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防止 master 发生故障后回退到 master

tag-icon • tag-icon lvs keepalived
防止 master 发生故障后回退到 master

我正在使用 keepalived 设置指向主服务器的虚拟 IP。发生故障转移时，它应该将虚拟 IP 指向备份服务器，并且该 IP 应该一直保留在那里，直到我手动启用（修复）主服务器。

这很重要，因为我在服务器上运行 mysql 复制，并且写入只能在主服务器上进行。当我进行故障转移时，我会将从服务器提升为主服务器。

主服务器：

  global_defs {
    ! this is who emails will go to on alerts
     notification_email {
           [email protected]
     ! add a few more email addresses here if you would like
   }
   notification_email_from [email protected] 

   ! I use the local machine to relay mail
   smtp_server 127.0.0.1
   smtp_connect_timeout 30

   ! each load balancer should have a different ID
   ! this will be used in SMTP alerts, so you should make
   ! each router easily identifiable
    lvs_id APP1         
} 

vrrp_instance APP1 {
         interface eth0
         state EQUAL
         virtual_router_id 61
         priority 999
    nopreempt
         virtual_ipaddress {
             217.x.x.129
         }

    smtp_alert
}

备份服务器：

 global_defs {
   ! this is who emails will go to on alerts
   notification_email {
       [email protected]
   ! add a few more email addresses here if you would like
  }
  notification_email_from [email protected] 

  ! I use the local machine to relay mail
  smtp_server 127.0.0.1
  smtp_connect_timeout 30

  ! each load balancer should have a different ID
  ! this will be used in SMTP alerts, so you should make
  ! each router easily identifiable
   lvs_id APP2           
   } 

vrrp_instance APP2 {
    interface eth0
    state EQUAL
    virtual_router_id 61   
  priority 100            
    virtual_ipaddress {
        217.xx.xx.129
    }

notify_master "/etc/keepalived/notify.sh del app2"
notify_backup "/etc/keepalived/notify.sh add app2"
notify_fault "/etc/keepalived/notify.sh add app2”
smtp_alert
}

答案1

我遇到了和你一样的问题。通过设置解决了不抢占在两个 keepalived 服务器上，并且（根据http://article.gmane.org/gmane.linux.keepalived.devel/1537）将两个服务器都设置为备份（具有不同的优先级）。

效果很好！:-)

答案2

这可能不是最优雅的解决方案，但您不能在主服务器上的脚本中停止 keepalived 吗notify_backup？notify_fault这样，您必须重新启动它才能再次获得控制权。

类似这样的：

notify_backup "/etc/init.d/keepalived stop"
notify_fault "/etc/init.d/keepalived stop"

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