JP7279371B2 - Management server, boot server, network boot system, network boot method, program - Google Patents

Description

The present invention relates to a management server, boot server, network boot system, network boot method, and program.

In Patent Document 1, when a management server holds a boot image corresponding to a boot node connected to a network and receives condition information from a boot server installed in each network, the condition information is specified. It describes that the boot image that is stored in the Patent Document 1 describes a network boot system in which a boot server provides a boot image received from a management server to a boot node, thereby network booting the boot node.

Further, Patent Document 2 discloses a technique of a software development environment management device that manages a development environment that changes by adding, changing, or deleting programs in the process of developing and maintaining a software system. The software development environment management device describes a technique of saving and restoring the program in the development environment at any point in time, and recording the failure resolution history.

WO2010/116473 JP-A-03-271933

By the way, OSs (Operating Systems) and application environments are diversifying, and a large number of computer environments are required for evaluation and verification due to combinations of hardware and software requirements. For example, device drivers for peripheral devices such as headphones, web cameras, and authentication devices exist for each model, and are frequently updated. Therefore, there are a wide variety of combinations of computer environments for evaluating and verifying device drivers for such peripheral devices. Therefore, in the above-mentioned related technology, when evaluating and verifying, the computer environment must be prepared each time according to each requirement, and many manual steps are required, which is time-consuming.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a management server, boot server, network boot system, network boot method, and program that can solve the above problems.

According to the first aspect of the present invention, a management server includes a selection unit for selecting an operating system and an application for a terminal device to be network-booted, boot images corresponding to each operating system, and executable by each operating system. a boot server storing disk data corresponding to each application, and network-booting the terminal device using a boot image corresponding to the selected operating system, and storing disk data corresponding to the selected application as a cache file. and an environment generation processing unit that configures the environment of the application in the terminal device by reading as the environment.

According to the second aspect of the present invention, the boot server stores a boot image storage unit storing boot images corresponding to each operating system, and disk data corresponding to each application executable by each operating system. and the boot image corresponding to the operating system selected by the management server to network-boot the terminal device, and read the disk data corresponding to the application selected by the management server as a cache file. and a control unit that configures the environment of the application in the terminal device.

According to a third aspect of the present invention, a network boot system comprises a management server and a boot server; an environment generation processing unit that transmits an environment generation request indicating a boot image corresponding to the selected operating system and disk data corresponding to the selected application to the boot server, the boot server for each operating system. A boot image storage unit that stores a corresponding boot image, a disk storage unit that stores disk data corresponding to each application executable by each operating system, and the terminal device using the boot image indicated by the environment generation request. and a control unit that configures the environment of the application in the terminal device by network-booting the application and reading the disk data indicated by the environment generation request as a cache file.

According to a fourth aspect of the present invention, a network booting method selects an operating system and an application of a terminal device to be network-booted, and selects a boot image corresponding to each operating system and each executable in each operating system. A boot server storing disk data corresponding to each application causes the terminal device to perform network boot using a boot image corresponding to the selected operating system, and reads disk data corresponding to the selected application as a cache file. It is characterized in that the environment of the application is configured in the terminal device by setting the application.

According to a fifth aspect of the present invention, a program comprises a selection means for selecting an operating system and an application for a terminal device to be network booted, a boot image corresponding to each operating system, and each A boot server storing disk data corresponding to each application executable by the operating system uses a boot image corresponding to the selected operating system to network-boot the terminal device to support the selected application. It is characterized by functioning as environment generating means for configuring the environment of the application in the terminal device by reading the disk data as a cache file.

According to a sixth aspect of the present invention, a network boot method causes a terminal device to network boot with a boot image corresponding to an operating system selected by a management server, and disk data corresponding to an application selected by the management server. is read as a cache file to configure the environment of the application on the terminal device.

According to a seventh aspect of the present invention, the program causes the computer of the boot server to network-boot the terminal device with a boot image corresponding to the operating system selected by the management server, and the application selected by the management server. It is characterized by functioning as control means for configuring the environment of the application in the terminal device by reading the corresponding disk data as a cache file.

According to the present invention, it is possible to reduce the labor and time required to construct a computer environment.

