CN109656679B - A storage access method and device for a virtual machine - Google Patents

Abstract

The present application provides a storage access method and device for a virtual machine, wherein a server logs in to a storage service of a network disk allocated for the virtual machine and obtains an identifier of the network disk, and creates an identifier with the network disk for the virtual machine based on the network disk. virtual disk. After that, the virtual machine logs in to the storage service of the network disk after starting the operating system based on the virtual disk, and then determines the storage access path of the virtual machine based on the identifier shared by the network disk and the virtual disk, including the access path of the network disk and the access path of the virtual disk. The access path of the virtual disk is the primary path, and the access path of the network disk is the secondary path. After that, the virtual machine switches the access path of the network disk to the primary path after detecting that the server logs out of the storage service of the network disk. Therefore, only a small amount of server resources can be occupied to access the virtual disk during the startup phase of the virtual machine, and the virtual machine can directly access the network disk after the virtual machine is started.

Description

A storage access method and device for a virtual machine

technical field

The present application relates to the field of storage technologies, and in particular, to a storage access method and device for a virtual machine.

Background technique

In a virtualized environment, there are generally two types of disks that can be used by virtual machines: one is virtual disk and the other is network disk. Currently, every time a virtual machine accesses a virtual disk, it needs to establish a communication connection with the server through a virtual network card, and then the server accesses the corresponding virtual disk. The above access process requires the help of a server to access the virtual disk, the access path is long, and more server resources are occupied. In order to shorten the access path and reduce the occupation of server resources, the virtual machine can directly log in to the storage service of the network disk to access the network disk. Specifically, the virtual machine can log in to the storage service of the network disk through the Storage Area Network (SAN) during the basic input output system (Basic Input Output System, BIOS) startup phase, and then access the network disk and start from the network disk BIOS.

However, the way the virtual machine accesses the network disk is affected by the technical specifications of the BIOS, and the network storage protocols that can be supported are limited, and are only applicable to the Internet Small Computer System Interface (iSCSI), Fibre Channel (FC) ) and other protocols, it is not applicable to some new network storage technologies, and the scalability is poor.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present application is to provide a storage access method and device for a virtual machine, which can only occupy a small amount of server resources to access the virtual disk during the startup phase of the virtual machine. After the virtual machine is started, the virtual machine directly accesses the network disk. , the application range is wider and the scalability is better.

In a first aspect, the present application provides a storage access method for a virtual machine, which is applied to a server where a virtual machine is created, and the method includes:

Log in to the storage service of the network disk allocated for the virtual machine and obtain the identifier of the network disk;

creating a virtual disk for the virtual machine with an identifier of the network disk based on the network disk;

After determining that the virtual machine starts the operating system based on the virtual disk, instruct the virtual machine to log in to the storage service of the network disk; wherein, the storage access path after the virtual machine logs in to the storage service of the network disk Including the access path of the network disk and the access path of the virtual disk, the access path of the virtual disk is the primary path, and the access path of the network disk is the backup path;

Log out of the storage service of the network disk, so that the virtual machine switches the access path of the network disk to the main path.

In a possible implementation manner, the logging in to the storage service of the network disk allocated for the virtual machine includes:

Obtain the Internet Protocol IP address of the network disk and the name of the network disk, and log in to the storage service of the network disk based on the IP address and the name.

In a possible implementation manner, the creating a virtual disk with an identifier of the network disk for the virtual machine based on the network disk includes:

creating the virtual disk with a temporary identifier in the network disk;

Modify the temporary identifier of the virtual disk to the identifier of the network disk.

In a possible implementation manner, the logging out of the storage service of the network disk includes:

After receiving the uninstall instruction sent by the virtual machine for instructing to uninstall the network disk, log out the storage service of the network disk based on the IP address of the network disk and the name of the network disk.

In a possible implementation manner, after logging out of the storage service of the network disk, the method further includes:

Delete the configuration information of the virtual disk.

