Why EC2 matters for compute in AWS - See It in Action

Why EC2 Matters for Compute

📖 Scenario: You are starting a small web application project. You need a place to run your application code on the cloud. Amazon EC2 (Elastic Compute Cloud) lets you rent virtual computers to run your programs.Think of EC2 as renting a computer in the cloud that you can control, just like your own laptop, but accessible from anywhere.

🎯 Goal: Build a simple EC2 instance configuration using AWS CloudFormation to launch a virtual server with a specific name and instance type.This will help you understand how EC2 provides compute power in the cloud.

📋 What You'll Learn

Create a CloudFormation template with a resource of type AWS::EC2::Instance

Set the instance type to t2.micro

Name the instance with the tag Key 'Name' and Value 'MyFirstEC2Instance'

Use the Amazon Linux 2 AMI ID for the instance

Ensure the template is valid and deployable

💡 Why This Matters

🌍 Real World

EC2 instances are the basic building blocks for running applications, websites, and services on AWS. Knowing how to configure them is essential for cloud computing.

💼 Career

Cloud engineers and developers often create and manage EC2 instances to deploy software and scale infrastructure.

1

Create the basic CloudFormation template structure

Create a CloudFormation template starting with the root keys AWSTemplateFormatVersion set to '2010-09-09' and an empty Resources section.

AWS

AWSTemplateFormatVersion: '2010-09-09'
Resources:
# Your code here

Hint

Start with the basic CloudFormation template keys.

2

Add an EC2 instance resource with instance type

Inside the Resources section, add a resource named MyEC2Instance of type AWS::EC2::Instance and set its InstanceType property to t2.micro.

AWS

AWSTemplateFormatVersion: '2010-09-09'
Resources:
  MyEC2Instance:
    Type: AWS::EC2::Instance
    Properties:
      InstanceType: t2.micro
# Your code here

Hint

Define the EC2 instance resource with the correct type and instance size.

3

Add the Amazon Linux 2 AMI ID to the instance

Add the ImageId property to MyEC2Instance and set it to the Amazon Linux 2 AMI ID ami-0c02fb55956c7d316 (this is a common AMI in us-east-1 region).

AWS

AWSTemplateFormatVersion: '2010-09-09'
Resources:
  MyEC2Instance:
    Type: AWS::EC2::Instance
    Properties:
      InstanceType: t2.micro
      ImageId: ami-0c02fb55956c7d316
# Your code here

Hint

Use the correct AMI ID for Amazon Linux 2 to launch the instance.

4

Add a Name tag to the EC2 instance

Add a Tags property under Properties of MyEC2Instance. Set it to a list with one tag object having Key as Name and Value as MyFirstEC2Instance.

AWS

AWSTemplateFormatVersion: '2010-09-09'
Resources:
  MyEC2Instance:
    Type: AWS::EC2::Instance
    Properties:
      InstanceType: t2.micro
      ImageId: ami-0c02fb55956c7d316
      Tags:
        - Key: Name
          Value: MyFirstEC2Instance
# Your code here

Hint

Tags help identify your instance. Add the Name tag as shown.

Practice

1. What is the main benefit of using Amazon EC2 for computing tasks?

easy

A. It automatically writes code for your applications.

B. It stores large amounts of data permanently.

C. It manages your email communications.

D. It provides virtual servers that you can start and stop anytime.

Solution

1. Step 1: Understand EC2's purpose

   EC2 offers virtual computers (servers) in the cloud that you can control.

2. Step 2: Identify the key feature

   You can launch, stop, and scale these virtual servers anytime as needed.

3. Final Answer:

   It provides virtual servers that you can start and stop anytime. -> Option D

4. Quick Check:

   EC2 = virtual servers you control [OK]

Hint: EC2 = virtual computers you can manage anytime [OK]

Common Mistakes:

• Confusing EC2 with storage services
• Thinking EC2 writes code automatically
• Mixing EC2 with email or messaging services

2. Which of the following is the correct way to describe an EC2 instance?

easy

A. A virtual server you can launch in the cloud.

B. A database service for storing records.

C. A software tool for editing documents.

D. A physical server you buy and install in your office.

Solution

1. Step 1: Define EC2 instance

   An EC2 instance is a virtual server running in the cloud, not a physical machine.

2. Step 2: Match description

   A virtual server you can launch in the cloud. correctly states it is a virtual server you can launch anytime.

3. Final Answer:

   A virtual server you can launch in the cloud. -> Option A

4. Quick Check:

   EC2 instance = virtual cloud server [OK]

Hint: EC2 instance = virtual server, not physical [OK]

Common Mistakes:

• Thinking EC2 is a physical server
• Confusing EC2 with software tools
• Mixing EC2 with database services

3. Consider this scenario: You launch an EC2 instance, run a compute-heavy task, then stop the instance. What happens to the compute power and billing?

medium

A. Compute power stops and billing stops when the instance is stopped.

B. Compute power continues but billing stops when the instance is stopped.

C. Compute power stops but billing continues when the instance is stopped.

D. Compute power and billing continue even if the instance is stopped.

Solution

1. Step 1: Understand EC2 instance stop behavior

   When you stop an EC2 instance, the virtual server stops running, so compute power is no longer used.

2. Step 2: Understand billing during stop

   Billing for compute stops because you are not using the server, though storage may still be billed separately.

3. Final Answer:

   Compute power stops and billing stops when the instance is stopped. -> Option A

4. Quick Check:

   Stopped instance = no compute, no billing [OK]

Hint: Stop instance = stop compute and billing [OK]

Common Mistakes:

• Assuming billing continues after stopping
• Thinking compute runs when stopped
• Confusing storage billing with compute billing

4. You tried to launch an EC2 instance but got an error saying your account has reached the instance limit. What should you do to fix this?

medium

A. Change the instance type to a larger size.

B. Delete your AWS account and create a new one.

C. Request a limit increase from AWS support.

D. Restart your computer and try again.

Solution

1. Step 1: Identify the cause of the error

   A limit error means your AWS account has a maximum number of instances allowed, which you reached.

2. Step 2: Find the correct fix

   You can request AWS to increase this limit by contacting support, which is the proper solution.

3. Final Answer:

   Request a limit increase from AWS support. -> Option C

4. Quick Check:

   Instance limit error = request increase [OK]

Hint: Limit errors need AWS support request [OK]

Common Mistakes:

• Deleting account unnecessarily
• Changing instance size won't fix limits
• Restarting computer does not affect AWS limits

5. You want to run a web application that needs to handle sudden traffic spikes without delay. How does EC2 help you achieve this?

hard

A. By automatically writing code to optimize your app.

B. By letting you quickly launch more instances to add compute power as needed.

C. By storing all your data in a single large server.

D. By sending emails to users when traffic spikes.

Solution

1. Step 1: Understand traffic spikes and compute needs

   Sudden traffic spikes require more computing power to handle extra users smoothly.

2. Step 2: How EC2 supports scaling

   EC2 allows you to launch more virtual servers quickly, adding compute power to meet demand.

3. Final Answer:

   By letting you quickly launch more instances to add compute power as needed. -> Option B

4. Quick Check:

   EC2 enables fast scaling for traffic spikes [OK]

Hint: EC2 lets you add servers fast for traffic spikes [OK]

Common Mistakes:

• Thinking EC2 writes code automatically
• Confusing compute scaling with data storage
• Assuming EC2 manages emails for traffic