S3 Flashcards
What does S3 stand for?
Simple storage service
What is AWS S3?
A secure, durable, highly scalable object storage
What file types can be uploaded to S3?
Any file type
When should you use S3 to run operating systems or database?
Never, s3 cannot be used for ^
How much storage do you get with S3?
Unlimited storage
What is the maximum storage size for an object?
5Tb
Where do files in S3 get stored?
A bucket
What is a bucket analogous to?
A folder
What does it mean that S3 has a universal namespace?
That all AWS accounts share the S3 namespace. Each S3 bucket name is globally unique
How are S3 URL’s formatted?
Bucketname.s3.region.Amazonaws.com/key-name
How do you know a file upload to an S3 bucket was successful?
You receive a HTTP 200 code
Is S3 a key value store?
Yes
What is the key in S3 objects?
The name of the object
What is the value in an S3 object?
The data itself
What is the metadata of a S3 object?
Data about the data you are storing
What is necessary for every object in S3?
A key, a value, a version ID, and metadata
What is the service availability range of S3?
99.95 to 99.99 percent, depending on S3 tier
What is the durability of data stored in S3?
99.999999999 percent (11 nines)
What is the minimum amount of availability zones S3 data is stored across?
3
What is lifecycle management?
Define rules to automatically transition objects to a cheaper storage tier or delete objects that are no longer required after a set period of time
Why doesn’t S3 have strong read after write consistency?
It does have strong read after write consistency
What is the scope of Object ACL’s?
Individual objects
What is the scope of bucket policies?
Entire buckets
Are buckets public by default?
No, private
How can you make an individual object public?
By using object ACL’s
How do you make a bucket public?
Bucket policies
When you successfully upload an object to S3, what code do you receive?
A HTTP 200
What type of websites cannot be hosted on S3?
Dynamic websites, only static can be hosted
Does S3 scale automatically?
Yes
What is versioning in S3?
Having multiple versions of an object
What are the advantages of versioning in S3?
- All versions of an object are stored in S3
- Can be a great backup tool
- Cannot be disabled once enabled, only suspended
- Can be integrated with lifecycle rules
- Supports MFA
What are the tiers of S3?
S3 Standard
S3 Standard Infrequent Access
S3 One Zone Infrequent Access
S3 Intelligent Tiering
S3 Glacier Options
What is S3 Standard designed for?
Perfect for frequently accessed data
What is the default storage class?
S3 standard
What is S3 Standard IA used for?
Used for data that is accessed less frequently but requires rapid access when needed
What is the difference between S3 one zone IA and S3 IA?
S3 IA is stored across multiple availability zones while S3 one zone IA is not.
How much cheaper is S3 One zone IA than S3 IA?
20 percent cheaper
What does S3 intelligent tiering do?
Automatically move your data to most cost effective tier based on how frequently you access each object
How much does intelligent tiering cost?
.0025 cents per 1000 objects
What is S3 glacier used for?
Very infrequently accessed data
What are the S3 glacier options?
Glacier instant retrieval, Glacier flexible retrieval, Glacier deep archive
What is the cheapest storage class?
S3 Glacier deep archive
What is Lifecycle Management in regards to S3?
Automates the moving of your objects between the different storage tiers, thereby maximizing cost effectiveness
What is WORM model?
Write once read many model
What is S3 object lock?
A service that allows you to store objects using the WORM model. This helps prevent objects from being deleted or modified
How long does S3 object lock last?
A set period of time or indefinitely
What is governance mode in S3 object lock?
Protects objects against being deleted by most users but you can still grant some users permission to overwrite or delete an object version or alter its lock settings.
What are the two modes of S3 object lock?
Governance and compliance
What is compliance mode in s3 object lock?
It makes an object unable to be overwritten or deleted by any user, including the root user
What is a retention period in regard to s3 object locks?
A retention period WORM protects an object version for a fixed amount of time
What is a legal hold in regards to S3 object locks?
It WORM protects an object indefinitely until the legal hold is removed
What is the difference between a retention period and a legal hold?
A legal hold is indefinitely placed while a retention period has a set amount of time
What does Glacier Vault Lock allow?
Easy deployment and enforcement of compliance controls for individual S3 glacier vaults with a vault lock policy
What is the scope of S3 object lock?
It can be applied to individual objects or buckets
What encryption types are offered for S3 objects?
1.Encryption in transit
2.Encryption at Rest: Server side Encryption
3. Encryption at Rest: Client side encryption
What are the 2 ways of enforcing server side encryption?
Through the console or a bucket policy
If the file is to be encrypted at upload time, what parameter is included in the request header?
X-amz-server-side-encryption
What are the 2 options for encrypting S3 objects server side?
SSE-S3: this is S3 managed keys
SSE-KMS: this is KMS managed keys
What does the parameter for a server side encryption S3 managed keys look like?
X-amz-server-side-encryption: AES256
What are S3 prefixes?
The folder paths towards an object in a S3 bucket
What correlation exists between S3 performance times and the how many prefixes a bucket has?
A positive correlation, the more prefixes, the better performance times
What is the big downside of KMS encryption?
There is a KMS quota that cannot be increased.
What kind of upload is required for files over 5GB?
A multipart upload
What does multipart upload do?
It parrallelizes uploads by taking a large file, splitting it into smaller files and uploading those simultaneously
What is the advantages of S3 byte range fetches?
1.It parallelizes downloads
2. If there is a failure in the download, it only effects a small portion
What is the purpose of S3 replication?
To replicate objects from one bucket to another
What setting is required for S3 replication to happen?
Versioning must be enabled
What is not automatically replicated by S3 replication?
1.Objects that pre-existed the replication
2. Delete markers
Are s3 buckets private by default?
Yes
Can a lifecycle policy move an object from a less frequently accessed storage tier to a more frequently accessed storage tier?
No, only from a more frequently accessed storage tier to a less frequently accessed storage tier
What is the difference between availability and durability?
Availability is the ability to access data and durability is the ability to store data
