Cloud Functions

Question 1

Cloud Functions - Definition

Answer 1

Serverless computing platform designed to run single-purpose pieces of code in response to events in GCP environments (PaaS)

Question 2

How are Cloud Functions managed? (3 key points)

Answer 2

1. functions execute in a secure isolated environment
2. since they each run in a separate instance, they don’t share memory, so they need to be stateless
3. multiple instances may be running at once.

Question 3

How long can a Cloud Function run?

Answer 3

default timeout is 1 min, but can be configured up to 9 min

Question 4

What languages do Cloud Functions support?

Answer 4

Node.js 8
Node.js 10
Python 3.7
Go 1.1

Question 5

Cloud Functions - key points (3)

Answer 5

1. managed independently from other services
2. short running code
3. fully managed - serverless

Question 6

How do cloud functions work?

Answer 6

Events have triggers which executes a function in response to the event.

Question 7

Examples of Cloud Function events (5)

Answer 7

1. HTTP Request
2. Cloud Storage event - adding, deleting, etc… a file
3. Cloud Pub/Sub event - publishing a message
4. Firebase - database trigger
5. Stackdriver logging

Question 8

Cloud Function functions - key points (3)

Answer 8

1. run in a separate instance every time they are invoked
2. no way to share data without using external service
3. the function is passed arguments about the event

Question 9

Cloud Functions use case examples (4)

Answer 9

1. webhooks - respond to an http request
2. image processing - validate or transform images
3. mobile back end - react to storage, authentication or data event
4. IOT - react to pub/sub from devices

Question 10

What needs to be filled in when creating a cloud function via the cloud console?

Answer 10

1. name
2. memory allocation - 128MB to 2GB
3. trigger
4. event type - depends on trigger
5. source of function code - editor , zip file , upload, etc…
6. runtime - node, python or go

Question 11

Create cloud function via shell - main command

Answer 11

gcloud functions deploy [NAME]

Question 12

Cloud function shell parameters (3)

Answer 12

• -trigger-resource or –trigger-topic

- -trigger-event

Question 13

Command to delete a cloud function via shell?

Answer 13

gcloud functions delete [NAME]