feat(terraform): Ensure that the AKS cluster encrypt temp disks, caches, and data flows between Compute and Storage resources #5588
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…es, and data flows between Compute and Storage resources (#5588) * Create check * Correct the wrong TF test --------- Co-authored-by: Thomas Defise <[email protected]> Co-authored-by: James Woolfenden <[email protected]>
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Description
Fixes #5586
New/Edited policies (Delete if not relevant)
With host-based encryption, the data stored on the VM host of your AKS agent nodes' VMs is encrypted at rest and flows encrypted to the Storage service. This means the temp disks are encrypted at rest with platform-managed keys. The cache of OS and data disks is encrypted at rest with either platform-managed keys or customer-managed keys depending on the encryption type set on those disks.
By default, when using AKS, OS and data disks use server-side encryption with platform-managed keys. The caches for these disks are encrypted at rest with platform-managed keys. You can specify your own managed keys following Bring your own keys (BYOK) with Azure disks in Azure Kubernetes Service. The caches for these disks are also encrypted using the key you specify.
Host-based encryption is different than server-side encryption (SSE), which is used by Azure Storage. Azure-managed disks use Azure Storage to automatically encrypt data at rest when saving data. Host-based encryption uses the host of the VM to handle encryption before the data flows through Azure Storage.
Note that on the documentation of Terraform, it is seen as "Preview".
However, it has been set as "General availability" on May 25, 2021
Fix
Enable "Encryption At Host"
Checklist: