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KVM Virtualization Cookbook by Konstantin Ivanov

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How it works...

There are two main types of snapshot:

  • An internal snapshot: The base image file itself contains the saved state and all subsequent changes to the virtual machine
  • An external snapshot: The base image will contain the saved state of the virtual machine thus becoming a read-only base image, and a new overlay image is created to track any future changes

Both types of snapshots can be performed on just the disk or the memory of the virtual machine, either on a live or stopped instance.

In the preceding step 1, we create an internal snapshot of the virtual machine. After the snapshot, there's only one image file: the original image, now containing the snapshot. We can see that the image is a snapshot in step 4, under the Snapshot ...

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