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CLOUD COMPUTING
AGENDA
Overview Popular Definitions Deployment Models Delivery Models – IaaS, PaaS, SaaS NoSQL Vendor Lock-in Security Concerns
WHAT IS CLOUD COMPUTING?
CLOUD COMPUTING OVERVIEW
Sharing Resources Abstraction of Software Development Details Scalability High Processing Power Reliability / Availability Pay – as – you – use Peak load performance Simplified maintenance:
CLOUD COMPUTING DEFINITIONS
OSSM 5-3-4
DEFINITION : OSSM
On-demand: the server is already setup and ready to be deployed
Self-service: customer chooses what they want, when they want it
Scalable: customer can choose how much they want and ramp up if necessary
Measureable: there's metering/reporting so you know you are getting what you pay for
DEFINITION : 5 – 3 – 4 5 Basic Characteristics
On-Demand Ubiquity – (irrespective of location, app should be accessible) Location Independent Resource Pooling Elasticity Pay per Use
3 Delivery Models IaaS PaaS SaaS
4 Deployment Models Public Cloud Private Cloud Hybrid Cloud Community Cloud
DEPLOYMENT MODELS
PUBLIC CLOUD
Most standard Cloud Computing Model Same infrastructure/resources are to be used
by other tenants/businesses Vendor makes Hardware/Software available
as services over internet Pay per use pricing model No CAPEX, Only OPEX No wasted resources, pay only for what you
use Examples : Amazon EC2, IBM Blue Cloud,
GAE, Azure
PRIVATE CLOUD
Not truly a cloud High CAPEX Rather, cloud like on-premise infrastructure
with horizontal scalability,availability,etc Or off-shore infrastructure behind a corporate
firewall Maintenance can still be outsourced Concerns of Security are minimized More control over data Examples : Amazon EC2 &S3(Simple Storage
Service)
HYBRID CLOUD
Composition of atleast one Private Cloud and atleast one Public Cloud
All the involved clouds maybe provided by the same or different vendors
Allows scalability of Public Cloud, without exposing sensitive data
Use Case : Archived Data on Public Cloud, Operational Data on
Private Cloud
DELIVERY MODELSIaaS PaaS SaaS
IAAS (INFRASTRUCTURE AS A SERVICE)
IAAS (INFRASTRUCTURE AS A SERVICE)
On Demand Storage & Processing - Computing as a Service
Hardware, its Software, Electricity, Cooling, Connectivity all managed by Vendor
Pay-as-you-go Difference between Shared Hosting v/s Cloud
Infrastructure Flexible
IAAS… (CONTD…)
Provides infrastructure management tools. Vendors : Amazon EC2, Rackspace, etc Tools are available to monitor performance,
peak load conditions, etc Scaling, Monitoring , etc are still a
responsibility of the Service Buyer
HOW TO CHOOSE AN IAAS VENDOR?
Support – Email, Phone, 24 x 7? Hardware, its configuration and Performance Partnership with Middleware Vendors
Eg: Amazon EC2 has partnered with IBM,Microsoft,RedHat, Oracle,etc.
Licensing Windows Licences cannot be migrated from local
data center to Cloud IBM Websphere not available with EC2
PAAS (PLATFORM AS A SERVICE)
PAAS (PLATFORM AS A SERVICE)
A platform to develop applications that can be deployed on the cloud
Framework / Platform is hosted on the Cloud Development language and platform is
vendor decided Infrastructure management by Vendor Scalability and management is provided by
the Vendor No Licensing hassles Vendors: Force.com, Google App Engine,
Microsoft Azure, Heroku Drawback : Vendor Lock in
FORCE.COM :
Very easy to use Web Interface to create a web application
Code generation, compilation, deployment, etc happens on Force.com servers
Also has Eclipse Plugin based development Asks for Force.com credentials Code compilation and deployment happens on
Force.com servers, seamlessly Development in Apex(Dev) and VisualForce (UI) Supports Agile
HEROKU
Development, deployment, scaling Heroku’s Ruby Platform lies on AWS Used by Facebook for scaling and application
development Dev Languages : Ruby on Rails, Java Now acquired by Force.com
GOOGLE APP ENGINE (GAE)
SDK for Java and Python Provides Eclipse Plugin Big Table DataStore Simple App Configuration Automatic Scaling, No performance Tuning is
required Quotas - request count, bandwidth usage, CPU
usage, datastore call count, disk space used, emails sent, even errors!