1 is a diagram showing the configuration of a network boot system according to an embodiment of the invention; FIG. 4 is a schematic diagram showing a data structure and data examples of an OS-boot image management table according to an embodiment of the present invention; FIG. 4 is a schematic diagram showing a data structure and data examples of an OS-AP management table according to an embodiment of the present invention; FIG. 4 is a schematic diagram showing the data structure and data examples of an AP-Ver management table according to the embodiment of the present invention; FIG. It is a figure which shows the hardware constitutions of the terminal device by embodiment of this invention. It is a figure which shows the hardware constitutions of the DHCP server by embodiment of this invention. It is a figure which shows the hardware constitutions of the management server by embodiment of this invention. It is a figure which shows the hardware constitutions of the boot server by embodiment of this invention. 4 is a flow chart showing the flow of environment generation processing according to the embodiment of the present invention; 4 is a flow chart showing the flow of network boot processing according to an embodiment of the present invention; 4 is a flow chart showing the flow of differential disk data generation processing according to the embodiment of the present invention; It is a figure which shows the minimum structure of the management server of this invention. 1 is a diagram showing the minimum configuration of a boot server of the present invention; FIG.

Hereinafter, a management server, a boot server, a network boot system, a network boot method, and a program according to one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a network boot system according to this embodiment.
As shown in the figure, the network boot system S1 includes a terminal device 1, a DHCP (Dynamic Host Configuration Protocol) server 2, a management server 3, and a boot server 4. FIG. The network boot system S1 is a system for configuring, developing, evaluating, or verifying, in the terminal device 1, an actual machine environment of device drivers (applications) for peripheral devices such as headphones, web cameras, and authentication devices.

The terminal device 1 is a computer used by an operator to develop, evaluate, or verify device drivers for peripheral devices. The terminal device 1 performs network booting from the boot server 4, and internally configures a computer environment for the device drivers of the peripheral devices. The terminal device 1 includes a boot unit 11 that performs network boot.
The boot unit 11 is a NIC (Network Interface Card) having a ROM (Read Only Memory) in which predetermined software is installed. The boot unit 11 is booted with a boot image instructed by the boot server 4 and configures an application environment by reading cache files from the boot server 4 . The environment is for developing, evaluating or validating applications.

The DHCP server 2 has an allocation unit 21 and a notification unit 22 .
The allocation unit 21 allocates an IP address to the terminal device 1 from an IP (Internet Protocol) address pool.
The notification unit 22 transmits the IP address of the terminal device 1 and the IP address of the boot server 4 allocated by the allocation unit 21 to the terminal device 1 .

The boot server 4 includes a control unit 41 , a boot image storage unit 42 , a disk storage unit 43 , a write file storage unit 44 and a cache file storage unit 45 .
The control unit 41 controls the boot server 4 as a whole. For example, the control unit 41 network-boots the terminal device 1 with the boot image indicated by the environment generation request received from the management server 3, and causes the terminal device 1 to read the difference disk data indicated by the environment generation request as a cache file. Configure the environment for the application. The environment generation request includes information indicating a boot image corresponding to the operating system booted on the terminal device 1, and differential disk data corresponding to the applications and their versions that constitute the environment on the operating system.

The boot image storage unit 42 stores boot images corresponding to each OS. The boot image is an image for network booting in which the corresponding OS is initially installed.
The disk storage unit 43 stores difference disk data indicating the difference for each application and its version. The difference disk data is data for configuring the environment of the application. Differential disk data is read-only.
The write file storage unit 44 stores a write file indicating writing (change) to an application made in the terminal device 1 after network booting.
The cache file storage unit 45 stores a cache file to be read by the terminal device 1 after network booting.

The management server 3 includes a display section 31 , a management database 32 , a selection section 33 , an environment generation processing section 34 , an information input section 35 and a difference disk storage processing section 36 .
The display unit 31 displays a dedicated screen for selecting the computer environment in the terminal device 1. FIG.
The selection unit 33 selects a computer environment in the terminal device 1 on the dedicated screen displayed on the display unit 31 . A computer environment is an OS, an application running on the OS, and a version of the application.

The environment generation processing unit 34 refers to the management database 32 and generates the computer environment selected by the selection unit 33 on the boot server 4 . Specifically, the environment generation processing unit 34 transmits to the boot server 4 an environment generation request indicating the boot image corresponding to the selected operating system, the selected application and the differential disk data corresponding to its version. The environment generation processing unit 34 causes the boot server 4 to network-boot the terminal device 1 using the boot image corresponding to the selected operating system by transmitting the environment generation request. The environment generation processing unit 34 also causes the boot server 4 to read the difference disk data corresponding to the selected application as a cache file, thereby causing the terminal device 1 to configure the environment of the application. The environment generation processing unit 34 also generates a cache file by synthesizing the difference disk data according to the version of the application selected by the selection unit 33 .

