mysql中MHA如何搭建

这篇文章主要为大家展示了“mysql中MHA如何搭建”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“mysql中MHA如何搭建”这篇文章吧。

操作系统 ：
debian5.0.2

数据库版本：
mysql5.0.51a

结构：
manager : 192.168.1.136(M1)

master : 192.168.1.20:3306(N1)
slave1 :  192.168.1.20:3307(N2)
slave2 :  192.168.1.20:3308(N3)
slave3 :  192.168.1.20:3309(N4)

软件包准备：
mha4mysql-manager_0.55-1_all.deb(还有对应的二进制包，源码包)
mha4mysql-node_0.54-1_all.deb

准备就绪：
①安装依赖包
apt-get install libdbd-mysql-perl
apt-get install libconfig-tiny-perl
apt-get install liblog-dispatch-perl
apt-get install libparallel-forkmanager-perl
centos版(yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager)

②安装mha manager包和node包
M1：dpkg -i mha4mysql-manager_0.55-1_all.deb
N1：dpkg -i mha4mysql-node_0.54-1_all.deb
N2：dpkg -i mha4mysql-node_0.54-1_all.deb
N3：dpkg -i mha4mysql-node_0.54-1_all.deb
N4：dpkg -i mha4mysql-node_0.54-1_all.deb

③主机信任(由于公司环境的原因，这里使用的是mysql用户)
M1:
#su mysql
#ssh-keygen -t rsa
#cat ~/.ssh/id_rsa.pub
将公钥内容添加到N1,N2,N3,N4的对应用户(这里是mysql用户)下的./ssh/authorized_keys下即可实现M1到N1,N2,N3,N4的免密登录。
另外，这里踩了个坑，就是免密登录的server端(N1,N2,N3,N4)即/etc/ssh/sshd_config文件必须开启公钥登录

免密登录的client端(M1)即/etc/ssh/ssh_config文件不能关闭公钥登录(这个参数设置之后在公司环境下貌似还是不能免密登录，最后用了默认配置就可以了)

N1,N2,N3,N4节点之间也互相信任

2016-12-4 22:44:12 ADD
ssh客户端得注释以下参数 才能免密登录
PreferredAuthentications password

③新建mysql mha管理账户，mysql repl复制用户

④新建mha工作目录
M1 ：mkdir -p /opt/mha_manager/log  chown -R mysql /opt/mha_manager
N1~N4：mkdir -p /opt/mha_node        chown -R mysql /opt/mha_node

⑤配置manager
M1:
#mkdir  -p /etc/mha
#cat /etc/mha/app1.conf

• manager_workdir=/opt/mha_manager_work

• manager_log=/opt/mha_manager_work/log/app1.log

• remote_workdir=/opt/mha_node

• 对以上的配置文件更改属主为ssh信任账户(这里是mysql)

• 另外(源码安装的mysql注意)：

•     mha远程登录操作mysql的时候默认用不到/usr/local/mysql/bin下面的mysql 以及 mysqlbinlog会报相应的错误信息，

• 这个时候我们需要做如下操作

• #ln -s /usr/local/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog

• #ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql

• ④开启manager



• 这里要注意的是，不要后台启动，即不要以 masterha_manager –conf=/etc/mha/app1.conf & 形式启动，不然会报错退出。我们前台启动，然后ctrl+z , bg放入后台。

• 至此，整个搭建过程完毕。

• 注意事项：

• ①slave最好设置 read_only=1 relay_log_purge=0,利用定时任务删除relay_log;

• ②mha进行failover之后会在app1.log中记录相应的chang master to master_xxx等信息，因此我们可以通过这条信息手动将

• 所宕master

• 连接到新主;

• ③可以使用(masterha_master_switch –master_state=alive –conf=/etc/mha/app1.cnf)进行手动切换主，然后将新主手动添加作为老主的从(步骤2)，注意mha manager必须处于关闭状态(masterha_check_status –conf=xxx);

• ④我们可以在app1.conf配置主库宕机后vip的飘逸脚本(

• master_ip_failover_script=/usr/bin/masterha_ip_failover

• )，但是第一次必须得自己手动在master添加vip.

