Serverless computing basics in Intro to Computing - Draw & Build Visually

Draw This - beginner

Draw a flowchart that shows how a simple serverless function works when a user uploads a photo to a website. Include these steps: user uploads photo, event triggers the serverless function, function processes the photo, and the processed photo is saved to storage.

10 minutes

Hint 1

Hint 2

Hint 3

Hint 4

Grading Criteria

Start and End oval symbols present

User upload step clearly shown

Event trigger step included

Serverless function processing step present

Processed photo saving step included

Flow direction is clear and logical

Solution

  _________          ___________          ______________          ________________          ____________
 |         |        |           |        |              |        |                |        |            |
 |  Start  | -----> | User      | -----> | Event        | -----> | Serverless     | -----> | Save       |
 |_________|        | uploads   |        | triggers     |        | function      |        | processed  |
                    | photo     |        | function     |        | processes    |        | photo      |
                    |___________|        |______________|        |______________|        |____________|
                                                                                                  |
                                                                                                  v
                                                                                             _________
                                                                                            |         |
                                                                                            |  End    |
                                                                                            |_________|

This flowchart starts with the Start symbol, representing the beginning of the process.

Next, the User uploads photo step shows the user action that triggers the process.

The Event triggers function step represents the serverless platform detecting the upload and starting the function automatically.

The Serverless function processes step shows the function doing its work, like resizing or optimizing the photo.

Then, the Save processed photo step saves the result to storage.

Finally, the End symbol marks the completion of the process.

This flowchart helps visualize how serverless computing runs code only when needed, without managing servers.

Variations - 2 Challenges

[intermediate] Draw a flowchart for a serverless function that sends a welcome email when a new user registers on a website. Include user registration, event trigger, function execution, and email sending.

[advanced] Draw a detailed flowchart for a serverless function that processes an online order: user places order, event triggers function, function checks inventory, processes payment, updates order status, and sends confirmation email.

Practice

1. What is the main advantage of serverless computing compared to traditional server management?

easy

A. You don't have to manage or maintain servers yourself.

B. You get unlimited free server usage.

C. You must buy physical servers for your code.

D. You need to install software on each server manually.

Solution

1. Step 1: Understand serverless computing basics

   Serverless computing means the cloud provider manages the servers, so you don't have to.

2. Step 2: Compare with traditional server management

   Traditional requires you to set up and maintain servers; serverless removes this burden.

3. Final Answer:

   You don't have to manage or maintain servers yourself. -> Option A

4. Quick Check:

   Serverless = No server management [OK]

Hint: Serverless means no server setup needed [OK]

Common Mistakes:

• Thinking serverless means free unlimited usage
• Confusing serverless with owning physical servers
• Assuming manual software installation is needed

2. Which of the following is the correct way to describe serverless computing?

easy

A. You run code on your own physical servers.

B. You pay only when your code runs, not for idle time.

C. You must configure the server's operating system manually.

D. You need to buy and maintain server hardware.

Solution

1. Step 1: Identify payment model in serverless

   Serverless charges you only when your code executes, not for idle server time.

2. Step 2: Eliminate incorrect options

   Options A, C, and D describe traditional server management, not serverless.

3. Final Answer:

   You pay only when your code runs, not for idle time. -> Option B

4. Quick Check:

   Serverless payment = pay per execution [OK]

Hint: Serverless billing is based on code execution time [OK]

Common Mistakes:

• Assuming you pay for server uptime even if code is idle
• Confusing serverless with owning physical servers
• Thinking manual OS setup is required

3. Consider this scenario: A serverless function is triggered by a user uploading a photo. What happens immediately after the upload?

medium

A. The serverless function runs automatically to process the photo.

B. The user must manually start the serverless function.

C. The serverless function waits until the server is manually started.

D. The photo upload fails because serverless can't handle files.

Solution

1. Step 1: Understand event-driven nature of serverless

   Serverless functions run automatically when triggered by events like file uploads.

2. Step 2: Analyze the scenario

   Uploading a photo triggers the function immediately without manual intervention.

3. Final Answer:

   The serverless function runs automatically to process the photo. -> Option A

4. Quick Check:

   Serverless = automatic event response [OK]

Hint: Serverless runs code automatically on events [OK]

Common Mistakes:

• Thinking user must start the function manually
• Assuming serverless can't handle file uploads
• Believing server must be manually started first

4. A developer wrote this serverless function code but it never runs when triggered. What is the most likely error?

medium

A. The serverless platform requires manual server start.

B. The function code has a syntax error.

C. The function is not linked to the event trigger.

D. The function runs only on physical servers.

Solution

1. Step 1: Check event trigger linkage

   Serverless functions must be connected to events to run automatically.

2. Step 2: Evaluate other options

   Syntax errors cause failures but usually error messages; manual server start is not needed; serverless does not run only on physical servers.

3. Final Answer:

   The function is not linked to the event trigger. -> Option C

4. Quick Check:

   Missing trigger linkage = no function run [OK]

Hint: Check event trigger connection if function doesn't run [OK]

Common Mistakes:

• Assuming manual server start is needed
• Ignoring event trigger setup
• Confusing serverless with physical server requirements

5. You want to build a photo-sharing app that automatically resizes images when users upload them. Which serverless feature best fits this need?

hard

A. Using physical servers to store photos only.

B. Manually starting servers to process images.

C. Paying for server uptime regardless of uploads.

D. Event-driven functions that run on each photo upload.

Solution

1. Step 1: Identify app requirement

   The app needs automatic image resizing triggered by uploads.

2. Step 2: Match with serverless features

   Event-driven functions run automatically on upload events, perfect for this task.

3. Step 3: Eliminate other options

   Manual server start and paying for uptime are not serverless advantages; physical servers only store, not process.

4. Final Answer:

   Event-driven functions that run on each photo upload. -> Option D

5. Quick Check:

   Event-driven serverless = automatic processing [OK]

Hint: Use event-driven functions for automatic tasks [OK]

Common Mistakes:

• Choosing manual server management
• Ignoring pay-per-use benefits
• Confusing storage with processing