System and method to transform an image of a container to an equivalent, bootable virtual machine image

• US 10,642,624 B2
• Filed: 01/31/2018
• Issued: 05/05/2020
• Est. Priority Date: 01/31/2018
• Status: Active Grant

• Current Assignee: Nutanix Incorporated
• Original Assignee: Nutanix Incorporated
• Inventors: Shanker, Rabi, Saxena, Prerna, Rapole, Raghu Prasad
• Primary Examiner(s): Bae, Ji H
• Application Number:
  US15/884,837
• Publication Number:
  US 20190235879A1
• Time in Patent Office: 825 Days
• Field of Search: 713 1, 713 2
• CPC Class Codes: G06F 2009/45562 Creating, deleting, cloning virtual machine instances
• CPC Class Codes: G06F 2009/45575 Starting, stopping, suspending or resuming virtual machine instances
• CPC Class Codes: G06F 2009/45595 Network integration; Enabling network access in virtual machine instances
• CPC Class Codes: G06F 9/4406 Loading of operating system
• CPC Class Codes: G06F 9/44505 Configuring for program initiating, e.g. using registry, configuration files
• CPC Class Codes: G06F 9/45558 Hypervisor-specific management and integration aspects

Abstract

A system and method include creating a bootable virtual machine (VM) image for a container image. The method includes a controller machine creating a single partition within an output VM disk file where the single partition comprises a master boot record and a partition table, forming a valid file system in a main partition of the output VM disk file, arranging an input set of container image definitions as a list where a base image forms a head of the list and subsequent images follow in the list, sequentially processing the list for each image by adding the input set of container image definitions to the output VM file; and applying a final networking configuration over the output VM file.

Claims

1. A method of creating a bootable virtual machine (VM) image for a container image, the method comprising:

creating, at a controller machine, a single partition within an output VM disk file;

forming, at the controller machine, a valid file system for a container image in a main partition of the output VM disk file;

arranging, at the controller machine, an input set of container image definitions as a list, wherein a base image forms a head of the list and subsequent images follow in the list;

processing, at the controller machine, the list for each image by adding the input set of container image definitions to the output VM file; and

applying, at the controller machine, a final networking configuration over the output VM file.

2. The method of claim 1, further comprising checking, at the controller machine, for a presence in the output VM file of protected packages and, if missing, installing missing protected packages in the output VM file.

3. The method of claim 1, wherein processing the list for each image comprises sequentially processing the list.

4. The method of claim 3, further comprising applying transformations, at the controller machine, for operations pertaining to configuration and removal of files.

5. The method of claim 4, wherein operations for networking setup are ignored.

6. The method of claim 1, wherein the single partition comprises a master boot record and a partition table.

7. The method of claim 1, wherein the container image is defined as a first set of transformations applied on top of a first existing image.

8. The method of claim 7, wherein the first existing image is defined as a second set of transformations applied over a second image.

9. The method of claim 8, wherein the container image includes a transformation chain of images having a base image at an end of the transformation chain.

10. The method of claim 9, wherein the base image is defined in terms of a static input set of files having an operations set.

11. An apparatus that creates a bootable virtual machine (VM) image from a container image, the apparatus comprising:

a controller; and

a memory coupled to the controller, wherein the memory stores programmed instructions and an output VM disk file;

wherein the controller includes programmed instructions to;

create a single partition within the output VM disk file;

form a valid file system in a main partition of the output VM disk file;

arrange an input set of container image definitions as a list, wherein a base image forms a head of the list and subsequent images follow in the list;

process the list for each image by adding the input set of container image definitions to the output VM file; and

apply a final networking configuration over the output VM file.

12. The apparatus of claim 11, wherein the controller further includes programmed instructions to check for a presence in the output VM file of protected packages and, if missing, install missing protected packages in the output VM file.

13. The apparatus of claim 11, wherein processing the list for each image comprises sequentially processing the list.

14. The apparatus of claim 13, wherein the controller further includes programmed instructions to apply transformations, at the controller machine, for operations pertaining to configuration and removal of files.

15. The apparatus of claim 11, wherein the single partition comprises a master boot record and a partition table.

16. The apparatus of claim 11, wherein the container image is defined as a first set of transformations applied on top of a first existing image.

17. The apparatus of claim 16, wherein the first existing image is defined as a second set of transformations applied over a second image.

18. The apparatus of claim 17, wherein the container image includes a transformation chain of images having a base image at an end of the transformation chain.

19. The apparatus of claim 18, wherein the base image is defined in terms of a static input set of files having an operations set.

20. A non-transitory computer readable storage medium to store a computer program configured to execute a method for creating a bootable virtual machine (VM) image from a container image, the method comprising:

creating a single partition within an output VM disk file;

forming a valid file system for a container image in a main partition of the output VM disk file;

arranging an input set of container image definitions as a list, wherein a base image forms a head of the list and subsequent images follow in the list;

processing the list for each image by adding the input set of container image definitions to the output VM file; and

applying a final networking configuration over the output VM file.

21. The non-transitory computer readable storage medium of claim 20, further comprising checking for a presence in the output VM file of protected packages and, if missing, installing missing protected packages in the output VM file.

22. The non-transitory computer readable storage medium of claim 20, wherein processing the list for each image comprises sequentially processing the list.

23. The non-transitory computer readable storage medium of claim 20, further comprising applying transformations, at the controller machine, for operations pertaining to configuration and removal of files.