在MHA Manager端配置中，如果实现MHA的vip故障切换需要在配置文件/etc/masterha/app1/app1.cnf 中启用下面三个参数：

master_ip_failover_script= /etc/masterha/app1/master_ip_failover#master failover时执行
#shutdown_script= /etc/masterha/power_manager
report_script= /etc/masterha/app1/send_report#master failover时执行
master_ip_online_change_script=/etc/masterha/app1/master_ip_online_change#master switchover时执行MHA配置见：http://blog.csdn.net/lichangzai/article/details/50470771

脚本具体内容如下：

[root@host8 app1]# cat master_ip_failover

#!/usr/bin/env perl

use strict;

use warnings FATAL =>'all';

use Getopt::Long;

my (

$command, $ssh_user,$orig_master_host, $orig_master_ip,

$orig_master_port, $new_master_host, $new_master_ip,$new_master_port

);

my $vip = '10.1.5.21/24'; # Virtual IP

my $key = "1";

my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";

my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";

my $exit_code = 0;

GetOptions(

'command=s' => \$command,

'ssh_user=s' => \$ssh_user,

'orig_master_host=s' => \$orig_master_host,

'orig_master_ip=s'=> \$orig_master_ip,

'orig_master_port=i' => \$orig_master_port,

'new_master_host=s' => \$new_master_host,

'new_master_ip=s'=> \$new_master_ip,

'new_master_port=i' => \$new_master_port,

);

exit &main();

sub main {

#print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";

if ( $command eq "stop" || $command eq "stopssh" ) {

# $orig_master_host, $orig_master_ip, $orig_master_port are passed.

# If you manage master ip address at global catalog database,

# invalidate orig_master_ip here.

my $exit_code = 1;

eval {

print "\n\n\n***************************************************************\n";

print "Disabling the VIP - $vip on old master: $orig_master_host\n";

print "***************************************************************\n\n\n\n";

&stop_vip();

$exit_code = 0;

};

if ($@) {

warn "Got Error: $@\n";

exit $exit_code;

}

exit $exit_code;

}

elsif ( $command eq "start" ) {

# all arguments are passed.

# If you manage master ip address at global catalog database,

# activate new_master_ip here.

# You can also grant write access (create user, set read_only=0, etc) here.

my $exit_code = 10;

eval {

print "\n\n\n***************************************************************\n";

print "Enabling the VIP - $vip on new master: $new_master_host \n";

print "***************************************************************\n\n\n\n";

&start_vip();

$exit_code = 0;

};

if ($@) {

warn $@;

exit $exit_code;

}

exit $exit_code;

}

elsif ( $command eq "status" ) {

print "Checking the Status of the script.. OK \n";

`ssh $ssh_user\@$orig_master_host \" $ssh_start_vip \"`;

exit 0;

}

else {

&usage();

exit 1;

}

}

# A simple system call that enable the VIP on the new master

sub start_vip() {

`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;

}

# A simple system call that disable the VIP on the old_master

sub stop_vip() {

`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;

}

sub usage {

print

"Usage: master_ip_failover –command=start|stop|stopssh|status –orig_master_host=host –orig_master_ip=ip –orig_master_port=po

rt –new_master_host=host –new_master_ip=ip –new_master_port=port\n";

}

[root@host8 app1]# cat master_ip_online_change

#!/usr/bin/env perl

use strict;

use warnings FATAL =>'all';

use Getopt::Long;

my $vip = '10.1.5.21/24'; # Virtual IP

my $key = "1";

my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";

my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";

my $exit_code = 0;

my (

$command, $orig_master_is_new_slave, $orig_master_host,

$orig_master_ip,$orig_master_port, $orig_master_user,

$orig_master_password, $orig_master_ssh_user, $new_master_host,

$new_master_ip,$new_master_port, $new_master_user,

$new_master_password, $new_master_ssh_user,

);

GetOptions(

'command=s'=> \$command,

'orig_master_is_new_slave' => \$orig_master_is_new_slave,

'orig_master_host=s'=> \$orig_master_host,

'orig_master_ip=s' => \$orig_master_ip,

'orig_master_port=i'=> \$orig_master_port,

'orig_master_user=s'=> \$orig_master_user,

'orig_master_password=s'=> \$orig_master_password,

'orig_master_ssh_user=s'=> \$orig_master_ssh_user,

'new_master_host=s'=> \$new_master_host,

'new_master_ip=s' => \$new_master_ip,

'new_master_port=i'=> \$new_master_port,

'new_master_user=s'=> \$new_master_user,

'new_master_password=s'=> \$new_master_password,

'new_master_ssh_user=s'=> \$new_master_ssh_user,

);

exit &main();

sub main {

#print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";

if ( $command eq "stop" || $command eq "stopssh" ) {

# $orig_master_host, $orig_master_ip, $orig_master_port are passed.

# If you manage master ip address at global catalog database,

# invalidate orig_master_ip here.

my $exit_code = 1;

eval {

print "\n\n\n***************************************************************\n";

print "Disabling the VIP - $vip on old master: $orig_master_host\n";

print "***************************************************************\n\n\n\n";

