Create serverless applications | Create serverless logic with Azure Functions

Question 1

What is serverless compute?

Answer 1

You can think of it as Function As A Service (FaaS). You business logic runs as functions and you don’t have to manually provision or scale infrastructure.

Question 2

What is business logic in Software?

Answer 2

Represent real life business situation and rules in code. Like with the classes, objects and functions.

Question 3

What are the pro’s of serverless compute?

Answer 3

• any language
• auto scaling
• no servers to manage
• you are charged based on what is used - not on reserved time.
• event-driven

Question 4

What are the con’s of serverless compute?

Answer 4

• Execution time: your functions have limited execution time.
• Execution frequency: for continuous execution, serverless compute is probably not the right option. Can be expensive and not made for continuous.

Question 5

What are durable functions?

Answer 5

Durable Functions is an extension of Azure Functions that lets you write stateful functions in a serverless compute environment.

Question 6

The Consumption plan comes with a configurable timeout period for executing a function. By default, it’s ___ minutes, but may be configured to have a timeout as long as ___ minutes.

Answer 6

The Consumption plan comes with a configurable timeout period for executing a function. By default, it’s five (5) minutes, but may be configured to have a timeout as long as 10 minutes.

Question 7

How does Azure app service plan enable you to avoid timeout periods?

Answer 7

By having your function run continuously on a VM that you define.

Question 8

What is an HTTP trigger Authorization level?

Answer 8

An HTTP trigger Authorization level is a flag that indicates whether an incoming HTTP request needs an API key for authentication.

There are three Authorization levels:

• Function (key based)
• Anonymous
• Admin (key based)

Question 9

Which authorization keys can be used for key based HTTP trigger Authorization levels?

Answer 9

There are two types of keys: function and host.

• Function keys are specific to a function.
• Host keys apply to all functions inside the function app.

If your Authorization level is set to Function, you can use either a function or a host key. If your Authorization level is set to Admin, you must supply a host key.

Question 10

What does the anonymous authorization level mean?

Answer 10

No authentication required.

Question 11

What are block blobs?

Answer 11

Block blobs are the most common type. They allow you to store text or binary data efficiently.

Question 12

What are Append blobs?

Answer 12

Append blobs are like block blobs, but they’re designed more for append operations like creating a log file that’s being constantly updated.

Question 13

What are page blobs?

Answer 13

Page blobs are made up of pages and are designed for frequent random read and write operations.

Question 14

What is a blob trigger?

Answer 14

A blob trigger is a trigger that executes a function when a file is uploaded or updated in Azure Blob storage.

Question 15

What is the Path for a blob trigger?

Answer 15

The Path tells the blob trigger where to monitor to see if a blob is uploaded or updated.

Question 16

What is the default path for blob trigger?

Answer 16

samples-workitems/{name}
blob-container-name/triggered-files

samples-workitems represents the blob container that the trigger monitors.
{name} means that every type of file will cause the trigger to invoke the function.

Question 17

How to filter which kind of files trigger the blob trigger?

Answer 17

For example: samples-workitems/{name}.png

Question 18

What is a binding expression?

Answer 18

A binding expression is specialized text in function.json, function parameters, or code that is evaluated when the function is invoked to yield a value. For example, if you have a Service Bus Queue binding, you could use a binding expression to get the name of the queue from App Settings.

Question 19

What is the syntax for binding expressions?

Answer 19

Most expressions are identified by being wrapped in curly braces. However, app setting binding expressions are wrapped in percent signs rather than curly braces.

For example, if the blob output binding path is %Environment%/newblob.txt, and the Environment app setting value is Development, a blob will be created in the Development container.