Introduction to Cloud Computing and Microsoft Windows Azure:-
Web Role
¨Based on ASP.NET 3.5 SP1 – 64bit
¨Web Projects
.ASPX
FastCGI applications (e.g. PHP)
Java Apps
Static Content
¨Http(s)
¨WebRole
New web.roleConfig to support FastCGI
Worker Role
¨Managed Class Library
¨Inherits RoleEntryPoint
¨Start() Method
¡Called by Fabric on startup
¡Do not return from Start
¨Stop() Method
¡Called when role is to be shutdown
¨GetHealthStatus()
¡Heartbeat for Health
Azure Components – AppFabric
– Extending .NET to the Cloud with Internet scale utility services
Service Bus:
General purpose application bus on Internet – such as Enterprise Service Bus on-premise
Access Control:
Rules-driven, claims-based access control rules transformation engine
Workflow Service – Not available currently:
Shared hosting of workflows
Azure Components – SQL Azure
– Extending SQL Server Data Platform to the Cloud
Queues
¨Decouple Roles
¨First In Last Out
¨Design for guaranteed message delivery
Configuration
Two main configuration files
ServiceConfiguration.csdef – Definition File
ServiceConfiguration.cscfg – Instance Data Configuration
Web.Config vs. ServiceConfiguration.cscfg
Environments
There are 2 environments available on Azure
¡Staging
¡Production
Applications can be promoted or demoted from staging and production
Logging
¨No debugging in Cloud
¨Standard diagnostics Trace APIs
¨Collect the following types of diagnostics data
IIS Logs
Failed Request Logs
Performance Counters
Windows Event Logs
Application crash dumps
¨Use Azure Storage for transferring logs on an on demand or scheduled basis
¨To enable the diagnostic trace listener, add the following configuration file to your role’s web.config or app.config file:
Few Cloud scenarios-
-Large User Load for application(s)
-Variable User Load for application(s), dynamic Scale up / down required
-Start ups who do not intend to invest in infrastructure
-Seasonal / Periodic applications
Enterprises required Cost effective web / data solutions
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