Docker Plugin - if statements dont work properly

Troubleshooting
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1

CMK version:2.0.0
OS version: Debian 11 Bullseye

It seems checkmk cant handle stringfilter if statements. My code:

from .agent_based_api.v1 import *
import socket

def discover_docker_check(section):
    yield Service()

def check_docker_check(section):
    server = str(section).replace("[","").replace(",","").replace("'","").replace("]","")
    if "online" or "is running" in server:
        yield Result(state=State.OK, summary=f"Status: {server}")
    else:
        yield Result(state=State.CRIT, summary=f"Status: {server}")
        return

register.check_plugin(
    name="docker_db_check",
    service_name="Docker DB Check",
    discovery_function=discover_docker_check,
    check_function=check_docker_check,
)

In the check mk monitoring the service is still marked as OK, even if the output of the section is empty (i already checked with the f strings integrated after i shut down the docker container - there should be no “is running” or “online” in the section, sadly the filter still doesnt work). Why does check mk ignore if statements with any logic outside of “= 0”? this really makes it hard to design any custom plugin

2

CMK is not ignoring the if statement. All valid Python programming is possible inside your check function.
What you should do is - add some debug output to see what CMK has inside the “server” variable at execution time. Then you should execute it on command line with “cmk --debug -vvn hostname” to see what happens.

For check development i would recommend a runtime environment like this

or my modified version

These dev environments have nice options for debugging with break points and so on.

3

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