MHA VIP切换脚本

MHA能够在10~30秒内实现自动故障检测和故障转移，适用于对高可用性，数据完整性要求较高的场合。要做到无缝切换，还需要依赖于VIP漂移。VIP漂移比较常用的方式为使用keepalived或者使用脚本直接实现。脚本方式无须安装及复杂配置，相对简单。本文描述了基于脚本实现VIP切换。对于keepalived的相关配置可以参考：CentOS 5.9下安装配置Keepalived http://www.linuxidc.com/Linux/2014-12/110652.htm1、当前主机环境及MHA配置
[root@vdbsrv1 ~]# more /etc/hosts
127.0.0.1 localhost.localdomain localhost
192.168.1.6 vdbsrv1 #master
192.168.1.7 vdbsrv2 #slave1
192.168.1.8 vdbsrv3 #slave2
192.168.1.12 vdbsrv4 #manager###os环境
[root@vdbsrv4 ~]# more /etc/issue
CentOS release 5.9 （Final）
Kernel on an m ###mysql环境
[root@vdbsrv4 ~]# mysql -e "show variables like "version""
+---------------+------------+
| Variable_name | Value |
+---------------+------------+
| version | 5.6.22-log |
+---------------+------------+[root@vdbsrv4 ~]# masterha_manager --version
masterha_manager version 0.56.###MHA配置信息
[root@vdbsrv4 ~]$ more /etc/masterha/app1.cnf
[server default]
manager_workdir=/var/log/masterha/app1
manager_log=/var/log/masterha/app1/manager.loguser=mha
password=xxx
ssh_user=root
repl_user=repl
repl_password=repl
ping_interval=1
shutdown_script=""
master_ip_online_change_script=""
report_script=""
master_ip_failover_script=/tmp/master_ip_failover

[server1]
hostname=vdbsrv1
master_binlog_dir=/data/mysqldata[server2]
hostname=vdbsrv2
master_binlog_dir=/data/mysqldata[server3]
hostname=vdbsrv3
master_binlog_dir=/data/mysqldata/
#candidate_master=12、测试VIP切换
###测试VIP（192.168.1.13）是否被启用
[root@vdbsrv4 ~]# ping 192.168.1.13
PING 192.168.1.13 （192.168.1.13） 56（84） bytes of data.
From 192.168.1.12 icmp_seq=10 Destination Host Unreachable###为主机vdbsrv1添加VIP
[root@vdbsrv4 ~]# ssh vdbsrv1 "/sbin/ifconfig eth0:0 192.168.1.13 netmask 255.255.255.0 up"###校验VIP是否成功启用
[root@vdbsrv4 ~]# ping 192.168.1.13
PING 192.168.1.13 （192.168.1.13） 56（84） bytes of data.
64 bytes from 192.168.1.13: icmp_seq=1 ttl=64 time=1.82 ms###开启MHA
[root@vdbsrv4 ~]# masterha_manager --conf=/etc/masterha/app1.cnf &###模拟主库宕机
[root@vdbsrv4 ~]# ssh vdbsrv1 "killall -r mysqld"###查看管理节点日志，可以看到VIP已经漂移
[root@vdbsrv4 ~]# grep VIP /var/log/masterha/app1/manager.log
Disabling the VIP on old master: vdbsrv1
Enabling the VIP - 192.168.1.13/24 on the new master - vdbsrv2###验证VIP是否位于节点vdbsrv2
[root@vdbsrv4 ~]# ssh vdbsrv2 "ifconfig |grep 1.13 -B1"
eth0:0 Link encap:Ethernet HWaddr 00:0C:29:5F:B2:EB
inet addr:192.168.1.13 Bcast:192.168.1.255 Mask:255.255.255.0######查看管理节点MHA切换日志
[root@vdbsrv4 ~]# tail /var/log/masterha/app1/manager.log
Invalidated master IP address on vdbsrv1（192.168.1.6:3306）
The latest slave vdbsrv2（192.168.1.7:3306） has all relay logs for recovery.
Selected vdbsrv2（192.168.1.7:3306） as a new master.
vdbsrv2（192.168.1.7:3306）: OK: Applying all logs succeeded.
vdbsrv2（192.168.1.7:3306）: OK: Activated master IP address.
vdbsrv3（192.168.1.8:3306）: This host has the latest relay log events.
Generating relay diff files from the latest slave succeeded.
vdbsrv3（192.168.1.8:3306）: OK: Applying all logs succeeded. Slave started, replicating from vdbsrv2（192.168.1.7:3306）
vdbsrv2（192.168.1.7:3306）: Resetting slave info succeeded.
Master failover to vdbsrv2（192.168.1.7:3306） completed successfully.3、VIP切换perl脚本[root@vdbsrv4 app1]# more /tmp/master_ip_failover
#！/usr/bin/env perluse 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 = "192.168.1.13/24";
my $key = "0";
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";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" => $new_master_port,
）;exit &main（）;sub main { print " IN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip=== "; if （ $command eq "stop" || $command eq "stopssh" ） { my $exit_code = 1;
eval {
print "Disabling the VIP on old master: $orig_master_host ";
&stop_vip（）;
$exit_code = 0;
};
if （$@） {
warn "Got Error: $@ ";
exit $exit_code;
}
exit $exit_code;
}
elsif （ $command eq "start" ） { my $exit_code = 10;
eval {
print "Enabling the VIP - $vip on the new master - $new_master_host ";
&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 ";
exit 0;
}
else {
&usage（）;
exit 1;
}
}sub start_vip（） {
`ssh $ssh_user@$new_master_host " $ssh_start_vip "`;
}
sub stop_vip（） {
return 0 unless （$ssh_user）;
`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=port --new_master_host=host --new_master_ip=ip --new_master_port=port ";
} 本文永久更新链接地址