Updating Your ECS Service with Multiple Containers

Discover how to effectively update your ECS service to ensure that all containers reflect the latest changes in your pipeline.
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Updating Your ECS Service with Multiple Containers: A Step-by-Step Guide

In modern DevOps practices, ensuring that your containerized applications are up-to-date is crucial for both functionality and security. This post tackles a common challenge faced by developers: how to update an Amazon ECS (Elastic Container Service) service that runs two containers with the same image but different entry points, ensuring both are updated simultaneously. If you’ve been trying to accomplish this but ended up only updating one container, then this guide is for you.

The Problem

You have a service running on ECS comprised of a single task containing two containers, both using the same Docker image but with different entry points. Your aim is to automate the deployment process through a pipeline, which updates the service to pull in the latest image pushed to your container registry after running tests. The issue arises when your script only updates one of the containers, leaving the other outdated.

The Solution

After some experimentation and troubleshooting, the solution to ensuring both containers are updated can be achieved with a slight modification in your existing script. Below, I’ll outline the steps needed and provide the updated code examples.

Step 1: Modify the Task Definition Update

When updating the task definition, it’s essential to reference both containers and their respective images. Here’s how to adjust your existing code:

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

Step 2: Deploy the Updated Task Definition

Once the task definition has been updated to reflect the changes to both containers, you can proceed with updating the ECS service as you normally would:

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

Conclusion

By ensuring that both container images in your ECS task definition are updated, you can deploy changes to your environment seamlessly, maintaining the integrity and functionality of your application. With this updated script, you can automate the process within your CI/CD pipeline, reducing the likelihood of errors and improving deployment efficiency.

Whether you are a seasoned DevOps engineer or just starting your journey with ECS, these steps will help streamline your container management. If you have any further questions or encounter any issues, feel free to reach out in the comments below!

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