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As this is a virtual machine, you can adjust these values anytime.

Configuration of Fetcher/Checker settings

Hands-On 

Required services to monitor

To configure the right resources, we recommend checking the following graphs:

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Adjust the helper settings

If you decide to adjust the helper settings, please be aware of these settings:

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• Maximum concurrent Checkmk fetchers

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  • With increasing the number of fetchers, your RAM usage will rise, so make sure to adjust this setting carefully and keep an eye on the memory consumption of your server.
  • The usage should stay under 80% on average.
    
    

• Maximum concurrent Checkmk checkers

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  • The number of checkers should not be higher than your CPU core count! If you have more than two cores, the rule of thumb is: Maximum checkers = number of cores - 1 .
  • The usage should stay under 80% on average.
    
    
• Maximum concurrent Livestatus connections
  
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  • In a distributed monitoring setup, having different values for the remote sites may be helpful. You will find the guidance on how to do that here!

Check the Livestatus Performance

If you face issues like this:

Please see this manual to check the Livestatus Performance

Required log files

Please see this manual to enable debug log of the helpers. The required settings are:

• Core
• Debugging of Checkmk helpers

High Fetcher Usage Although the fetcher helper count is already high

If you face the following problems: 

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• Firewalls are dropping traffic from Checkmk to the monitored systems. If the packets are dropped rather than blocked, Checkmk must wait for a timeout instead of instantly terminating the fetching process.
  
  
• You might have too many DOWN hosts, which are still being checked. Checkmk still tries to query those hosts, and the fetchers need to wait for a timeout every time. This can bind a lot of fetcher helpers, which are blocked for that time. Remove hosts which are in a DOWN state from your monitoring. Either permanently or by setting their Criticality to "Do not monitor this host".
  
  
• For classical operating systems (Linux/Windows/etc.), this indicates that you might have plugins/local checks with quite a long runtime. Increasing the number of fetchers further here is not constructive. Instead, you must identify the long-running plugins/local checks and set them to asynchronous execution and/or define (generous) cache settings or even timeouts, especially for them.
  
  
• For SNMP devices, you might have poorly performing SNMP devices. To troubleshoot those, have a look at this blog post.
  

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