The information input unit 35 receives input of storage information regarding storage of a write file indicating writing to an application performed in the terminal device 1 . The save information includes the version display name of the application.
The differential disk storage processing unit 36 stores a write file indicating writing to an application performed in the terminal device 1 as differential disk data of the application in the boot server 4 based on the storage information input to the information input unit 35. .

The management database 32 manages boot images and differential disk data stored in the boot server 4 . The management database 32 includes an OS-boot image management table 321 that associates an OS with a boot image, an OS-AP management table 322 that associates an OS with an application, and an AP-Ver management table that associates an application and its version with differential disk data. A table 323 is stored.

FIG. 2 is a schematic diagram showing the data structure and data examples of the OS-boot image management table according to this embodiment.
The OS-boot image management table 321 stores items of OS name and boot image name in association with each other. The OS name is the name of the OS. The boot image name is the file name of the boot image stored by the boot server 4 . For example, the boot image name corresponding to the OS name "OS1" is "Master1". Also, the boot image name corresponding to the OS name "OS2" is "Master2". Also, the boot image name corresponding to the OS name "OS3" is "master3".

FIG. 3 is a schematic diagram showing the data structure and data examples of the OS-AP management table according to this embodiment.
The OS-AP management table 322 stores the items of the OS name and the application display name in association with each other. The application display name is the name of an application that can be executed on the corresponding OS. For example, applications executable under the OS name "OS1" are "AP1", "AP2" and "AP3". Also, an application executable by the OS name "OS2" is "AP1".

FIG. 4 is a schematic diagram showing the data structure and data examples of the AP-Ver management table according to this embodiment.
The AP-Ver management table 323 stores the items of application display name, version display name, and difference disk name in association with each other. The version display name is the name of the version of the corresponding application. The difference disk name is the file name of the difference disk data stored by the boot server 4 . For example, the difference disk name corresponding to the version display name "Ver1" of the application display name "AP1" is "Ap11-d1". Also, the difference disk name corresponding to the version display name "Ver2" of the application display name "AP1" is "Ap11-d2". Also, the difference disk name corresponding to the version display name "Ver3" of the application display name "AP1" is "Ap11-d3". Also, the difference disk name corresponding to the version display name "Ver1" of the application display name "AP2" is "Ap12-d1".

FIG. 5 is a diagram showing the hardware configuration of the terminal device according to this embodiment.
As shown in this figure, the terminal device 1 includes hardware such as a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, a mass storage device 104, and a communication module 105. computer.

FIG. 6 is a diagram showing the hardware configuration of the DHCP server according to this embodiment.
As shown in this figure, the DHCP server 2 includes hardware such as a CPU (Central Processing Unit) 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, a mass storage device 204, and a communication module 205. computer.

FIG. 7 is a diagram showing the hardware configuration of the management server according to this embodiment.
As shown in this figure, the management server 3 includes hardware such as a CPU (Central Processing Unit) 301, a ROM (Read Only Memory) 302, a RAM (Random Access Memory) 303, a mass storage device 304, and a communication module 305. computer.

FIG. 8 is a diagram showing the hardware configuration of the boot server according to this embodiment.
As shown in this figure, the boot server 4 includes hardware such as a CPU (Central Processing Unit) 401, a ROM (Read Only Memory) 402, a RAM (Random Access Memory) 403, a mass storage device 404, and a communication module 405. computer.

The DHCP server 2, management server 3, and boot server 4 may be composed of a plurality of computers.

FIG. 9 is a flowchart showing the flow of environment generation processing according to this embodiment.
The environment generation processing is processing for generating a computer environment (OS and applications) that the terminal device 1 starts up by network booting.

First, the operator activates a dedicated screen on the management server 3 . The selection unit 33 of the management server 3 displays a dedicated screen on the display unit 31 (step S101). Subsequently, the selection unit 33 acquires the OS names from the OS-boot image management table 321 stored in the management database 32, and displays a selectable list on the dedicated screen (step S102).

