Networking in ECS: VPCs, Security Groups, and Load Balancers

If not default, create VPC: Console > VPC > Create VPC > Resources: VPC and more.

Subnets: Public for internet access.

Create SG: Allow inbound TCP 3000 from anywhere (for testing).

Attach to service.

Create ALB: EC2 > Load Balancers > Create > ALB.

Target group: IP targets, port 3000.

In service creation/update, add load balancer.

Test: ALB DNS name.

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