cfn-alb-host is a Lambda-backed custom resource that makes it
dead simple to use a single load balancer with different backends per hostname.
AWSTemplateFormatVersion: "2010-09-09"
Resources:
# have a target group and ALB listener defined somewhere...
MyVhost:
Type: Custom::AlbVhost
Properties:
ServiceToken: !ImportValue AlbVhost
HostHeader: mysubdomain.example.com
TargetGroupArn: !Ref TargetGroup
ListenerArn: !Ref Listener
# if you are associating an EC2 Container Service (ECS) service
# with the target group, you will want to add a dependency on
# the vhost - ECS will complain about an unassociated load balancer
# otherwise.
Service:
Type: AWS::ECS::Service
DependsOn: [MyVhost]
Properties:
LoadBalancers:
- ContainerName: # whatevs
ContainerPort: # whatevs
TargetGroupArn: !Ref TargetGroupNote that neither CloudFormation, Lambda nor Load Balancers are global resources, so you will have to deploy the helper stack into each region that you wish to use this in.