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Setup ALB

One ALB shall distribute traffic for both service types, EC2 and Fargate.
For that we configure a path-based routing within ALB to forward traffic with

  • /ec2/* to service ec2
  • /fargate/* to service fargate

Create ALB, via Cloudformation template:

aws cloudformation create-stack \
--stack-name external-alb \
--template-body file://./alb-external.yml

Create Fargate based service

  • new service "simplehttp-fargate-service"
  • based on task definition td-simplehttp
  • enable loadbalancing
  • check that securitygroup only allows traffic from ALB

Create EC2 based service

  • new service "simplehttp-ec2-service"
  • based on task definition td-simplehttp-ec2
  • enable loadbalancing
  • check that securitygroup only allows traffic from ALB

Test

Grab public DNS of the ALB and call

  • <public-alb-dns>/fargate/ => reload multiplel times and check response property "local IP"
  • <public-alb-dns>/ec2/ => reload multiplel times and check response property "local IP"