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If Condition In Ansible Jinja2 Template

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I have an ansible jinja which is making use of variable { { mydata }} the value of this variable differs for each host available in the inventory. I am trying to use if condition in my vars to set i

【Ansible】if文で条件分岐させる

Learn how to use Ansible conditionals to improve automation workflows. This guide covers „when“ statements, multiple conditions, Ansible facts, registered variables, and Jinja2 templates for more flexible and efficient playbooks. Ansible uses Jinja2 as a template engine. Hence, it would be useful for us to understand Jinja2 control structures in addition to the ones supported by Ansible tasks. Jinja2’s syntax encloses the control structures inside the {% %} blocks. For conditional control, Jinja2 uses the familiar if statements, which have the following syntax: 参考 {%- -%} はjinja2というpythonのWeb開発でよく使用されるテンプレートエンジンです。 Ansibleではjinja2が使用できるため上記のような記述ができる訳です。 参考 実行例 上記の例の playbook.yml を実行すると次のような結果となります。

Jinja2 Template Ansible

In Jinja2 templates, it is often a good practice to test if a variable exists and what value does it carry. There are several useful tests that you can make using Jinja2 builtin tests and filers. In this article, i’ll show how to test if a variable exists or not, if it is empty or not and if it is set to True. I’ll also give two examples of how to combine these checks. Check Variable in The template looks like this: solr.replication.master= {% if ansible_eth0.ipv4.address == servermaster.eth0 %} false {% else %} true {% endif %} solr.replication.slave=false And the output should look like this: solr.replication.master=true solr.replication.slave=false What I am actually getting is: solr.replication.master=truesolr.replication.slave=false I understand that Jinja2 strips

ansible – example of template if else. GitHub Gist: instantly share code, notes, and snippets.

From the Jinja2 template designer documentation: {% if variable is defined %} value of variable: {{ variable }} {% else %} variable is not defined {% endif %} Jinja2 is a very popular and powerful Python-based template engine. Jinja2 templates is widely used in Ansible playbook to access variables, configuration etc

Jinja2 in Ansible templates allows this type of expression in templates: {% if foobar is defined %} foo_bar = {{foobar}} {% endif %} {% if barfoo is defined %} bar_foo = {{barfoo}} {% endif %} etc. Is there any shorter version to say ‚do not print this line if its variable is not defined? Something like foo_bar = { {foobar|skip_this_line_if_undefined}}?

I have a long Jinja2 template which has many nested if/for statements. It’s very hard to read. I would like to indent the {% %} bits, to make it clearer. However if I do that, the contents of those 1. What is Jinja2? Jinja2 is a templating engine for Python, and it is used in Ansible to render templates dynamically based on variables, facts, or conditions. It allows you to create text-based configurations (e.g., configuration files, scripts) that change based on the input data, providing flexibility and automation. Jinja2 uses curly braces ({{ }}) to denote expressions ansible jinja2 ansible-template edited Dec 1, 2017 at 0:17 techraf 69.1k 30 209 215

  • Mastering loops with Jinja templates in Ansible
  • How to Use Jinja2 Templates in Ansible
  • Conditional control structure in Jinja2 templates

This is a snippet from my Ansible jinja template which populates an environment specific template. docker_compose_mq: <string-passed from Jenkins> docker_compose_profiles: „string“ {% if „{{ In configuration management and automation, templates play a very important role. They allow you to create dynamic, reusable file content by using variables and other expressions in text files. In the context of Ansible, the template engine of choice is Jinja2. You will create mostly configuration templates in Jinja2 format, and address them in your

Templating (Jinja2) ¶ As already referenced in the variables section, Ansible uses Jinja2 templating to enable dynamic expressions and access to variables. Ansible greatly expands the number of filters and tests available, as well as adding a new plugin type: lookups. Jinja templates in Ansible can be very powerful. They can also be a leading contributor to hair loss. Why? In some ways it comes down to documentation, a mixing of languages (YAML, Python, Jinja2), and variables. During a recent consulting project with a customer, focused on network automation, we embarked on a journey to re-evaluate how

This is easy to do in Ansible with the when clause, which contains a raw Jinja2 expression without double curly braces (see group_by – Create Ansible groups based on facts). It’s actually pretty simple: I’m using Ansible with Jinja2 templates, and this is a scenario that I can’t find a solution for in Ansible’s documentation or googling around for Jinja2 examples. Here’s the logic that I want to a

Ansible is not meant to treat If-Else-Statements. As you mentioned in the bottom of your question, with jinja2 templates it would be easier, but it would not just be easier, but it would make it the correct way to do it. So instead of trying to mess up your yaml file with if-else statements, create a single jinja2 file with the required template parameters (looks like you ansible jinja2 ansible-template edited Feb 7, 2017 at 1:01 techraf 69k 30 209 215 The second task will be executed if ‘item4’ is present in the my_list variable or the value of my_dict.key1 is ‘value1’. Note that you can use any valid Jinja2 expression in the when condition to check for complex conditions involving lists, dictionaries, and other variables in

My idea was to get the dynamic value of ansible_hostname that is provided via Ansible facts. When I try with {% if x in ansible_hostname %} without ansible_hostname being defined in vars.yaml, it does not work. Still trying to understand the way to work jinja2 templates I’m looking for a way to alter the definition of a gateway address based on the name of the current inventory_hostname. eth0gateway and eth0gateway_gen are variables in the playbook. I would like to branch depending on if ecd0 is in, or starts with, the inventory_hostname. Can someone lead me in 2 You probably should remove the indentation in the template conditions, the spaces before the conditions are added to the spaces of the next line, because the new-line after the condition tag is being removed, which causes the anotations mapping to be double indented which is not expected. Your current template results is: metadata

Jinja2 template variable if None Object set a default value Asked 11 years, 10 months ago Modified 1 month ago Viewed 449k times 概要 Ansibleのplaybookの中でjinja2の記法をつかって条件分岐させてみたいと思います。 playbook例 prodがhonならhonban、kaiならkaihatsuと出力するように設定しています。 You can use the Ansible-specific filters documented here to manipulate your data, or use any of the standard filters shipped with Jinja2 – see the list of built-in filters in the official Jinja2 template documentation. You can also use Python methods to transform data.

Jinja’s Template Designer Documentation explains how to create and use templates with special placeholders, macros, and inheritance for dynamic content rendering.

Basic conditionals with when ¶ The simplest conditional statement applies to a single task. Create the task, then add a when statement that applies a test. The when clause is a raw Jinja2 expression without double curly braces (see group_by_module). When you run the task or playbook, Ansible evaluates the test for all hosts. On any host where the test passes

Dans ce guide, je vais vous exposer l’utilisation de Jinja avec Ansible pour construire des fichiers de configurations dynamiques. Comme vu dans mon cours sur Python, Jinja est un moteur de template puissant qui permet de manipuler des variables, d’utiliser des boucles et des conditions. En plus de sa capacité à générer des fichiers de configuration, Jinja Learn how to write multiline Jinja statements effectively with examples and tips on Stack Overflow.