The operator selects an OS to be booted on the terminal device 1 from the OS names displayed on the dedicated screen. The selection unit 33 receives an OS selection input on the dedicated screen (step S103). Next, the selection unit 33 refers to the OS-AP management table 322, acquires the application display name corresponding to the selected OS, and displays a selectable list on the dedicated screen (step S104).

The worker selects an application to be executed on the terminal device 1 from the application display name displayed on the dedicated screen. The selection unit 33 receives an application selection input on the dedicated screen (step S105). Next, the selection unit 33 refers to the AP-Version management table 323, acquires the version display name corresponding to the selected application, and displays a selectable list on the dedicated screen (step S106).

The operator selects the version of the application to be executed on the terminal device 1 from the version display name of the application displayed on the dedicated screen. The selection unit 33 receives an application version selection input on the dedicated screen (step S107).

The environment generation processing unit 34 acquires the boot image name corresponding to the selected OS name from the OS-boot image management table 321. FIG. Also, the environment generation processing unit 34 acquires the difference disk name corresponding to the selected application display name and version display name from the AP-Ver management table 323 . At this time, if the selected version has a previous version, the environment generation processing unit 34 also acquires the difference disk names of all the previous versions. For example, when the version display name “Ver3” of the application display name “AP1” is selected, the environment generation processing unit 34 selects the difference disk names “Ap11-d1”, “Ap11” of “AP1” up to “Ver3”. -d2” and “Ap11-d3”. The environment generation processing unit 34 then transmits the environment generation request to the boot server 4 (step S108). The environment generation request includes the obtained boot image name and difference disk name.

Upon receiving the environment generation request, the control unit 41 of the boot server 4 identifies the boot image of the boot image name included in the received environment generation request as the boot image for the network boot of the terminal device 1 . Further, the control unit 41 reads from the disk storage unit 43 all the difference disk data of the difference disk name included in the received environment generation request. Subsequently, the control unit 41 synthesizes all the read differential disk data, and writes the synthesized differential disk data to the cache file storage unit 45 as a network boot cache file (step S109). After that, the control unit 41 transmits a completion notification to the management server 3 (step S110). When the environment generation processing unit 34 of the management server 3 receives the notification of completion, it displays that the generation of the computer environment is completed on the dedicated screen (step S111).

FIG. 10 is a flowchart showing the flow of network boot processing according to this embodiment.
The network boot process is a process of network booting the terminal device 1 in the computer environment generated in the environment generation process described above.

First, the worker activates the terminal device 1 . When the terminal device 1 is activated, the boot unit 11 transmits an IP request requesting an IP address to the DHCP server 2 (step S201). The allocation unit 21 of the DHCP server 2 allocates an IP address in the IP address pool to the terminal device 1 . Then, the notification unit 22 of the DHCP server 2 returns the assigned IP address and the IP address of the boot server 4 to the terminal device 1 (step S202).

The boot unit 11 of the terminal device 1 requests the boot image from the boot server 4 using the received IP address of the boot server 4 (step S203). The control unit 41 of the boot server 4 notifies the terminal device 1 of the boot image of the boot image name included in the environment generation request (step S204). The boot unit 11 of the terminal device 1 is booted from the notified boot image (step S205).

After booting from the boot image, the boot unit 11 of the terminal device 1 reads the difference file stored in the cache file storage unit 45 of the boot server 4 as a cache file, and configures the application environment (step S206).

Subsequently, the boot unit 11 determines whether or not there is writing to the application (step S207). If there is no writing (step S207; No), the process proceeds to step S209. On the other hand, if there is a write to the application (step S207; Yes), the boot unit 11 saves the write file indicating the write in the write file storage unit 44 of the boot server 4 (step S208).

The boot unit 11 determines whether or not to end the network boot (step S209). For example, the boot unit 11 determines to end the network boot when there is an operation input to stop the terminal device 1 . If not finished (step S209; No), the process returns to step S207. On the other hand, when ending (step S209; Yes), the boot unit 11 ends the network boot and stops the terminal device 1 (step S210).

When the terminal device 1 finishes network booting, the controller 41 of the boot server 4 deletes the write file stored in the write file storage unit 44 (step S211).

FIG. 11 is a flowchart showing the flow of differential disk data generation processing according to this embodiment.
The difference disk data generation process is a process of generating new difference disk data from the write file saved in step S208 described above. The difference disk data generation process shown in this figure is executed between steps S208 and S210 described above (between when the write file is saved and when it is deleted).

