How to get Check Conditions into Check

Checkmk Exchange
#1

Hello together,
im developing a check and need some help maybe :slight_smile:

The Parameters are developed like this:

def _parameter_valuespec_mycheck_subsystem():
    return Dictionary(
        elements=[
            ("levels_percent", Tuple(
                title=_("Levels on Subsystem"),
                elements=[
                    Percentage(title=_("Warning at"), default_value=80),
                    Percentage(title=_("Critical at"), default_value=90)
                ],
            )),
        ],
    )

I can get this values when i define my check with the params option:


def check_mycheck_subsystem(item, params, section):

But how can i get the Conditions into my check?

My Condition of the Check in WATO is this:

def _item_valuespec_mycheck_subsystem():
    return TextAscii(title=_("Subsystem Service Checks"))

But how can i get the Values from this Item into my check?
The params definition does only include my values but not the Conditions.

image
image1243Ă—432 16.9 KB

Maybe someone can help me with this.

Best regards :slight_smile:

#2

Hi,
I think you miss some things in your checks.

  1. You need to define the group name for the parameters set used by valuesspecs and checks:
    web/plugins/wato:
rulespec_registry.register(
    CheckParameterRulespecWithItem(
        check_group_name="mycheck",
        group=RulespecGroupCheckParametersApplications,
        item_spec=lambda: TextAscii(title=_("Service name"),
                        help=_("The identifier of the service.")),
        title=lambda: _("Mycheck"),
        match_type="dict",
        parameter_valuespec=_parameter_valuespec_mycheck,
    ))

Here you can see how the item_pec is defined. You can also set your function there.
agent_based:

register.check_plugin(
    name = "mycheck",
    service_name = "Mycheck",
    discovery_function = discover_mycheck,
    check_function = check_mycheck,
    check_default_parameters = mycheck_default_levels,
    check_ruleset_name="mycheck"
)

check_ruleset_name and group_name musst be equal.

I hope it helps.
Best regards,
Christian

#3

Thank you @ChristianM

i guess i missunderstood something in General how Conditions work :smiley:

My follow Up question now is, how can i get Check Values into my special Agent?

I have a “ListOfStrings” in my WATO Check Settings from a specific Check.

...
...
...
("subsystemchecks", ListOfStrings (title=_("Subsystem: Check the Following Services:"), allow_empty=True)),
        ],
    )
    


rulespec_registry.register(
    CheckParameterRulespecWithoutItem(
        check_group_name="licenses",
        group=RulespecGroupCheckParametersOperatingSystem,
        match_type="dict",
        parameter_valuespec=_parameter_valuespec_licenses,
        title=lambda: _("Levels for License Expiry Check"),
    ))

How can i get the params from the ListofStrings Configured here into my Special Agent, so i can tell my Agent wich Licenses the Agent should get from the System?

#4

Hi Matthias

This is done with what I call “agent checks”.
You will have to create a file in the folder local/share/check_mk/checks that should be called agent_<something> where <something> identifies your agent.

There are numerous “agent checks” present that you may use as inspiration. You will find them named share/check_mk/checks/agent_*.

These files register the agent in the special_agent_info dict and parse a command line that should be called when executing the agent.

You have to make sure, the dict-key in special_agent_info matches the name you gave the agent in your parameter specification. For instance, if you registered the agent-spec as name="special_agents:luck_generator you will have to use luck_generator as key for special_agent_info: special_agent_info["luck_generator"] = agent_luck_generator_arguments

Template that I use with cmk 2.0 
#!/usr/bin/env python3

from cmk.base.config import special_agent_info, SpecialAgentConfiguration
from cmk.base.check_api import passwordstore_get_cmdline


def agent_something_arguments(params, hostname, ipaddress):
    checks = " ".join(params["checks"]) if "checks" in params else "all"

    args = [
        elem
        for chunk in (("--username", params["username"]),
                      ("--password",
                       passwordstore_get_cmdline("%s", params["password"])),
                      ("--host", ipaddress), ("--checks", checks),
                      ("--timeout", params.get("timeout", 10)))
        for elem in chunk
    ]

    return SpecialAgentConfiguration(args, None)

    # Call cmk.utils.password_store.replace_passwords() in datasource program


special_agent_info['something'] = agent_something_arguments

Happy coding :slight_smile:

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