Site not accessible after update on Checkmk appliance

Owned by Robin Gierse
Last updated: Oct 25, 2024 by Matthew Hierholzer

This article explains how to debug a site if it is not accessible after a Checkmk Appliance update or a Checkmk update.

LAST TESTED ON CHECKMK 2.3.0P1

Table of Contents

Problem

Your Checkmk site is not accessible anymore after you updated your appliance firmware, or Checkmk, or a simple reboot.

You are getting a 404 Apache error like the following:

Reason

The root of these issues lies in outdated appliance firmware.

All relevant background information can be found in Werk 14281.

We have seen this issue also on current firmware occasionally. We are investigating this, but the first two steps of the solution below might still work for you.

Solution

The solution is rather simple and outlined in the aforementioned Werk:

  1. Log into your appliance as root.

  2. For each site that resides on the appliance, run the following: 

    OMD[mysite]~# omd update-apache-config $SITE

    .

  3. You should be back online now, but the next step is necessary for a permanent fix.

  4. As soon as possible, upgrade to an up-to-date firmware version.