The operator performs an operation for generating new differential disk data from the dedicated screen, and inputs the version display name of the newly created differential disk data. The information input unit 35 receives an input of the version display name of the differential disk data to be newly created from the dedicated screen (step S301).

The difference disk storage processing unit 36 transmits a new difference disk generation request for generating new difference disk data to the boot server 4 (step S302). Upon receiving the new difference disk generation request, the control unit 41 of the boot server 4 generates a write file stored in the write file storage unit 44 as new difference disk data (step S303). Specifically, the control unit 41 changes the file name of the write file and writes it to the disk storage unit 43 as differential disk data. After that, the control unit 41 transmits a completion notice including the changed file name to the management server 3 (step S304).

When receiving the completion notification, the difference disk storage processing unit 36 of the management server 3 associates the file name included in the completion notification with the input version display name, and stores the AP-Version management table 323 in the management database 32. (step S305).

Thus, the network boot system S1 according to this embodiment includes the management server 3 and the boot server 4. FIG. The management server 3 has a selection unit 33 for selecting an operating system and an application for the terminal device 1 to be network-booted, and a boot environment generation request indicating a boot image corresponding to the selected operating system and disk data corresponding to the selected application. and an environment generation processing unit 34 that transmits to the server 4 . The boot server 4 includes a boot image storage unit 42 for storing boot images corresponding to each operating system, a disk storage unit 43 for storing differential disk data corresponding to each application executable by each operating system, and an environment A control unit 41 for network booting the terminal device 1 using the boot image indicated by the generation request and reading the disk data indicated by the environment generation request as a cache file.

With such a configuration, an operator can construct a desired computer environment simply by selecting an OS and an application in the management server 3 and activating the terminal device 1 . Therefore, it is possible to simplify the work procedure by omitting simple work each time, such as installation of the OS and applications, which used to take much of the verification time. In other words, it is possible to reduce the labor, time, and cost required for preparations for constructing a computer environment and improve efficiency.

Further, the disk storage unit 43 stores difference disk data indicating the difference for each application version, and the environment generation processing unit 34 generates a cache file by synthesizing the difference disk data according to the selected application version. . With such a configuration, it is possible to reduce the storage capacity while supporting an application environment with a large number of variations, and it is possible to roll back to an arbitrary point at which the differential disk data was acquired and to use it for debugging purposes. For example, when verification fails or when verification in the same computer environment is required repeatedly, building a computer environment from scratch takes a huge amount of time and effort, but with the above configuration, the computer environment can be quickly restored at a fixed point. becomes possible.

The management server 3 also includes a differential disk storage processing unit 36 that stores a write file indicating writing to an application performed in the terminal device 1 in the boot server 4 as differential disk data of the application. With such a configuration, changes made to the application in the terminal device 1 can be saved as a difference file of the next version. This makes it possible to easily build a computer environment to which this change is applied from the next time.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

For example, in the above-described embodiment, the management server 3 and boot server 4 are described as separate devices, but the management server 3 and boot server 4 may be configured as one device. For example, the boot server 4 may have the functions of the management server 3 .

FIG. 12 is a diagram showing the minimum configuration of the management server.
The management server 3 should have at least the functions of the selection unit 33 and the environment generation processing unit 34 .
The selection unit 33 selects the operating system and application of the terminal device 1 that performs network boot.
The environment generation processing unit 34 stores the boot image corresponding to each operating system and the disk data corresponding to each application executable by each operating system in the boot server 4, which stores the boot image corresponding to the selected operating system. is used to cause the terminal device 1 to network boot, and the disk data corresponding to the selected application is read as a cache file, thereby configuring the environment of the application on the terminal device 1 .

FIG. 13 is a diagram showing the minimum configuration of the boot server.
The boot server 4 should have at least the functions of the control unit 41 , the boot image storage unit 42 and the disk storage unit 43 .
The control unit 41 network-boots the terminal device with a boot image corresponding to the operating system selected by the management server 3, and loads the disk data corresponding to the application selected by the management server 3 as a cache file. to configure the environment for the application.
The boot image storage unit 42 stores boot images corresponding to each operating system.
The disk storage unit 43 stores disk data corresponding to each application executable by each operating system.