In a second aspect, the present application provides a storage access method for a virtual machine, which is applied to a virtual machine created on a server, and the method includes:

Start the operating system of the virtual machine based on the virtual disk; wherein, the virtual disk is created by the server for the virtual machine based on a network disk, and the identifier of the network disk is consistent with the identifier of the virtual disk;

Log in to the storage service of the network disk under the instruction of the server;

Based on the identifier shared by the network disk and the virtual disk, it is determined that the storage access path of the virtual machine includes an access path of the network disk and an access path of the virtual disk; The access path is the primary path, and the access path of the network disk is the backup path;

After detecting that the server logs out of the storage service of the network disk, the access path of the network disk is switched to the main path.

In a possible implementation manner, the determining of the storage access path of the virtual machine based on the identifier shared by the network disk and the virtual disk includes an access path of the network disk and an access path of the virtual disk. Access paths, including:

When it is recognized that the network disk and the virtual disk share the identifier, by starting the multi-path service, the access path of the virtual disk is determined as the primary path, and the access path of the network disk is determined as the backup path .

In a fourth aspect, the present application provides a storage access device for a virtual machine, the device comprising:

an obtaining module, configured to log in to the storage service of the network disk allocated for the virtual machine and obtain the identifier of the network disk;

A creation module, configured to create a virtual disk with the identifier of the network disk for the virtual machine based on the network disk;

an instructing module, configured to instruct the virtual machine to log in to the storage service of the network disk after determining that the virtual machine starts the operating system based on the virtual disk; wherein the virtual machine logs in to the storage service of the network disk The latter storage access path includes the access path of the network disk and the access path of the virtual disk, the access path of the virtual disk is the primary path, and the access path of the network disk is the backup path;

The uninstallation module is configured to log out of the storage service of the network disk, so that the virtual machine switches the access path of the network disk to the main path.

In a possible design, when the acquisition module logs in to the storage service of the network disk allocated for the virtual machine, it is specifically used to:

Obtain the Internet Protocol IP address of the network disk and the name of the network disk, and log in to the storage service of the network disk based on the IP address and the name.

In a possible design, when the creation module creates a virtual disk with the identifier of the network disk for the virtual machine based on the network disk, it is specifically used for:

creating the virtual disk with a temporary identifier in the network disk;

Modify the temporary identifier of the virtual disk to the identifier of the network disk.

In a possible design, when the unloading module logs out of the storage service of the network disk, it is specifically used to:

After receiving the uninstall instruction sent by the virtual machine for instructing to uninstall the network disk, log out the storage service of the network disk based on the IP address of the network disk and the name of the network disk.

In a possible design, after logging out of the storage service of the network disk, the unloading module is further configured to:

Delete the configuration information of the virtual disk.

In a fourth aspect, the present application further provides a storage access device for a virtual machine, the device comprising:

a startup module, configured to start the operating system of the virtual machine based on the virtual disk; wherein the virtual disk is created by the server for the device based on the network disk, and the identifier of the network disk and the virtual disk consistent;

a connection module, used for logging in the storage service of the network disk under the instruction of the server;

a determining module, configured to determine, based on the identifier shared by the network disk and the virtual disk, that the storage access path of the virtual machine includes the access path of the network disk and the access path of the virtual disk; wherein, The access path of the virtual disk is the primary path, and the access path of the network disk is the backup path;

The switching module is configured to switch the access path of the network disk to the main path after detecting that the server logs out of the storage service of the network disk.

In a possible design, the determining module determines, based on the identifier shared by the network disk and the virtual disk, that the storage access path of the virtual machine includes the access path of the network disk and the virtual disk. When the access path of the disk is used, it is specifically used for:

When it is recognized that the network disk and the virtual disk share the identifier, by starting the multi-path service, the access path of the virtual disk is determined as the primary path, and the access path of the network disk is determined as the backup path .

In a fifth aspect, embodiments of the present application further provide an electronic device, including: a processor, a memory, and a bus, where the memory stores machine-readable instructions executable by the processor, and when the electronic device runs, the processing A bus communicates between the processor and the memory, and when the machine-readable instructions are executed by the processor, the first aspect or the storage access method for a virtual machine in any possible implementation manner of the first aspect is performed. step.

