MySQL高可用之keepalived方案的示例分析

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实验环境
    mysql master   : 192.168.111.52
    mysql slave     : 192.168.111.53
    keepalived vip :  192.168.111.60
、搭建过程
    1.  mysql双主的构建
        ① 互相 change master 即可，此处省略该过程，着重讲下keepalived

    2. keepalived相关
        ①  yum -y install keepalived 安装keepalived
        ② [email protected]:~# keepalived -v
            Keepalived v1.2.7 (02/21,2013)

        ③ 编辑 /etc/keepalived/keepalived.conf   

点击(此处)折叠或打开

  1. [email protected]:keepalived# cat keepalived.conf

  2. ! Configuration File for keepalived

  4. global_defs {##全局配置

  5.    notification_email {

  6.      [email protected]                    #####邮件接收者

  7.    }

  8.    notification_email_from [email protected]    #####邮件发送者

  9.    smtp_server smtp.163.com               #####SMTP服务器

  10.    smtp_connect_timeout 30

  11.    router_id haMySQL                      #####routerID 同一组keepalived设置为相同

  12. }

  14. vrrp_script chk_mysql {##健康检测相关配置

  15.     script “/etc/keepalived/chk_mysql.sh” #####设置脚本 或者直命令  返回 0 则表示成功 >0 则表示失败， 详情可以后面的脚本内容

  16.     interval 1                            #####检测间隔

  17.     weight 2                              #####检测返回失败之后优先级会减少 2 (如果 master优先级100 ， slave 优先级 99 ,master检测失败则优先级为100-2 < 99 ，则slave会提升为主)

  18. }

  20. vrrp_instance VI_1 {

  21.     state MASTER                          ##### 设为master

  22.     interface eth2                        ##### 网卡设定

  23.     virtual_router_id 51                  ##### 针对该 instance的虚拟id  , 同一组 instance设置相同

  24.     priority 100                          ##### 优先级设定

  25.     advert_int 1                          ##### 检测时间间隔

  26.     authentication {

  27.         auth_type PASS                    ##### 同一组instance之间的认证方式为 PASS ,pass 为7777 ，必须相同(防止 有用户恶意伪造 vrrp)

  28.         auth_pass 7777

  29.     }

  30.     virtual_ipaddress {

  31.         192.168.111.60                    ##### 设置虚拟ip ,可以设置多个

  32.     }

  33.     

  34.     track_script {

  35.     chk_mysql                             ##### 表示该instance 使用chk_mysql进行相关检测

  36.     }

  37.   ##### 以下配置 在该实例 转换为 master,slave，或者出错的时候执行的脚本(可以设置邮件通知，或者处理一些其他问题)

  38.    # notify_master “/etc/keepalived/change_master.sh”

  39.    # notify_slave “/etc/keepalived/change_slave.sh”

  40.    # notify_fault “/etc/keepalived/change_fault.sh”

  41. }

  43. [email protected]:keepalived# cat keepalived.conf

  44. ! Configuration File for keepalived

  46. global_defs {

  47.    notification_email {

  48.      [email protected]

  49.    }

  50.    notification_email_from [email protected]

  51.    smtp_server smtp.163.com

  52.    smtp_connect_timeout 30

  53.    router_id haMySQL

  54. }

  56. vrrp_script chk_mysql {

  57.         script “/etc/keepalived/chk_mysql.sh”

  58.         interval 1

  59.         weight 2

  60. }

  62. vrrp_instance VI_1 {

  63.     state BACKUP                            ##### 该主机作为备机 BACKUP 

  64.     interface eth2

  65.     virtual_router_id 51

  66.     priority 99                             ##### 优先级设置 小于 master

  67.     advert_int 1

  68.     authentication {

  69.         auth_type PASS

  70.         auth_pass 7777

  71.     }

  72.     virtual_ipaddress {

  73.         192.168.111.60

  74.     }

  75.     

  76.     track_script {

  77.         chk_mysql

  78.     }

  79. }

  81. [email protected]:keepalived# cat chk_mysql.sh

  82. #!/bin/bash

  84. num=`ps -ef |grep mysqld | grep -v grep | wc -l`        ##### 查看mysqld进程数量 ， 正常情况有一个root起的mysqld_safe守护进程，还有一个属于mysql用户的mysqld进程

