Runbook

Anomalous number of frontend 4xx HTTP responses for host

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Overview

This incident type involves an anomalous number of frontend 4xx HTTP responses for a particular host. This may indicate a problem with the HAProxy, which is a load balancer often used in web architectures. It can result in service disruptions and should be investigated promptly.

Parameters

Debug

Check the HAProxy configuration file for any errors or typos

Check the log files for any errors or issues

Check the status of the HAProxy service

Check the network connectivity for the affected host

Check the HTTP response code for the affected host

Network or connectivity issues between the HAProxy and backend servers

Repair

Restart the HAProxy service.

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