> For the complete documentation index, see [llms.txt](https://gyansetu-aws.gitbook.io/aws-cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gyansetu-aws.gitbook.io/aws-cloud/amazon-elastic-compute-cloud-amazon-ec2.md).

# Amazon Elastic Compute Cloud (Amazon EC2)

1. Amazon Elastic Compute Cloud (Amazon EC2) provides scalable computing capacity in the Amazon Web Services (AWS) cloud. 
2. Amazon EC2 eliminates your need to invest in hardware up front, so you can develop and deploy applications faster 
3. Amazon EC2 enables you to scale up or down to handle changes in requirements or spikes in popularity, reducing your need to forecast traffic.

####  Features of Amazon EC2 

* Virtual computing environments, known as instances
*  Various configurations of CPU, memory, storage, and networking capacity for your instances, known as instance types.
*  Secure login information for your instances using key pairs (AWS stores the public key, and you store the private key in a secure place) (

#### create an ec2 instance and explain about instance family) EC2 on demand 

1.  General purpose. 
2.  Compute optimized Compute intensive application. 
3.  Memory optimized Database and memory caching application.
4.   Storage optimized Data warehousing and parallel computing

**. EC2 Options**

1. On-Demand instances Pay for the instances that you use by the hour, with no long-term commitments or up-front payments.
2.  Reserved Instances Make a low, one-time, up-front payment for an instance, reserve it for a one- or three-year term, and pay a significantly lower hourly rate for these instances.
3.  Spot instances Bid on unused instances, which can run as long as they are available and your bid is above the Spot price, at a significant discount.
4.  Dedicated hosts Pay for a physical host that is fully dedicated to running your instances, and bring your existing per-socket, percore, or per-VM software licenses to reduce costs. 

#### On demand vs Reserved vs Spot Instances 

On demand 

1. Users that want the low cost and flexibility of Amazon EC2 without any upfront payment or long term commitment. 
2. Application with short term, spiky, or unpredictable workloads that cannot be interrupted. 
3.  Application which is developed or tested on Amazon EC2 for the first time. (note: Pay per hour) 

Reserved 

1.  Application with steady state or predictable usage Eg; web servers running in an instance 
2.  Application that require specific capacity
3.   Users are able to make upfront payment to reduce the total computing cost. 

**Spot** 

1.  Application that has flexible start and end time.
2.  Application that are feasible at very low compute prices.
3.   Users with urgent computing needs for large amount of additional capacity 

**Dedicated Host** 

1.   . An Amazon EC2 Dedicated Host is a physical server with EC2 instance capacity fully dedicated to your use.
2.    Dedicated Hosts allow you to use your existing per-socket, per-core, or per-VM software licenses, including Windows Server, Microsoft SQLServer, SUSE and Linux Enterprise Server.

 

> (create a windows instance -> go to connect option -> download the remote desktop file -> get password -> choose key pair -> get the password -> open remote desktop -> enter the password)