iptables-rules

iptables -t mangle -A PREROUTING -d VIP.IP.ADDRESS/32 -p tcp -m tcp --dport 80 -j MARK --set-mark 80
iptables -t mangle -A PREROUTING -d VIP.IP.ADDRESS/32 -p tcp -m tcp --dport 443 -j MARK --set-mark 80

keepalived-virtual-server.conf

virtual_server fwmark 80 {
        delay_loop 5
        lb_kind NAT
        lb_algo lc
        persistence_timeout 600
        protocol TCP

        real_server SERVER.01.IP 0 {
               weight 1
                HTTP_GET {
                    url {
                        path /
                        status_code 200
                    }
                    connect_timeout 15
                    connect_port 80
                }
                SSL_GET {
                    url {
                        path /
                        status_code 200
                    }
                    connect_timeout 15
                    connect_port 443
                }
        }
        real_server SERVER.02.IP 0 {
               weight 1
                HTTP_GET {
                    url {
                        path /
                        status_code 200
                    }
                    connect_timeout 15
                    connect_port 80
                }
                SSL_GET {
                    url {
                        path /
                        status_code 200
                    }
                    connect_timeout 15
                    connect_port 443
                }
        }
}