CREATING VIRTUAL MACHINES

摘要

A method to create virtual machines is provided. An initially empty primary copy-on-write (COW) image of a base disk image is created, and an initially empty secondary COW image of the primary COW image is created. A virtual machine is booted from the secondary COW image. Writes by the virtual machine are stored in the secondary COW image. When the secondary COW image reaches a capacity threshold, data of the secondary COW image is committed into the primary COW image and then the secondary COW is cleared of data.

主权项

1: A method to create virtual machines, comprising:
creating an initially empty primary copy-on-write image of a base disk image, the base disk image being a template for the virtual machines; creating an initially empty secondary copy-on-write image of the primary copy-on-write image; booting a virtual machine from the secondary copy-on-write image; storing writes by the virtual machine writes in the secondary copy-on-write image; and when the secondary copy-on-write image reaches a capacity threshold, committing data from the secondary copy-on-write image into the primary copy-on-write image and clearing the secondary copy-on-write image.