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Azure image verification overview

Contributors netapp-driley
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Azure image verification complies with enhanced NetApp security requirements. While verifying an image file is a straightforward process, Azure image signature verification does require special handlings to the well-known Azure VHD image file due to an alternation made by the Azure marketplace.

Note Azure image verification is supported on Cloud Volumes ONTAP software version 9.15.0 or greater.

Azure's alteration of published VHD files

The leading 1MB(1048576 bytes) and ending 512 bytes of VHD file is modified by Azure. NetApp image signing skips the leading 1MB and ending 512 Bytes and signs the remaining VHD image portion.

An image that shows Azure's alternation of 10GB VHD file

As an example, the above diagram shows a VHD file sized 10GB. But the NetApp signed portion is marked in green with size of 10GB - 1MB - 512B.