[icinga-users] Using check_multi with Icinga2

Gunnar Beutner Gunnar.Beutner at netways.de
Sat Aug 13 08:16:48 CEST 2016


How about something like this?:

object Host "ec2-instance1" {
  import "generic-host"

  address = "192.168.2.36"

  vars.elbs = [ "elb1", "elb2" ]
}

object Host "ec2-instance2" {
  import "generic-host"

  address = "192.168.2.36"

  vars.elbs = [ "elb1", "elb2" ]
}

var ELBs = [
  "elb1",
  "elb2"
]

for (elb in ELBs) {
  object Host elb {
    import "generic-host"
  }

  object Service "cluster" use(elb) {
    import "generic-service"

    host_name = elb
    check_command = "dummy"

    vars.ec2_instances = []
    for (host in get_objects(Host)) {
      if (elb in host.vars.elbs) {
        vars.ec2_instances.add(host.name)
      }
    }

    vars.cluster_data = {{
      var states = []
      for (instance in macro("$ec2_instances$")) {
        states.add(get_host(instance).state)
      }
      return states.join(",")
    }}

    vars.cluster_state = {{
      var worst_state = 0
      for (instance in macro("$ec2_instances$")) {
        var state = get_host(instance).state
        if (state > worst_state) {
          worst_state = state
        }
      }
      return worst_state
    }}

    vars.cluster_info = {{
      var worst_state = macro("$cluster_state$")
      var instances = []
      for (instance in macro("$ec2_instances$")) {
        if (get_host(instance).state == worst_state) {
          instances.add(instance)
        }
      }
      var states = [ "OK", "Warning", "Critical", "Unknown" ]
      return "Instances " + instances.join(", ") + " are in state " + states[worst_state]
    }}

    vars.dummy_state = "$cluster_state$"
    vars.dummy_text = "$cluster_info$"
  }
}

This automatically figures out which instances belongs to each ELB by iterating over all hosts and checking their ‚elbs’ custom variable. I’ve also added a few additional custom variables (cluster_state, cluster_info) which demonstrate how you can use use check_dummy to generate your own check results – without using another external plugin.

-----Original Message-----
From: icinga-users <icinga-users-bounces at lists.icinga.org> on behalf of Michael Martinez <mwtzzz at gmail.com>
Reply-To: "icinga-users at lists.icinga.org" <icinga-users at lists.icinga.org>
Date: Friday 12 August 2016 at 23:15
To: "icinga-users at lists.icinga.org" <icinga-users at lists.icinga.org>
Subject: Re: [icinga-users] Using check_multi with Icinga2

    On Fri, Aug 12, 2016 at 12:32 PM, Gunnar Beutner
    <Gunnar.Beutner at netways.de> wrote:
    > You’re going to have to move the attribute declaration _into_ the apply rule:
    Hmmm..
    Let me explain what I need to do, and maybe the folks here can help
    suggest how to achieve it;

    Outside of Icinga, I gather a list of amazon instances and the ELBs
    that they are attached to. I am using Jinja templates to produce the
    Icinga host objects from this list. In order to associate each ELB to
    which hosts belong to it, I have done two things:

    a) in each host object, have a vars._elb variable that contains the
    names of the ELBs the host belongs to
    b) outside of the host objects, created a "global" elb["elbname"]
    array that contains the hostnames of the hosts that belong to it

    Now, I need to create a Service object (for each ELB) that contains a
    vars.cluster_data variable which contains the hosts in the ELB, as
    follows:
    vars.cluster_data = {{ get_host("hostname1").state + "," +
    get_host("hostname2").state + "," + ....
    }}

    I was trying to do this by referencing the "global" elb array as I
    mentioned, but apparently this global data is not available within the
    Service definition.

    What woudl be the right approach?

    Perhaps instead of creating an ELB array, I should create a hostgroup
    for each ELB, and put the ELB's members as members of the hostgroup.
    Then I can reference them in my Service definition?
    --
    ---
    Michael Martinez
    http://www.michael--martinez.com
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Gunnar Beutner
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