Blue/Green Deployment with AWS ECS Fargate
Blue/Green deployment is a powerful strategy to minimize downtime and reduce risk during application updates. With AWS ECS Fargate, you can deploy new versions of your application seamlessly, ensuring smooth transitions without impacting users.
What is Blue/Green Deployment?
In a Blue/Green Deployment, you have two versions of your app: Green (the current live version) and Blue (the new version). With AWS ECS Fargate, the whole process is smooth and automated. Here's how it works:
When you update your ECS service with the new version (Blue), ECS automatically runs the new tasks alongside the old ones (Green). Your users keep using the Green version while the new Blue version gets ready in the background.
Once the Blue version is up and running, ECS gradually shifts traffic over to it. This ensures there's no downtime for your users, and ECS handles everything behind the scenes. If something goes wrong, the Green version is still running, so there's no disruption. It's like a safe, smooth handoff between the old and new versions!
How it worked
- If you go to ECS in the AWS Management Console and then select
Clusters -> Services -> Tasks, you will notice that there are 2 tasks running. This is because we set a minimum of 2 tasks to be running in the code configuration.
- When you deploy through the CI/CD pipeline, here's what happens: two new pending tasks are automatically created, and the magic begins!
In this process, the Blue represents the new version being spun up, while the Green (the old version) is gracefully drained and phased out.
- The old version is smoothly replaced with the new one!
Once everything is successfully completed, your backend will have experienced zero downtime—the transition from old to new happens seamlessly, keeping your app live and running without a hitch! 🚀