Monday, July 30, 2012

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.

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