Ansible infrastructure testing to test Kubernetes resources

Infra testing is a urgent piece of programming improvement. It assists with distinguishing issues and guarantee that the code functions as expected. Ansible is a well known instrument utilized for foundation computerization, and it can likewise be utilized for infra testing. In this blog, we'll talk about how Ansible can be utilized to test Kubernetes assets and guarantee that they function as planned.

Prerequisites:

Before we dive into testing Kubernetes resources using Ansible, let’s take a look at the prerequisites for this tutorial.

1. A Kubernetes cluster: You’ll need a running Kubernetes cluster to test your resources.
2. Ansible installed: You’ll need Ansible installed on your local machine to create the playbook for testing.
3. Kubectl installed: You’ll need kubectl installed on your local machine to interact with the Kubernetes cluster.
4. Basic understanding of Ansible: You should have a basic understanding of Ansible and how it works.

Testing Kubernetes resources with Ansible:

Step 1: Create a test playbook

The first step is to create a test playbook. The playbook will test the Kubernetes resources and ensure that they are running as expected. Here’s a sample playbook that tests a Kubernetes deployment:

- name: Test deployment
  hosts: localhost
  gather_facts: no
  vars:
    deployment_name: "my-deployment"
  tasks:
  - name: Get deployment status
    shell: kubectl get deployment {{ deployment_name }} -o=jsonpath='{.status.readyReplicas}'
    register: deployment_status
    failed_when: deployment_status.rc != 0
  - name: Verify deployment is running
    assert:
      that:
        - deployment_status.stdout != 'null'
        - deployment_status.stdout != '0'
      fail_msg: 'Deployment {{ deployment_name }} is not running.'

This playbook uses kubectl to check the status of the deployment and ensure that it’s running. If the deployment is not running, the playbook will fail.

Step 2: Run the test playbook

Once you’ve created the test playbook, you can run it using the following command:

ansible-playbook test-kubernetes.yml

This will run the test playbook and check the status of the deployment.

Step 3: Verify the test results

After running the test playbook, you’ll need to verify the results. If the deployment is running, you’ll see the following output:

TASK [Verify deployment is running] **************************************************
ok: [localhost] => {
    "changed": false,
    "msg": "All assertions passed"
}

If the deployment is not running, you’ll see an error message like this:

TASK [Verify deployment is running] **************************************************
failed: [localhost] (item={'failed': True, 'item': '', 'msg': "Deployment my-deployment is not running.", 'evaluated_to': False}) => {"ansible_loop_var": "item", "changed": false, "item": {"evaluated_to": false, "failed": true, "item": "", "msg": "Deployment my-deployment is not running."}, "msg": "One or more assertions failed"}

Conclusion:

In this blog, we discussed how Ansible can be used to test Kubernetes resources. We covered the prerequisites, created a sample playbook to test a deployment, and ran the playbook to verify the results. Infrastructure testing is an important part of software development, and Ansible provides a powerful tool to automate testing and ensure that code works as intended. With Ansible, you can ensure that your Kubernetes resources are running as expected and catch issues before they become major problems.