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godwin daniel's avatar
godwin daniel
Brass Contributor
Aug 22, 2018
Solved

How to Modify application hosted by virtual machine scale sets

This is a hypothetical question as I am just doing my prep for azure cert. Suppose I have a web application front end hosted  on a scale set, I set the minimum number of machines to 2 which gives me ...
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virtual machine
Virtual Machine Scale Set
  • Huiyu Wang's avatar
    Huiyu Wang
    Sep 22, 2018

    Also, it is recommended that the App deploy/Update is managed by Azure Custom Scriptr Extension. By updating the CSE url, all the VMs in the Scale Set will be automatically update to the latest according to update policy.

     

    https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/tutorial-install-apps-cli

Huiyu Wang's avatar
Huiyu Wang
Copper Contributor
Sep 22, 2018

Hi, the VMSS resource property upgradePolicy can be set to either the value manual or automatic. If automatic, when an operating system update is available all instances are updated at the same time,  which causes downtime. If the property is set to manual, it is up to you to programmatically step through and update each instance using PowerShell. Check the details below:

 

https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-upgrade-scale-set

 

Henry

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