===== 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 

<code>
! 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
    }
}
</code>

=== Keepalived configuration on slave machine ===

<code>
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
    }
}
</code>

[[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

''systemctl restart keepalived''