Learn how to set up Keepalived HAProxy check script. Our HAProxy Support team is here to help you with your questions and concerns.

Set up Keepalived HAProxy check script

Did you know that Keepalived and HAProxy can be used together for a highly available load-balancing solution?

In fact, Keepalived is responsible for managing the VIP and HAProxy is responsible for distributing traffic to the backend servers in this configuration.

In order to make sure that HAProxy functions correctly, a script is configured in Keepalived. This check script periodically verifies the HAProxy’s health and reports its status to Keepalived. In case the HAProxy is not functioning correctly, Keepalived will take an action, like transferring the VIP to another server and so on.

The check script can be written in any scripting language, like Bash, Python, or Perl. It verifies if HAProxy is running, listening on the correct port, as well as responding to requests correctly. If HAProxy is not functioning correctly, the check script exits with a non-zero status, indicating that Keepalived should take action.

Here is a quick look at the setup procedure for Keepalived and HAProxy with a check script:

1. First, install Keepalived and HAProxy on the servers via the package manager.
2. Next, configure the HAProxy configuration file and define the backend servers, the port to listen on, and any load balancing rules.
3. After that, write a script that checks if HAProxy is running, listening on the correct port, and responding to requests correctly. Furthermore, the script has to exit with a non-zero status if HAProxy is not functioning correctly.
4. Then, create a Keepalived configuration file and define the VIP, the backend servers, and the check script to use.
5. Now, we can start the Keepalived and HAProxy services on all servers.
6. Finally, test the setup by stopping HAProxy on the active server and verifying that Keepalived transfers the VIP to the standby server.

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Conclusion

In summary, our Support Techs demonstrated how to set up Keepalived HAProxy check script.