&stop_vip();

$exit_code = 0;

};

if ($@) {

warn "Got Error: $@\n";

exit $exit_code;

}

exit $exit_code;

}

elsif ( $command eq "start" ) {

# all arguments are passed.

# If you manage master ip address at global catalog database,

# activate new_master_ip here.

# You can also grant write access (create user, set read_only=0, etc) here.

my $exit_code = 10;

eval {

print "\n\n\n***************************************************************\n";

print "Enabling the VIP - $vip on new master: $new_master_host \n";

print "***************************************************************\n\n\n\n";

&start_vip();

$exit_code = 0;

};

if ($@) {

warn $@;

exit $exit_code;

}

exit $exit_code;

}

elsif ( $command eq "status" ) {

print "Checking the Status of the script.. OK \n";

`ssh $orig_master_ssh_user\@$orig_master_host \" $ssh_start_vip \"`;

exit 0;

}

else {

&usage();

exit 1;

}

}

# A simple system call that enable the VIP on the new master

sub start_vip() {

`ssh $new_master_ssh_user\@$new_master_host \" $ssh_start_vip \"`;

}

# A simple system call that disable the VIP on the old_master

sub stop_vip() {

`ssh $orig_master_ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;

}

sub usage {

print

"Usage: master_ip_failover –command=start|stop|stopssh|status –orig_master_host=host –orig_master_ip=ip –orig_master_port=po

rt –new_master_host=host –new_master_ip=ip –new_master_port=port\n";

}

#以下是重用写的master_ip_online_change(shell)脚本

[root@host8 app1]# cat master_ip_online_change.sh

#/bin/bash

source /root/.bash_profile

vip=`echo '10.1.5.21/24'` # Virtual IP

key=`echo '1'`

command=`echo "$1" | awk -F = '{print $2}'`

orig_master_host=`echo "$2" | awk -F = '{print $2}'`

new_master_host=`echo "$7" | awk -F = '{print $2}'`

orig_master_ssh_user=`echo "${12}" | awk -F = '{print $2}'`

new_master_ssh_user=`echo "${13}" | awk -F = '{print $2}'`

stop_vip=`echo "ssh root@$orig_master_host /sbin/ifconfig eth0:$key down"`

start_vip=`echo "ssh root@$new_master_host /sbin/ifconfig eth0:$key $vip"`

if [ $command = 'stop' ]

then

echo -e "\n\n\n***************************************************************\n"

echo -e "Disabling the VIP - $vip on old master: $orig_master_host\n"

$stop_vip

if [ $? -eq 0 ]

then

echo "Disabled the VIP successfully"

else

echo "Disabled the VIP failed"

fi

echo -e "***************************************************************\n\n\n\n"

fi

if [ $command = 'start' -o $command = 'status' ]

then

echo -e "\n\n\n***************************************************************\n"

echo -e "Enabling the VIP - $vip on new master: $new_master_host \n"

$start_vip

if [ $? -eq 0 ]

then

echo "Enabled the VIP successfully"

else

echo "Enabled the VIP failed"

fi

echo -e "***************************************************************\n\n\n\n"

fi

[root@host8 app1]# cat send_report

#/bin/bash

source /root/.bash_profile

orig_master_host=`echo "$1" | awk -F = '{print $2}'`

new_master_host=`echo "$2" | awk -F = '{print $2}'`

new_slave_hosts=`echo "$3" | awk -F = '{print $2}'`

subject=`echo "$4" | awk -F = '{print $2}'`

body=`echo "$5" | awk -F = '{print $2}'`

#判断日志结尾是否有successfully，有则表示切换成功，成功与否都发邮件。

tac /etc/masterha/app1/manager.log | sed -n 2p | grep 'successfully' > /dev/null

if [ $? -eq 0 ]

then

echo -e "MHA $subject 主从切换成功\n master:$orig_master_host --> $new_master_host \n $body \n 当前从库:$new_slave_hosts" | mutt

-s "MySQL实例宕掉,MHA $subject 切换成功" -- 94097532@qq.com

else

echo -e "MHA $subject 主从切换失败\n master:$orig_master_host --> $new_master_host \n $body" | mutt -s "MySQL实例宕掉,MHA $subje

ct 切换失败" -- 94097532@qq.com

fi