  85. [[ $num -eq 2 ]] && exit 0 || exit 1

    3. 故障模拟
       ① 启动 keepalived    

点击(此处)折叠或打开

  1. [email protected]:keepalived# tail /var/log/messages

  2. Apr 29 13:45:24 localhost Keepalived_healthcheckers[24184]: Registering Kernel netlink command channel

  3. Apr 29 13:45:24 localhost Keepalived_healthcheckers[24184]: Opening file ‘/etc/keepalived/keepalived.conf’.

  4. Apr 29 13:45:24 localhost Keepalived_healthcheckers[24184]: Configuration is using : 7417 Bytes

  5. Apr 29 13:45:24 localhost Keepalived_vrrp[24185]: Opening file ‘/etc/keepalived/keepalived.conf’.

  6. Apr 29 13:45:24 localhost Keepalived_vrrp[24185]: Configuration is using : 65552 Bytes

  7. Apr 29 13:45:24 localhost Keepalived_vrrp[24185]: Using LinkWatch kernel netlink reflector…

  8. Apr 29 13:45:24 localhost Keepalived_healthcheckers[24184]: Using LinkWatch kernel netlink reflector…

  9. Apr 29 13:45:25 localhost Keepalived_vrrp[24185]: VRRP_Script(chk_mysql) succeeded

  10. Apr 29 13:45:25 localhost Keepalived_vrrp[24185]: VRRP_Instance(VI_1) Transition to MASTER STATE

  11. Apr 29 13:45:26 localhost Keepalived_vrrp[24185]: VRRP_Instance(VI_1) Entering MASTER STATE

  13. [email protected]:keepalived# tailf /var/log/messages

  14. Apr 29 13:49:27 localhost Keepalived_healthcheckers[32569]: Registering Kernel netlink reflector

  15. Apr 29 13:49:27 localhost Keepalived_healthcheckers[32569]: Registering Kernel netlink command channel

  16. Apr 29 13:49:27 localhost Keepalived_vrrp[32570]: Opening file ‘/etc/keepalived/keepalived.conf’.

  17. Apr 29 13:49:27 localhost Keepalived_vrrp[32570]: Configuration is using : 65550 Bytes

  18. Apr 29 13:49:27 localhost Keepalived_vrrp[32570]: Using LinkWatch kernel netlink reflector…

  19. Apr 29 13:49:27 localhost Keepalived_healthcheckers[32569]: Opening file ‘/etc/keepalived/keepalived.conf’.

  20. Apr 29 13:49:27 localhost Keepalived_healthcheckers[32569]: Configuration is using : 7415 Bytes

  21. Apr 29 13:49:27 localhost Keepalived_vrrp[32570]: VRRP_Instance(VI_1) Entering BACKUP STATE

  22. Apr 29 13:49:27 localhost Keepalived_healthcheckers[32569]: Using LinkWatch kernel netlink reflector…

  23. Apr 29 13:49:27 localhost Keepalived_vrrp[32570]: VRRP_Script(chk_mysql) succeeded

    ip a 可以查看到 vip 192.168.111.60 在 192.168.111.52(master)上
    
    ② 关闭 111.52上面的mysql

点击(此处)折叠或打开

  1. [email protected]:keepalived# mysqladmin shutdown

  2. [email protected]:keepalived# tailf /var/log/messages

  3. Apr 29 14:19:30 localhost Keepalived_vrrp[24862]: VRRP_Script(chk_mysql) failed

  4. Apr 29 14:19:32 localhost Keepalived_vrrp[24862]: VRRP_Instance(VI_1) Received higher prio advert

  5. Apr 29 14:19:32 localhost Keepalived_vrrp[24862]: VRRP_Instance(VI_1) Entering BACKUP STATE

  7. [email protected]:keepalived# tailf /var/log/messages

  8. Apr 29 14:19:55 localhost Keepalived_vrrp[566]: VRRP_Instance(VI_1) forcing a new MASTER election

  9. Apr 29 14:19:56 localhost Keepalived_vrrp[566]: VRRP_Instance(VI_1) Transition to MASTER STATE

  10. Apr 29 14:19:57 localhost Keepalived_vrrp[566]: VRRP_Instance(VI_1) Entering MASTER STATE

    ip a 可以查看到 vip 192.168.111.60 在 192.168.111.53(master)上

    ③ 启动111.52上面的mysql

点击(此处)折叠或打开

  1. [email protected]:keepalived# mysqld_safe & ; tailf /var/log/messages

  2. Apr 29 14:24:21 localhost Keepalived_vrrp[24862]: VRRP_Script(chk_mysql) succeeded

  3. Apr 29 14:24:22 localhost Keepalived_vrrp[24862]: VRRP_Instance(VI_1) forcing a new MASTER election

  4. Apr 29 14:24:23 localhost Keepalived_vrrp[24862]: VRRP_Instance(VI_1) Transition to MASTER STATE

  5. Apr 29 14:24:24 localhost Keepalived_vrrp[24862]: VRRP_Instance(VI_1) Entering MASTER STATE

  7. [email protected]:keepalived# tailf /var/log/messages

  8. Apr 29 14:24:45 localhost Keepalived_vrrp[566]: VRRP_Instance(VI_1) Received higher prio advert

  9. Apr 29 14:24:45 localhost Keepalived_vrrp[566]: VRRP_Instance(VI_1) Entering BACKUP STATE

    ip a 可以查看到 vip 192.168.111.60 在 192.168.111.52(master)上，也就是说111.52会持续通过track_script的脚本检查 ，若成功的话会恢复原来的优先级100 ，便把vip抢过来了(若不希望优先级高的直接上来直接抢占vip的话 需要再instance 里面配置 nopreempt ,backup无需设置)

