How to Set Up RHEL 8 Keepalived HAProxy for High Availability

Learn how to configure RHEL 8 Keepalived HAProxy for high availability and load balancing with clear commands and practical setup steps. Our Live Support Team is always here to help you.

How to Set Up RHEL 8 Keepalived HAProxy for High Availability

Building a reliable load balancing setup on RHEL 8 Keepalived HAProxy isn’t rocket science, but it does require a clean plan. Many admins look for a quick, clear way to ensure uptime and distribute traffic effectively without overcomplicating things. In this post, I’ll walk you through how to get your high-availability (HA) setup running using Keepalived and HAProxy on RHEL 8, without skipping a single command or configuration detail.

What RHEL 8 Keepalived HAProxy Does

Simply put, RHEL 8 Keepalived HAProxy lets you build a high-availability load balancer. It distributes network traffic across backend servers to improve performance, maintain redundancy, and ensure fault tolerance. It’s the kind of setup you need if uptime and failover matter to your business.

Getting Started on the Right Foot

Before diving in, install RHEL 8 on your servers and make sure they’re all properly networked. The smoother your base configuration, the better your HA setup will run later. Now, here’s how to put the pieces together.

Setting Up HAProxy

Start by installing HAProxy on your servers. It’s the heart of your traffic distribution system. Configure it to direct incoming requests to your backend servers. Each backend can be a web server, app server, or any other system hosting your services.

Don’t forget to include health checks in your HAProxy config so only healthy servers handle live traffic. This way, failed nodes won’t affect uptime.

Bringing Keepalived into the Mix

Next, install Keepalived. This one manages the virtual IP (VIP), the public-facing address your users will connect to. Keepalived ensures that even if one load balancer fails, another takes over immediately using the VIP.

Also, configure Keepalived to watch the health of HAProxy. If an HAProxy instance goes down, Keepalived triggers an automatic failover to keep services online.

Setting Up Your Backend Cluster

You’ll need a cluster of backend servers that actually handle the workload. Depending on your setup, these might be web, database, or API servers. The load balancer (HAProxy) just distributes traffic, your backends do the real processing.

Checking Installed Packages and Documentation

For reference, RHEL 8 Keepalived HAProxy comes with useful docs under /usr/share/doc. Let’s verify the versions and access the manual if needed:

# rpm -qf /usr/share/doc/keepalived/

keepalived-2.1.5-8.el8.x86_64

# rpm -qf /usr/share/doc/haproxy/

haproxy-1.8.27-5.el8.x86_64

# cat /usr/share/doc/haproxy/VERSION

1.8.27

# head -15 /usr/share/doc/haproxy/configuration.txt

----------------------

HAProxy

Configuration Manual

----------------------

version 1.8

willy tarreau

2020/11/06

Diagnostics and Maintenance

If you ever need to troubleshoot, start with those same documentation directories. They’re installed automatically with the RPM packages, and they’ll help you understand default settings and available parameters.

Also, keep in mind that consistent monitoring through Keepalived is key. If something’s off, Keepalived takes control of the VIP and fails over without downtime, one of the main reasons this setup is trusted in production environments.

Conclusion

So there you go, a complete RHEL 8 Keepalived HAProxy setup that’s practical, stable, and battle-tested. With HAProxy handling traffic and Keepalived ensuring failover, you’ll have a robust high-availability system ready to take real-world load.

When you’re done setting it up, test your failover, monitor your logs, and fine-tune the configuration based on your traffic patterns. Once you see it running smoothly, you’ll realize this setup is one of the best ways to keep your services always available and performing consistently.