的信息，删除所有的relay日志文件，并开始创建一个全新的中继日志
stop slave;
reset slave;
在读库节点上，查询运行状态
show slave status \G
7、新建用户mha管理的账号
只用在master节点执行
use mysql; create user 'mhaadmin'@'192.168.%.%' identified by 'Test@1234'; grant all on *.* to 'mhaadmin'@'192.168.%.%' ; flush privileges;
8、安装MHA包
四台机器上都要安装node包
wget https://github.com/yoshinorim/mha4mysql-node/releases/download/v0.58/mha4mysql-node-0.58-0.el7.centos.noarch.rpm yum install -y epel-release yum install -y perl-DBD-MySQL rpm -ivh mha4mysql-node-0.58-0.el7.centos.noarch.rpm
manager节点
wget https://github.com/yoshinorim/mha4mysql-manager/releases/download/v0.58/mha4mysql-manager-0.58-0.el7.centos.noarch.rpm yum install -y epel-release yum install -y perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes rpm -ivh mha4mysql-manager-0.58-0.el7.centos.noarch.rpm
9、创建Manager相关目录与配置文件
mkdir -p /etc/mha mkdir -p /var/log/mha/app1 vim /etc/mha/app1.cnf
[server default] manager_log=/var/log/mha/app1/manager manager_workdir=/var/log/mha/app1 master_binlog_dir=/data/binlog user=mhaadmin password=Test@1234 ping_interval=2 repl_user=repl repl_password=Test@1234 ssh_user=root [server1] hostname=192.168.5.116 port=3306 [server2] hostname=192.168.5.103 port=3306 [server3] hostname=192.168.5.194 port=3306
10、检查
检查ssh免密
masterha_check_ssh --conf=/etc/mha/app1.cnf
检查MySQL复制状态
masterha_check_repl --conf=/etc/mha/app1.cnf
11、启动MHA服务
nohup masterha_manager --conf=/etc/mha/app1.cnf &> /var/log/mha/app1/manager.log &
masterha_check_status --conf=/etc/mha/app1.cnf
