EC2 Basics

Question 1

Amazon EC2

Answer 1

Elastic Compute Cloud

This is the way to do Infrastructure as a Service

Question 2

What does EC2 consist of?

Answer 2

• Renting virtual machines (EC2)
• Storing data on virtual drives (EBS)
• Distributing load across machines (ELB)
• Scaling the services using an auto-scaling group (ASG)

Question 3

EC2 sizing & configuration options

Answer 3

• Operating System: Linux, Windows or Mac

How much of the following you want:
- Compute power & cores (CPU)

• Random-access memory (RAM)
• Storage space:
  Network-attached (EBS & EFS)
  Hardware (EC2 Instance Store)
• Network card: speed of the card, Public IP address
• Firewall rules: security group
• Bootstrap script (configure at first launch): EC2 User Data

Question 4

Bootstrapping

Answer 4

Launching commands when a machine starts

That script only run once at the instance first start

Question 5

EC2 user data is used to automate boot tasks such as

Answer 5

• Installing updates
• Installing software
• Downloading common files from the internet
• Anything you can think of

The more you add into the user data script the more the instance has to do at boot time

Question 6

Does the EC2 User Data Script runs with the root user?

Answer 6

Yes, any command you have will have the sudo rights

Question 7

EC2 instance types

Answer 7

Instance | vCPU | Mem | Stge | Network Perf | EBS
t2.micro | 1 | 1 | EBS-Only| Low to Mod |

t2.xlarge | 4 | 16 | EBS-Only| Moderate |

c5d.4xlarge |16|32|1x400 NVMe SSD|Up to 10 Gb
| 4,750

r5.16xlarge | 64 | 512 | EBS-Only| 20 Gb | 13,600

m5.8xlarge | 32 | 128 | EBS-Only| 10 Gb | 6,800

** t2.micro is part of the AWS free tier (up to 750 hours per month) **