1，环境准备：
DB：mysql-5.7.16
MHA：mha4mysql-manager-0.56.tar.gz、mha4mysql-node-0.56.tar.gz、daemontools-0.76.tar.gz
role ip monitor 10.99.121.206 master 10.99.121.209 slave 10.99.121.210 slave 10.99.121.213
主从：
在主上（10.99.121.206）创建复制用户与监控用户
计算
安全
数据库
网络和加速
企业服务
GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'%' IDENTIFIED BY '123qwe';
grant all privileges on *.* to 'monitor'@'%' identified by '123qwe';在从上（10.99.121.210、10.99.121.213）配置
change master to
master_host='10.99.121.209',
master_port=3306,
master_user='repluser',
master_password='123qwe',
master_log_file='binlog.000002',
master_log_pos=1009;
set global read_only=on;2,在所有的node上安装perl依赖、mha-node
master slave install epel and perl-DBD-MySQL
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
yum install perl-DBD-MySQL -y
yum install -y perl-devel
yum install -y perl-CPAN
master slave install MHA node
tar xf mha4mysql-node-0.56.tar.gz
cd mha4mysql-node-0.56
perl Makefile.PL
make && make install安装完成后会在/usr/local/bin目录下生成以下脚本文件:
apply_diff_relay_logs //识别差异的中继日志事件并将其差异的事件应用于其他的slave
filter_mysqlbinlog //去除不必要的ROLLBACK事件（MHA已不再使用这个工具）
purge_relay_logs //清除中继日志（不会阻塞SQL线程）
save_binary_logs //保存和复制master的二进制日志
3,安装MHA Manager,在MHA Manager的主机也是需要安装MHA Node,MHA Manger也依赖于perl模块
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
yum install perl-DBD-MySQL -y
yum install -y perl-devel perl-CPAN
yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes -y
tar xf mha4mysql-node-0.56.tar.gz
cd mha4mysql-node-0.56
perl Makefile.PL
make && make install
tar xf mha4mysql-manager-0.56.tar.gz
cd mha4mysql-manager-0.56
perl Makefile.PL
make && make install
cd /apps/mha4mysql-manager-0.56/samples/scripts
cp * /usr/local/bin/4,配置SSH登录无密码验证
所有服务器上生成：
ssh-keygen -t rsa
登陆10.99.121.206：
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.209
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.210
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.213登陆10.99.121.209
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.210
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.213登陆10.99.121.210
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.209
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.213登陆10.99.121.213
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.209
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.99.121.2105,配置MHA(登陆10.99.121.206)
（1）创建MHA的工作目录，并且创建相关配置文件（在软件包解压后的目录里面有样例配置文件）
mkdir -p /etc/masterha
cp mha4mysql-manager-0.56/samples/conf/app1.cnf /etc/masterha/修改app1.cnf配置文件，修改后的文件内容如下
[server default]
manager_workdir=/var/log/masterha/app1
manager_log=/var/log/masterha/app1/manager.log
master_binlog_dir=/data/mysql/mysql_data
master_ip_failover_script= /usr/local/bin/master_ip_failover
ster_ip_online_change_script= /usr/local/bin/master_ip_online_change
password=123qwe
user=monitor
ping_interval=1
remote_workdir=/tmp
repl_password=123qwe
repl_user=repluser
report_script=/usr/local/bin/send_report
secondary_check_script= /usr/local/bin/masterha_secondary_check -s lenovo2 -s lenovo1 --user=repluser --master_host=lenovo1 --master_ip=10.99.121.209 --master_port=3306
shutdown_script=""
ssh_user=root
[server1]
hostname=10.99.121.209
port=3306
[server2]
hostname=10.99.121.210
port=3306
candidate_master=1
check_repl_delay=0
[server3]
hostname=10.99.121.213
port=3306(2)设置relay log的清除方式（在每个slave节点上）
mysql -uroot -pLenovo123#@! -e "set global relay_log_purge=0"
mysql -uroot -pLenovo123#@! -e "set global relay_log_purge=0"6,检查SSH配置(10.99.121.206 Monitor 监控节点上操作)，如下
[root@lenovo16 masterha]# masterha_check_ssh --conf=/etc/masterha/app1.cnf
Thu May 25 16:55:19 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu May 25 16:55:19 2017 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Thu May 25 16:55:19 2017 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Thu May 25 16:55:19 2017 - [info] Starting SSH connection tests..
