AWS Elastic Load Balancer (ELB) is a managed load balancing service offered by Amazon Web Services (AWS) that helps distribute incoming application traffic across multiple targets, such as EC2 instances, containers, and IP addresses. It plays a critical role in building highly available architectures by providing several advantages and use cases. Let's explore them in detail:
1. High Availability and Fault Tolerance:
* ELB automatically distributes incoming traffic across multiple backend instances, ensuring that if any instance fails or becomes unhealthy, traffic is seamlessly routed to healthy instances.
* ELB continuously monitors the health of backend instances and removes any unhealthy instances from the load balancing rotation, thereby enhancing fault tolerance and ensuring high availability of the application.
2. Scalability and Elasticity:
* ELB automatically scales its capacity based on incoming traffic load, ensuring that the application can handle increasing levels of traffic without manual intervention.
* It supports automatic scaling with integration to AWS Auto Scaling, allowing you to add or remove instances based on predefined policies, ensuring optimal performance and cost efficiency.
3. Load Balancing Algorithms:
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