Deck 2

Question 1

S3 durability

Answer 1

99,999999999%

Question 2

AWS storage gateway types

Answer 2

• Gateway-cached volumes: Store primary data and cache most
  recently used data locally
• Gateway-stored volumes: store entire dataset on site and
  asynchronously replicate data back to S3
• Gateway-virtual tape library: Store your virtual tapes in either S3 or
  Glazier.

Question 3

Are you charged for EIPs?

Answer 3

• Used: free

- Instance stopped: charges

Question 4

Is it possible to tag an EIP?

Answer 4

No

Question 5

Services with automated backup

Answer 5

• RDS
• Elasticache (REDIS)
• Redshift

Question 6

Services without automated backup

Answer 6

EC2

Question 7

What happens with backups when you delete a RDS instance?

Answer 7

• Automated: erased

- Manual: preserved

Question 8

Where are all backups (RDS, ElastiCache, Redshift, EC2) stored?

Answer 8

S3

Question 9

Things to have in account with ElastiCache backups?

Answer 9

• For Redis only
• Entore cluster snapshotted
• Degrades performance
• Set up during least busy part of day

Question 10

Elasticache Memcached. Is it possible to backup cluster?

Answer 10

No

Question 11

Is it possible to have automated backups in EC2?

Answer 11

You can create your own automated backups by:

• Using command line
• Using Python scripts

Question 12

Main diference between instance store and EBS

Answer 12

• Instance Store (ephemeral): non persistent

- EBS: persistent

Question 13

Types of volumes

Answer 13

• Root volume: where OS is installed

* Additional volumes: other volumes (data)

Question 14

Is it possible to stop an instance store instance?

Answer 14

No, only reboot or terminate

Question 15

When is suitable to use ephemeral disks?

Answer 15

• Temporary storage (buffers, caches, etc)

- When data is replicated

Question 16

Strategies to keep data safe

Answer 16

• Store in S3

- Using EBS volumes

Question 17

Is it possible to disable “delete on termination” on EBS root volumes?

Answer 17

Only during instance creation

Question 18

Which have a faster boot, instance store or EBS?

Answer 18

EBS is faster because when booting from instance store, the data is downloaded from S3 to the local disk.

Question 19

Is it possible to attach an EBS to an instance in a different AZ?

Answer 19

No

Question 20

Is it possible to attach an EBS to more than 1 instance?

Answer 20

No

Question 21

Charges related with EBS-backed instance

Answer 21

• Instance usage
• EBS volume usage
• Storing AMI as EBS snapshot

Question 22

Charges related with instance store-backed instance

Answer 22

• Instance usage

- Storing AMI as EBS snapshot

Question 23

EBS volume size limit

Answer 23

16 TB

Question 24

Instance store volume size limit

Answer 24

10 GB

Question 25

Elements for a tiered backup solution

Answer 25

S3

Glacier

Question 26

S3 max object size

Answer 26

5 TB

Question 27

When you should use S3 multipath upload?

Answer 27

• Recommended if file is greater than 100MB
• Compulsory if is
  greater than 5GB

Question 28

Where to store logs?

Answer 28

• Using 3rd party centralized monitoring platform (logs can be stored in S3)
• Using Cloudwatch logs (Instances need permission to push logs to CWL)
• Using Access logging on S3 (S3 only)

Question 29

What is OpsWorks?

Answer 29

Application management service that helps you automate operational tasks like:
• Code Deployment
• Package installations
• Server scaling
• Software configurations
• Database setups

Question 30

OpsWorks main elements

Answer 30

• Stack: Container (or group) of resources (ELB,RDS,EC2,etc)

* Layer: Exists within a stack. Consists in applayer, DBlayer,etc.