EC2 Fundamentals

Question 1

Spot Instances

Answer 1

Spot Instances are good for short workloads and are the cheapest EC2 Purchasing Options, but the least reliable. Provide the biggest discount but are not suitable for critical jobs.

Question 2

Security Groups

Answer 2

Control traffic in and out of EC2 instances. can be attached to multiple EC2 instances.

Question 3

EC2 Reserved Instances

Answer 3

• Up to 72% discount compared to On-demand
• You reserve a specific instance attributes (Instance Type, Region,Tenancy, OS)
• Reservation Period – 1 year (+discount) or 3 years (+++discount)
• Payment Options – No Upfront (+), Par tial Upfront (++), All Upfront (+++) * Reserved Instance’s Scope – Regional or Zonal (reserve capacity in an AZ)
• Recommended for steady-state usage applications (think database)
• You can buy and sell in the Reserved Instance Marketplace

Question 4

Convertible Reserved instance

Answer 4

• Convertible Reserved Instance
• Can change the EC2 instance type, instance family, OS, scope and tenancy * Up to 66% discount

Question 5

Compute Optimized Instance

Answer 5

• Great for compute-intensive tasks that require high performance processors:
• Batch processing workloads
• Media transcoding
• High performance web servers
• High performance computing (HPC)
• Scientific modeling & machine learning
• Dedicated gaming servers

Question 6

EC2 User Data

Answer 6

is used to bootstrap your EC2 instances using a bash script. The script can contain commands such as installing software/packages, download files from the internet or anything you want.

Question 7

Memory Optimized Instance

Answer 7

Fast performance for workloads that process large data sets in memory
* Use cases:
* High performance, relational/non-relational databases
* Distributed web scale cache stores
* In-memory databases optimized for BI (business intelligence)
* Applications performing real-time processing of big unstructured data

Question 8

Storage Optimized Instance

Answer 8

Great for storage-intensive tasks that require high, sequential read and write access to large data sets on local storage
* Use cases:
* High frequency online transaction processing (OLTP) systems
* Relational & NoSQL databases
* Cache for in-memory databases (for example, Redis)
* Data warehousing applications
* Distributed file systems

Question 9

Dedicated Host Instances

Answer 9

A physical server with EC2 instance capacity fully dedicated to your use
* Allows you address compliance requirements and use your existing server- bound software licenses (per-socket, per-core, pe—VM software licenses)
* Purchasing Options:
* On-demand – pay per second for active Dedicated Host
* Reserved - 1 or 3 years (No Upfront, Partial Upfront,All Upfront)
* The most expensive option
* Useful for software that have complicated licensing model (BYOL – Bring Your
Own License)
* Or for companies that have strong regulatory or compliance needs

Question 10

Spot Fleet

Answer 10

Set of spot instances and optionally on-demand instances. it allows you to automatically request spot instances with the lowest price.