AWS CLI

Question 1

Paginating results from S3/Dynamo. you want to show100 results per page to your users and minimize the number of API calls that you will use.

max-items
starting-token

page-size

Answer 1

To paginate results, you would use max-items with starting-token. This will return PAGES of data including the next token to use.

Page-Size Is about how many API calls AWS will make to pull data. It defaults to 1,000. (So to read 3500 rows, it would make 4 API calls). You might use this to reduce the amount of data read in one go if you are getting timeout errors.

Question 2

using CLI, how do you filter attributes that get returned by dynamo?

Answer 2

–projection-expression

By default, all attrivutes will be returned. To reduce cost and traffic, you can specify which attributes with Projection Expression.

aws dynamodb scan –table-name UserPosts –projection-expression “user_id, content”

Question 3

using CLI, how do you filter the ITEMS (rows) before they are returned to you ?

Answer 3

Using filter-expression and expression-attribute-values

aws dynamodb scan –table-name UserPosts –filter-expression “user_id = :u” –expression-attribute-values ‘{ “:u”: {“S”:”john123”}}’

Question 4

how to assume new role with aws CLI

Answer 4

aws sts assume-role –role-arn

Question 5

aws SQS commands with CLI

Answer 5

aws sqs list-queues
aws sqs send-message –queue-url https://sqs.eu-west-2.amazonaws.com/8681…. –message-body “Hello Steve”
aws sqs receive-message –queue-url https://sqs.eu-west-2.amazonaws.com/8681
aws sqs delete-message –queue-url xxxxxx –receipt-handle yyyyyy

Question 6

Get details of current user with aws cli

Answer 6

aws sts get-caller-identity –profile besa (profile ovrrides default and picks other user)

Question 7

M

Question 8

make lambda call with aws cli both sync and async

Answer 8

aws lambda invoke –function-name demo-lambda-python –cli-binary-format raw-in-base64-out –payload ‘{“key1”: “lilly”, “key2”: “olivia”, “key3”:”jack”}’ response.json

Asycn Call
aws lambda invoke –function-name demo-lambda-python –cli-binary-format raw-in-base64-out –payload ‘{“key1”: “lilly”, “key2”: “olivia”, “key3”:”jack”}’ –invocation-type Event response.json

Question 9

how to monitor EC2 instance(s) using aws cli

Answer 9

aws ec2 monitor-instances –instance-ids i-1234567890abcdef0 - MOnitor ec2 instance(s)