What you'll learn
- Comparing Versions with Ansible
- Comparing Versions with Ansible
- Benefits of Using Ansible for Version Comparison
- Links
- Demo
- Code
- Execution Ansible 2.14
- Execution Ansible 2.15
- Conclusion
- Basic Version Comparison
The Ansible `version` test (`is version`) compares two version strings inside a `when` conditional using operators such as `>=`, `<`, or `==`. Syntax: `when: my_var is version('2.0', '>=')` — it supports semantic versioning, RPM epoch notation, and a `strict` mode for exact semver parsing.
Comparing Versions with Ansible
Comparing Versions with Ansible
One common task in IT infrastructure management is ensuring that all systems and applications run the same software version. This can be time-consuming and error-prone, especially as the number of systems and applications in your infrastructure grows.
Fortunately, Ansible makes it easy to automate version comparison and ensure consistency across your infrastructure. The code snippet provided above Playbooknstrates how to use Ansible to compare the version of Ansible installed on all hosts with the specified version “2.15”.
This code uses the “ansible.builtin.version” filter to compare the installed version with the specified version and then returns a boolean value indicating whether the installed version is greater than or equal to the specified version. If the installed version is less than “2.15”, the debug message will return “False”, and you can use this information to trigger an update to the latest version of Ansible.
Benefits of Using Ansible for Version Comparison
Using Ansible to automate version comparison and updates has several benefits, including:
- Increased consistency: Automating version comparison and updates ensures that all systems and applications are running the same software version, which can help prevent compatibility issues and reduce the risk of security vulnerabilities.
- Time savings: Automating version comparison and updates can save time by reducing the amount of manual effort required to ensure consistency across your infrastructure.
- Improved accuracy: Automating version comparisons and updates can reduce the risk of errors when performing these tasks manually.
- Scalability: Ansible is designed to be scalable, so you can easily manage version comparison and updates across many systems and applications.
Links
- https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_tests.html#comparing-versions
- https://docs.ansible.com/ansible/latest/collections/ansible/builtin/version_test.html
Demo
This Ansible playbook will compare the version of Ansible installed on all hosts with the specified version “2.15” using the “version” filter and return a boolean value indicating whether the installed version is greater than or equal to the specified version.
If the installed version of Ansible is greater than or equal to “2.15”, the debug message will return “True”. If the installed version is less than “2.15”, the debug message will return “False”.
Note that this playbook will run on all hosts specified in the Ansible inventory. If you only want to run it on a specific host or group of hosts, you will need to modify the “hosts” line accordingly.
Code
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