Скачать или смотреть How to Modify the Value of a Key in a List of Dictionaries Using Ansible

Learn how to effectively modify values in a list of dictionaries using Ansible. This guide will help you understand and implement changes to your data with practical examples.
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This video is based on the question https://stackoverflow.com/q/76133558/ asked by the user 'Wanderer' ( https://stackoverflow.com/u/2062086/ ) and on the answer https://stackoverflow.com/a/76136254/ provided by the user 'Kevin C' ( https://stackoverflow.com/u/4834431/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Modify the Value of a Key in a List of Dictionaries Using Ansible

Working with data structures in Ansible can sometimes be challenging, especially when it comes to modifying values within lists of dictionaries. If you're looking to modify values effectively in an Ansible playbook, you’ve come to the right place. In this guide, we will dive into a practical example where we modify a list of dictionaries, ensuring the end result matches our expectations without any flyaway issues.

The Problem

You might have a scenario where you have a list of dictionaries, and you need to manipulate the values of specific keys. For instance, suppose you have the following list of dictionaries:

[[See Video to Reveal this Text or Code Snippet]]

Now, you want to achieve a new structure where each foo key contains additional text, and a new dictionary is properly added without disrupting the original format. The target output should look like this:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

To achieve this modification, we will utilize Ansible's set_fact in conjunction with a loop to iterate over each item in the list. Here’s how to implement it step-by-step.

Step 1: Define Your Variables

Start with the initial structure of your Ansible playbook, where you define the alist that you want to modify. You should also initialize an empty list, new_alist, to hold the modified dictionaries.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Update the Dictionaries

Now, use the set_fact module to iterate over each dictionary in alist and apply the modification. In this case, we want to append "a new line" to the existing value of foo.

Here’s the task that will do this for us:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Output the Results

Finally, print the newly modified list to verify that everything is going as planned.

[[See Video to Reveal this Text or Code Snippet]]

Final Output

After running this playbook, you'll receive the following output:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Using Ansible to modify a list of dictionaries can be accomplished efficiently with the correct use of loops and facts. By combining these elements effectively, you can ensure your playbooks are functional and optimally manage your data structures.

So next time you face a similar problem, remember this structured approach to modifying your Ansible data effectively!