Скачать или смотреть How to Iterate a Dictionary in Ansible to Generate Combinations of Key-Value Pairs

Learn how to effectively iterate through a dictionary in Ansible to produce combinations of keys and their multiple values with a comprehensive solution.
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Iterate a Dictionary in Ansible: Generating Combinations of Key-Value Pairs

In the world of automation with Ansible, you often encounter tasks that require you to iterate through complex data structures like dictionaries. Let's consider a practical example: You have a dictionary where each key represents a person's name, and the values are lists of fruits they like. The goal is to generate statements such as "Alice eats Avocado" for each combination of person and their favorite fruits. If you've tried to accomplish this in Ansible and hit a wall, you’re in the right place!

Understanding the Problem

Given the following dictionary structure, where each person has a list of preferred fruits:

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You want to output phrases indicating which person eats which fruit, such as:

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The Ansible Approach

Step 1: Flatten the Dictionary

The first step involves restructuring your dictionary into a more manageable format. Specifically, you want a flat list of tuples in the format (person, food). This can be achieved using the product filter in Ansible, which helps compute the Cartesian product of two lists.

Step 2: Set Fact for Combination Creation

We will loop through our dictionary using the set_fact module to create this list of combinations. Using the following approach, we can iterate over each (key, values) tuple in the dictionary and append the results to a new list—cross:

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In this code:

cross is initially an empty list.

For each item, we compute the cross product of the key (name of the person) and their preferred fruits (values).

Step 3: Final Debug Output

Finally, we need to utilize the generated combinations to output our desired phrases. This can be done using the debug module like so:

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Full Playbook Example

Combining everything, here’s how the complete playbook looks:

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Expected Output

When you run this playbook, you should see output similar to:

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Each possible combination of names and their fruits will be displayed, providing a clear representation of what each person eats.

Conclusion

By following the structured approach outlined in this guide, you can efficiently iterate over dictionaries in Ansible and create output based on combinations of key-value pairs. The product filter, combined with set_fact, allows for flexible and scalable data manipulation within your playbooks. Feel free to adapt this method to fit your needs!

Now you're all set to generate dynamic, data-driven outputs in your Ansible automation tasks!