#各节点的etc/hosts文件配置内容如下：
172.18.67.11 node1 node1
172.18.67.12 node2 node2
172.18.67.13 node3 node3
172.18.67.14 node4 node4

#初始节点master的配置：
server_id=1
relay_log=relay-log
log_bin=master-log#所有slave节点的配置如下：
server_id=2,3      #两个slave节点id号不同
relay_log=relay-log
log_bin=master-log
relay_log_purge=0
read_only=1

#启动MariaDB服务
[root@node1 ~]# systemctl start mariadb
[root@node2 ~]# systemctl start mariadb
[root@node3 ~]# systemctl start mariadb#登入主节点
[root@node1 ~]# mysql
MariaDB [(none)]> SHOW MASTER STATUS;
+-------------------+----------+--------------+------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-log.000003 |      245 |              |                  |
+-------------------+----------+--------------+------------------+#为一个用户授权
MariaDB [(none)]> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO 'repluser'@'172.18.67.%' IDENTIFIED BY 'replpass';
MariaDB [(none)]> FLUSH PRIVILEGES;#从节点node2配置
MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST='172.18.67.11',MASTER_USER='repluser',MASTER_PASSWORD='replpass',MASTER_LOG_FILE='master-log.000003',MASTER_LOG_POS=245;
MariaDB [(none)]> START SLAVE;
MariaDB [(none)]> SHOW SLAVE STATUS\G;
*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 172.18.67.11Master_User: repluserMaster_Port: 3306Connect_Retry: 60Master_Log_File: master-log.000003Read_Master_Log_Pos: 497Relay_Log_File: relay-log.000002Relay_Log_Pos: 782Relay_Master_Log_File: master-log.000003Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0Last_Error: Skip_Counter: 0Exec_Master_Log_Pos: 497Relay_Log_Space: 1070Until_Condition: NoneUntil_Log_File: Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: NoLast_IO_Errno: 0Last_IO_Error: Last_SQL_Errno: 0Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 1#从节点node3配置
MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST='172.18.67.11',MASTER_USER='repluser',MASTER_PASSWORD='replpass',MASTER_LOG_FILE='master-log.000003',MASTER_LOG_POS=245;
MariaDB [(none)]> START SLAVE;
MariaDB [(none)]> SHOW SLAVE STATUS\G;
*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 172.18.67.11Master_User: repluserMaster_Port: 3306Connect_Retry: 60Master_Log_File: master-log.000003Read_Master_Log_Pos: 497Relay_Log_File: relay-log.000002Relay_Log_Pos: 782Relay_Master_Log_File: master-log.000003Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0Last_Error: Skip_Counter: 0Exec_Master_Log_Pos: 497Relay_Log_Space: 1070Until_Condition: NoneUntil_Log_File: Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: NoLast_IO_Errno: 0Last_IO_Error: Last_SQL_Errno: 0Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 1
MariaDB [(none)]> SELECT User,Host FROM mysql.user;
+----------+-------------+
| User     | Host        |
+----------+-------------+
| root     | 127.0.0.1   |
| repluser | 172.18.67.% |
| root     | ::1         |
|          | localhost   |
| root     | localhost   |
|          | node3       |
| root     | node3       |
+----------+-------------+#在主节点授权一个HA管理的账号
MariaDB [(none)]> GRANT ALL ON *.* TO 'haadmin'@'172.18.67.%' IDENTIFIED BY 'hapass';
MariaDB [(none)]> FLUSH PRIVILEGES;

#下面的操作在manager节点操作即可
[root@node4 ~]# ssh-keygen -t rsa
[root@node4 ~]# cat .ssh/id_rsa.pub > .ssh/authorized_keys
[root@node4 ~]# chmod 600 .ssh/authorized_keys[root@node4 ~]# scp -p .{id_rsa,authorized_keys} root@node1:/root/.ssh/
[root@node4 ~]# scp -p .{id_rsa,authorized_keys} root@node2:/root/.ssh/
[root@node4 ~]# scp -p .{id_rsa,authorized_keys} root@node3:/root/.ssh

#在MHA节点安装两个包
[root@node4 ~]# yum install ./mha4mysql-*#将mha4mysql-node-0.56-0.el6.noarch.rpm复制到其它三个节点
[root@node4 ~]# for i in {1..3};do scp mha4mysql-node-0.56-0.el6.noarch.rpm node${i}:/root/; done#安装mha4mysql-node-0.56-0.el6.noarch.rpm
[root@node4 ~]# for i in {1..3};do ssh node$i 'yum install -y /root/mha4mysql-node-0.56-0.el6.noarch.rpm'; done

[root@node4 ~]# vim /etc/mha4mysql/mha4.cnf
[server default]
user=mhaadmin
password=mhapass
manager_workdir=/data/masterha/app1
manager_log=/data/masterha/app1/manager.log
remote_workdir=/data/masterha/app1
ssh_user=root
repl_user=repluser
repl_password=replpass
ping_interval=1
master_ip_failover_script=/tmp/master_ip_failover[server1]
hostname=172.18.67.11
ssh_port=22
candidate_master=1[server2]
hostname=172.18.67.12
ssh_port=22
candidate_master=1[server3]
hostname=172.18.67.13
ssh_port=22
candidate_master=1#检测各节点间ssh互信互通配置对否成功
[root@node4 ~]# masterha_check_ssh --conf=/etc/masterha/app1.cnf
[root@node4 ~]# masterha_check_repl --conf=/etc/masterha/app1.cnf#最后一行输出如下类似信心表示成功
MySQL Replication Health is OK.#启动MHA
[root@node4 ~]# nohup masterha_manager --conf=/etc/masterha/app1.cnf  > /data/masterha/
app1/manager.log 2>&1 &#查看MHA状态
[root@node4 ~]# masterha_check_status  --conf=/etc/mha/app1.cnf

#停止master节点的mariadb服务。此操作在master节点执行
[root@node1 ~]# systemctl stop mariadb#查看MHA状态。此操作在manager节点执行
[root@node4 ~]# masterha_check_status  --conf=/etc/mha/app1.cnf
app1 is stopped(2:NOT_RUNNING)#验证master节点是否切换。此操作在slave节点上执行。
#可以看到slave2节点的Master_Host已经从172.18.67.11切换到172.18.67.12
[root@node2 ~]# mysql -e 'SHOW SLAVE STATUS\G' | grep "Master_Host"Master_Host: 172.18.67.12