Keepalived set the master not to recapture the VIP after fault recovery (it is invalid to solve nopreempt)

Be careful ： Be sure to turn off the firewall test first , First, we can ensure that the test passes .

If the server must use a firewall , Then after the test is correct , Run... By command VRRP Routing redundancy protocol .

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         Allow multicast , Both devices need to perform 
        
iptables -A INPUT -d 224.0.0.18 -j ACCEPT
        
 Or modify ：vim /etc/sysconfig/iptables
        
 Add rows in place ：
        
-A INPUT -d 224.0.0.18 -j ACCEPT
       
       

        
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By default keepalived There is a master server （master, Later it will be called M The server ）, A standby server （backup, Later it will be called B The server ）. Under normal circumstances M The server takes over VIP Become 【 Lord 】, When M When the server goes down ,B The server takes over VIP Become 【 Lord 】, The effect of disaster recovery has been achieved , If M The server is back to normal again , that M The server will recover VIP Become 【 Lord 】 B The server becomes 【 To prepare 】.

The core configuration is as follows , Configuration here is incomplete , We need to pay attention to ：

Master To configure

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        vrrp_instance VI_1 {
        
    state MASTER
        
    interface eno16777736
        
    virtual_router_id 51
        
    priority 100
        
    advert_int 1
        
    authentication {
        
        auth_type PASS
        
        auth_pass 1111
        
    }
        
    virtual_ipaddress {
        
        192.168.80.120
        
    }
        
    #notify_master /home/keepshell/notify_master.sh
        
    #notify_backup /home/keepshell/notify_backup.sh
        
    #notify_fault  /home/keepshell/notify_fault.sh
        
    #notify_stop   /home/keepshell/notify_stop.sh
        
}
       
       

        
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Backup To configure

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        vrrp_instance VI_1 {
        
    state BACKUP
        
    interface eno16777736
        
    virtual_router_id 51
        
    nopreempt
        
    priority 90
        
    advert_int 1
        
    authentication {
        
        auth_type PASS
        
        auth_pass 1111
        
    }
        
    virtual_ipaddress {
        
        192.168.80.120
        
    }
        
   #notify_master /home/keepshell/notify_master.sh
        
   #notify_backup /home/keepshell/notify_backup.sh
        
   #notify_fault  /home/keepshell/notify_fault.sh
        
   #notify_stop   /home/keepshell/notify_stop.sh
        
}
       
       

        
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Sometimes we need M Do not take over again after the server returns to normal VIP, Give Way B The server continues to be 【 Lord 】   Let later return to normal M The server is 【 To prepare 】.

modify Master To configure , Backup The configuration of the server remains unchanged .

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        vrrp_instance VI_1 {
        
    state BACKUP
        
    interface eno16777736
        
    virtual_router_id 51
        
    priority 100
        
    nopreempt
        
    advert_int 1
        
    authentication {
        
        auth_type PASS
        
        auth_pass 1111
        
    }
        
    virtual_ipaddress {
        
        192.168.80.120
        
    }
        
    notify_master /home/keepshell/notify_master.sh
        
    notify_backup /home/keepshell/notify_backup.sh
        
    notify_fault  /home/keepshell/notify_fault.sh
        
    notify_stop   /home/keepshell/notify_stop.sh
        
}
       
       

        
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state MASTER It is amended as follows  state BACKUP  nopreempt   Set not to snatch VIP

you 're right , modify M,B Server's  state BACKUP All for 【 To prepare 】 type , Simultaneous setting  nopreempt   Set not to snatch VIP, And then start M The server ,M The server will become 【 Lord 】,

Then start B The server , because M High priority 【priority 100】 therefore B Won't rob VIP, At this time M Downtime ,B Become 【 Lord 】, next M Back to normal , Due to the nopreempt therefore M Won't rob VIP,B Continue for 【 Lord 】 and M by 【 To prepare 】.

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