Amazon Elastic Compute Cloud (Amazon EC2) is a web
service that provides resizable compute capacity in the cloud. It is
designed to make web-scale computing easier for developers
You are limited to running up to a total of
20 On-Demand instances across the instance family, purchasing 20
Reserved Instances, and requesting Spot Instances per your dynamic spot
limit per region (by default) Amazon EC2 currently supports a
variety of operating systems including: Amazon Linux, Ubuntu,
Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise
Server, Fedora, Debian, CentOS, Gentoo Linux, Oracle Linux, and
FreeBSD EC2 compute units (ECU) provide the relative measure of the
integer processing power of an Amazon EC2 instance
With EC2 you have full control at the operating system
layer
Key pairs are used to securely connect to EC2
instances:
A key pair consists of a public key that AWS
stores, and a private key file that you store For Windows
AMIs, the private key file is required to obtain the password used to log
into your instance For Linux AMIs, the private key file allows you
to securely SSH into your instance
Metadata and User Data:
User data is data that is supplied by the user at instance
launch in the form of a script Instance metadata is data about your
instance that you can use to configure or manage the
running instance User data is limited to 16KB User data and
metadata are not encrypted Instance metadata is available at http://169.254.169.254/latest/meta-data The
Instance Metadata Query tool allows you to query the instance
metadata without having to type out the full URI or category names
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