Thu May 25 16:55:20 2017 - [debug]
Thu May 25 16:55:19 2017 - [debug] Connecting via SSH from root@10.99.121.210(10.99.121.210:22) to root@10.99.121.209(10.99.121.209:22)..
Thu May 25 16:55:20 2017 - [debug] ok.
Thu May 25 16:55:20 2017 - [debug] Connecting via SSH from root@10.99.121.210(10.99.121.210:22) to root@10.99.121.213(10.99.121.213:22)..
Thu May 25 16:55:20 2017 - [debug] ok.
Thu May 25 16:55:20 2017 - [debug]
Thu May 25 16:55:19 2017 - [debug] Connecting via SSH from root@10.99.121.209(10.99.121.209:22) to root@10.99.121.210(10.99.121.210:22)..
Thu May 25 16:55:19 2017 - [debug] ok.
Thu May 25 16:55:19 2017 - [debug] Connecting via SSH from root@10.99.121.209(10.99.121.209:22) to root@10.99.121.213(10.99.121.213:22)..
Thu May 25 16:55:20 2017 - [debug] ok.
Thu May 25 16:55:21 2017 - [debug]
Thu May 25 16:55:20 2017 - [debug] Connecting via SSH from root@10.99.121.213(10.99.121.213:22) to root@10.99.121.209(10.99.121.209:22)..
Thu May 25 16:55:20 2017 - [debug] ok.
Thu May 25 16:55:20 2017 - [debug] Connecting via SSH from root@10.99.121.213(10.99.121.213:22) to root@10.99.121.210(10.99.121.210:22)..
Thu May 25 16:55:21 2017 - [debug] ok.
Thu May 25 16:55:21 2017 - [info] All SSH connection tests passed successfully.7,检查整个复制环境状况(10.99.121.206 Monitor 监控节点上操作)，如下
masterha_check_repl --conf=/etc/masterha/app1.cnf
如果遇到如下错误：
Thu May 25 16:58:30 2017 - [info] Connecting to root@10.99.121.210(10.99.121.210:22)..
Can't exec "mysqlbinlog": No such file or directory at /usr/local/share/perl5/MHA/BinlogManager.pm line 106.
mysqlbinlog version command failed with rc 1:0, please verify PATH, LD_LIBRARY_PATH, and client options
at /usr/local/bin/apply_diff_relay_logs line 493那在所有mysql数据库上执行：
ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/mysqlbinlog
ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql8,开启MHA Manager监控(10.99.121.206 Monitor 监控节点上操作)如下
[root@lenovo16 apps]# masterha_check_status --conf=/etc/masterha/app1.cnf
app1 is stopped(2:NOT_RUNNING).
[root@lenovo16 apps]# nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 &
[1] 18587
[root@lenovo16 apps]# masterha_check_status --conf=/etc/masterha/app1.cnf
app1 monitoring program is now on initialization phase(10:INITIALIZING_MONITOR). Wait for a while and try checking again.
[root@lenovo16 apps]# masterha_check_status --conf=/etc/masterha/app1.cnf
app1 (pid:18587) is running(0:PING_OK), master:10.99.121.209wget http://cr.yp.to/daemontools/daemontools-0.76.tar.gz
tar -zxvf daemontools-0.76.tar.gz
cd admin/daemontools-0.76/
package/install在src/conf-cc最后加上-include /usr/include/errno.h
[root@lenovo16 apps]# package/install最后会在admin/daemontools-0.76先建立command目录并存放相关命令，有什么命令我们可以这样查看：
[root@lenovo16 apps]# ls /apps/admin/daemontools-0.76/command
envdir fghack pgrphack setlock softlimit svc svscan svstat tai64nlocal
envuidgid multilog readproctitle setuidgid supervise svok svscanboot tai64n同时在/usr/local/bin下对上面这些命令建立了软连接方便我们执行
另外创建监控/services目录，并在/etc/inittab下也有变化：
SV:123456:respawn:/command/svscanboot它使用init的方式来守护自己
[root@lenovo16 apps]# mkdir -p /service/masterha_app1
[root@lenovo16 apps]# vim /service/masterha_app1/run
#!bin/bash
exec masterha_manager --conf=/etc/mha/app1.cnf --wait_on_monitor_error=60 --wait_on_failover_error=60 >> /var/log/masterha/app1/app1.log 2>&1
[root@lenovo16 apps]#chmod 755 /service/masterha_app1/run
##启动monitoring
svc -u /service/masterha_app1
##停止monitoring
svc -d /service/masterha_app1在此我们先不使用这种方式启动。
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