I'm using Azure VMSS. I've changed imageReferenceSku from 2016 to 2019. I just want to make sure that this action results a reimaging. I've read that reimaging deleted unused certificates on the VMSS so I want to make sure it did reimaged.
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Changing imageReferenceSku from 2016 to 2019 works like the OS upgrade manually.
From the docs, Automatic OS upgrade has the following characteristics:
The OS Disk of a VM is replaced with the new OS Disk created with latest image version. Configured extensions and custom data scripts are run, while persisted data disks are retained.
Compare with it, I don't think os upgrading will result in VMSS reimage.
If you reimage a VM, certificates are deleted. Reimaging deletes the entire OS disk.
Nancy
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