Ansible Conditionals
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External
- https://docs.ansible.com/ansible/latest/user_guide/playbooks_conditionals.html
- https://docs.ansible.com/ansible/latest/user_guide/playbooks_conditionals.html#loops-and-conditionals
Internal
Overview
Tasks can be conditionally executed based on facts, registered variables or playbook or inventory variables. The conditional is introduced by the task configuration keyword when:
.
The variables must not be enclosed in Template:...
when used in when:
expressions.
- name: Download Amazon Corretto
get_url:
url: https://corretto.aws/downloads/latest/amazon-corretto-11-x64-macos-jdk.pkg
dest: /tmp
when: java_vendor == "Amazon"
- name: Install Nginx
apt:
pkg: nginx
state: installed
update_cache: true
when: ppastable|success
notify:
- Start Nginx
Expressions
Undefined Variables
Use is defined
, is not defined
. Do not attempt to dereference with "{{ ... }}" until it is established the variable is defined:
- name: Test whether a variable is not defined
debug:
msg: "some_var is not defined"
when: some_var is not defined
- name: Test whether a variable is defined
debug:
msg: "some_var is defined"
when: some_var is defined
Logical Operators
Parentheses can be used in expressions.
and
or
not
- name: "info"
when: not java_updated
debug:
msg: "Java was NOT updated"
<
<=
>
>=
==
- name: "info"
when: java.vendor == "Amazon" and java.version == 11
debug:
msg: "Java vendor is Amazon, Java version is 11"