EC2 Virtual Machines - storage - load balancing

Question 1

What is Amazon EC2?

Answer 1

Amazon Elastic Compute Cloud (Amazon EC2) provides scalable computing capacity in the Amazon Web Services (AWS) Cloud.

• EC2 is one of the most popular of AWS’ offering
• EC2 = Elastic Compute Cloud = Infrastructure as a Service
• It mainly consists in the capability of :
  - Renting virtual machines (EC2)
  - Storing data on virtual drives (EBS)
  - Distributing load across machines (ELB)
  - Scaling the services using an auto-scaling group (ASG)
• Knowing EC2 is fundamental to understand how the Cloud works

Question 2

Bootstrap script

Answer 2

Is configure at first launch: EC2 User Data

Question 3

On-demand EC2

Answer 3

• Low cost, no upfront payments(commitments)
• Use for workloads that cannot be predicted or interrupted
• Developing applications
• Workload will not run longer than a year
• High availability
• Disaster recovery
• Coming and staying in resort whenever we like, we pay the full price

Question 4

Spot instances EC2

Answer 4

• Cheapest option
• Takes advantages of unused EC2 instances
• Not concerned with start or stop times
• Workload is interrupted
• the hotel allows people to bid for the empty rooms and the highest bidder keeps the rooms. You can get kicked out at any time

Question 5

Dedicated Hosts EC2

Answer 5

• Dedicated servers that are reserved to run only your instances
• You can bring your own server licenses
• Company compliance requirement during tenancy

Question 6

Dedicated Host vs Dedicated Instance

Answer 6

Dedicated Hosts = Dedicated Server
Dedicated Instances RUNS on dedicated Hosts

Question 7

Reserved Instances EC2

Answer 7

• Specify instance for 1-3 years
• Can pay upfront
  - Choice to pay or not, if pay upfront get a bigger
  discount
• Your application requires a capacity application
• like planning ahead and if we plan to stay for a long time, we may get a good discount.

Question 8

Savings plan EC2

Answer 8

• Commit compute usage 1-3 years
• Lower bill across multiple services
• Flexibility to change compute services, instance types, OSs or regions
• pay a certain amount per hour for certain period and stay in any room type (e.g., King, Suite, Sea View, …)

Question 9

Capacity Reservations

Answer 9

you book a room for a period with full price even you don’t stay in it

Question 10

Classic EC2 Load Balancing

Answer 10

• EC2 classic network
• Layer 4/7

Question 11

Gateway EC2 Load Balancing

Answer 11

• Use for network logging and monitoring with a 3rd-party virtual appliance
• Layer 3/4

Question 12

Application EC2 Load Balancing

Answer 12

• Flexible application management
• Layer 7
• HTTP + HTTPS

Question 13

Network EC2 Load Balancing

Answer 13

• Extreme performance and static IP address
• Layer 4
• TCP + UDP + TLs protocols and static IPs

Question 14

Connect to a EC2 instance (not linux)

Answer 14

• Management console
• Instance Connect
• SSH
• RDP
• System Manager

Question 15

Connect to a Linux EC2 instance

Answer 15

• SSH
• AWS Systems Manager Session Manager
• AWS CLI

Question 16

You have been tasked with improving the availability of your application and curb costs when peak hours subside. What can you implement to accomplish this?

Answer 16

Auto Scaling