Upgrades
After VMSS and applications are deployed, they need to be actively maintained. Planned maintenance should be conducted periodically to ensure that both environment and application is up to date with latest bits and the environment is current from a security and resilience point of view.
Upgrades can be associated with applications, the guest virtual machine instance, or to the image itself. Upgrades can be quite complex because they should happen without affecting the availability, scalability, and performance of environments and applications. To ensure that updates can take place one instance at a time using rolling upgrade methods, it is important that VMSS supports and provides capabilities for these advanced scenarios.
There ...
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