The issue is that only a single process can be bound to an IP address and port combination at any given time. In the first case, when there is another process that is already using an interface and port that HAProxy is attempting to bind to, the underlying error on Linux is EADDRINUSE. Both error conditions derive from the underlying operating system’s network stack. IntroductionĪn HAProxy cannot bind socket error message is generated when there is another process listening on the same interface and TCP port combination that HAProxy is configured to use, or when HAProxy attempts to use an IP address that is not assigned to a network interface. Subsequent tutorials examine specific errors in detail. The series begins with an overview of the commands and log files that you can use to troubleshoot HAProxy. This tutorial series explains how to troubleshoot and fix some of the most common errors that you may encounter when using the HAProxy TCP and HTTP proxy server.Įach tutorial in this series includes descriptions of common HAProxy configuration, network, filesystem, or permission errors.
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