In a sixth aspect, embodiments of the present application further provide an electronic device, including: a processor, a memory, and a bus, where the memory stores machine-readable instructions executable by the processor, and when the electronic device runs, the processing A bus communicates between the processor and the memory, and when the machine-readable instructions are executed by the processor, the second aspect or the storage access method for a virtual machine in any possible implementation manner of the second aspect is performed. step.

In a seventh aspect, an embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and the computer program is executed by a processor to execute the first aspect, or any of the first aspect. The steps of the storage access method for a virtual machine in a possible implementation manner, or the steps of the second aspect or the storage access method for a virtual machine in any possible implementation manner of the second aspect are performed.

In this embodiment of the present application, the server may log in to the storage service of the network disk allocated for the virtual machine and obtain the identifier of the network disk, and then create a virtual disk with the identifier of the network disk for the virtual machine based on the network disk. In this way, the virtual machine can The virtual disk is accessed through a server. After the virtual machine boots the operating system based on the virtual disk, the server may instruct the virtual machine to log in to the connection to the network disk. Further, after the virtual machine is connected to the network disk, by identifying that the identifier of the network disk is consistent with the identifier of the virtual disk accessed before, it can be determined that the storage access path accessing the same storage space can be the access path of the virtual disk, It can also be the access path of the network disk, and then the access path of the virtual disk can be used as the primary path, and the access path of the network disk can be used as the backup path. Then, after the server logs out of the storage service of the network disk, the virtual machine cannot access the virtual disk with the help of the server normally, and the access path of the virtual disk fails, and the virtual machine can switch the access path of the network disk to the main path. The virtual machine accesses the network disk directly.

Through the above solution, only a small amount of server resources can be occupied to access the virtual disk during the startup phase of the virtual machine. After the virtual machine is started, the virtual machine can directly log in to the storage service of the network disk, and then access the access path of the virtual disk and the network disk. The path forms the primary and secondary paths, and after the server logs out of the storage service of the network disk, the virtual machine cannot use the server to access the virtual disk normally. The path is used as the main path, so as to achieve the purpose of directly accessing the network disk without occupying server resources.

Moreover, since the way that the virtual machine logs into the storage service of the network disk is performed after the virtual machine successfully starts the operating system, compared with the prior art based on a specific network storage protocol in the process of starting the operating system of the virtual machine through the SAN network. In the process of logging in to the storage service of the network disk, this solution does not depend on the technical specifications of the operating system of the virtual machine, nor is it limited by several specific network protocols, and has a wide range of applications and good scalability.

In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 shows a schematic diagram of a possible system architecture provided by an embodiment of the present application;

FIG. 2 shows a schematic flowchart of a storage access method for a virtual machine provided by an embodiment of the present application;

FIG. 3 shows a schematic structural diagram of a storage access device 30 for a virtual machine provided by an embodiment of the present application;

FIG. 4 shows a schematic structural diagram of a storage access device 40 for a virtual machine provided by an embodiment of the present application;

FIG. 5 shows a schematic structural diagram of an electronic device provided by an embodiment of the application.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

In a virtualized environment, there are two types of disks that can be used by virtual machines, one is virtual disk and the other is network disk. The virtual disk may be understood as a file or block device on a file system created on a server or other storage device. A network disk can be understood as a storage medium allocated to a virtual machine in a remote storage device deployed in a SAN. The virtual disk of the virtual machine is usually used as a system disk, and the operating system of the virtual machine and the relevant parameters of the operating system are usually stored on the system disk. The network disk of the virtual machine is usually used as the data disk of the virtual machine, and various application data of the virtual machine can usually be stored on the data disk, such as various application data generated by using the application program on the virtual machine.

Since the virtual machine needs to rely on the server every time it accesses the virtual disk, the problems of long access path, slow access speed and more server resources are required. In order to overcome the above problems, it is currently proposed that the network disk can be used as both a system disk and a data disk, so that the virtual machine can directly access the network disk. In the existing implementation method, during the startup process of the virtual machine, the storage service of the network disk is logged in through the SAN, so that the virtual machine can access the network disk and start the BIOS from the network disk. The supported network storage protocols are limited, and it is difficult to apply to some new network storage technologies, resulting in limited application scope and poor scalability.

