B. Ramamurthy 4/17/20151

Overview of EC2 Components (fig. 2.1) 10..* /17/20152

 S3: accessing s3, working with S3: command line as given in the blue book or through aws console  You can create directories: your own namespace  You can transfer with a click of a button data in and out of S3 (lets check it out)  You can simply continue to shove data into Amazon S3 without having to worry about ever running out of space!  Short-term and long-term backup facility.  Access to S3 is via web services and not via file system: so relatively slow.  See demo 4/17/20153

 You want to create an “instance” of a server from an already established “AMI: Amazon Machine Image”  It has a elastic IP for the whole world to interact with it.  How to control access to this?  While creating the instance, create a new security group that will specify the policy or “rules” about the access methods  Security group is somewhat similar to network segment protected by a firewall  Once the server is started you cannot change the security group: so plan ahead  See Demo 4/17/20154

 Availability zones are analogous to a physical data center.  Amazon keeps adding availability zones: US East (Virginia), US East (N. California), EU West (Ireland), Asia (Singapore)  Am important feature is that zones have different characteristics that no two zones will be down at any time.  You can spread your data between two zones or replicate it in 2 or more zones for survivability.  Traffic (bandwidth) between zones cost money.  You may want to launch in the same zone if bandwidth is your concern; but if redundancy is your quest, you may need different zones 4/17/20155

 Access to an instance is (for ssh) is through a key pair. Another enabling technology is PKI  You generate a private-public key pair, store the private key in your local hard drive, the public key is passed to the instance when it is launched.  EC2 instance is configures such that root account is accessible to any user with the private key. 4/17/20156

 By default when you launch a new instance amazon dynamically assign a private and a public IP.  While this is fine for development purposed, for a real launch of a web accessible service, we need static IP.  Amazon makes available what are classes elastic IPs for this purpose. Up to 5 elastic IPs can be assigned to an instance. Elastic IPs cost money even if you don’t use them; assigning and reassigning strains the system; so it cost money  Allocate elastic ip and associate it with an instance. 4/17/20157

 Snapshot is for saving a volume (of storage) is a feature of Amazon’s elastic block storage.  You can take a snapshot as often as needed.  EC2 automatically saves the snapshots to S3, thus enabling a quick and powerful backup scheme.  You can replay it by creating a volume from snapshot. See demo. 4/17/20158

 You can use already existing AMI to bootstrap your system  AMI contains root file system for your image.  You will have clean up all your files and store them in S3 or snap shot them so that they can be replayed.  Stop the sql server  Name it and create it with a description. 4/17/20159

1. Data-intensive Data structures: HDFS. 2. Data-intensive Algorithms: MapReduce. use it in a scenario given below. 3. Cloud architectures: AWS: EC2, S3, + Google App engine, AWS (Chapter 1,2 in bluebook) 4. Enabling Technologies: infrastructure realization: Virtualization, infrastructure management 5. Project 1 and Lucene: 4/17/201510