Aws Developer Associate
AWS Developer Associate
EC2
EC2 is a fundamental building block for many cloud-based applications and services
Instance types
EC2 instances are optimized for different use cases:
- General purpose
- Compute optimized
- Memory optimized
- Storage optimized
- Accelerated computing
- High performance computing
EBS and EFS
| Feature | Amazon EFS | Amazon EBS |
|---|---|---|
| Use Case | Shared file storage across instances | Block-level storage for individual instances |
| Access Method | NFS protocol | Raw block device attached to an instance |
| Scalability | Scales automatically with storage needs | Requires manual adjustment or additional volumes |
| Durability and Availability | Redundantly stored across AZs | Durability tied to specific volume type and infrastructure |
| Typical Applications | Content management, web serving, big data | Boot volumes, Databases, transactional workloads |
scalability vs high availability (HA):
scalability is about handling growth and maintaining performance as the workload increases, high availability is about ensuring consistent uptime and reliability of the system, even during failures or maintenance events.
Elastic Load Balancer
Load balancers are servers that forward traffic to multiple servers downstream:
- single point of access
- distribute load
- health checks on instances
Type of load balancers on AWS:
- Classic Load Balancer (CLB) deprecated
- Application Load Balancer (ALB)
- Network LB (NLB)
- Gateway LB (GWLB)
ALB
Routing based on:
- URL
- hostname
- query string params
Great for microservices and containers
These load balancers can route to multiple target groups:
- EC2 instances
- ECS tasks
- Lambda functions
- IP Addresses