In view of the above situation, the present application provides a storage access method and device for a virtual machine, which can realize that the virtual machine directly accesses a network disk. First, a schematic diagram of a system architecture applicable to the embodiments of the present application is introduced. Referring to FIG. 1 , the system includes a server, a virtual machine created on the server, and a storage device. The storage device can be configured in the cloud, and a part of the storage space is pre-divided in the storage device for use by the virtual machine. This part of the storage space is used as the network disk of the virtual machine, and this part of the storage space can use the logical unit number , lun) to identify.

In the technical solution provided by the present application, the server can log in to the storage service of the network disk, and create a virtual disk for the virtual machine based on the network disk. While the virtual machine is in the boot phase, the server can access the virtual disk to start the operating system. Among them, since the virtual disk is created on the network disk, the process of the virtual machine accessing the virtual disk through the server is equivalent to the virtual machine accessing the network disk through the virtual disk. Further, after the virtual machine starts the operating system, it can log in to the storage service of the network disk under the instruction of the server, and then by starting the multi-path service, the access path of the virtual disk and the access path of the network disk form the primary and secondary paths, so that the virtual The computer can support both access to virtual disk and access to network disk at the same time. Further, after the virtual machine starts the multi-pathing service, it can also instruct the server to unload the virtual disk, so as to cut off the path for accessing the virtual disk in the multi-pathing service, so that the access path of the network disk is switched to the main path, and finally the virtual machine can access the network disk. the goal of.

Hereinafter, the storage access mode of the virtual machine provided by the present application will be described in detail with reference to specific embodiments.

Referring to FIG. 2, which is a schematic flowchart of a storage access method for a virtual machine provided by an embodiment of the present application, the schematic diagram describes a specific interaction process between a server and a virtual machine, so that the virtual machine can directly access a network disk. The specific interaction process is as follows:

Step 201: The server logs in to the storage service of the network disk allocated to the virtual machine and obtains the identifier of the network disk.

In a specific implementation, the server may obtain configuration parameters of the network disk allocated to the virtual machine, where the configuration parameters are, for example, the name of the network disk and the IP address of the network disk. The acquisition method is, for example, receiving an instruction carrying configuration parameters input by other devices or users, and the like. After that, the server can log in to the storage service of the network disk based on the IP address of the network disk and the name of the network disk, and after logging in to the storage service of the network disk, identify the identifier of the network disk. The identifier of the network disk is, for example, a world wide identifier (wwid).

Step 202: The server creates a virtual disk with an identifier of the network disk based on the network disk.

In a specific implementation, when the server creates a virtual disk for a virtual machine based on a network disk, the type, driver and source path of the virtual disk can be configured. Among them, the type of the virtual disk can be a file or a block device; the driver of the virtual machine can be configured according to the specific virtualization environment; the source path of the virtual machine can be based on the name of the network disk, the IP address and the logical unit number corresponding to the storage space. to generate.

In a possible implementation manner, during the process of creating the virtual disk, the server may assign a temporary identifier to the virtual disk, and the assignment of the temporary identifier may be random, or may be assigned according to a preset rule. After the virtual disk with the temporary identifier is created, since the source path of the virtual disk actually points to the storage space corresponding to the network disk, that is to say, the virtual disk and the network disk occupy the same storage space, the temporary The identifier is modified to the identifier of the network disk in order to associate the virtual disk with the network disk.

In another possible implementation manner, after the server recognizes the identifier of the network disk, since the network disk and the virtual disk occupy the same storage space, the identifier of the created virtual disk can be directly configured as the identifier of the network disk, in order to associate the virtual disk with the network disk.

Step 203: The virtual machine starts the operating system based on the created virtual disk.

