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Discover how to efficiently iterate over nested dictionaries in Ansible with a comprehensive and clear solution, including examples and detailed explanations.
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This video is based on the question https://stackoverflow.com/q/66315118/ asked by the user 'Daniel Kruk' ( https://stackoverflow.com/u/8785568/ ) and on the answer https://stackoverflow.com/a/66319074/ provided by the user 'Zeitounator' ( https://stackoverflow.com/u/9401096/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Ansible Iteration Over Nested Dictionaries: A Step-by-Step Guide

When working with complex data structures in Ansible, one common challenge is iterating over nested dictionaries. This scenario can arise in automation tasks where multiple levels of data need to be processed. In this guide, we will explore how to effectively iterate over a nested dictionary using Ansible, breaking down a solution step-by-step.

The Problem

Consider the following nested dictionary structure:

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

Your goal is to iterate through this dictionary to produce a series of combinations, formatted as:

d1, t1, p1

d1, t1, p2

d1, t2, p1

d2, t1, p1

The challenge is to capture each of these combinations in a way that can be used later in your Ansible playbook.

The Solution

Step 1: Set Up Your Playbook

To achieve this, we will create an Ansible playbook that will use a combination of loops and the set_fact module to build our desired list.

Here's a simple structure for your playbook:

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

Step 2: Level 1 Product (d* X t*)

The first task you need is to iterate through the top-level keys (d1, d2) and access their nested dictionaries (t1, t2). We will store these combinations in a list called level1.

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Step 3: Level 2 Product (d* X t* X p*)

Next, we need to further iterate through level1, adding the individual products (p1, p2) for each combination of d and t. This will help us generate the final combinations.

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Step 4: Output the Results

Finally, we will display the combinations using the debug module.

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Complete Example Playbook

Putting it all together, your complete playbook will look like this:

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

Conclusion

By following these steps, you can effectively iterate over nested dictionaries in Ansible and generate the combinations you need. This approach can be adapted for various data structures, making your automation scripts more powerful and flexible. Should you have further questions or alternative structures, feel free to explore other solutions or post your queries in the comments!