CODEWITHSUNDEEP
jinja2ansible
Mike S.
Mike S.

Reputation: 4879

Pass a variable dynamically into Ansible template while iterating a list in playbook

Ansible gurus I need your help. I have a template with a variable I need to set dynamically while iterating through a list in the playbook. It's not clear how to "inject" a variable to the template to use while iterating.

Objective is to create many config files in a directory, one for each var in a list. For example if the list is A, B, C I would want files A.conf, B.conf, C.conf respectively.

Within the template config file, there is a variable that needs to be set with the A, B, or C respectively as well. I tried to use the set_fact and set variable from the list item and reference. I tried to reference {{ item }} within. All failed?

apps:
 - one
 - two
 - three

tasks:
    - name: Install Logstash config
      template: src={{ upload_dir }}/deploy/logstash-etl.conf dest=/opt/logstash/bin/etl-{{ item }}.conf
      set_fact:
        app: "{{ item }}"
      delegate_to: "{{ logstash_host }}"
      with_items: apps

Within the template file I've tried to reference {{ app }} and {{ item }} and I cannot seem to get it to recognize the dynamic variable to set it's value from the current value of the iteration.

Expected if I had apps: one, two, three would be 3 files in a folder each named etl-one.conf, etl-two.conf, etl-three.conf respectively and within each file a variable in the config dynamically set like "topic_id": "etl.one.Event" for etl-one.conf and "topic_id": "etl.two.Event" for etl-two.conf respectively.

Many thanks for any ideas. The set_fact was my latest attempt and that fails with a 

ERROR: multiple actions specified in task: 'template' and 'Install Logstash config'
exit status 1

Upvotes: 5

Views: 5972

Answers (1)

Mike S.
Mike S.

Reputation: 4879

I got it to work without errors. It appears the template CAN reference the {{ item }} variable as you iterate so you use it within the template. 

- name: Install Logstash config
  template: src={{ upload_dir }}/deploy/logstash-etl.conf dest=/opt/logstash/bin/etl-{{ item }}.conf
  delegate_to: "{{ logstash_host }}"
  with_items: apps

And in template file:

"topic_id": "etl.{{ item }}.Event"

Upvotes: 6

Related Questions