EC2 Flashcards
What does EC2 stand for, and what does it mean?
EC2 stands for Elastic Cloud Computing and it’s basically a virtual server in the cloud
What are the 4 types of pricing models in EC2?
On-Demand
Reserved
Spot
Dedicated Hosts
What’s the purpose of on-demand EC2?
Allows you to pay hourly or by the second without any commitments
What’s the purpose of Reserved EC2?
It reserves (blocks) a server capacity that offers you a high discount, although you do need to sign a contract from 1 year up to 2 years
What’s the Spot Ec2 pricing?
It’s an instance that you bid on the price.
What are the downsides of EC2 spot pricing?
Amazon can terminate the instance whenever it feels necessary but you will not be charged by the partial hour of usage
What’s the occasion when an EC2 Spot is terminated that the client needs to pay for any partial hourly usage?
When the client itself terminate an instance
What are Dedicated-Server hosts?
Physical EC2 instances dedicated for your usage (isolated at hardware level). It can help you remove costs by allowing you to use your own software licenses.
To whom it’s recommended the Spot Pricing model of EC2?
- Applications that are feasible with low compute needs
- Applications that have flexible end-start times
- Users with very urgent compute needs
To whom it’s recommended the Dedicated Pricing model of EC2?
- Regulatory requirements that don’t allow multi-tenancy virtualization
- Great for licensing which doesn’t support multi-tenancy or cloud deployments.
- Can be purchased on-demand (hourly)
- Can be purchased as a reservation for up to 70% of the price
What is Amazon EBS?
EBS stands for Elastic Block Storage and it’s basically a virtual disk on the cloud
How EBS interact with EC2?
EBS creates virtual disks that can be attached to EC2 instances. Once attached you can create a file system, run a database, etc…
What are the types of EBS?
SSD and Magnetic
What are the two types of SSD EBS?
General Purpose SSD (GP2)
Provisioned IPOS SSD (IO1)
What’s the purpose of the General Purpose SSD in EBS?
Balances price and performance for a wide variety of workloads.
What is the purpose of the Provisioned IPOS SSD in EBS?
Highest performance SSD for mission-critical/low-latency or high-throughput workloads
What are the three types of Magnetic EBS?
Throughput Optimized (ST1) Cold HDD (SC1) Magnetic (Previous generation)
What’s the purpose of Throughput Optimized (ST1) Magnetic EBS?
Low-cost HDD volume designed for frequently accessed throughput intensive workloads
What’s the purpose of Cold HDD (SC1) Magnetic EBS?
lowest cost HDD volume designed for less frequently accessed data (file servers)
What are the three types of Reserved Pricing Types?
- Standard Reserved Instance
- Convertible Reserved Instance
- Scheduled Reserved Instance
What are the two types of security networks for your EC2 instances?
Security Groups
VPC ACL
What are security groups?
Individuals firewalls for your instances. It defines what goes in and out of your instances
What are VPC ACL?
Individuals firewalls for your network (subnets). You control what goes in and out of your network
