Cloud Computing : Simply in Depth by Singh Ajit

Author:Singh, Ajit [Singh, Ajit]
Language: eng
Format: epub, azw3, pdf
Published: 2021-04-30T16:00:00+00:00

Figure: .An overview of the components that support Amazon EC2

​ Instance

An Amazon EC2 instance is a virtual server running your choice of guest operating system based on the machine image from which the instance was created.

Amazon Machine Image (AMI)

A copy of your server that you can use to launch any number of instances. If you are familiar with the concept of ghosting, the machine image represents your ghost image from which you can build any number of servers. Minimally, a machine image will have the core operating system plus common preinstalled tools. Amazon has some prebuilt AMIs to get you started easily.

​ Elastic IP address

This is simply a static IP address that is assigned to you. (The term elastic doesnt mean a dynamic address, it is a static one) By default, each Amazon instance comes with a dynamically assigned IP address that may be reassigned to another user when your instance terminates. Elastic IP addresses are reserved to you and thus useful for instances that must always be accessible by the same static IP address.

​ Region

A group of availability zones that form a single geographic cluster. Until now, Amazons service level agreement (SLA) for EC2 guarantees 99.95% availability of at least two availability zones within a region over the course of a 12-month period .

​ Availability zone

Almost analogous to a data center. Amazon currently has three zones in the U.S., all on the east coast. It also has two zones in western Europe. You may optionally define the availability zone into which you launch your instances to create a level of location redundancy for your applications.

​ Security group

Very roughly analogous to a network segment protected by a firewall. You launch your instances into security groups and, in turn, the security groups define what can talk to your new instances and what is prohibited.

​ Block storage volume

Like a SAN (storage area network), it provides block-level storage that you can mount from your EC2 instances. You can then format the volume as you want, or write raw data to the volume.

​ Snapshot

You may take snapshots of your block volumes for backup or replication purposes. These snapshots are stored in Amazon S3, where they can be used to create new volumes.

​ Amazon EC2 Access

Like Amazon S3, the primary means of accessing Amazon EC2 is through a web services API. Amazon provides a number of interactive tools on top of their web services API, including:

o The Amazon Web Services Management Console

o The ElasticFox Firefox plug-in

o The Amazon Command Line tools

The example explained here focuses on using the management console which is one of the easiest and user friendly means.

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