How to Map Sub Domains created in Route 53 to application running in EC2 instance with different port

I have springboot application with different ports hosted in ec2 instance Domain in Route 53

Domain Name : mydomain.com

App A - 8081, App B - 8085, App c - 8088

Instance IP : 10.xx.xx.xx

domain : test1.mydomain.com point to 10.xx.xx.xx:8081/landingpage &

test2.mydomain.com point to 10.xx.xx.xx:8085/landingpage & test3.mydomain.com point to 10.xx.xx.xx:8088/landingpage

I have some idea in creating Load Balancer and Target Groups in beginner level. Your views are always welcome.

Solution

As stated by Marcin, Route53 can't resolve port, this is a workaround. Assuming you already open two ports on your EC2 instance:

Create 2 target groups. One to port 8085, one to port 8088. Register your instance to those 2 target groups
Create application load balancer (ALB). Create 2 CNAME record with subdomain as your need, route both to your ALB DNS
Optional: Create a certificate for your domain (ACM), it should enable SSL on *.example.com, register the certificate to your HTTPS load balancer.
Create listening rule on port 443 of your ALB (80 if you don't use SSL), route depending on your host name, each host name will route to one target group.