CheckMK Check_mk Service

[Gustavo]

CMK version: 2.0
OS version: Centos 7

Hi,

I would like to disable this option for the check mk service

This is not the Ping check i don’t use that configuration, but for some reason is taking the lost on my erratic network, does anyone know how can i disable this?

Thank you.

[Heavy]

If I understood your question correctly, you do not want the check to go into a WARN state when the packet loss is 80%?

This can be achieved by setting the WARN threshold to a higher value, e.g. 90%, while keeping the number of packets on the default value of 5.

[Gustavo]

Hi,

In my case the host is alerting as Down:

with a 80% of lost, but on the view of the checks, everything is ok only for the name:

And when i click on the name, i can see that configuration:

I dont want the alert for the lost of 80% or the RTA, im just want to check if the server is UP or Down, but i dont know were i can modify this threshold

[Heavy]

For some strange reasons, your ping latency is mostly around 2s and the packet loss at 80%, while the Check_MK agent query takes just 0.7s. This could be a firewall or routing issue. The best solution is to find and solve those issues.

Otherwise, you could try several options of the “host check command” ruleset:

• Set the host check command to the status of the Checkmk agent, so host-ping check is not used at all. This is only recommended if the agent query time is constantly low.
• Configure an active PING check for the host, set the round trip time reasonably high (min. 3s) and packet loss rate to at least 90%. Set the host check command to the PING service. Try to slightly increase the thresholds if this does not help.
• Set the host check command to “TCP connect” and connect to a port number that is usually opened (e.g. 80 or 22). Do not use the Checkmk agent port 6556!
• Write a custom script that checks the host by another method; I use the arping Linux command in some cases.
• If all those hints do not help, the last option is to set the host check command to “Always assume the host to be up”. Note that the host state will always stay green in this configuration, and you need to carefully check the state and age(!) of the services. I use this only for hosts which are entirely stealth.

[Gustavo]

@Heavy

host check command

Thank you very much @Heavy for the information. i can resolved my issue.