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diff --git a/health/guides/haproxy/haproxy_backend_status.md b/health/guides/haproxy/haproxy_backend_status.md deleted file mode 100644 index 47be09c73..000000000 --- a/health/guides/haproxy/haproxy_backend_status.md +++ /dev/null @@ -1,49 +0,0 @@ -### Understand the alert - -This alert monitors the average number of failed HAProxy backends over the last 10 seconds. If you receive this alert in a critical state, it means that one or more HAProxy backends are inaccessible or offline. - -HAProxy is a reverse-proxy that provides high availability, load balancing, and proxying for TCP and HTTP-based applications. A backend in HAProxy is a set of servers that receive forwarded requests and are defined in the backend section of the configuration. - -### Troubleshoot the alert - -- Check the HAProxy configuration file for errors - - Making changes in the configuration file may introduce errors. Always validate the correctness of the configuration file. In most Linux distros, you can run the following check: - - ``` - haproxy -c -f /etc/haproxy/haproxy.cfg - ``` - -- Check the HAProxy service for errors - - 1. Use `journalctl` and inspect the log: - - ``` - journalctl -u haproxy.service --reverse - ``` - -- Check the HAProxy log - - 1. By default, HAProxy logs under `/var/log/haproxy.log`: - - ``` - cat /var/log/haproxy.log | grep 'emerg\|alert\|crit\|err\|warning\|notice' - ``` - - You can also search for log messages with `info` and `debug` tags. - -- Investigate the backend servers - - 1. Verify that the backend servers are online and accepting connections. - 2. Check the backend server logs for any errors or issues. - 3. Ensure that firewall rules or security groups are not blocking traffic from HAProxy to the backend servers. - -- Review the HAProxy load balancing algorithm and configuration - - 1. Analyze the load balancing algorithm used in the configuration to ensure it is suitable for your setup. - 2. Check for any misconfigurations, such as incorrect server addresses, ports, or weights. - -### Useful resources - -1. [The Four Essential Sections of an HAProxy Configuration](https://www.haproxy.com/blog/the-four-essential-sections-of-an-haproxy-configuration/) -2. [HAProxy Explained in DigitalOcean](https://www.digitalocean.com/community/tutorials/an-introduction-to-haproxy-and-load-balancing-concepts)
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