Virtual machine disk incremental snapshot production method based on cloud platform

Abstract

The invention discloses a virtual machine disk incremental snapshot production method based on a cloud platform. The method comprises the three parts of production of incremental snapshots, storage and management of the incremental snapshots and creation of a virtual machine by use of the snapshots, wherein in the production process of the incremental snapshots, the snapshots are uploaded not through a merging process of a base and a disk, and instead increments of the base are directly uploaded to a glance service; in the glance service, the snapshots of the virtual machine are stored and managed in a tree logic structure; and when it is selected to create the virtual machine from a certain snapshot, converting operation is executed on the incremental snapshot, and the whole incremental snapshot chain is traced backwards, and a complete snapshot file is obtained through merging. Through the method, every time a snapshot is produced for the virtual machine, the step of merging is not performed, and only the most recent incremental data is extracted to serve as the snapshot for uploading. In this way, time expenditure is saved at both the data merging stage and the data uploading stage, and snapshot production efficiency is improved; and the snapshots are stored in an incremental file form on the glance service, so that occupied space is greatly saved, and redundant data is reduced.

Description

technical field [0001] The invention relates to the field of cloud computing, in particular to the optimization of making, storing and using virtual machine disk snapshots in the openstack project. Background technique [0002] The openstack cloud platform has a snapshot function for virtual machine management. The snapshot is used to save the system state of the virtual machine at a certain moment, and it can be restored to this state point later. [0003] For the openstack project, the disk image of the virtual machine is stored on the computing node in the qcow2 file format. The disk image of the virtual machine supports superposition and is actually composed of base+disk. Among them, the disk file is saved in the qcow2 format under the folder named by the UUID of the virtual machine, and its backing file is the base image in the raw format, which is saved in the _base folder at the same level as the virtual machine folder, and the disk only saves the base image. Revise...

AI Technical Summary

Problems solved by technology

On the one hand, the merging process takes a certain amount of time, and it will take a certain amount of time to transfer the merged files to Glance via the network; on the other hand, the merged snapshot repeatedly contains the contents of the base image that Glance has saved, which is a waste of space.

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