Скачать или смотреть How to Run a Different Docker Image in GitLab CI for Performance Tests

Learn how to configure your GitLab CI pipeline to utilize a separate Docker image for performance testing in a subdirectory. Get step-by-step guidance to avoid common pitfalls!
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Running Performance Tests in a Different Docker Image in GitLab CI

In the world of continuous integration and delivery, robust testing is crucial. Sometimes, you may have specialized requirements for certain tests. For instance, you might want to run performance tests in your GitLab pipeline using a different Docker image than the one planned for other stages. This problem often leads to confusion, especially when your performance testing tools aren’t available in the default Docker image.

In this guide, we will explore how to effectively address this issue in your GitLab CI configuration.

Understanding the Problem

If you have a project structured like this:

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

You might define a performance test stage in your .gitlab-ci.yml file like so:

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

However, if bzt (your performance testing tool) is not installed in the default image specified (in this case, my_main_image), the task will fail when you attempt to execute it. The goal then is to use a specialized image that contains bzt for running the performance tests.

Solution Overview

To run your performance tests with the correct Docker image, follow these steps:

Build the Custom Docker Image: Create a Docker image that includes bzt and any other necessary dependencies for performance testing.

Push the Custom Image to a Docker Registry: Once the image is built, you need to upload it to a Docker registry so it can be accessed from your GitLab CI pipeline.

Update GitLab CI Configuration: Modify your .gitlab-ci.yml file to use your custom image for the performance tests stage.

Step 1: Build Your Custom Docker Image

Create a Dockerfile that installs bzt (or any other required packages) and build your image. Here’s a simple example of how your Dockerfile might look:

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

Then, build the image:

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

Step 2: Push the Image to a Docker Registry

After building your image, push it to a Docker registry. This might be Docker Hub, GitLab Container Registry, or any other registry you prefer.

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

Step 3: Update the GitLab CI Configuration

Now that your custom image is available in a registry, update your .gitlab-ci.yml file to use this image in the performance tests stage.

Here’s how you might revise your pipeline configuration:

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

Conclusion

By following these steps, you should now successfully be able to run performance tests using a dedicated Docker image in your GitLab pipeline. Remember, the fundamental takeaway is that you can specify a different Docker image for each stage in your .gitlab-ci.yml, enabling a more flexible and efficient testing setup.

With proper Docker images in place for specialized tasks, you can run your CI/CD pipeline with assurance that your tests will execute smoothly.

Feel free to share your experiences with GitLab CI and Docker in the comments below; we’d love to hear how these tips helped you in your projects!