Cloud service models (IaaS, PaaS, SaaS) in AWS - Mini Project: Build & Apply

Understanding Cloud Service Models: IaaS, PaaS, SaaS

📖 Scenario: You are learning about cloud computing. You want to organize examples of cloud service models: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). This will help you understand how cloud providers offer different levels of services.

🎯 Goal: Create a simple AWS-themed dictionary that lists examples of IaaS, PaaS, and SaaS services. Then, add a configuration variable to select one model. Next, write code to get the list of services for the selected model. Finally, add a print statement to show the selected services.

📋 What You'll Learn

Create a dictionary named cloud_services with keys 'IaaS', 'PaaS', and 'SaaS' and their AWS service examples as lists

Create a variable named selected_model and set it to 'PaaS'

Write code to get the list of services for selected_model from cloud_services and store it in services_list

Add a print statement to display services_list

💡 Why This Matters

🌍 Real World

Cloud architects and developers often categorize cloud services to choose the right model for their applications.

💼 Career

Understanding IaaS, PaaS, and SaaS helps in designing cloud solutions and communicating with teams and clients.

1

Create the cloud services dictionary

Create a dictionary called cloud_services with these exact keys and values: 'IaaS' with ['EC2', 'EBS', 'VPC'], 'PaaS' with ['Elastic Beanstalk', 'Lambda', 'RDS'], and 'SaaS' with ['WorkMail', 'Chime', 'QuickSight'].

AWS

# Create the cloud_services dictionary with AWS service examples
# Your code here

Hint

Use curly braces to create a dictionary. Keys are strings and values are lists of strings.

2

Set the selected cloud service model

Create a variable called selected_model and set it to the string 'PaaS'.

AWS

cloud_services = {
    'IaaS': ['EC2', 'EBS', 'VPC'],
    'PaaS': ['Elastic Beanstalk', 'Lambda', 'RDS'],
    'SaaS': ['WorkMail', 'Chime', 'QuickSight']
}
# Set selected_model to 'PaaS'
# Your code here

Hint

Assign the string 'PaaS' to the variable selected_model.

3

Get services list for the selected model

Write code to get the list of services for the cloud service model stored in selected_model from the cloud_services dictionary. Store this list in a variable called services_list.

AWS

cloud_services = {
    'IaaS': ['EC2', 'EBS', 'VPC'],
    'PaaS': ['Elastic Beanstalk', 'Lambda', 'RDS'],
    'SaaS': ['WorkMail', 'Chime', 'QuickSight']
}
selected_model = 'PaaS'
# Get the services list for selected_model
# Your code here

Hint

Use the variable selected_model as the key to get the value from cloud_services.

4

Display the selected services

Add a print statement to display the contents of the variable services_list.

AWS

cloud_services = {
    'IaaS': ['EC2', 'EBS', 'VPC'],
    'PaaS': ['Elastic Beanstalk', 'Lambda', 'RDS'],
    'SaaS': ['WorkMail', 'Chime', 'QuickSight']
}
selected_model = 'PaaS'
services_list = cloud_services[selected_model]
# Print the services_list
# Your code here

Hint

Use the print() function to show the list of services.

Practice

1. Which cloud service model lets you rent virtual machines and storage but requires you to manage the operating system and applications yourself?

easy

A. Function as a Service (FaaS)

B. Infrastructure as a Service (IaaS)

C. Software as a Service (SaaS)

D. Platform as a Service (PaaS)

Solution

1. Step 1: Understand IaaS characteristics

   IaaS provides virtual machines and storage but leaves OS and app management to the user.

2. Step 2: Compare with other models

   PaaS manages the platform, SaaS provides ready software, and FaaS is event-driven functions.

3. Final Answer:

   Infrastructure as a Service (IaaS) -> Option B

4. Quick Check:

   IaaS = Rent VMs + manage yourself [OK]

Hint: IaaS = rent machines, you manage OS/apps [OK]

Common Mistakes:

• Confusing PaaS with IaaS
• Thinking SaaS includes server management
• Mixing FaaS with IaaS

2. Which of the following is the correct description of Platform as a Service (PaaS)?

easy

A. You install and manage software on rented virtual machines.

B. You use ready-made software online without installation.

C. You manage physical servers in your own data center.

D. You use a platform to build and run applications without managing servers.

Solution

1. Step 1: Identify PaaS features

   PaaS provides a platform to develop and run apps without handling server management.

2. Step 2: Eliminate other options

   Installing and managing software on rented virtual machines describes IaaS. Using ready-made software online without installation describes SaaS, and managing physical servers in your own data center is on-premises management.

3. Final Answer:

   You use a platform to build and run applications without managing servers. -> Option D

4. Quick Check:

   PaaS = platform for apps, no server management [OK]

Hint: PaaS = build apps, no server hassle [OK]

Common Mistakes:

• Confusing PaaS with SaaS
• Thinking PaaS requires server management
• Mixing on-premises with cloud models

3. You want to use an online email service without installing or managing any software. Which cloud model does this represent?

medium

A. Infrastructure as a Service (IaaS)

B. Platform as a Service (PaaS)

C. Software as a Service (SaaS)

D. Database as a Service (DBaaS)

Solution

1. Step 1: Understand SaaS usage

   SaaS provides ready-to-use software online without installation or management.

2. Step 2: Match the example

   Online email services like Gmail are classic SaaS examples.

3. Final Answer:

   Software as a Service (SaaS) -> Option C

4. Quick Check:

   SaaS = ready software online [OK]

Hint: SaaS = use software online, no install [OK]

Common Mistakes:

• Choosing IaaS or PaaS for software use
• Confusing DBaaS with SaaS
• Thinking SaaS requires software installation

4. A developer tries to deploy an app on a cloud platform but must manually install the operating system and runtime. Which cloud model is incorrectly used here?

medium

A. Platform as a Service (PaaS)

B. Infrastructure as a Service (IaaS)

C. Software as a Service (SaaS)

D. Network as a Service (NaaS)

Solution

1. Step 1: Understand PaaS expectations

   PaaS should handle OS and runtime installation automatically.

2. Step 2: Identify the error

   Manually installing OS means the platform is acting like IaaS, not PaaS.

3. Final Answer:

   Platform as a Service (PaaS) -> Option A

4. Quick Check:

   PaaS = no manual OS install [OK]

Hint: PaaS hides OS setup; manual means wrong model [OK]

Common Mistakes:

• Assuming manual install fits PaaS
• Confusing IaaS with PaaS
• Ignoring SaaS and NaaS differences

5. A startup wants to quickly launch a web app without managing servers but needs custom code and database control. Which cloud model should they choose and why?

hard

A. PaaS, because it lets them deploy code easily without server management.

B. IaaS, because it offers full control over servers and databases.

C. SaaS, because it provides ready-made apps with no coding needed.

D. On-premises, because cloud models don't allow custom code.

Solution

1. Step 1: Analyze startup needs

   They want no server management but need to run custom code and control databases.

2. Step 2: Match needs to cloud models

   IaaS requires server management, SaaS lacks custom code control, on-premises is not cloud.

3. Step 3: Confirm PaaS fit

   PaaS allows deploying custom code and managing databases without managing servers.

4. Final Answer:

   PaaS, because it lets them deploy code easily without server management. -> Option A

5. Quick Check:

   Custom code + no server management = PaaS [OK]

Hint: Custom code + no servers = PaaS [OK]

Common Mistakes:

• Choosing IaaS despite server management need
• Picking SaaS which lacks custom code control
• Thinking on-premises is cloud