In this embodiment of the present application, after the server creates a virtual disk for the virtual machine, the virtual machine can perceive that the virtual disk can be used, so the virtual machine can start the operating system by accessing the virtual disk. Among them, this access process requires the participation of the server. Specifically, the server accesses the virtual disk on the network disk based on the storage service of the network disk, and then the server notifies the virtual machine of the operating system read from the virtual disk. , so that the virtual machine starts the operating system.

Step 204: After determining that the virtual machine starts the operating system, the server instructs the virtual machine to log in to the storage service of the network disk.

In a specific implementation, after the virtual machine successfully starts the operating system, it may send a notification message that the virtual machine has been started to the server, and the server may determine that the virtual machine is started after receiving the notification message. Further, the server may deliver configuration parameters of the network disk to the virtual machine, including, for example, the name and IP address of the network disk, so as to instruct the virtual machine to log in to the storage service of the network disk.

Step 205: After the virtual machine logs in to the storage service of the network disk, based on the identifier shared by the network disk and the virtual disk, determine that the storage access path of the virtual machine includes the access path of the network disk and the access path of the virtual disk.

In a specific implementation, the virtual machine may log in to the storage service of the network disk based on the IP address of the network disk and the name of the network disk. After the virtual machine successfully logs in to the storage service of the network disk, it can recognize the identifier of the network disk, and the virtual machine can also recognize the identifier of the virtual disk when accessing the virtual disk before, because the server is creating the virtual disk for the virtual machine. During the process, the identifier of the virtual disk and the identifier of the network disk have been configured to be the same, so the virtual machine can recognize that the network disk and the virtual disk share the same identifier. And because sharing the same identifier actually means that the network disk and the virtual disk share the same storage space, the virtual machine can determine that there are two storage access paths for the same storage space, one is the access path of the virtual disk, and the other is the access path of the virtual disk. is the access path of the network disk.

In this embodiment of the present application, the virtual machine may start the multi-path service, so as to allow the use of the above two storage access paths. Among them, since the virtual machine has accessed the virtual disk before, the access path of the virtual disk can be used as the primary path, and the virtual machine has not accessed the network disk, so the access path of the network disk is used as the backup path. In addition, when the virtual machine starts the multi-path service, the fault policy can also be configured as high availability. In this way, when one of the two storage access paths forming the active and standby paths fails, the storage access path can be switched to on the normal storage access path.

Considering that the access path of the virtual disk needs to depend on the server, if the access path of the virtual disk is always allowed, on the one hand, the access path is long, which is not conducive to improving the access efficiency, and on the other hand, it also occupies the resources of the server, which increases the The processing pressure of the server, so in the embodiment of the present application, after the virtual machine successfully starts the multi-path service and confirms that the storage access path for directly accessing the network disk is available, it can send an uninstall instruction to the server to instruct the server to uninstall the network disk. Among them, the purpose of uninstalling the network disk is to prevent the server from logging into the storage service of the network disk normally. Since the virtual machine needs to use the server to connect to the network disk to access the virtual disk when accessing the virtual disk, if the server cannot log in to the storage service of the network disk normally , then the virtual machine cannot access the virtual disk normally, and the virtual machine can determine that the access path of the virtual disk is faulty, and then switch the primary and secondary paths to switch the storage access path to the access path of the network disk.

Step 206, the server logs out the storage service of the network disk.

In a specific implementation, after receiving the uninstall instruction sent by the virtual machine, the server can look up the configuration parameters of the network disk corresponding to the virtual machine, and then log out of the storage service of the network disk based on the IP address of the network disk and the name of the network disk.

Step 207: After the virtual machine detects that the server logs out of the storage service of the network disk, the virtual machine uses the access path of the network disk as the main path.

Since the server logs out of the storage service of the network disk, the path that relies on the server to access the virtual disk cannot be used. After the virtual machine detects that the access path of the virtual disk cannot be used, it can actively switch the active and standby paths to switch the access path of the network disk. As the primary path, subsequent virtual machines can directly use the access path of the network disk to communicate with the network disk.

In addition, in a possible implementation manner, after the server logs out of the storage service of the network disk, since the virtual disk cannot be accessed, the configuration information about the virtual disk may also be deleted. The configuration information of the virtual disk is, for example, parameters such as the name of the virtual disk, a driver, and a source path.

