1.环境规划
192.168.12.131 node01
192.168.12.132 node02
192.168.12.133 node03
2.环境准备
一主两从GTID，略。
3.配置关键程序软连接（所有节点）
ln -s /usr/local/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog
ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql
4.配置各节点互信（密钥对）
node01:
rm ‐rf /root/.ssh
ssh‐keygen
cd /root/.ssh
mv id_rsa.pub authorized_keys
scp ‐r /root/.ssh 192.168.12.132:/root
scp ‐r /root/.ssh 192.168.12.133:/root 验证：
node01:
ssh 192.168.12.132 date
ssh 192.168.12.133 date node02:
ssh 192.168.12.131 date
ssh 192.168.12.133 date node03:
ssh 192.168.12.131 date
ssh 192.168.12.132 date
5.安装软件
#node软件和manager软件下载连接：
https://github.com/yoshinorim/mha4mysql-manager/releases/tag/v0.58
https://github.com/yoshinorim/mha4mysql-node/releases/tag/v0.58 #所有节点安装node软件依赖包
yum install perl‐DBD‐MySQL ‐y #安装node软件
rpm -ivh mha4mysql-node-0.58-0.el7.centos.noarch #在主库中创建mha需要的用户
grant all privileges on *.* to mha@'192.168.12.%' identified by 'mha'; #node03节点安装manager软件依赖包
yum install ‐y perl‐Config‐Tiny epel‐release perl‐Log‐Dispatch perl‐Parallel‐ForkManager perl‐Time‐HiRes #安装manager软件
rpm -ivh mha4mysql-manager-0.58-0.el7.centos.noarch
6.Manager配置文件准备
#创建配置文件目录
mkdir ‐p /etc/mha
#创建日志目录
mkdir ‐p /var/log/mha/app1
#编辑mha配置文件
[root@node03 ~]# vim /etc/mha/app1.cnf
[server default]
manager_log=/var/log/mha/app1/manager
manager_workdir=/var/log/mha/app1
master_binlog_dir=/mysql/binlog
user=mha
password=mysql
ping_interval=2
repl_password=mysql
repl_user=repl
ssh_user=mysql
[server1]
hostname=192.168.12.131
port=3306
[server2]
hostname=192.168.12.132
port=3306
[server3]
hostname=192.168.12.133
port=3306
7.状态检查
检查互信：
[root@node03 ~]$ masterha_check_ssh --conf=/etc/mha/app1.cnf
Sat Jul 11 20:02:04 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Sat Jul 11 20:02:04 2020 - [info] Reading application default configuration from /etc/mha/app1.cnf..
Sat Jul 11 20:02:04 2020 - [info] Reading server configuration from /etc/mha/app1.cnf..
Sat Jul 11 20:02:04 2020 - [info] Starting SSH connection tests..
Sat Jul 11 20:02:05 2020 - [debug]
Sat Jul 11 20:02:04 2020 - [debug] Connecting via SSH from root@192.168.12.131(192.168.12.131:22) to root@192.168.12.132(192.168.12.132:22)..
Sat Jul 11 20:02:05 2020 - [debug] ok.
Sat Jul 11 20:02:05 2020 - [debug] Connecting via SSH from root@192.168.12.131(192.168.12.131:22) to root@192.168.12.133(192.168.12.133:22)..
Sat Jul 11 20:02:05 2020 - [debug] ok.
Sat Jul 11 20:02:06 2020 - [debug]
Sat Jul 11 20:02:05 2020 - [debug] Connecting via SSH from root@192.168.12.132(192.168.12.132:22) to root@192.168.12.131(192.168.12.131:22)..
Sat Jul 11 20:02:05 2020 - [debug] ok.
Sat Jul 11 20:02:05 2020 - [debug] Connecting via SSH from root@192.168.12.132(192.168.12.132:22) to root@192.168.12.133(192.168.12.133:22)..
Sat Jul 11 20:02:06 2020 - [debug] ok.
Sat Jul 11 20:02:07 2020 - [debug]
Sat Jul 11 20:02:05 2020 - [debug] Connecting via SSH from root@192.168.12.133(192.168.12.133:22) to root@192.168.12.131(192.168.12.131:22)..
Sat Jul 11 20:02:06 2020 - [debug] ok.
Sat Jul 11 20:02:06 2020 - [debug] Connecting via SSH from root@192.168.12.133(192.168.12.133:22) to root@192.168.12.132(192.168.12.132:22)..
