Wednesday, February 15, 2012

Part 2:(Amazon ELB Series) ELB Implementation Architectures

ELB Architecture 1: Single Server Setup
  • Having an Amazon ELB configured before Single Web/App EC2 instance is not a common approach
  • Not recommended because no significant benefit to the application
ELB Architecture 2: Multi-Server setup inside an AZ

  • HTTP/S requests hitting the ELB are directed to Web/App EC2
  • Multiple Web/App EC2 instances can reside inside the same AZ under the ELB tier
  • Simple Round Robin , Round Robin with Session Sticky algorithms can be configured
  • ELB Load Balances the requests between the Web/App EC2 instances
ELB Architecture 3: Across Multiple AZ's inside a Region
  • HTTP/S requests hitting the ELB are directed to Web/App EC2
  • Multiple Web/App EC2 instances can reside across multiple AZ’s inside a AWS region
  • Simple Round Robin , Round Robin with Session Sticky algorithms can be configured
  • ELB is doing Multi-AZ load balancing
ELB Architecture 4: ELB with Amazon Auto Scaling

  • HTTP/S requests hitting the ELB are directed to Web/App EC2
  • Web/App EC2 are configured with Amazon AutoScaling to scale out/down inside an AZ
  • Amazon ELB can direct the load seamlessly to the Web/App EC2 instances configured with Amazon AutoScaling
ELB Architecture 5 : ELB with Amazon AutoScaling across AZ's











































Web/App EC2 are configured with Amazon AutoScaling to scale out/down across AZ’s inside a Region
Amazon ELB can direct the load seamlessly to the Web/App EC2 instances configured with Amazon AutoScaling
Highly recommended approach



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