EC2

Question 1

What are the components of an EC2 archtecture?

Answer 1

• Elastic Compute Cloud
• IAAS
• Made up of:
  VM (EC2)
  Storing Data (EBS)
  Distributing load across machines (ELB)
  Scaling / auto-scaling (ASG)

Question 2

EC2 Sizing and Configurations

Answer 2

• OS / memory / storage / security / setup are all user configured (t2 Micro => m58 xlarge)

Question 3

What is the purpose of EC2 Security Groups ?

Answer 3

• Controls how traffic is allowed into and out of EC2 Instance
• Security groups only contain allow rules
• act as firewall regulating access to ports, IP ranges

Question 4

Classic Ports

Answer 4

SSH = 22
FTP = 21
SFTP = 22
HTTP = 80
HTTPS = 443
RDP 3389

Question 5

Connecting to EC2 by OS

Answer 5

Mac, Linux - SSH
Windows 7/8 - Putty
Windows 10 - SSH, Putty
EC2 Instance connect (web based) works on all for Amazon Linux

Question 6

Common Issues Connecting to EC2

Answer 6

• Linux - adding correct permissions to pem file (chmod 400
• Putty - not converting pem file to Putty format .ppk with puttygen
• incorrect username
  Amazon Linux : ec2-user@ipaddress
  Ubuntu AMI : ubuntu@ipaddress
  Debian AMI : admin@ipaddress
  Centos AMI: cents@ipaddress
• incorrect IP addres (can change with each restart)
• Port 22 on instance not authorized
• CPU usage is too high

Question 7

EC2 Instance Purchase Options

Answer 7

• On-demand instance. For short workload. Highest price. Most Flexible
• Reserved (min. 1 year -> 3 yrs) Large discount. 3yr is cheapest
  Reserved instance: long workload (like a db)
  Convertible Reserved: long workload with flexible instances (Instance type can be changed)
  Scheduled Reserve: For certain day/time
• Spot Instance: Deepest discount (90%). Short workloads on spot market. Must be able to save state if AWS shuts it down. Batch work resilient to failure
• Dedicated Host: (3 years, more expensive) AWS hardware dedicated to you. Use case is s/w cpu license, other compliance. Have access to h/w info
• Dedicated Instance - runs on hw dedicated to you, but may host other instances from same account. Don’t have access to h/w info

Question 8

What are the EC2 Hardware types?

Answer 8

• Different types for different use cases
• naming convention m5.exlarge
• types m: general purpose
• 5 generation
• T & M are general purpose
• C are compute optimized. Gaming, High performance computing
• ## R : for processing large datasets in memory, graphic processing