Each of the devices described above has an internal computer system. Each process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by reading and executing this program by a computer. Here, the computer-readable recording medium refers to magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like. Alternatively, the computer program may be distributed to a computer via a communication line, and the computer receiving the distribution may execute the program.

Further, the program may be for realizing part of the functions described above. Further, it may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

S1: network boot system 1: terminal device 11: boot unit 2: DHCP server 21: assignment unit 22: notification unit 3: management server 31: display unit 32 Management database 33 Selection unit 34 Environment generation processing unit 35 Information input unit 36 Differential disk storage processing unit 4 Boot server 41 Control unit 42 Boot image storage unit 43 Disk storage unit 44 Write file storage unit 45 Cache file storage unit

Claims (9)

a selection unit that selects an operating system and an application of a terminal device that performs network boot;
a boot server that stores boot images corresponding to each operating system and differential disk data corresponding to each application executable on each operating system and showing difference between versions of the applications; The terminal device is network-booted using a boot image corresponding to the selected operating system, a cache file is generated by synthesizing the differential disk data according to the selected application version , and the cache file is transferred to the terminal device. an environment generation processing unit that configures the environment of the application in the terminal device by reading it;
A management server with a differential disk storage processing unit that stores a write file indicating writing to the application performed in the terminal device as differential disk data of the application in the boot server;
The management server of claim 1 , comprising: 3. The management server according to claim 1, wherein said environment is for developing, evaluating or verifying said application. a boot image storage unit that stores boot images corresponding to each operating system;
a disk storage unit for storing difference disk data, which is disk data corresponding to each application executable by each operating system and indicates a difference between versions of the applications ;
Network-booting a terminal device with the boot image corresponding to the operating system selected by the management server, generating a cache file by synthesizing the differential disk data according to the version of the application selected by the management server, and generating the cache file a control unit that configures the environment of the application on the terminal device by causing the terminal device to read a file ;
A boot server with comprising a management server and a boot server,
The management server is
a selection unit that selects an operating system and an application of a terminal device that performs network boot;
an environment generation processing unit that transmits an environment generation request indicating a boot image corresponding to the selected operating system and disk data corresponding to the selected application to the boot server;
with
The boot server is
a boot image storage unit that stores boot images corresponding to each operating system;
a disk storage unit for storing difference disk data, which is disk data corresponding to each application executable by each operating system and indicates a difference between versions of the applications ;
network booting the terminal device using the boot image indicated by the environment generation request, generating a cache file by synthesizing the differential disk data according to the version of the selected application indicated by the environment generation request, and generating the cache file; a control unit that configures the environment of the application on the terminal device by reading into the terminal device ;
A network boot system with Selecting the operating system and application of the terminal device for network booting,
a boot server that stores boot images corresponding to each operating system and differential disk data corresponding to each application executable on each operating system and showing difference between versions of the applications; The terminal device is network-booted using a boot image corresponding to the selected operating system, a cache file is generated by synthesizing the differential disk data according to the selected application version , and the cache file is transferred to the terminal device. causing the terminal device to configure the environment of the application by loading
Network boot method. the management server computer,
a selection means for selecting an operating system and an application for a terminal device for network booting;
a boot server that stores boot images corresponding to each operating system and differential disk data corresponding to each application executable on each operating system and showing difference between versions of the applications; The terminal device is network-booted using a boot image corresponding to the selected operating system, a cache file is generated by synthesizing the differential disk data according to the selected application version , and the cache file is transferred to the terminal device. an environment generating means for configuring the environment of the application on the terminal device by reading the
A program that acts as a storing a boot image corresponding to each operating system and difference disk data corresponding to each application executable by each operating system and indicating a difference for each version of the application;
Network-booting a terminal device with the boot image corresponding to the operating system selected by the management server, generating a cache file by synthesizing the differential disk data according to the version of the application selected by the management server, and generating the cache file causing the terminal device to configure the environment of the application by causing the terminal device to read the file ;
Network boot method. A boot server computer that stores boot images corresponding to each operating system, and disk data corresponding to each application executable on each operating system and difference disk data indicating differences between versions of the applications. ,
Network-booting a terminal device with the boot image corresponding to the operating system selected by the management server, generating a cache file by synthesizing the differential disk data according to the version of the application selected by the management server, and generating the cache file a control means for causing the terminal device to configure the environment of the application by causing the terminal device to read a file ;
A program that acts as a

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