install keepalived

yum install -y gcc kernel-headers kernel-devel
yum install -y keepalived

 /etc/keepalived/keepalived.conf
 
 ! Configuration File for keepalived

global_defs {
   notification_email {
     sysadmin@mydomain.com
     support@mydomain.com
   }
   notification_email_from srv@mydomain.com
   smtp_server localhost
   smtp_connect_timeout 30
}

vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 101 #priorité 101 pour le master et 100 pour les autres
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.16.1.40
    }
}

net.ipv4.conf.default.rp_filter = 0 
net.ipv4.conf.all.rp_filter = 0

systemctl start keepalived
systemctl enable keepalived

 ip addr show ens160
 2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:0c:29:1c:2c:8a brd ff:ff:ff:ff:ff:ff
    inet 172.16.1.31/24 brd 172.16.1.255 scope global dynamic ens160
       valid_lft 5438sec preferred_lft 5438sec
    inet 172.16.1.40/32 scope global ens160
       valid_lft forever preferred_lft forever
    inet6 fe80::9469:27ec:25a5:5683/64 scope link
       valid_lft forever preferred_lft forever