Sat Jul 11 20:02:06 2020 - [debug] ok.
Sat Jul 11 20:02:07 2020 - [info] All SSH connection tests passed successfully. 检查主从复制状态：
[root@node03 ~]$ masterha_check_repl --conf=/etc/mha/app1.cnf
Sat Jul 11 20:03:29 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Sat Jul 11 20:03:29 2020 - [info] Reading application default configuration from /etc/mha/app1.cnf..
Sat Jul 11 20:03:29 2020 - [info] Reading server configuration from /etc/mha/app1.cnf..
Sat Jul 11 20:03:29 2020 - [info] MHA::MasterMonitor version 0.58.
Sat Jul 11 20:03:30 2020 - [info] GTID failover mode = 1
Sat Jul 11 20:03:30 2020 - [info] Dead Servers:
Sat Jul 11 20:03:30 2020 - [info] Alive Servers:
Sat Jul 11 20:03:30 2020 - [info] 192.168.12.131(192.168.12.131:3306)
Sat Jul 11 20:03:30 2020 - [info] 192.168.12.132(192.168.12.132:3306)
Sat Jul 11 20:03:30 2020 - [info] 192.168.12.133(192.168.12.133:3306)
Sat Jul 11 20:03:30 2020 - [info] Alive Slaves:
Sat Jul 11 20:03:30 2020 - [info] 192.168.12.132(192.168.12.132:3306) Version=5.7.29-log (oldest major version between slaves) log-bin:enabled
Sat Jul 11 20:03:30 2020 - [info] GTID ON
Sat Jul 11 20:03:30 2020 - [info] Replicating from 192.168.12.131(192.168.12.131:3306)
Sat Jul 11 20:03:30 2020 - [info] 192.168.12.133(192.168.12.133:3306) Version=5.7.29-log (oldest major version between slaves) log-bin:enabled
Sat Jul 11 20:03:30 2020 - [info] GTID ON
Sat Jul 11 20:03:30 2020 - [info] Replicating from 192.168.12.131(192.168.12.131:3306)
Sat Jul 11 20:03:30 2020 - [info] Current Alive Master: 192.168.12.131(192.168.12.131:3306)
Sat Jul 11 20:03:30 2020 - [info] Checking slave configurations..
Sat Jul 11 20:03:30 2020 - [info] read_only=1 is not set on slave 192.168.12.132(192.168.12.132:3306).
Sat Jul 11 20:03:30 2020 - [info] read_only=1 is not set on slave 192.168.12.133(192.168.12.133:3306).
Sat Jul 11 20:03:30 2020 - [info] Checking replication filtering settings..
Sat Jul 11 20:03:30 2020 - [info] binlog_do_db= , binlog_ignore_db=
Sat Jul 11 20:03:30 2020 - [info] Replication filtering check ok.
Sat Jul 11 20:03:30 2020 - [info] GTID (with auto-pos) is supported. Skipping all SSH and Node package checking.
Sat Jul 11 20:03:30 2020 - [info] Checking SSH publickey authentication settings on the current master..
Sat Jul 11 20:03:31 2020 - [info] HealthCheck: SSH to 192.168.12.131 is reachable.
Sat Jul 11 20:03:31 2020 - [info]
192.168.12.131(192.168.12.131:3306) (current master)
+--192.168.12.132(192.168.12.132:3306)
+--192.168.12.133(192.168.12.133:3306) Sat Jul 11 20:03:31 2020 - [info] Checking replication health on 192.168.12.132..
Sat Jul 11 20:03:31 2020 - [info] ok.
Sat Jul 11 20:03:31 2020 - [info] Checking replication health on 192.168.12.133..
Sat Jul 11 20:03:31 2020 - [info] ok.
Sat Jul 11 20:03:31 2020 - [warning] master_ip_failover_script is not defined.
Sat Jul 11 20:03:31 2020 - [warning] shutdown_script is not defined.
Sat Jul 11 20:03:31 2020 - [info] Got exit code 0 (Not master dead). MySQL Replication Health is OK.
8.开启MHA-manager
[root@node03 ~]#nohup masterha_manager ‐‐conf=/etc/mha/app1.cnf ‐‐remove_dead_master_conf ‐‐ignore_last_failover < /dev/null> /var/log/mha/app1/manager.log 2>&1 &
10.查看MHA状态
[root@node03 ~]# masterha_check_status --conf=/etc/mha/app1.cnf
app1 (pid:1827) is running(0:PING_OK), master:192.168.12.131