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Your understanding of the setup and relationships between ALB, ECS, and EC2 is largely correct. Let me confirm and clarify a few points:
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Your setup process for ALB and ECS is accurate. You correctly outlined the steps from creating an ECS cluster to connecting the ECS service with ALB.
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The relationship between ECS Tasks and containers is correctly described. An ECS Task can indeed contain one or more containers, and these containers share the same network namespace within the Task.
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You're right that the ALB's target is the ENI (Elastic Network Interface) or IP address of the ECS Task, not the individual containers within the Task.
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Your explanation of how ALB delivers requests to containers is accurate. The ALB Listener receives the request, routes it to the Target Group, which then delivers it to the ECS Task. The port mapping in the Task Definition determines how the request reaches the specific container.
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The relationship between ECS Service and ALB is correctly described. The ECS Service does indeed manage the Tasks and automates their registration with the ALB's Target Group.
One small clarification: When creating the ALB Target Group (step 6), if you're using Fargate, you would select 'IP' as the target type. If you're using EC2 launch type, you could use either 'IP' or 'Instance' depending on your networking mode.
Also, it's worth noting that when using the EC2 launch type, you have the option to register the EC2 instances themselves as targets, rather than the individual tasks. This is done by selecting 'Instance' as the target type and is useful in scenarios where you want to maximize resource utilization on your EC2 instances.
Overall, your understanding demonstrates a solid grasp of how these AWS services interact to create a scalable and manageable containerized application infrastructure.
Sources
Fully Managed Container Orchestration – Amazon Elastic Container Service (Amazon ECS) FAQs – AWS
Getting started with Application Load Balancers using the AWS CLI - Elastic Load Balancing
안녕하세요. 다음 영상이 유사한 정보를 담고 있는 것 같은데 참고해 보시기 바랍니다. https://www.youtube.com/watch?v=OMn866JBEtQ
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