Compute (EC2)

Question 1

Name the 6 EC2 components?

Answer 1

1. AMIs
   (templates for virtual machines (EC2 instances)
2. EC2 Instance types
   (different hardware config)
3. EC2 Instance purchasing options
   (On-demand, reserved, spot)
4. EC2 Tenancy
   (shared / dedicated)
5. EC2 User data
   (custom data passed at launch)
6. EC2 Storage options
   (EBS volumes and instance store (ephemeral))

Question 2

Name 5 EC2 instance types

Answer 2

General purpose
Memory optimized
Storage optimized
Compute optimized
Accelerated computing

Question 3

Name 5 EC2 purchasing options

Answer 3

On-demand
Reserved
Scheduled
Spot
On-demand capacity reservations

Question 4

What are the two types of EC2 tenancy that exist?

Answer 4

Shared
Dedicated

Question 5

What are the 2 EC2 storage options?

Answer 5

Ephemeral storage
Elastic Block Storage

Question 6

Name the 2 types of EC2 security?

Answer 6

Security Groups
NACLs

Question 7

What do you need to do before you can create an Auto Scaling group?

Answer 7

you need to create a launch template with parameters (ie., AMI, ID and instance types)

then you can create an auto scaling group

Question 8

Which is the new way of autoscaling EC2 components

Answer 8

Using a launch template is the new way

The old way was launch config

Launch templates use autoscaling instead of instances

Question 9

Name 4 types of autoscaling policies

Answer 9

Manual
Dynamic (step and target)
Predictive
Scheduled

Question 10

You create a EBS volume on your EC2 instance to store and manage data.

What should you do next?

Answer 10

You should create a file system to organize and manage files and directories on the volume

Question 11

Describe the 4 steps to follow to create an EBS (Elastic Block Store) snapshot between AWS accounts?

Answer 11

2 AWS accounts: A is the source account and B is the destination account

1. A shares EBS snapshot with B (adds B to its snapshot permissions)
2. B accepts snapshot from A (copies EBS volume)
3. B creates an EBS volume (contains data from original snapshot)
4. EBS Volume attached and used by B

Question 12

When does EC2 Autoscaling check the health status of the instance?

Answer 12

After the grace period ends. The default grace period is 300 seconds (5mins)

Gives instances a chance to stabilze before the Auto Scaling group begins checking their health

Question 13

What does the cooldown period do when Auto Scaling?

Answer 13

The cooldown period is the waiting period between scaling activities

This prevents excessive or rapid scaling by allowing instances time to stabilize before further adjustments are made

Question 14

Does AWS have access to the OS of your app?

Answer 14

No

Question 15

Who is responsible for patching the system?

Answer 15

The customer is responsible for patching the system

Question 16

What is the default number of EC2 instances that you can launch?

Answer 16

Default number of instances you can launch is 20

Question 17

What happens if you try to create more EC2 instances than your account limit?

Answer 17

If you try to create more EC2 instances than your account limit, instance creation will fail and you will receive the error:

status=start_failed

Question 18

Name the required and optional parameters when creating a launch template

Answer 18

Required params:
Instance type

Optional params:
Instance ID
AMI
Key Pair
Security Groups
UserData
IAMRole
etc

Question 19

How would you back up multiple EBS volumes attached to an ec2 instance?

Answer 19

You would need to create a multi-volume snapshot (ie., create a snapshot for each of the EBS volumes attached to the ec2 instance)

To do this: choose “Instance” as the Resource Type in the Snapshot navigation pane

Question 20

When would you create a multi-volume snapshot instead of a snapshot?

Answer 20

A snapshot and multi-volume snapshot both create backups for EBS volumes

There is no separate action for a multi-volume snap

You just choose if you want to create a snapshot for a single EBS volume or multiple EBS volumes attached to the same EC2 instance

Question 21

Name 2 storage options for EC2 instances?

Answer 21

Instance Store (ephemeral)
EBS-Backed

Question 22

What do you pay for an EC2 instance in a hibernation state?

Answer 22

EBS Storage charges and Elastic IP address charges

You don’t pay for compute charges because it is in hibernation (not being used)

Question 23

Can Reserved Instance be queued to be purchased at a later date?

Answer 23

Yes

Can be queued for regional instance (can be used across multiple availability zones within the same AWS region)

(not zonal reserved instance or instance brought from other sellers)

Question 24

Examples of when u would use scheduled scaling

Answer 24

Everyone logs in a 9am so at 8.45 start scaling up