How to branch traffic weight in alb's listener when there is a legacy server (EC2) and a new server (ECS-Fargate). (with ECS Blue/Green Deploy)

Question

For the above question, create a target group on each server and set the listener weight distribution.
However, when a new server uses ECS BlueGreen deployment, if there is a target group (legacy server) other than the target group set in the Deploy step, an error occurs and deployment is not possible.

I'm wondering if you have any solutions or suggestions.

Answer

Hi,

This post seems to describe exactly what you want to achieve: https://aws.amazon.com/blogs/containers/how-to-use-multiple-load-balancer-target-group-support-for-amazon-ecs-to-access-internal-and-external-service-endpoint-using-the-same-dns-name/

See its illustration:

![Enter image description here](/media/postImages/original/IMeGMqJr4cTX2Ix7Ld644suQ)

Best,

Didier

How to branch traffic weight in alb's listener when there is a legacy server (EC2) and a new server (ECS-Fargate). (with ECS Blue/Green Deploy)

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