Elastic Load Balancer

• Forward traffic to downstream Ec2 instances
• Single point of access (DNS) to your application
• Provide SSL termination (Https)
• Enforce session stickiness with cookies
• High availability across zones
• Enables Health checks on EC2 instances
• Separate public traffic from private traffic??
• Can setup as internal (private) or external (public) ELBs

Elastic Load Balancer is a managed load balancer: AWS guarantees uptime, upgrades, maintenance

• It will cost less to setup on your own but it will be a lot more effort
• Services ELBs are Integrated with :
  • EC2
  • EC2 auto scaling groups
  • Amazon ECS
  • AWS Certificate Manager (ACM)
  • Cloud watch
  • Route 53
  • AWS WAF
  • AWS Global Accelerator

Target Groups

• Target groups are just a group of Ec2 instances and TG are attached to an ELB
• Target groups enable Load balancing to multiple EC2 instances. ELB -> TG - > Group of Instances
• However, it does not allow auto scaling
• It also allows to load balance to multiple applications on the same machine( ex containers, ECS)???

Difference between ASG and Target group