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Is it possible to have an application running on an EC2 instance and have a load balancer listen on port 80 but proxy it to the instances port 8080?
I cannot seem to get this to work. What setting to I need to change. I am running the cluster behind an application load balancer.
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You define the instance port in the Target Group. You need to configure the Target Group to use port 8080. Then point the Application Load Balancer's port 80 listener to the Target Group. The ALB will listen on port 80, and forward requests to port 8080 on the Target Group instances.
What is port forwarding? Port forwarding lets you connect to specific virtual machines by using the Load Balancer frontend IP address and port number. Load Balancer, upon receiving the traffic on a certain frontend port, will forward traffic to the target virtual machine on a specific backend port.
By creating an AWS Load Balancer, you can let the load balancer listen on port 80 or 443 and have it route traffic to another port on your EC2 instance. Usually, a load balancer sits in front of multiple EC2 instances and manages traffic coming in.
Adding answer with AWS management snippets .
Add the instance port in the target group, refer below image for it. for example i've added tomcat 8080 port to the target group port/
Make sure that your ELB is internet facing. refer below image of ELB summary , which says that my ELB is internet -facing. and check that your routing is properly added.
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You define the instance port in the Target Group. You need to configure the Target Group to use port 8080. Then point the Application Load Balancer's port 80 listener to the Target Group. The ALB will listen on port 80, and forward requests to port 8080 on the Target Group instances.
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