Chapter 12 Serverless Compute

Question 1

Invocation Types in Lambda

Answer 1

1. RequestResponse - Synchronous execution
2. Event - Asynchronous execution
3. DryRun - test caller invokes, but not execute function

Question 2

What are the two requisite permission types for Lambda?

Answer 2

1. Execution permissions (adopted by Lambda)

2. Invocation permissions (adopted by user of Lambda)

Question 3

What are parameters given to Lambda fuction?

Answer 3

1. event (everything you need to execute Lambda)

2. context (data about Lambda itself)

Question 4

What are two configuration options for Lambda?

Answer 4

1. default network configuration

2. Amazon VPC (talk to privately deployed resources)

Question 5

What does X-ray do?

Answer 5

Collects data about requests your application serves

Question 6

How does x-ray work?

Answer 6

You use x-ray SDK in application, which sends data to x-ray daemon, which send to AWS X-ray

Question 7

default lambda timeout

Answer 7

3 seconds

Question 8

max lambda timeout

Answer 8

15 minutes

Question 9

max concurrent lambda functions

Answer 9

1,000

Question 10

What is a dead letter queue in context of Lambda?

Answer 10

It is queue of failed lambda invocations. Can be configured w/ SNS topic or SQS. Can also be set as a metric for Cloudwatch.

Question 11

What is best way to avoid using hardcoded sensitive data for lambda functions?

Answer 11

Use environmental variables

Question 12

Max memory allocation for Lambda?

Answer 12

3GB