Setup Active-Passive Cluster with Keepalived & HAProxy (Two raspberry pis)

UPDATE: I made a mistake on 14:24 to the config thanks for everyone for letting me know. All instances should have the same virtual_router_id. So the secondary should have 101 instead of 102. I got lucky and worked because I assigned different priorities. Sorry for the confusion. Thanks to JR E and Parth Patel for catching the mistake Red hat doc https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/load_balancer_administration/ch-initial-setup-vsa Keepalived is a routing software written in C that provides simple and robust facilities for loadbalancing and high-availability to Linux systems. In this video we will talk about this technology and implement it along side HAProxy as a high availability (failover) Chapters 0:00 Intro 2:10 What is failover? 4:30 What are we building 7:20 KeepAlived Example * What is Keepalived? * Setup Keepalived with HAProxy * VRRP/VIP * Two rapsberrypis with keepalived and haproxy sudo apt-get install keepalived sudo vim /etc/keepalived/keepalived.conf vrrp_instance pi1 { state MASTER interface eth0 virtual_router_id 101 priority 100 authentication { auth_type PASS auth_pass 1234 } virtual_ipaddress { 192.168.254.100 } } vrrp_instance pi2 { state BACKUP interface wlan0 virtual_router_id 101 priority 200 authentication { auth_type PASS auth_pass 1234 } virtual_ipaddress { 192.168.254.100 } } Red HAT Doc https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/load_balancer_administration/ch-initial-setup-vsa Stay Awesome, Hussein