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Microsoft Azure Development Cookbook Second Edition by Neil Mackenzie, Roberto Freato

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Managing upgrades and changes to a Cloud Service

Microsoft Azure instances and the guest OS they reside in have to be upgraded occasionally. The Cloud Service might need a new software deployment or a configuration change. The guest OS might need a patch or an upgrade to a new version. To ensure that a Cloud Service can remain online 24/7 (an SLA of 99.95%), Microsoft Azure provides an upgrade capability that allows upgrades to be performed without stopping the Cloud Service completely as long as each role in the service has two or more instances.

Microsoft Azure supports two types of upgrade: in-place upgrade and Virtual IP swap. An in-place upgrade applies changes to the configuration and code of existing virtual machines (VM) that host instances ...

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