• 附 masterha_ip_failover脚本

点击(此处)折叠或打开

1. #!/usr/bin/env perl

3. #  Copyright (C) 2011 DeNA Co.,Ltd.

4. #

5. #  This program is free software; you can redistribute it and/or modify

6. #  it under the terms of the GNU General Public License as published by

7. #  the Free Software Foundation; either version 2 of the License, or

8. # (at your option) any later version.

9. #

10. #  This program is distributed in the hope that it will be useful,

11. #  but WITHOUT ANY WARRANTY; without even the implied warranty of

12. #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13. #  GNU General Public License for more details.

14. #

15. #  You should have received a copy of the GNU General Public License

16. #   along with this program; if not, write to the Free Software

17. #  Foundation, Inc.,

18. #  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

20. ## Note: This is a sample script and is not complete. Modify the script based on your environment.

22. use strict;

23. use warnings FATAL => 'all';

25. use Getopt::Long;

27. my (

28.     $command, $ssh_user, $orig_master_host, $orig_master_ip,

29.     $orig_master_port, $new_master_host, $new_master_ip, $new_master_port

30. );

32. my $vip = '192.168.1.111/24';

33. my $key = '0';

34. my $ssh_start_vip = "sudo /sbin/ifconfig eth2:$key $vip";

35. my $ssh_stop_vip = "sudo /sbin/ifconfig eth2:$key down";

36. #my $ssh_Bcast_arp = "/usr/bin/arping -c 3 -A 10.1.99.233"; #ARP回复模式，更新邻居。要是不加则服务器会自动等到vip缓存失效，期间VIP会有一定时间的不可用。

38. GetOptions(

39.     'command=s' => /$command,

40.     'ssh_user=s' => /$ssh_user,

41.     'orig_master_host=s' => /$orig_master_host,

42.     'orig_master_ip=s' => /$orig_master_ip,

43.     'orig_master_port=i' => /$orig_master_port,

44.     'new_master_host=s' => /$new_master_host,

45.     'new_master_ip=s' => /$new_master_ip,

46.     'new_master_port=i' => /$new_master_port,

47. );

49. exit &main();

51. sub main {

53.     print "/n/nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===/n/n";

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

57.         my $exit_code = 1;

58.         eval {

59.             print "Disabling the VIP on old master: $orig_master_host /n";

60.             &stop_vip();

61.             $exit_code = 0;

62.         };

63.         if ($@) {

64.             warn "Got Error: $@/n";

65.             exit $exit_code;

66.         }

67.         exit $exit_code;

68.     }

69.     elsif ( $command eq "start" ) {

71.         my $exit_code = 10;

72.         eval {

73.             print "Enabling the VIP – $vip on the new master – $new_master_host /n";

74.             &start_vip();

75.            # &start_arp();

76.             $exit_code = 0;

77.         };

78.         if ($@) {

79.             warn $@;

80.             exit $exit_code;

81.         }

82.         exit $exit_code;

83.     }

84.     elsif ( $command eq "status" ) {

85.         print "Checking the Status of the script.. OK /n";

86.         exit 0;

87.     }

89.     else {

90.         &usage();

91.         exit 1;

92.     }

93. }

95. sub start_vip() {

96.     `ssh -p56000 $ssh_user/@$new_master_host /" $ssh_start_vip /"`;

97. }

98. #sub start_arp() {

99. #    `ssh $ssh_user/@$new_master_host /" $ssh_Bcast_arp /"`;

100. #}

101. sub stop_vip() {

102.     `ssh -p56000 $ssh_user/@$orig_master_host /" $ssh_stop_vip /"`;

103. }

105. sub usage {

106.   print

107. "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/n";

108. }

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