【Mysql】MHA配置虚拟ip

虚拟ip飘逸

1. 说到Failover，通常有两种方式：一种是虚拟IP地址，一种是全局配置文件。
   
2. MHA并没有限定使用哪一种方式，而是让用户自己选择，虚拟IP地址的方式会牵扯到其它的软件，这里就不赘述了
3. 上篇文章搭建mha+keepalive就是通过keepalive来控制虚拟ip，本片文章在介绍一种虚拟ip的方式

配置虚拟ip

1. 采用ifconfig的方式
2. /sbin/ifconfig eth0:1 192.168.6.66/24
   

删除VIP:

1. /sbin/ifconfig eth0:1 down

网上找了一个master_ip_failover脚本就是用此方法更改VIP:

1. [root@localhost app1]# more /usr/local/bin/master_ip_online_change_script
   
2. #!/usr/bin/env perl
3. use strict;
4. use warnings FATAL => ‘all’;
6. use Getopt::Long;
8. my (
9.     $command, $ssh_user, $orig_master_host, $orig_master_ip,
10.     $orig_master_port, $new_master_host, $new_master_ip, $new_master_port
11. );
13. my $vip = ‘192.168.6.66/24’; # Virtual IP
14. my $key = “1”;
15. my $ssh_start_vip = “/sbin/ifconfig eth0:$key $vip”;
16. my $ssh_stop_vip = “/sbin/ifconfig eth0:$key down”;
18. GetOptions(
19.     ‘command=s’ => \$command,
20.     ‘ssh_user=s’ => \$ssh_user,
21.     ‘orig_master_host=s’ => \$orig_master_host,
22.     ‘orig_master_ip=s’ => \$orig_master_ip,
23.     ‘orig_master_port=i’ => \$orig_master_port,
24.     ‘new_master_host=s’ => \$new_master_host,
25.     ‘new_master_ip=s’ => \$new_master_ip,
26.     ‘new_master_port=i’ => \$new_master_port,
27. );
29. exit &main();
31. sub main {
33.     print “\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n”;
35.     if ( $command eq “stop” || $command eq “stopssh” ) {
37.         # $orig_master_host, $orig_master_ip, $orig_master_port are passed.
38.         # If you manage master ip address at global catalog database,
39.         # invalidate orig_master_ip here.
40.         my $exit_code = 1;
41.         eval {
42.             print “Disabling the VIP on old master: $orig_master_host \n”;
43.             &stop_vip();
44.             $exit_code = 0;
45.         };
46.         if ($@) {
47.             warn “Got Error: $@\n”;
48.             exit $exit_code;
49.         }
50.         exit $exit_code;
51.     }
52.     elsif ( $command eq “start” ) {
54.         # all arguments are passed.
55.         # If you manage master ip address at global catalog database,
56.         # activate new_master_ip here.
57.         # You can also grant write access (create user, set read_only=0, etc) here.
58.         my $exit_code = 10;
59.         eval {
60.             print “Enabling the VIP – $vip on the new master – $new_master_host \n”;
61.             &start_vip();
62.             $exit_code = 0;
63.         };
64.         if ($@) {
65.             warn $@;
66.             exit $exit_code;
67.         }
68.         exit $exit_code;
69.     }
70.     elsif ( $command eq “status” ) {
71.         print “Checking the Status of the script.. OK \n”;
72.         `ssh $ssh_user\@cluster1 \” $ssh_start_vip \”`;
73.         exit 0;
74.     }
75.     else {
76.         &usage();
77.         exit 1;
78.     }
79. }
81. # A simple system call that enable the VIP on the new master
82. sub start_vip() {
83.     `ssh $ssh_user\@$new_master_host \” $ssh_start_vip \”`;
84. }
85. # A simple system call that disable the VIP on the old_master
86. sub stop_vip() {
87.     `ssh $ssh_user\@$orig_master_host \” $ssh_stop_vip \”`;
88. }
90. sub usage {
91.     print
92.     “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=po
    
93. rt\n”;
94. }

将此脚本复制两次到/usr/local/bin, 分别命名为master_ip_failover 和master_ip_online_change_script

然后将/etc/app1.cnf 中下面两行注释去掉：

master_ip_failover_script=/usr/local/bin/master_ip_failover
master_ip_online_change_script=/usr/local/bin/master_ip_online_change_script

实验

1. 1.主库（115）添加一个vip

1. [root@node2 .ssh]# /sbin/ifconfig eth0:1 192.168.6.66/24
   [root@node2 .ssh]# ip a
   1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue 
       link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
       inet 127.0.0.1/8 scope host lo
       inet6 ::1/128 scope host 
          valid_lft forever preferred_lft forever
   2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
       link/ether 08:00:27:03:1b:a1 brd ff:ff:ff:ff:ff:ff
       inet 192.168.6.115/24 brd 192.168.6.255 scope global eth0
       inet 192.168.6.66/24 brd 192.168.6.255 scope global secondary eth0:1
       inet6 fe80::a00:27ff:fe03:1ba1/64 scope link 
          valid_lft forever preferred_lft forever
2. 
   

1. 2.关闭主库mysql

1. [root@node2 .ssh]# /etc/init.d/mysqld stop
   Stopping mysqld:                                           [  OK  ]
   [root@node2 .ssh]# ip a
   1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue 
       link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
       inet 127.0.0.1/8 scope host lo
       inet6 ::1/128 scope host 
          valid_lft forever preferred_lft forever
   2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
       link/ether 08:00:27:03:1b:a1 brd ff:ff:ff:ff:ff:ff
       inet 192.168.6.115/24 brd 192.168.6.255 scope global eth0           —vip飘走了
       inet6 fe80::a00:27ff:fe03:1ba1/64 scope link 
          valid_lft forever preferred_lft forever

1. 3 查看newmaster（114）的ip                                                    —-vip已飘到new master上了

1. [root@node1 ~]# ip a
   1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue 
       link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
       inet 127.0.0.1/8 scope host lo
       inet6 ::1/128 scope host 
          valid_lft forever preferred_lft forever
   2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
       link/ether 08:00:27:7a:c6:9c brd ff:ff:ff:ff:ff:ff
       inet 192.168.6.114/24 brd 192.168.6.255 scope global eth0
       inet 192.168.6.66/24 brd 192.168.6.255 scope global secondary eth0:1
       inet6 fe80::a00:27ff:fe7a:c69c/64 scope link 
          valid_lft forever preferred_lft forever

2. 4 重构mysql.重启mha监控
3. 5 关闭114mysql，vip飘回115上去了