一。环境
操作系统：Redhat 6.3
MySQL:MySQL 5.5
MHA:mha4mysql-manager-0.55,mha4mysql-node-0.54
二。安装
MHA Node:
$ yum install perl-DBD-MySQL
$ rpm -ivh mha4mysql-node-X.Y-0.noarch.rpm
MHA Manager:
$ perl -MCPAN -e "install Config::Tiny"
$ perl -MCPAN -e "install Log::Dispatch"
$ perl -MCPAN -e "install Parallel::ForkManager"
$ tar -zxf mha4mysql-manager-X.Y.tar.gz
$ perl Makefile.PL
$ make
$ sudo make install
三。Running MHA Manager from daemontools
Currently MHA Manager process does not run as a daemon. If failover completed successfully or the master process was killed by accident, the manager stops working. To run as a daemon, daemontool. or any external daemon program can be used. Here is an example to run from daemontools.
1. Install daemontools
ForRedHat
1.下载daemontools
2. Create run file under /service/masterha(app_name)/run
manager_host# mkdir /service/masterha_app1
注：第一级目录必须是/service，不能使用其它名字，试着把/service改成/mha等，尝试多很多次都未果，现在还没有找到原因，有可能是daemontools默认约定;
第二级目录根据实际情况重命名
第三级文件的名字必须是run
manager_host# cat /service/masterha_test1/run
#!/bin/sh
exec masterha_manager --global_conf=/etc/mha/masterha_default.cnf --conf=/etc/mha/masterha_test1/conf/app.conf --wait_on_monitor_error=60 --wait_on_failover_error=60 >> /var/log/masterha/test1/app.log 2>&1
开启snc服务
manager_host# /usr/bin/svscanboot
注：如果不开启此服务，启动如下命令会报错“找不到文件”之类的。
manager_host# chmod 755 /service/masterha_test1/run
You can stop/restart monitoring by daemontool commands.
## stopping monitoring
manager_host# svc -d /service/masterha_test1
## starting monitoring
manager_host# svc -u /service/masterha_test1
## 启动后将会看到supervise进程
manager_host# ps -efwww|grep supervise
root 21528 1206 0 15:25 ? 00:00:00 supervise masterha_test1
manager_host# ps -efwww|grep manager
root 21529 21528 0 15:25 ? 00:00:05 perl /usr/local/bin/masterha_manager --global_conf=/etc/mha/masterha_default.cnf --conf=/etc/mha/masterha_test1/conf/app.conf --wait_on_monitor_error=60 --wait_on_failover_error=60
参考：
https://code.google.com/p/mysql-master-ha/wiki/Installation
http://cr.yp.to/daemontools.html
本文出自 “MySQL一点一滴” 博客，请务必保留此出处http://iamadba.blog.51cto.com/1034125/1375826