Keepalived is a routing software written in C that can be used to setup load balancing and high availiability for Linux machines. NOTE: hypervisor is Debian 10 (Buster) with libvirt and qemu/kvm, virtual machines also are Debian 10 (Buster). Keepalived configuration Install keepalived: $ apt install keepalived Install nginx, it will be use to check that keepalived is actually working: $ apt install nginx $ systemctl enable --now nginx Configure keepalived: $ vi /etc/keepalived/keepalived.conf --- global_defs { enable_script_security # prevents tampering with the check script script_user root # defines which user runs the check script } vrrp_script chk_nginx { script "/opt/scripts/nginx-check.sh" interval 2 # run script every 2 seconds weight 2 # add 2 points if OK } vrrp_instance VI_1 { interface enp2s0 # interface to monitor virtual_router_id 51 priority 101 # MASTER 101, BACKUP 100 advert_int 1 nopreempt # comment to not have the VIP go back to MASTER # -> when it comes back online authentication { auth_type PASS auth_pass myPass # maximum 8 chars } virtual_ipaddress { 10.10.0.12/24 # VIP (Virtual IP Address) } track_script { chk_nginx } } Also add a script to check if nginx is alive and well: …