WINDOWS AZURE
Windows Azure Tools for Visual Studio Technology Stack and Tools :
Azure tools for Visual Studio Azure SDK Visual Web Developer (replacement for Visual
Studio) ASP.NET MVC3 (framework) IIS
WINDOWS AZURE STACK
Windows Azure – Cloud OS as a Service 5 Services – Live Services, SQL Azure,
AppFabric, Sharepoint, Dynamic CRM SQL Azure – Cloud based SQL Server Azure AppFabric – Collection of Services
(Caching,Service Bus,Integration) Azure Platform Alliance (non-MS Datacenters)
AZURE DEVELOPMENT PLATFORM
ASP.NET Framework PHP SDKs for Java and Ruby help integrate with
AppFabric Services
SAAS (SOFTWARE AS A SERVICE)
SAAS (SOFTWARE AS A SERVICE)
Enterprise Application without installation overhead
Applications that are available to be used over the internet
Pay per user Account Scalable to multiple users and tenants Applications like SalesForce.com,
Gmail,Google Apps,etc
DATABASE FOR THE CLOUD
PROBLEMS WITH TRADITIONAL DATABASES FOR CLOUD
Big Data - Big data are datasets that grow so large that they become awkward to work with using on-hand database management tools
Difficulties include capture, storage, search, sharing, analytics, and visualizing of vast data
NOSQL
Can service heavy read/write workloads Usually Avoid Join Operations Scale Horizontally Works well even with cheap commodity
servers Flexible – Schema changes are easy to make Examples : Big Table, Mongo DB, Hadoop,
Cassandra, Amazon SimpleDB
NOSQL - CHALLENGES
Quota limits Max 1000 records per query Query times out in 5 seconds
Maturity – Nascent compared to RDBMS Support – Mostly Open Source. Support
driven by startups with no true global reach Administration – Installation & Maintenance
skill is not easily available Expertise – Not easily unavailable, which is
unacceptable to businesses
VENDOR LOCK-IN
Definition – Stuck with 1 vendor because of complexity to move to another vendor
Scenarios to move out of a Cloud Vendor: Cost Shut Down of Services New choice of Services offered by another Vendor
How to avoid/minimize vendor lock-in chances?
While architecting your app, ensure vendor-specific services are judiciously used
Evaluate Options Check ROI Read about upcoming features/services
VENDOR LOCK-IN
IaaS Less lock-in Data Migration is of moderate difficulty
PaaS Tightly coupled to vendor Migration to another vendor may require re-
engineering the application
SECURITY IN CLOUD COMPUTING
Issues: Data Integrity Recovery Network security Access and Authentication procedures Data encryption techniques Tenant isolation
Most issues are now controlled or resolved Still considered unsafe for Financial data
USE CASES
UNCERTAINTY OF LOAD
Zynga has both Private and Public Cloud services at disposal
New Game launches on Public Cloud When usage is stabilized, then migrated to
Private Cloud
SHORT-TERM USAGE
Seasonal Apps Event Websites OCR to Doc Conversion
NETFLIX
Completely out of Cloud Highly fluctuating usage of large multimedia
data Across different geographical locations Speedy Access
LIMITATIONS
LIMITATIONS OF CLOUD COMPUTING
Connectivity is mandatory Security Skills – Development and Administration Network Bandwidth Not suitable for all businesses