Part 7: (Amazon ELB Series) Amazon ELB supported Algorithms and Protocols

Algorithms supported :

Currently Amazon ELB only supports Round Robin(RR) and Session Sticky Algorithms in its portfolio. Round Robin algorithm can be used for load balancing traffic between

•  Web/App EC2 instances deployed under Amazon ELB which are designed stateless
•  Web/App EC2 instances deployed under Amazon ELB which synchronizes the state between them using Unicast TCP
•  Web/App EC2 instances deployed under Amazon ELB which synchronizes the state using common data stores like MemCached , ElastiCache , Database etc.

Session Sticky algorithm can be used for load balancing traffic between

• Web/App EC2 instances  deployed under Amazon ELB which are designed to be statefull

Current Version of ELB does not support Weighted or Least Connection algorithms like other Reverse proxies. We can probably expect these algorithms to be supported in future.


Protocols supported :

Currently Amazon ELB only supports following protocols: HTTP, HTTPS (Secure HTTP), SSL (Secure TCP) and TCP protocols. ELB supports load balancing for the following TCP ports: 25, 80, 443, and 1024-65535. In case RTMP or HTTP Streaming protocol is needed, we need to use Amazon CloudFront CDN in your architecture.

Other Amazon ELB related Articles
Monitoring ELB with Amazon CloudWatch

Configuring Amazon ELB using AWS Management Console

Amazon ELB Implementation Architectures

Amazon Elastic Load balancing benefits

Why do we need Elastic Load Balancing ?

Offloading SSL in Amazon ELB

Amazon ELB and Flash Traffic

Dissecting Amazon ELB: 18 things you should know

Amazon ELB Supported Algorithms and Protocols