First there is no requirement difference between the virtual and hardware appliance.
The needed resource are based on the amount of services, active checks and types of hosts. If you have a lot of snmp hosts you will need more cpu cores for executing the walk.
The one and only overview we have is as you already found this page: https://checkmk.com/product/appliances
We always recommend customers to orientate on the specifications for the HW Appliance.
When importing the virtual appliance, we have some default values preconfigured. Please check out this page: https://docs.checkmk.com/latest/en/introduction_virt1.html#_import_the_appliance
As this is a virtual machine, you can adjust these values at any time.
Required services to monitor
To configure the right resources, we recommend checking the following graphs:
- OMD <SITENAME> Performance
- activate the "Core statistics" snapin
Let's give you some example:
With this snapin you will be able to check the load of the fetcher and helper. At 70% we recommend increasing these values in the global settings. While you're increasing these values the CPU load and Memory consumption will grow.
That's why also recommend checking these graphs:
You will find here more information about the fetcher and checker architecture:
One information about the Checker: The checkers shouldn't be higher that your cpu cores!
Adjust the helper settings
In any case you need to adjust the helper settings, please be aware of these setting:
Setup → General → Global Settings → Monitoring Core →
- Maximum concurrent active checks
- increase the helper for the active checks
- Maximum concurrent Checkmk fetchers
- increase the helper for the Checkmk fetchers
- Maximum concurrent Checkmk checkers
- increase the helper for the Checkmk checkers
In a distributed monitoring setup it may be useful to have different values for the remote sites. You will find the guidance on how to do that here!
Required log files
Please see this manual to enable debug log of the helpers. The required settings are:
- Debugging of Checkmk helpers