ansible/examples/playbooks/conditionals_part3.yml

48 lines
1.6 KiB
YAML
Raw Normal View History

---
# this is a demo of conditional executions using 'only_if', which can skip
# certain tasks on machines/platforms/etc where they do not apply. This is
# the more 'raw' version of the 'when' statement, most users will be able to
# use 'when' directly. 'only_if' is an older feature, and useful for when
# you need more advanced expression control.
- hosts: all
user: root
vars:
favcolor: "red"
ssn: 8675309
# Below we're going to define some expressions.
#
# Not only can we assign variables for reuse, but we can also assign conditional
# expressions. By keeping these in 'vars', the task section remains
# extraordinarily clean, and not littered with programming language
# constructs -- so it's easily skimmed by humans.
#
# Remember to quote any variables if they are not numbers!
#
# Interesting fact: aside from the $variables, these expressions are actually
# tiny bits of Python. They are evaluated in the context of each host, so different
# steps can be skipped on different hosts! They should evaluate to either True
# or False
is_favcolor_blue: "'$favcolor' == 'blue'"
is_centos: "'$facter_operatingsystem' == 'CentOS'"
# NOTE:
#
# setup module values, facter and ohai variables can be used in only_if statements too
# ex: "'$facter_operatingsystem' == 'CentOS'", which bubble up automatically
# from the managed machines. This example doesn't do that though.
tasks:
- name: "do this if my favcolor is blue"
action: shell /bin/false
only_if: '$is_favcolor_blue'
- name: "do this if my favcolor is not blue"
action: shell /bin/true
only_if: 'not ($is_favcolor_blue)'