Method for offline updating virtual machine images

A method for offline upgrading virtual machine mirror images comprising the following steps:

• (A1) a mirror image security server collecting virtual machine mirror images, and extracting and storing an information of the collected virtual machine mirror images;
• and
• (A2) the mirror image security server executing an upgrade operation of virtual machine mirror images in an offline way based on the information of the collected virtual machine mirror images, wherein:
• the step (A1) further comprises:
• (B1) downloading the virtual machine mirror images periodically from a virtual machine mirror image storage server;
• and
• (B2) executing a following steps for each of the downloaded virtual machine mirror images:
• (1) detecting the virtual machine mirror images to acquire a basic information of the virtual machine mirror images and storing the basic information into a metadata database;
• (2) processing the virtual machine mirror images in a way of software package management associated with the virtual machine mirror images based on the basic information;
• and (3) extracting a software package information of the virtual machine mirror images and storing the software package information into a software package information database;
• and
• the step (A2) comprises:
• executing a following steps for each of the downloaded virtual machine mirror images after the step (B2):
• (1) reading out the associated software package information from the software package information database;
• (2) comparing the software package information which have been read out with an information in an upgrade information database to find out software files to be upgraded, wherein a published patch file being stored in the upgrade information database;
• (3) if the published patched software file corresponding to the software file to be upgraded do not exist in an offline patch database, executing a script analysis and rewriting operation and storing the involved patched software files into the offline patch database, otherwise, finding out the patched software files corresponding to the software files to be upgraded in the offline patch database, and then replacing the corresponding software files in the virtual machine mirror images with the patched software files corresponding to the software files to be upgraded;
• (4) updating the software package information database to ensure the information about the virtual machine mirror images in the software package information database is consistent with a current actual information of the virtual machine mirror images;
• and (5) transmitting the virtual machine mirror images which have been processed by the upgrade operation back to the virtual machine mirror image storage server.