Run an Ansible task only when the variable contains a specific string
LinuxConditionalAnsibleAnsible PlaybookAnsible 2.xLinux Problem Overview
I have multiple tasks depend from the value of variable1. I want to check if the value is in {{variable1}} but i got an error:
- name: do something when the value in variable1
command: <command>
when: "'value' in {{variable1}}"
I'm using ansible 2.0.2
Linux Solutions
Solution 1 - Linux
If variable1 is a string, and you are searching for a substring in it, this should work:
when: '"value" in variable1'
if variable1 is an array or dict instead, in will search for the exact string as one of its items.
Solution 2 - Linux
None of the above answers worked for me in ansible 2.3.0.0, but the following does:
when: variable1 | search("value")
In ansible 2.9 this is deprecated in favor of using ~ concatenation for variable replacement:
when: "variable1.find('v=' ~ value) == -1"
http://jinja.pocoo.org/docs/dev/templates/#other-operators
Other options:
when: "inventory_hostname in groups[sync_source]"
Solution 3 - Linux
From Ansible 2.5
when: variable1 is search("value")
Solution 4 - Linux
Some of the answers no longer work as explained.
Currently here is something that works for me in ansible 2.6.x
when: register_var.stdout is search('some_string')
Solution 5 - Linux
This example uses regex_search to perform a substring search.
- name: make conditional variable
command: "file -s /dev/xvdf"
register: fsm_out
- name: makefs
command: touch "/tmp/condition_satisfied"
when: fsm_out.stdout | regex_search(' data')
ansible version: 2.4.3.0
Solution 6 - Linux
This works for me in Ansible 2.9:
variable1 = www.example.com.
variable2 = www.example.org.
when: ".com" in variable1
and for not:
when: not ".com" in variable2
Solution 7 - Linux
use this
>when: "{{ 'value' in variable1}}"
instead of
>when: "'value' in {{variable1}}"
Also for string comparison you can use
>when: "{{ variable1 == 'value' }}"
Solution 8 - Linux
In Ansible version 2.9.2:
If your variable variable1 is declared:
when: "'value' in variable1"
If you registered variable1 then:
when: "'value' in variable1.stdout"
Solution 9 - Linux
I used
failed_when: not(promtool_version.stdout.find('1.5.2') != -1)
means - failed only when the previously registered variable "promtool_version" doesn't contains string '1.5.2'.