Final Answer:
The setup with ELB and ASG is designed to facilitate traffic flow from the Internet to the Elastic Load Balancer (ELB), which distributes requests to an Auto Scaling Group (ASG). The ASG then manages a fleet of web servers (EC2 instances) that interact with a MySQL database hosted on an RDS instance.
Step-by-step explanation:
This architecture is a common and scalable solution for deploying web applications. The Elastic Load Balancer ensures even distribution of incoming traffic across multiple instances in the Auto Scaling Group. The Auto Scaling Group dynamically adjusts the number of EC2 instances based on demand, providing elasticity and high availability.
The flow begins with the Internet sending requests to the ELB, which acts as a central entry point. The ELB distributes these requests across multiple instances within the ASG, enhancing the system's fault tolerance and preventing any single point of failure. The ASG, in turn, manages the scaling of EC2 instances, automatically adjusting capacity based on predefined policies or metrics.
The web servers hosted on EC2 instances process the incoming requests and may retrieve or update data from the MySQL database hosted on an RDS instance. This separation of concerns allows for modular scaling and maintenance of different components in the system. Overall, this setup promotes scalability, reliability, and flexibility, making it well-suited for applications with varying workloads and traffic patterns.