AWS EC2 Instance Cheat Sheet
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Amazon EC2 (Elastic Compute Cloud): A service that provides scalable, secure, and customizable virtual servers (instances) in the cloud.
1. Instance Types:
General Purpose: Balanced compute, memory, and networking (e.g., t2.micro, t3.medium).
Compute Optimized: Best for compute-intensive applications (e.g., c5.large).
Memory Optimized: Ideal for memory-heavy applications (e.g., r5.large).
Storage Optimized: Optimized for high-performance storage (e.g., i3.large).
2. Pricing Models:
On-Demand: Pay per hour or second without long-term commitments. Best for short-term or unpredictable workloads.
Reserved Instances: Pre-pay for a 1 or 3-year term and get significant discounts. Ideal for steady, long-term workloads.
Spot Instances: Bid for unused capacity at lower prices but can be interrupted by AWS when needed. Great for non-critical tasks.
Savings Plans: Flexible pricing based on consistent usage with discounts.
3. Key Features:
Elastic IP: Static IP address you can move across instances.
Auto Scaling: Automatically adjusts instance capacity based on traffic.
Security Groups: Acts like a firewall, controlling traffic to and from the instance.
Key Pairs: SSH keys for secure access to your instance.
4. Storage Options:
EBS (Elastic Block Store): Persistent storage that can be attached/detached from instances. EBS volumes can be backed up via snapshots.
Instance Store: Temporary storage that’s lost when the instance stops or terminates.
5. Real-Life Example:
If you’re hosting a new web application, you could start with a t2.micro instance (free tier), set up your app, and use Security Groups to allow HTTP/HTTPS traffic. As traffic grows, scale up to a larger instance or use Auto Scaling to automatically add resources during peak times (like holiday sales). For cost savings, you can switch to Spot Instances for non-critical workloads.
6. Commands:
Launch an EC2 instance:
aws ec2 run-instances --image-id <AMI-ID> --instance-type t2.micro --key-name MyKeyPair --security-group-ids <SG-ID>Stop an instance:
aws ec2 stop-instances --instance-ids <Instance-ID>Terminate an instance:
aws ec2 terminate-instances --instance-ids <Instance-ID>
Conclusion:
AWS EC2 allows you to scale your computing needs with ease. It provides flexibility with various instance types and pricing models, making it a powerful solution for anything from small projects to large-scale enterprise systems.
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