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[经验分享] Migrating legacy system to Azure Cloud

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发表于 2017-6-30 08:58:02 | 显示全部楼层 |阅读模式
  Some of the questions we need to answere is that
  Data Storage
  3rd party libary
  middleware
  Things to considered each building block (technology stacks) at on premise app architecture has corresponding azure building blocks.
  VM - Iaas vm service
  db - azure db
  storage - blob
  distributed architecure -
  cache
  api
  queue
  bus
  authenticstion
DSC0000.jpg
  Phases the migration depend on the techinical challenges and business needs.
  One catch all note: migration cannot be one stop shopping, inevitablly this can be done in phases, hybrid architecture will be helpful to organize the building block of a application in different env work together during transitinal period.
  migration is Depend on the business initiative.
  The end goal is for each migration stage, we need to keep the business running for customer without disruption.
  Usually migrating db from sql server to azure sql is the easiest piece.
  You always has the flexibility to consider hybrid architecture using relay service while keeping the front end at on prem and migrate the backend to azure or vice versa depend on your biz needs and the pace you want to plan the migration.
  Then other options are migrate
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  Some limitation at azure sql compare to sql server.

  • 1msdtc (transaction) is not supported.
  • 2column level encrytion is not supported
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  • 3.Cross db inquery
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  • 4.azure sql mandate primary key cluster index.
  sql migration wizard and redgate is 2 recommended option.
  click on db - task - export to azure. result of export will display detail error msg.
  Nice about sql mw is it allows preview of the migrate compatibility issue before migrate happens.
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  change the setting to point to Azure db
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Migrate services
ServiceBus.
  Client app to communicate with backend app if they are in same net work which should be easy.
  If they are in different env and communicating behind fire wall that will be cubersome.
  ServiceBus Relay service can play a role of trusted party to help both side to communicate particularly useful in hybrid architecture.
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  MSMQ - > ServieBus Queue
  SB queue is storage location for messages, msmq to servicebus queue is comparatively simple requires mimimum re-coding.
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  Relay service
  The typical use scenario is point to point communiction, client to server service call or server to server service call
  Access Control Service (ACS)
  ACS help with moving AD authentioncation to Cloud
DSC00010.jpg   Setup at Azure AC service
   DSC00011.jpg
  
Change application to use ServiceBus.
  Having the service resides at on-prem to be called by client anywhere out of on-prem is a big challeges to be resloved with relay service
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  Client used to point to local msmq now to service bus queue with binding change to NetMessagingBinding
  Client used to listen on local msmq now to service bus queue
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  Web applicaiton & Authentication migration
Our scenario - Moving the local website and authention to the azure using web role and authentication access control
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  Active Dirctory Federation Service will query Active Directory base on different standard, SAML claim returns comprehensive ifno for NAME, GROUP and EMAIL
DSC00018.jpg DSC00019.jpg
  ACS host at Azure offers endpoint for ADFS at local AD server to point to get meta data
DSC00020.jpg DSC00021.jpg   Paste the ACS metadata URL to Relying Party at local AD
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  Map the rule DSC00023.jpg

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