Azure migration
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This document discusses strategies for migrating applications to the Azure cloud platform. It covers choosing a porting model like moving web sites to web roles. Tips are provided like enabling full IIS, moving configuration out of web.config, and rewriting native code ISAPI filters. Stateful and stateless services running on worker roles or VM roles are also discussed. The document provides additional migration tips around logging, SQL, and monitoring applications in the cloud.
Azure migration
- 1. ArnonRotem-Gal-OzVP Product Deliverywww.codevalue.netMigrating Applications to Azure Cloud
- 2. Azure migration is a porting projectGap AnalysisRisk ReductionCost Analysis Migration
- 3. Choosing a porting model
- 4. Web sites migrate into web rolesWeb RoleWorker RoleVM Role
- 5. Moving web sites to Azure is not very different then moving them to a web-farm
- 6. Can’t use Web-sites …Must use web applications (VS will port for you)
- 7. Full IIS vs. Hosted Web Core Multiple sites or virtual applications activation of WCF services over non-HTTP transportsSimple, less resources
- 8. Tip: Enable Full IIS <Sites> <Site name="Web"> <Bindings> <Binding name="Endpoint1" endpointName="Endpoint1" /> </Bindings> </Site> </Sites>Add Sites to the csdef file….
- 9. Tip: Shy away from session stateASP.NET cache is not shared between instances as wellMove session to SQL azureVelocity for Azure is coming later in the yearYou can use memcached meanwhile
- 10. Tip: Move configuration from app.config/web.configChanges in web.config – mean redeploymentMove
- 11. Tip: native code ISAPI filters are tricky to import…Consider rewriting
- 12. Can you Azure this?<html> <head><title>Hello World PHP</title></head> <body> <?phpecho 'Today is '. date('Y-m-d') ."\n"; ?> </body> </html>
- 13. Add a Webrole.config…<?xml version="1.0" encoding="utf-8" ?><configuration><system.webServer><fastCgi><applicationfullPath="%RoleRoot%\approot\php\php-cgi.exe"/></fastCgi></system.webServer></configuration>…and enable native code in the .csdef<WebRolename="WebRole"enableNativeCodeExecution="true
- 14. Stateless services Web RoleWorker RoleVM Role
- 15. Run under full IIS to get scale out and management capabilities Service 1Service 1Service 2Service 2Service 3Service 3Web Role (full IIS)Web Role (full IIS)
- 16. Tip: Make your WCF accessible to silverlight clients <?xml version="1.0" encoding="utf-8" ?><!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"><cross-domain-policy><allow-http-request-headers-from domain="*" headers="*"/></cross-domain-policyDrop crossdomain.xml in the root directory of the WebRole
- 17. Stateful services/ “semi-stateful” services Web RoleWorker RoleVM Role
- 18. VM Role vs. Worker Role – another lookVM role you can do anything but things are not persisted VM role needs manual maintenance (e.g. upgrades to OS)
- 19. Worker Role includes facilities to make migration simplerCloudDriveMapping logs to table storage
- 20. Tip: pay attention to how you configure your loggingBy the way this setup cost 5.25$ per year (per instance and just for the transactions)
- 22. The lavaflow apps migrate into VM roleWeb RoleWorker RoleVM Role
- 23. Don’t COM around here no more(can’t update the registry)Use COM+ and manifest / Native C++Wrap with WCF host
- 24. Db3Archive(Table Storage)…NT ServiceIISMigrated SQL CLR CodeVM RoleNT ServiceDb1(SQL Azure)Db2(SQL Azure)Db3(SQL Azure
- 25. Getting Azure’s SLA means at least 2 instancesMust make sure app can “scale” to two computers – even for VM role
- 26. Tip: Why not host your own SQL?Disks partitioning is unknown and does not come with an SLA
- 27. Not guaranteed to be persistent
- 28. Need to build availability on top SQL Migration Wizard
- 29. Tip: SQL Retry SQL Connections: Retry on failureConnections can drop for variety of reasonsIdlenessTransient (network) errorsIntentional throttlingFirst step: reconnect immediatelyHandles idleness- and transient-disconnectsGateway handles connection retry for appConnections attempted for ~30s before failureWhat to do on connection failure?Wait (10 seconds), then retry Change your workload if throttled
- 30. Backup & Restore
- 31. Existing apps were developed in an age of abundance in resourcesCloud apps should be more cost aware
- 32. What else?Monitoring Application Lifecycle Management (including system & performance testing) Archiving Authentication and authorization (between tiers as well as of users)CDNsCharging modelConfigurationData Access LayerData encryption Data partitioning Data storage and transactions Dependencies and 3rd party components Deployment, continuous integration & automationDiagnostics, logging & instrumentation Elasticity (dynamic, scheduled, or manual) Geographical co-locationIdempotencyImport/export routines Message security Message size Multi-tenancyNetwork latency Page weightReporting Session state SLAs (availability, performance, etc) SQL features Windows Services & batch jobshttp://blogs.msdn.com/b/simonince/archive/2010/04/13/checklist-discussing-an-azure-migration.aspx
- 33. E.g. Can’t host SMTP server in the cloudCan open TCP connection from Azure to the outside world … (and find a SMTP server)
- 34. e.g. remember Authentication with ACSSlide by Alik Levin
- 35. LinksTCO calculator http://www.microsoft.com/windowsazure/economics/Azure Migration Wizard - http://sqlazuremw.codeplex.com/http://blogs.msdn.com/b/windowsazure/archive/2010/12/02/new-full-iis-capabilities-differences-from-hosted-web-core.aspxCloudoscope – http://www.cloudvalue.com
- 36. IllustrationsAll illustrations from iStockphotoexcept:Slide 3 John Nyberg http://www.sxc.hu/photo/1329579Slide 18 http://www.majorlycool.com/item/beautiful-but-deadly-lava-flowSlide 26 http://www.sxc.hu/photo/1212823Slide 28 http://www.sxc.hu/photo/1316747
Editor's Notes
- #3: InterviewsArchitecture & design reviewAssessment tools (e.g. SQL Azure Migration wizard, TCO calculator)