Information processing system, information processing method, and server

An information processing method comprising:

• building, in processing circuitry, a virtualized image file from a base image file used as a base for an image file to be virtualized, based on a description included in a building instruction setting file;
• associating the virtualized image file having been built with the base image file and the building instruction setting file and storing the virtualized image file in a memory;
• determining a combination of a base image file and a building instruction setting file, the combination being input, with another combination of the base image file and the building instruction setting file, the other combination being stored in the memory, to determine whether both combinations match;
• and
• when determining that both combinations match, reusing the virtualized image file, based on information on the virtualized image file.

A non-transitory computer readable medium storing therein a program which, when executed by a processor of a computer performs a method comprising:

• building a virtualized image file from a base image file used as a base for an image file to be virtualized, based on a description included in a building instruction setting file;
• associating the virtualized image file having been built with the base image file and the building instruction setting file and store the virtualized image file in a memory;
• determining a combination of a base image file and a building instruction setting file, the combination being input, with another combination of the base image file and the building instruction setting file, the other combination being stored in the memory, to determine whether both combinations match;
• and
• when determining that both combinations match, reusing the virtualized image file, based on information on the virtualized image file, wherein.