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Set up Keepalived VIP on RockyLinux

Install package

On both nodes:

dnf install keepalived

Base config

On both nodes:

vim /etc/sysctl.d/99-sysctl.conf
net.ipv4.ip_nonlocal_bind=1
sysctl -p

firewall-cmd --add-rich-rule='rule protocol value="vrrp" accept' --permanent
firewall-cmd --reloa

On master node

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     toto@toto.com
   }
   notification_email_from toto@toto.com
   smtp_server smtp.toto.com
   smtp_connect_timeout 30
   router_id VIP_TOTO
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER
    interface ens18
    virtual_router_id 51
    priority 101
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.1
    }
}

On backup node

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     toto@toto.com
   }
   notification_email_from toto@toto.com
   smtp_server smtp.toto.com
   smtp_connect_timeout 30
   router_id VIP_TOTO
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens18
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.1
    }
}

On both nodes

systemctl enable --now keepalived

Then check ip addresses