Optimizing AWS EKS: How to Use One Load Balancer for Multiple Subdomains

Using a single AWS Application Load Balancer (ALB) for multiple subdomains in an EKS cluster can significantly reduce costs and simplify management. This method involves configuring Ingress resources to route traffic for different subdomains through one ALB. Key steps include installing the AWS Load Balancer Controller, creating a security group for controlled access, defining Ingress and service configurations, and applying these configurations using `kubectl`. This setup enhances resource efficiency and security, especially when managing internal tools or services within an EKS cluster.