Building a highly available load balancer with keepalived and HAProxy

In this informative and hands-on tutorial, we'll guide you through the process of building a highly available load balancer using Keepalived and HAProxy. Load balancing is essential for distributing traffic across multiple servers, improving scalability, and ensuring high availability for your applications. Keepalived implements VRRP protocol, which allows multiple servers to work together as a virtual router. It assigns a virtual IP address to the group of servers, enabling seamless failover in case one of the servers becomes unavailable.. Keepalived monitors the health of servers within a cluster and automatically detects failures. In the event of a server failure, it triggers failover, ensuring that traffic is redirected to the remaining available servers. This enhances the reliability and availability of applications and services. Keepalived regularly checks the health and availability of servers by performing health checks. In this video we'll use script-based checks. It monitors the status of servers and triggers failover if a server fails these health checks. Keepalived provides a flexible and configurable framework. It allows you to define various parameters and options, such as timers, weights, and priorities, to customize the behavior of the load balancing and failover processes based on your specific requirements. Keepalived works in conjunction with load balancing software, such as HAProxy, to distribute incoming network traffic across multiple backend servers. It ensures that the load balancer operates with high availability and provides a robust infrastructure for scalable and reliable applications. 00:00 Introduction 01:35 Backend service in go 03:42 Backend in action 04:29 First load balancer 06:43 Second load balancer 08:35 VRRP 10:05 Check multicast support 11:06 Keepalived configuration 14:20 Failover 16:50 Healthcheck