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Amazon EC2

Public and Private Subnets

Amazon Machine Images(AMIs)

Instance Types

Overview

Service Description: Amazon EC2 is a web service that provides resizable compute capacity in the AWS cloud.

Instances: Virtual servers launched on the AWS cloud are known as instances.

Amazon Machine Images (AMIs)

Definition: Preconfigured templates for EC2 instances.

Contents: Includes the operating system and any software packages needed to launch the instance.

Supported Operating Systems:

Amazon Linux

Ubuntu

Windows Server

MacOS

Red Hat Enterprise Linux

SUSE Linux Enterprise Server

Fedora

Debian

CentOS

Gentoo Linux

Oracle Linux

FreeBSD

EC2 Compute Units (ECUs): Provide a relative measure of the integer processing power of an EC2 instance.

Control and Access

Full Control: Users have root/admin access at the operating system layer.

Key Pairs:

Components: A public key stored by AWS and a private key file stored by the user.

Usage:

Windows AMIs: Private key file required to obtain the password for logging in.

Linux AMIs: Private key file used to securely SSH into the instance.

Metadata and User Data

User Data:

Purpose: Supplied by the user at instance launch, typically in the form of a script. It must be base64-encoded.

Limit: 16KB.

Availability: Not encrypted and accessible at

http://169.254.169.254/latest/user-data⁠

Instance Metadata:

Purpose: Data about the instance used for configuration or management.

Access: Available at

http://169.254.169.254/latest/meta-data/⁠

(trailing "/" required).

Usage Example: On Linux, use the curl command to view metadata: curl http://169.254.169.254/latest/meta-data/.

Query Tool: Instance Metadata Query tool for querying metadata without typing out the full URI.

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