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Explanation
Amazon Elastic Compute Cloud (EC2) provides resizable virtual servers that run applications in the cloud. EC2 instances are created from Amazon Machine Images (AMIs) and are launched within a Virtual Private Cloud (VPC). Each instance type defines a combination of CPU, memory, storage, and networking capacity optimized for different workloads. EC2 supports multiple purchasing models—On-Demand, Reserved Instances, Savings Plans, and Spot Instances—to balance flexibility and cost. High availability is achieved by distributing instances across multiple Availability Zones and scaling horizontally using Auto Scaling groups.
Table
| Component | Purpose |
|---|---|
| AMI | OS and software template |
| Instance Type | CPU and memory profile |
| EBS | Persistent block storage |
| Security Group | Instance-level firewall |
Example
A backend service is deployed on EC2 instances using a Linux AMI. Instances are placed in multiple Availability Zones behind a load balancer. Auto Scaling increases the number of instances during peak traffic and reduces them during off-peak hours. EBS volumes store application data persistently. Security groups restrict inbound traffic to required ports only. The system remains available and cost-efficient under varying load.
Use Cases
• Lift-and-shift migration of legacy applications
• Custom software requiring OS-level control
• Batch processing workloads
• Development and testing environments
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Amazon EC2
