ansible/examples/playbooks/upgraded_vars.yml

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# in Ansible 1.2 and later, the $foo variable syntax, which is friendly enough for simple things
# has been upgraded to allow Jinja2 substitiutions as well, which is now the preferred Syntax.
# here is an example. Note that Jinja2 conditionals belong only in templates. Use ansible conditionals
# in playbooks.
---
- hosts: all
vars:
a_list:
- a
- b
- c
tasks:
- shell: echo hello {{ ansible_hostname.upper() }}
- shell: echo match
when: 2 == 2
- shell: echo no match
when: 2 == 2 + 1
- shell: echo {{ ansible_os_family }}
- shell: echo {{ item }}
with_items: a_list
- shell: echo 'RedHat'
when: ansible_os_family == 'RedHat'