虚拟server
    以上是实验是通过 vrrp_script以及trace_script 实现优先级变换来实现故障转移的，现在看下 通过虚拟server怎么实现mysql的高可用
    ① 配置

点击(此处)折叠或打开

  1. [email protected]:keepalived# cat /etc/keepalived/keepalived.conf

  2. ! Configuration File for keepalived

  4. global_defs {

  5.    notification_email {

  6.      [email protected]

  7.    }

  8.    notification_email_from [email protected]

  9.    smtp_server smtp.shidc.taomee.com

  10.    smtp_connect_timeout 30

  11.    router_id haMySQL

  12. }

  14. vrrp_script chk_mysql {

  15.     script “/etc/keepalived/chk_mysql.sh”

  16.     interval 1

  17.     weight 2

  18. }

  20. vrrp_instance VI_1 {

  21.     state MASTER

  22.     interface eth2

  23.     virtual_router_id 51

  24.     priority 100

  25.     nopreempt

  26.     advert_int 1

  27.     authentication {

  28.         auth_type PASS

  29.         auth_pass 7777

  30.     }

  31.     virtual_ipaddress {

  32.         192.168.111.60

  33.     }

  34.     

  35. #    track_script {

  36. #    chk_mysql

  37. #    }

  38. }

  40. virtual_server 192.168.111.60 3306 {

  41.     delay_loop 6

  42.     persistence_timeout 300

  43.     protocol TCP

  46.     real_server 192.168.111.52 3306 {

  47.         weight 1

  48.         notify_down /etc/keepalived/kill_self.sh

  49.         TCP_CHECK {

  50.             tcp_port 3306

  51.             connect_timeout 3

  52.         }

  53.     }

  55. }

  57. [email protected]:keepalived# cat /etc/keepalived/keepalived.conf

  58. ! Configuration File for keepalived

  60. global_defs {

  61.    notification_email {

  62.      [email protected]

  63.    }

  64.    notification_email_from [email protected]

  65.    smtp_server smtp.shidc.taomee.com

  66.    smtp_connect_timeout 30

  67.    router_id haMySQL

  68. }

  70. vrrp_script chk_mysql {

  71.         script “/etc/keepalived/chk_mysql.sh”

  72.         interval 1

  73.         weight 2

  74. }

  76. vrrp_instance VI_1 {

  77.     state BACKUP

  78.     interface eth2

  79.     virtual_router_id 51

  80.     priority 99

  81.     advert_int 1

  82.     authentication {

  83.         auth_type PASS

  84.         auth_pass 7777

  85.     }

  86.     virtual_ipaddress {

  87.         192.168.111.60

  88.     }

  89.     

  90. #    track_script {    #########这里先注释掉 通过追踪脚本的检查

  91. #        chk_mysql

  92. #    }

  93. }

  95. virtual_server 192.168.111.60 3306 {

  96.     delay_loop 6

  97.     persistence_timeout 300

  98.     protocol TCP

  101.     real_server 192.168.111.53 3306 {### 真实 服务

  102.         weight 1                                    #### 权重，用来多真实服务 均衡使用

  103.         notify_down /etc/keepalived/kill_self.sh    ####在检查该服务不可用时执行该脚本(用来杀死 keepalived 实现 vip 飘逸)

  104.         TCP_CHECK {

  105.                 tcp_port 3306                       #### 检查端口 继承 real_server 192.168.111.53 3306 {### 真实 服务

  106.             connect_timeout 3                       #### tcp超时时间

  107.         }

  108.     }

  110. }

  112. [email protected].111.53:keepalived# cat /etc/keepalived/kill_self.sh

  113. #!/bin/bash

  114. killall keepalived

    ②启动keepalived

点击(此处)折叠或打开

  1. [email protected]:keepalived# keepalived

  2. [email protected]:keepalived# tailf /var/log/messages

  3. Apr 29 14:48:22 localhost Keepalived_vrrp[20482]: Opening file ‘/etc/keepalived/keepalived.conf’.

  4. Apr 29 14:48:22 localhost Keepalived_vrrp[20482]: Configuration is using : 64590 Bytes

  5. Apr 29 14:48:22 localhost Keepalived_vrrp[20482]: Using LinkWatch kernel netlink reflector…

  6. Apr 29 14:48:22 localhost Keepalived_healthcheckers[20481]: IPVS: Scheduler not found

  7. Apr 29 14:48:22 localhost kernel: IPVS: Scheduler module ip_vs_ not found

  8. Apr 29 14:48:22 localhost Keepalived_healthcheckers[20481]: IPVS: Service not defined

  9. Apr 29 14:48:22 localhost Keepalived_healthcheckers[20481]: Using LinkWatch kernel netlink reflector…

  10. Apr 29 14:48:22 localhost Keepalived_healthcheckers[20481]: Activating healthchecker for service [192.168.111.52]:3306

