getting Asible.errors.AnsibleUndefinedVariable: 'broker' is undefined despite assigning in inventory file

[Sameer Modak]

Hello Team,

I am putting broker: true and zookeeper: true  in inventory file but i still getting below exception as its referred in j2 file

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ansible.errors.AnsibleUndefinedVariable: 'broker' is undefined. 'broker' is undefined

fatal: [en1qa1-zookpr02.qa]: FAILED! => {"changed": false, "msg": "AnsibleUndefinedVariable: 'broker' is undefined. 'broker' is undefined"}

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ansible.errors.AnsibleUndefinedVariable: 'broker' is undefined. 'broker' is undefined

fatal: [en1qa1-zookpr01.qa: FAILED! => {"changed": false, "msg": "AnsibleUndefinedVariable: 'broker' is undefined. 'broker' is undefined"}

=================

jinja 2 file

{% if hostvars[inventory_hostname].zookeeper is defined %}

// jmx exporter scrape config for zookeeper

prometheus.scrape "jmx_exporter_zookeeper" {

  targets = [

    {"__address__" = "{{ v_kafka_host }}:{{ v_jmx_exporter_zookeeper_port }}"},

  ]

  scrape_interval = "{{ v_jmx_exporter_scrape_interval }}"

  forward_to = [prometheus.remote_write.mimir.receiver]

}

{% else %}

{% endif %}

{% if hostvars[inventory_hostname].broker is defined %}

// jmx exporter scrape config for Broker

prometheus.scrape "jmx_exporter_broker" {

  targets = [

    {"__address__" = "{{ v_kafka_host }}:{{ v_jmx_exporter_broker_port }}"},

  ]

  scrape_interval = "{{ v_jmx_exporter_scrape_interval }}"

  scrape_timeout = "{{ v_jmx_broker_scrape_timeout }}"

  forward_to = [prometheus.remote_write.mimir.receiver]

}

{% else %}

{% endif %}

=======

kafka_inventory.yaml Inventory  file 

  qa_kafka:

      children:

        cc:

          children:

            qa_eng_kafka_cluster:

               hosts:

                 en1qa1-zookpr[01:03].qa:

                   zookeeper: true

                 en1qa1-kafka[01:06].qa:

                   broker: true

                 en1qa1-kafka[04:06].qa:

                   schema_registry: true

        uc:

          children:

=====================

running as below 

ansible-playbook  -i ansible/inventory/nonprod/kafka_inventory.yaml --limit qa_eng_kafka_cluster ansible/grafana-agent-play.yaml -u Kafka -b  -k

[Todd Lewis]

The messages are correct. You have only defined the "broker" variable on one set of hosts, and the two hosts indicated in the errors are not in that set.

You can fix this in a couple of ways. One way is to define all three variables in all three sets of hosts:

qa_eng_kafka_cluster:
   hosts:
     en1qa1-zookpr[01:03].qa:
       broker: false
       schema_registry: false
       zookeeper: true
     en1qa1-kafka[01:06].qa:
       broker: true
       schema_registry: false
       zookeeper: false
     en1qa1-kafka[04:06].qa:
       broker: false
       schema_registry: true
       zookeeper: false

The other way is to define all three variables in a higher group, setting them all to false, say, and then at the host level set only the ones you want to be true to true:

qa_kafka:
  vars:
    broker: false
    schema_registry: false
    zookeeper: false
  children:
    cc:
      children:
        qa_eng_kafka_cluster:
           hosts:
             en1qa1-zookpr[01:03].qa:
               zookeeper: true
             en1qa1-kafka[01:06].qa:
               broker: true
             en1qa1-kafka[04:06].qa:
               schema_registry: true

To verify the variables are being set and associated with hosts appropriately, you can run:

$ ansible-inventory -i kafka_inventory.yaml --list

Cheers,
—
Todd

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-- 
Todd

[Todd Lewis]

There is yet another way to approach this that I like better than adding variables to hosts in your inventory. It looks like this:

qa_kafka:
  children:
    cc:
      children:
        qa_eng_kafka_cluster:
          children:
            qa_eng_zoo:
              hosts:
                en1qa1-zookpr[01:03].qa
            qa_eng_bro:
              hosts:
                en1qa1-kafka[01:06].qa
            qa_eng_sch:
              hosts:
                en1qa1-kafka[04:06].qa

This creates three additional host groups: qa_eng_zoo, qa_eng_bro, and qa_end_sch. In your templates and whatnot, you can simply check for group membership.

Cheers,
—
Todd

-- 
Todd