Elastic Compute Cloud(EC2)

Question 1

What does Elastic mean in EC2?

Answer 1

This means that resources can grow or shrink based on the needs/load on the application

Question 2

What is an EC2 instance?

Answer 2

A web service with which you can run vritua servcer “Instances” in the cloud

Question 3

What are the methods to access an EC2 instance?

Answer 3

1. AWS Management Console
2. EC2 Instance Connect(EIC)
3. Secure Shell(SSH)
4. AWS Systems Manager

Question 4

What is the AWS Management Console?

Answer 4

Configure and manage instance via a web browser

Question 5

What is the EC2 Instance Connect(EIC)?

Answer 5

EIC allows for the use of IAM policies to control SSH access to your instances

Question 6

In what way does EIC impact SSH?

Answer 6

Removes the need to manage SSH

Question 7

What are the key items to know about SSH?

Answer 7

• Allows you to establish a secure connection to your instance from your local laptop
• This tends to be the most popular

Question 8

How to configure SSH on the EC2 instance?

Answer 8

Generate a Key Pair and place them on the EC2 Instance

Question 9

What are the different prcing options for EC2?

Answer 9

1. On-Demand
2. Spot
3. Reserve Instance
4. Dedicated Hosts
5. Savings Plan

Question 10

What is the On-Demand Pricing Option?

Answer 10

A fixed price in which you are billed down to the second based on the instance type

Question 11

When would you use an On-Demand Pricing Option?

Answer 11

• Cost is not your highest concern
• Your application has unpredictable workloads that can’t be interrupted
• Your applications are under development
• Your workloads will not run longer than a year

Question 12

What is reserve capacity for On-demand?

Answer 12

EC2 capacity is held for you whether or not you run the instance

Question 13

What is the Spot Option?

Answer 13

• You pay the spot price that’s in effect at the beginning of each hour
• Requests are only fulfilled when capacity is available

Question 14

When should a spot instance be used?

Answer 14

• You are not concerned about the start or stop time of your application
• Your workloads can be interrupted
• Your application is only feasible at a very low compute price
• Users with an urgent need for a large amount of additioanl compute capacity

Question 15

What is Reserve Instances Pricing Option?

Answer 15

allow you to commit to a specific instance type in a particular Region for 1 or 3 years

Question 16

When would you use an Rls?

Answer 16

• Your application has a steady-state usage, and you can commit to 1 or 3 years
• You can pay money upfront in order to receive a discount on On-Demand prices
• Your application requires a capacity reservation

Question 17

Do you need to sign a contract for a reserved instance ?

Answer 17

You are required to sign a contract

Question 18

What is a Dedicated Hosts pricing plan?

Answer 18

Allow you to pay for physical server that is fully dedicated to running your instance

Question 19

When would you use a dedicated host?

Answer 19

• You want to bring your own server bound software license from vendors like Microsoft or Oracle
• You have regulatory or corporate compliance requirements around the tenancy model

Question 20

What are some fun facts about Dedicated Hosts?

Answer 20

• You can save up to 70% off On-Demand prices
• You bring your existing per-socket, per-core, or per-VM software licenses
• There is no multi-tenancy, meaning their server is not shared with other customers
• A Dedicated Host is a physical server, whereas a Dedicated Instance run on the host

Question 21

What is a saving pricing plan?

Answer 21

Allows you to commit to compute usage (measured per hour) for 1 to 3 years

Question 22

When should you use a Savings Plans?

Answer 22

• You want to lower your bull across multiple compute services
• You want the flexibility to change compute service, instance types, operating systems, or regions

Question 23

What are some fun facts about Savings Plans?

Answer 23

• You can save up to 72% off On-Demand Prices
• You are not making a commitment to a dedicated Host, just compute usage
• Savings can be shared across various computing services like EC2, Fargate, and Lambda
• This does not provide a capacity reservation

Question 24

What does AMI stand for?

Answer 24

Anmazon Machine Image

Question 25

What is an AMI ?

Answer 25

Is a special type of virtual applicate that is used to create a vritual machine within the Amazon EC2 Instance

Question 26

What is included in an AMI instance?

Answer 26

1. One or more Amazon Elastic Block Store snapshots, or for instance-store-backed AMIs, a template for the root volume of the instance(For Example, an operating system, an application server and applications)
2. Launch Permissions that control which AWS accounts can use the AMI to laucnh instances
3. A block device mapping that specifies the volume to attach to the instance when it’s launched

Question 27

What are the 3 categories that AMI come in?

Answer 27

1. Community AMI
2. AWS Marketplace AMI
3. My AMis

Question 28

What is an Community AMI?

Answer 28

Free to use, generally you just select the operating you want

Question 29

What is an AMI Marketplace AMI?

Answer 29

Pay to use, generally come packaged with addtional licensed software

Question 30

What is “My AMI” ?

Answer 30

AMIs that you have created yourself

Question 31

What are the 3 ways to pay for a reserve instance ?

Answer 31

• All Upfront
• Partial Upfront
• No Upfront

Question 32

How much can switching to a RIs pricing option save you over on-demand prices?

Answer 32

You can save up to 75% off On-Demand prices