Designing Highly Available System

• A highly available system is one that can withstand some measure of degradation while remaining available.

• In a highly available system, downtime is minimized as much as possible, and minimal human intervention is required.

Elastic Load Balancing

• Elastic Load Balancing is a key component of creating a highly available architecture.

• ELB automatically distributes incoming application traffic across multiple targets, such as EC2 instances, containers, IP addresses, and Lambda functions.

• It can handle the varying load of your application traffic in a single Availability Zone or across multiple Availability Zones.

Load Balancer Monitoring

You can use the following features to monitor your load balancers, analyze traffic patterns, and troubleshoot issues with your load balancers and targets:

1. Amazon CloudWatch metrics
2. Access logs
3. AWS CloudTrail logs

Types of Load Balancer

Example Architecture

Use Cases