Elastic Load Balancing

Elastic Load Balancing automatically distributes your incoming traffic across multiple targets (EC2 instances, containers, IP addresses) in one or more Availability Zones.

It monitors the health of its registered targets and routes the traffic only to healthy targets.

Benefits of using Load Balancer #

• Spread load across multiple downstream instances

• Expose a single point of access (DNS) to the application

• Seamlessly handle failures of downstream instances

• Do regular health checks to the instances

• SSL termination

• High Availability across Availability Zones

• ELB is a managed Load Balancer

  • AWS is responsible for upgrades, maintenance and High Availability
  • AWS provides only a few configuration items

3 kinds of Load Balancers offered by AWS #

1. Application Load Balancer #

• HTTP / HTTPS only (layer 7)

2. Network Load Balancer #

• ultra high performance, allows for TCP (layer 4)

3. Gateway Load Balancer #

• Supports GENEVE protocol. Built for extra security (layer 3)

» Sources « #

• https://aws.amazon.com/elasticloadbalancing/
• https://aws.amazon.com/compare/the-difference-between-the-difference-between-application-network-and-gateway-load-balancing/
• https://medium.com/@xiaotiancheng.orange/comparison-between-alb-nlb-and-glb-4444f3291173
• https://tutorialsdojo.com/application-load-balancer-vs-network-load-balancer-vs-gateway-load-balancer/

Stephane Maarek’s AWS playlists on YouTube: https://www.youtube.com/@StephaneMaarek/playlists Full YouTube Rahul’s AWS Course: https://www.youtube.com/playlist?list=PL7iMyoQPMtAN4xl6oWzafqJebfay7K8KP

» References « #

• Scalability & High Availability
• Auto Scaling Groups

» Disclaimer « #