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AWS ELB vs AWS ALB vs Google L7 LB

Created with Marp 12 August 2016

Updated 16 Jan 2018

What is Load Balancer

  • Common for web applications to be served by a number of servers, for performance and availability
  • Load balancer routes traffic to your servers
  • How to decide where to route traffic to?

What is L4 and L7

  • ISO OSI Model

AWS Classic Load Balancer (formerly Elastic Load Balancer)

  • L4 Load Balancer (TCP level)
  • Understand TCP traffic only (with minimal support for HTTP headers)
  • Route traffic based on TCP port number
  • Route traffic to only one Autoscaling Group (i.e. can only route to one application)

AWS Application Load Balancer

  • L7 Load Balancer
  • Understand HTTP traffic (and websocket too)
  • Route traffic based on path-based rules
  • Route traffic to multiple Autoscaling Groups (requests to /jane and requests to /linda are routed to different applications)

Google L7 Load Balancer

  • L7 Load Balancer
  • Understand HTTP traffic
  • Route traffic based on host name, and path rules
  • Route traffic to multiple Target Groups (requests to example.com/jane and example.org/jane are routed to different applications)

Why route requests based on host name and path?

  • www.example.com route to web application server
  • admin.example.com route to admin panel server
    • require host-based rules
  • www.example.com/static route to static file servers
    • require path-based rules

Why exciting? Pricing!

  • ELB
    • $0.025 per ELB-hour ($18/month)
    • $0.008 per GB
  • ALB
    • $0.0225 per ALB-hour ($16.2/month)
    • $0.008 per LCU-hour (roughly translate to connections and throughput per hour)
  • Google L7
    • $0.025 per hour (5 rules included) ($18/month)
    • $0.010 per additional rule
    • $0.008 per GB

Still don't get it?

If you have 3 applications

  • ELB
    • $0.025 * 3
    • $54 per month + $0.008 per GB
  • ALB
    • $0.0225 * 1
    • $16.2 per month + $0.008 per “throughput”
  • Google L7
    • $0.025 * 1
    • $18 per month + $0.008 per GB

If you have 10 applications

  • ELB
    • $0.025 * 10
    • $180 per month + $0.008 per GB
  • ALB
    • $0.0225 * 1
    • $16.2 per month + $0.008 per “throughput”
  • Google L7
    • $0.025 * 1 + $0.010 * 5
    • $54 per month + $0.008 per GB