Uploading and downloading objects in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an object in AWS S3?

An object in AWS S3 is a file stored in a bucket. It includes the data itself, metadata, and a unique identifier called a key.

beginner

How do you upload a file to an S3 bucket using the AWS Management Console?

You open the S3 bucket, click 'Upload', select the file from your computer, and then click 'Upload' to store it in the bucket.

beginner

What is the purpose of the 'key' when uploading an object to S3?

The key is the unique name that identifies the object within the bucket, like a filename in a folder.

intermediate

Name one method to download an object from S3 using the AWS CLI.

You can use the command 'aws s3 cp s3://bucket-name/object-key local-file-path' to download an object.

intermediate

What is a pre-signed URL in the context of S3 object downloads?

A pre-signed URL is a temporary link that allows anyone with the URL to download the object without needing AWS credentials.

Which AWS service is used to store and retrieve objects like files and images?

A Amazon Lambda

B Amazon EC2

C Amazon S3

D Amazon RDS

Amazon S3 is the service designed for object storage, ideal for files and images.

What does the 'key' represent when uploading an object to S3?

A The bucket name

B The size of the object

C The encryption method

D The unique name of the object in the bucket

The key is the unique identifier or name of the object inside the bucket.

Which AWS CLI command downloads an object from S3 to your local machine?

A aws s3 cp

B aws s3 ls

C aws s3 rm

D aws s3 mv

'aws s3 cp' copies files between S3 and your local system, used for downloads and uploads.

What is the main benefit of using a pre-signed URL for downloading an S3 object?

A It encrypts the object permanently

B It allows temporary access without AWS credentials

C It compresses the object automatically

D It deletes the object after download

Pre-signed URLs grant temporary access to objects without requiring AWS login.

Which of the following is NOT a valid way to upload an object to S3?

A Using Amazon EC2 to directly store files

B Using AWS Management Console

C Using AWS SDK in code

D Using AWS CLI command 'aws s3 cp'

Amazon EC2 is a compute service, not used directly for storing objects like S3.

Explain the steps to upload a file to an S3 bucket using the AWS CLI.

Think about the command format to copy files to S3.

Describe how a pre-signed URL works for downloading objects from S3 and why it is useful.

Consider how you might share a private file safely.