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Scaling.md

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AWS ELB: Elastic Load Balancing

ELB

ELB is a server that forward traffic to multiple EC2 servers.

ELB: ALB (Application Load Balancer)

ALB is a load balancer designed for HTTP requests.

ELB: NLB (Network Load Balancer)

NLB is a load balancer designed for TCP / UDP.

ELB: GLB (Gateway Load Balancer)

GLB is a load balancer designed for GENEVE Protocol on IP packets.
Used for packet inspection, intrusion detection.

AWS ASG: Auto Scaling Groups

ASG

ASG automatically scales your infrastructure based on the received load.
Ensure we have a min / max number of instances running.
Terminate not responding instances.
Should be used with a load balancer.

Scaling Policies

Manual Scaling

Update the size of an ASG manually. Usually a redflag.

Dynamic Scaling

Respond to changing demand.

  • Step scaling: CloudWatch alarm triggered (CPU > 70%) => Add or remove instances.
  • Target Tracking Scaling: Target CPU usage around 40%, scale accordingly.
  • Scheduled Scaling: Anticipate based on known usage patterns.
  • Predictive Scaling: Uses Machine Learning to predict future traffic ahead of time.