description AWS Elastic Load Balancing (ELB) Overview
AWS Elastic Load Balancing (ELB) is an Amazon Web Services service that automatically distributes incoming application traffic across multiple targets, supporting high availability and fault tolerance in cloud architectures.
help AWS Elastic Load Balancing (ELB) FAQ
What types of load balancers does AWS Elastic Load Balancing offer?
AWS offers four main types of load balancers under ELB: Application Load Balancer (ALB), Network Load Balancer (NLB), Gateway Load Balancer (GWLB), and the older Classic Load Balancer (CLB). Each type operates at different layers of the OSI model to handle specific traffic types.
How is AWS Elastic Load Balancing priced?
You are billed for AWS ELB based on the hours the load balancer is provisioned and the amount of data (in GB) processed through it. Exact rates vary depending on whether you are using an Application, Network, or Gateway Load Balancer.
Can an Application Load Balancer route traffic based on HTTP headers?
Yes, ALBs operate at Layer 7 and can route traffic based on advanced HTTP parameters like headers, URL paths, and hostnames. This allows developers to route requests for different microservices to specific target groups.
Does AWS Elastic Load Balancing support cross-zone load balancing?
Yes, ELB supports cross-zone load balancing, which allows the service to distribute incoming traffic evenly across registered instances in multiple Availability Zones. This ensures high availability and fault tolerance even if one entire zone goes down.
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