Does Ansible Jinja2 Templating support list arguments in for loop?

Question

I'm trying to dynamically create a template from a list and I'm wondering if Ansible supports something like

{% for server in [sg-bend1, sg-bend2] %}
check program {{ server }}_test
  with path /home/ubuntu/t.sh {{ server }}
  if status != 0 then alert
{% endfor %}

theoretically this should produce

check program sg-bend1_test
  with path /home/ubuntu/t.sh sg-bend1
  if status != 0 then alert

check program sg-bend2_test
  with path /home/ubuntu/t.sh sg-bend2
  if status != 0 then alert

Answer 1

According the provided description I understand your question is related to Jinja2 Templating and syntax only.

One approach you could try is the following

{% for i in range(1,3) %}
check program sg-bend{{ i }}_test
  with path /home/ubuntu/t.sh sg-bend{{ i }}
  if status != 0 then alert
{% endfor %}

Similar Q&A

• How to make a for loop in Jinja?
• ... table with Jinja2 and Python
• How can I test Jinja2 templates in Ansible?

Documentation

• Jinja2 Template Designer Documentation - List of Control Structures

As far as I understand the documentation the solution should be to provide the list in a variable

{% for SERVER in SERVERS %}`

or an other syntax

{% for SERVER in ('test1', 'test2') %}

Example

---
- hosts: localhost
  become: false
  gather_facts: false

  vars:

    SERVERS: ['test1', 'test2']

  tasks:

  - name: Show result
    debug:
      msg: "{% for SERVER in SERVERS %}{{ SERVER }}{% endfor %}"

  - name: Show result
    debug:
      msg: "{% for SERVER in ('test1', 'test2') %}{{ SERVER }}{% endfor %}"

will result into an output of

TASK [Show result] ******
ok: [localhost] =>
  msg: test1test2

TASK [Show result] ******
ok: [localhost] =>
  msg: test1test2