Trisul Network Analytics
Developer Zone

Keepalived

Master IP : 10.179.210.103
Slave IP : 10.179.210.140
Virtual IP :10.179.210.100

Platforms

Oracle/RHEL/CentOS 8

To install Oracle 8 Application Stream repository

dnf install epel-release

dnf install keepalived

Keepalived configuration on master machine

Configuration file in /etc/keepalived/keepalived.conf Notice PRIORITY is 200 compared to slave node which has 100

! Configuration File for keepalived

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 200
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.179.210.100
    }
}

Keepalived configuration on slave machine

vrrp_instance VI_1 {
    state SLAVE
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.179.210.100
    }
}

https://tecadmin.net/ip-failover-setup-using-keepalived-on-centos-redhat/

Starting order

Make sure you start the MASTER first before the SLAVE node

systemctl restart keepalived

then on slave node