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12.08.2019 · In Ansible playbooks, it is often a good practice to test if a variable exists and what is its value. Particularity this helps to avoid different “VARIABLE IS NOT DEFINED” errors in Ansible playbooks. In this context there are several useful tests that you can apply using Jinja2 filters in Ansible.. In this article, i’ll show the examples of how to test a variable in Ansible: if it ...

05.02.2020 · Q: "Check the defined variable is empty or not in Ansible." A: Simply test the variable. An empty list evaluates to False. This also covers the case when the variable is not defined. YAML None is Python null. None also evaluates to False. For example. In the loop, it's not necessary to test whether the list is empty.

Feb 06, 2020 · To check if it is empty you need to give as below. when: not files_list See Default rules here: https://docs.ansible.com/ansible-lint/rules/default_rules.html. It states: Don’t compare to empty string, use when: var rather than when: var != "" (or conversely when: not var rather than when: var == "")

You can check for empty string (when stderr is empty) - name: Check script shell: . { { venv_name }}/bin/activate && myscritp.py args: chdir: " { { home }}" sudo_user: " { { user }}" register: test_myscript - debug: msg='myscritp is Ok' when: test_myscript.stderr == "". If you want to check for fail:

29.07.2017 · Ansible when variable contains string. We can also make a conditional statement based on whether the variable contains a particular string. We can use variable.find for checking the contents. In the following example, the task will …

Applying a null or empty string check to an Ansible register can be accomplished via the following solution: when: <registername>.stdout == "".

How about making when: my_var conditional working in Ansible for string variables? It would be good alternative to empty string comparison.

Check if a variable in Ansible playbook is defined (exists), empty or set to True or False. The 'when' statement and conditions in Ansible.

(ansible 2.9.6 ansible-lint 4.2.0). See ansible-lint default rules. The condition below causes E602 Don't compare to empty string when: ...

note if i replace != by == in the debug task it is skipped.. I failt to understand why? thank you.

Search for a String in a file using Ansible lineinfile module. Lineinfile module is built to validate whether or not a particular line(string) ...

Tests · Test syntax · Testing strings · Vault · Testing truthiness · Comparing versions · Set theory tests · Testing if a list contains a value.

(ansible 2.9.6 ansible-lint 4.2.0) See ansible-lint default rules. The condition below causes E602 Don’t compare to empty string. when: test_myscript.stderr != "" Correct syntax and also "Ansible Galaxy Warning-Free" option is. when: test_myscript.stderr | length > 0 Quoting from source code

Jul 29, 2017 · Ansible when variable is empty. We can also check if a variable is empty using similar manner. - hosts: all tasks: - shell: cat /etc/temp.txt register: output - name: Ansible when variable is empty example debug: msg: "empty" when: output.stdout == ""

Aug 12, 2019 · Check if Ansible variable is defined and not empty: tasks: - shell: echo "The variable 'foo' is defined and not empty" when: (foo is defined) and (foo|length > 0) - fail: msg="The variable 'bar' is not defined or empty" when: (bar is not defined) or (bar|length == 0) Cool Tip: Ansible Playbook – Print Variable & List All Variables! Read more → Check if Ansible variable is True or False:

Dec 21, 2021 · If you want to run another task only on hosts where the stdout of your registered variable is empty, check the registered variable’s string contents for emptiness: - name : check registered variable for emptiness hosts : all tasks : - name : List contents of directory ansible.builtin.command : ls mydir register : contents - name : Check contents for emptiness ansible.builtin.debug : msg : "Directory is empty" when : contents.stdout == ""

So, for Ansible, I use a pipe default to set a default value that I can test for as a string. With lists if I want to confirm they are empty I check if ...

It would appear from the output that a_hosts_ip is a list and not a string so it does not in fact equal the empty string. I would suggest using the conditional when: not a_hosts_ip because that will go through the templating engine and jinja2 will use python truth value testing to evaluate the conditional. This way you can catch both the empty string and empty list scenario as both are ...

Let's say you have a playbook that should only be executed when the "foo" variable is defined and contains a value.

to ansible...@googlegroups.com. If setting it to an empty string when you don't want it to run is okay for your use case, you could do:

11.06.2021 · Ansible - when variable is empty or not empty . by Jeremy Canfield | Updated: June 11th, 2021 | Ansible articles. Let's say you have a playbook that should only be executed when the "foo" variable is defined and contains a value. The length filter is ...