Failover Keepalive Manually Using Dummy Interface

Create Dummy Interface

echo "modprobe dummy" >/etc/sysconfig/modules/rcsysinit.modules
 chmod +x /etc/sysconfig/modules/rcsysinit.modules
 modprobe -a dummy

Create network file for dummy module in /etc/sysconfig/network-scripts/ifcfg-dummy0

DEVICE=dummy0
 BOOTPROTO=none
 IPV6INIT=no
 NAME="dummy0"
 ONBOOT=yes
 TYPE=Ethernet
 USERCTL=no
 NM_CONTROLLED="no"

Start dummy0 interface

ifup dummy0

Install Keepalived in Both Server Maaster and Slave Node

Add track for interface dummy0 in vrrpd.conf or in keepalived.

track_interface {
   ens160
   dummy0
 }

or we can add in keepalived config in /etc/keepalived/keepalived.conf in master node

global_defs {
   notification_email {
     admin@roomit.tech
   }
   notification_email_from madangkara@roomit.tech
   smtp_server localhost
   smtp_connect_timeout 30
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 101
    advert_int 1
    track_interface {
        eth0
        dummy0
    }
    virtual_ipaddress {
        10.32.16.73
    }
}

and then we add config in slave node /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     admin@roomit.tech
   }
   notification_email_from singasari@roomit.tech
   smtp_server localhost
   smtp_connect_timeout 30
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    track_interface {
        eth0
        dummy0
    }

    virtual_ipaddress {
        10.32.16.73
    }
}

How to switch IP or move ip virtual to slave node? just shutdown dummy0 in maste node

ifdown dummy0

and switch on dummy0 in slave node

ifup dummy0