ELB - Elastic Load Ba...

distribute the load.

• An Elastic Load Balancer is a managed load balancer.

  • AWS guarantees that it will be working.

  • AWS takes care of upgrades, maintenance, high availability.

  • AWS provides only a few configuration knobs.

• It costs less to setup your own load balancer, but it will be a lot more effort on your end.

• It is integrated with many AWS offerings / services.

  • EC2, EC2 Auto Scaling Groups, Amazon ECS.

  • AWS Certificate Manager (ACM), CloudWatch.

  • Route 53, AWS WAF, AWS Global Accelerator.

Types of load balancer on AWS

• AWS has 4 kinds of managed Load Balancers

• Classic Load Balancer (v1 - old generation) – 2009 – CLB

  • HTTP, HTTPS, TCP, SSL (secure TCP)

• Application Load Balancer (v2 - new generation) – 2016 – ALB

  • HTTP, HTTPS, WebSocket

• Network Load Balancer (v2 - new generation) – 2017 – NLB

  • TCP, TLS (secure TCP), UDP

• Gateway Load Balancer – 2020 – GWLB

  • Operates at layer 3 (Network layer) – IP Protocol

• Overall, it is recommended to use the newer generation load balancers as they provide more features.

• Some load balancers can be setup as internal (private) or external (public) ELBs.

Security Groups in Load Balancer