  11. Apr 29 14:48:23 localhost Keepalived_vrrp[20482]: VRRP_Instance(VI_1) Transition to MASTER STATE

  12. Apr 29 14:48:24 localhost Keepalived_vrrp[20482]: VRRP_Instance(VI_1) Entering MASTER STATE

  14. [email protected]:keepalived# keepalived

  15. [email protected]:keepalived# tailf /var/log/messages

  16. Apr 29 14:48:51 localhost Keepalived_healthcheckers[25092]: Configuration is using : 11673 Bytes

  17. Apr 29 14:48:51 localhost Keepalived_vrrp[25093]: Opening file ‘/etc/keepalived/keepalived.conf’.

  18. Apr 29 14:48:51 localhost Keepalived_vrrp[25093]: Configuration is using : 64568 Bytes

  19. Apr 29 14:48:51 localhost Keepalived_vrrp[25093]: Using LinkWatch kernel netlink reflector…

  20. Apr 29 14:48:51 localhost Keepalived_vrrp[25093]: VRRP_Instance(VI_1) Entering BACKUP STATE

  21. Apr 29 14:48:51 localhost kernel: IPVS: Scheduler module ip_vs_ not found

  22. Apr 29 14:48:51 localhost Keepalived_healthcheckers[25092]: IPVS: Scheduler not found

  23. Apr 29 14:48:51 localhost Keepalived_healthcheckers[25092]: IPVS: Service not defined

  24. Apr 29 14:48:51 localhost Keepalived_healthcheckers[25092]: Using LinkWatch kernel netlink reflector…

  25. Apr 29 14:48:51 localhost Keepalived_healthcheckers[25092]: Activating healthchecker for service [192.168.111.53]:3306

    此时 ip a 命令可以查看虚拟ip 111.60 在111.52(master) 上
   
    ③关闭 111.52上的mysql

点击(此处)折叠或打开

  1. [email protected]:keepalived# mysqladmin shutdown

  2. 2017-04-29T07:07:38.121123Z mysqld_safe mysqld from pid file /opt/mysql/mysqld.pid ended

  3. [1]+  Done                    mysqld_safe

  4. [email protected]:keepalived# tailf /var/log/messages

  5. Apr 29 15:07:31 localhost Keepalived_healthcheckers[23405]: TCP connection to [192.168.111.52]:3306 failed !!!

  6. Apr 29 15:07:31 localhost Keepalived_healthcheckers[23405]: Removing service [192.168.111.52]:3306 from VS [192.168.111.60]:3306

  7. Apr 29 15:07:31 localhost Keepalived_healthcheckers[23405]: IPVS: Service not defined

  8. Apr 29 15:07:31 localhost Keepalived_healthcheckers[23405]: Executing [/etc/keepalived/kill_self.sh] for service [192.168.111.52]:3306 in VS [192.168.111.60]:3306

  9. Apr 29 15:07:31 localhost Keepalived_healthcheckers[23405]: Lost quorum 1-0=1 > 0 for VS [192.168.111.60]:3306

  10. Apr 29 15:07:31 localhost Keepalived_healthcheckers[23405]: Remote SMTP server [0.0.0.0]:25 connected.

  11. Apr 29 15:07:31 localhost Keepalived[23404]: Stopping Keepalived v1.2.7 (02/21,2013)

  12. Apr 29 15:07:31 localhost Keepalived_healthcheckers[23405]: IPVS: No such service

  13. Apr 29 15:07:31 localhost Keepalived_vrrp[23406]: VRRP_Instance(VI_1) sending 0 priority

  15. [email protected]:keepalived# tailf /var/log/messages

  16. Apr 29 15:07:32 localhost Keepalived_vrrp[26815]: VRRP_Instance(VI_1) Transition to MASTER STATE

  17. Apr 29 15:07:33 localhost Keepalived_vrrp[26815]: VRRP_Instance(VI_1) Entering MASTER STATE

    此时 ip a 命令可以看到虚拟ip 111.60在111.53(新master)上

以上是“MySQL高可用之keepalived方案的示例分析”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注云搜网行业资讯频道！


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