• Elastic Load Balancing
  • Target group
• Application load balancer (ALB)
• Network load balancer (ELB)
• Gateway load balancer (GWLB)

Elastic Load Balancing

Managed load balancing service that distributes traffic to EC2 instances, containers and IP addresses (+ metrics to CloudWatch).

• HTTP, HTTPS, TCP and SSL (Secure TCP)
• Can be external or internal facing
• Each load balancer is given a DNS name
• Recognizes and responds to unhealthy instances
• Sticky sessions (load balancer-generated cookies only)

Target group

The target group is the connection between the load balancer and, for example, an autoscaling group.

Application load balancer (ALB)

• HTTP, HTTPS (Layer 7)

Network load balancer (ELB)

• TCP, TLS, UDP (Layer 4)

Gateway load balancer (GWLB)

• third-party virtual appliance from AWS Marketplace