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Azure migration
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.
In this document
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Overview of the presenter and topic focusing on migrating applications to Azure Cloud.
Discusses Azure migration as a project involving gap analysis, risk reduction, and cost analysis.
Choosing a porting model with details on web roles, worker roles, and VM roles for migrating applications.
Transitioning web applications to Azure, including key considerations like session state and configuration changes.
Tips on handling ISAPI filters, adding configurations for PHP in web roles, and enabling native code.
Overview of stateless and stateful services, the differences between VM roles and worker roles, and migration aids.
Importance of configuring logging for cost management, specifically $5.25 per year for logging transactions.
Issues with registry updates in Azure and details on SQL Azure for database migration.
Need for multiple instances to meet Azure SLA and considerations for hosting SQL databases.
Utilizing SQL Migration Wizard and implementing retry logic for SQL connection failures.
Discusses backup, restore, and various considerations for developing cloud-native applications.
Clarifies limitations such as hosting an SMTP server and authentication with ACS.
Providing useful resources including TCO calculators and migration wizards for Azure.
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Azure migration
- 1. ArnonRotem-Gal-OzVP Product Deliverywww.codevalue.netMigratingApplications to Azure Cloud
- 2. Azure migration isa porting projectGap AnalysisRisk ReductionCost Analysis Migration
- 3. Choosing aporting model
- 4. Web sites migrateinto web rolesWeb RoleWorker RoleVM Role
- 5. Moving web sitesto 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 FullIIS <Sites> <Site name="Web"> <Bindings> <Binding name="Endpoint1" endpointName="Endpoint1" /> </Bindings> </Site> </Sites>Add Sites to the csdef file….
- 9. Tip: Shy awayfrom 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 configurationfrom app.config/web.configChanges in web.config – mean redeploymentMove
- 11. Tip: native codeISAPI filters are tricky to import…Consider rewriting
- 12. Can you Azurethis?<html> <head><title>Hello World PHP</title></head> <body> <?phpecho 'Today is '. date('Y-m-d') ."\n"; ?> </body> </html>
- 13. Add a Webrole.config…<?xmlversion="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 WebRoleWorker RoleVM Role
- 15. Run under fullIIS to get scale out and management capabilities Service 1Service 1Service 2Service 2Service 3Service 3Web Role (full IIS)Web Role (full IIS)
- 16. Tip: Make yourWCF 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 includesfacilities to make migration simplerCloudDriveMapping logs to table storage
- 20. Tip: pay attentionto how you configure your loggingBy the way this setup cost 5.25$ per year (per instance and just for the transactions)
- 21.
- 22. The lavaflow appsmigrate into VM roleWeb RoleWorker RoleVM Role
- 23. Don’t COM aroundhere no more(can’t update the registry)Use COM+ and manifest / Native C++Wrap with WCF host
- 24. Db3Archive(Table Storage)…NT ServiceIISMigratedSQL CLR CodeVM RoleNT ServiceDb1(SQL Azure)Db2(SQL Azure)Db3(SQL Azure
- 25. Getting Azure’s SLAmeans at least 2 instancesMust make sure app can “scale” to two computers – even for VM role
- 26. Tip: Why nothost your own SQL?Disks partitioning is unknown and does not come with an SLA
- 27. Not guaranteed tobe persistent
- 28. Need to buildavailability on top SQL Migration Wizard
- 29. Tip: SQL RetrySQL 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.
- 31. Existing apps weredeveloped in an age of abundance in resourcesCloud apps should be more cost aware
- 32. What else?Monitoring Application LifecycleManagement (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 hostSMTP server in the cloudCan open TCP connection from Azure to the outside world … (and find a SMTP server)
- 34. e.g. remember Authenticationwith ACSSlide by Alik Levin
- 35. LinksTCO calculator http://www.microsoft.com/windowsazure/economics/AzureMigration 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 fromiStockphotoexcept: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)