【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
   

1. /sbin/ifconfig eth0:1 down

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';
   
5. 
   
6. use Getopt::Long;
   
7. 
   
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. );
    
12. 
    
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";
    
17. 
    
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. );
    
28. 
    
29. exit &main();
    
30. 
    
31. sub main {
    
32. 
    
33. print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
    
34. 
    
35. if ( $command eq "stop" || $command eq "stopssh" ) {
    
36. 
    
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" ) {
    
53. 
    
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. }
    
80. 
    
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. }
    
89. 
    
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_failovermaster_ip_online_change_script=/usr/local/bin/master_ip_online_change_script

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: 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: 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: 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: 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: 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: 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