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Migrating Applications to Azure Cloud

Migrating Applications to Azure Cloud. Azure migration is a porting project. Gap Analysis. Risk Reduction. Cost Analysis. Migration. Choosing a porting model. Web sites migrate into web roles. Web Role. Worker Role. VM Role.

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Migrating Applications to Azure Cloud

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  1. Migrating Applications to Azure Cloud

  2. Azure migration is a porting project Gap Analysis Risk Reduction Cost Analysis Migration

  3. Choosing a porting model

  4. Web sites migrate into web roles Web Role Worker Role VM 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 transports Simple, 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 state • ASP.NET cache is not shared between instances as well • Move session to SQL azure • Velocity for Azure is coming later in the year • You can use memcached meanwhile

  10. Tip: Move configuration from app.config/web.config • Changes in web.config – mean redeployment • Move

  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> <application fullPath="%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 Role Worker Role VM Role

  15. Run under full IIS to get scale out and management capabilities Service 1 Service 1 Service 2 Service 2 Service 3 Service 3 Web 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-policy Drop crossdomain.xml in the root directory of the WebRole

  17. Stateful services/ “semi-stateful” services Web Role Worker Role VM Role

  18. VM Role vs. Worker Role – another look • VM 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 simpler • CloudDrive • Mapping logs to table storage

  20. Tip: pay attention to how you configure your logging By the way this setup cost 5.25$ per year (per instance and just for the transactions)

  21. Lavaflow Apps http://www.antipatterns.com/lavaflow.htm

  22. The lavaflow apps migrate into VM role Web Role Worker Role VM 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. Db3 Archive (Table Storage) … NT Service IIS Migrated SQL CLR Code VM Role NT Service Db1 (SQL Azure) Db2 (SQL Azure) Db3 (SQL Azure

  25. Getting Azure’s SLA means at least 2 instances • Must 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 • Not guaranteed to be persistent • Need to build availability on top

  27. SQL Migration Wizard

  28. Tip: SQL Retry • SQL Connections: Retry on failure • Connections can drop for variety of reasons • Idleness • Transient (network) errors • Intentional throttling • First step: reconnect immediately • Handles idleness- and transient-disconnects • Gateway handles connection retry for app • Connections attempted for ~30s before failure • What to do on connection failure? • Wait (10 seconds), then retry • Change your workload if throttled

  29. Backup & Restore

  30. Existing apps were developed in an age of abundance in resources Cloud apps should be more cost aware

  31. What else? • Monitoring •  Application Lifecycle Management (including system & performance testing) • ·         Archiving • ·         Authentication and authorization (between tiers as well as of users) • ·         CDNs • ·         Charging model • ·         Configuration • ·         Data Access Layer • ·         Data encryption • ·         Data partitioning •  Data storage and transactions •          Dependencies and 3rd party components •          Deployment, continuous integration & automation •          Diagnostics, logging & instrumentation •        Elasticity (dynamic, scheduled, or manual) • ·         Geographical co-location • ·         Idempotency • ·         Import/export routines •         Message security • ·         Message size • ·         Multi-tenancy • ·         Network latency • ·         Page weight • ·         Reporting • ·         Session state • ·         SLAs (availability, performance, etc) • ·         SQL features • ·         Windows Services & batch jobs http://blogs.msdn.com/b/simonince/archive/2010/04/13/checklist-discussing-an-azure-migration.aspx

  32. E.g. Can’t host SMTP server in the cloud • Can open TCP connection from Azure to the outside world … (and find a SMTP server)

  33. e.g. remember Authentication with ACS Slide by Alik Levin

  34. Links • TCO 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.aspx • Cloudoscope – http://www.cloudvalue.com

  35. Illustrations • All illustrations from Stockphoto except: • Slide 3 John Nyberg http://www.sxc.hu/photo/1329579 • Slide 18 http://www.majorlycool.com/item/beautiful-but-deadly-lava-flow • Slide 26 http://www.sxc.hu/photo/1212823 • Slide 28 http://www.sxc.hu/photo/1316747

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