In this embodiment of the present application, the server may acquire the identifier of the network disk allocated to the virtual machine, and create a virtual disk with the identifier of the network disk for the virtual machine based on the network disk, so that the virtual machine can access the virtual disk by using the server . After the virtual machine starts the operating system based on the virtual disk, the server may instruct the virtual machine to log in to the storage service of the network disk. Further, after the virtual machine logs in to the storage service of the network disk, by identifying that the identifier of the network disk is consistent with the identifier of the virtual disk accessed before, it can be determined that the storage access path accessing the same storage space can be the virtual disk. The access path can also be the access path of the network disk, and then the access path of the virtual disk can be used as the primary path, and the access path of the network disk can be used as the backup path. Then, the server can log out of the storage service of the network disk in order to cut off the access path of the virtual disk. After the virtual machine detects that the server has logged out of the storage service of the network disk, the access path of the network disk can be used as the main path, and the virtual machine can be implemented later. The computer directly accesses the network disk.

Based on the above method, only a small amount of server resources can be occupied to access the virtual disk during the startup phase of the virtual machine. After the virtual machine is started, the virtual machine can directly log in to the storage service of the network disk, and then the access path of the virtual disk and the access path of the network disk can be changed. The path forms the primary and secondary paths, and after the server logs out of the storage service of the network disk, the virtual machine cannot use the server to access the virtual disk normally. The path as the main path can directly access the network disk without occupying server resources. Moreover, since the startup process of the virtual machine is a virtual disk accessed by a server, compared with the process of directly accessing the network disk based on a specific network storage protocol in the prior art, this solution is no longer limited to several specific network protocols. , the application range is wider and the scalability is better.

In order to better illustrate the configuration process of the present application, a specific implementation scenario is listed below to describe in detail the storage access method for the above-mentioned virtual machine of the present application.

In this implementation scenario, the interaction process between the server and the virtual machine can be abstracted into the interaction between two logical units, the host processing module and the client proxy processing module. Among them, the host processing module, running on the server, can realize the functions of the server logging in or out of the network disk storage service, creating a virtual disk for the virtual machine, and unloading the virtual disk; the client agent processing module, running on the virtual machine, It can detect the startup of virtual machines, the storage services of virtual machines logging in or out of network disks, and the starting of multi-pathing services. The host processing module and the client proxy processing module can interact through a specific serial port, such as a virtio serial port.

The following is the interaction between the host processing module and the client proxy processing module:

(1) The process in which the host processing module logs in to the storage service of the network disk and adds a virtual disk to the virtual machine.

Step 1: The host processing module receives the configuration parameters of the network disk allocated to the virtual machine.

The configuration parameters include the name of the virtual machine "vmA", the name of the network disk "iqn.abcd.1234:lun1", and the IP address of the network disk "192.168.1.1".

Step 2: The host processing module uses the initiaor tool and the name and IP address of the network disk to log in to the storage service of the network disk.

Specifically, the host processing module can use the initiator tool to input the name and IP address of the network disk, and then input the "login" command to log in to the storage service of the network disk. After logging in to the storage service of the network disk, it can be identified. The wwid of the network disk is "1234".

Step 3: The host processing module calls libvirt to add a virtual disk to the virtual machine.

Specifically, the driver of the virtual disk is, for example, virtio, the type of the virtual disk is a block device, and the source path of the virtual disk is "/dev/disk/by-path/ip-192.168.1.1:iqn.abcd.1234:lun1". In addition, the host processing module can also generate a wwid of "virtio-7890" for the virtual disk through a quick emulator (qemu) module.

Wherein, the above libvirt is an open-source application programming interface (Application Programming Interface, API) used for managing the virtualization platform. The specific usage can be found in the prior art, which will not be described here.

Step 4: The host processing module issues the qemu module to modify the wwid of the virtual disk.

Specifically, according to the source path of the disk "/dev/disk/by-path/ip-192.168.1.1:iqn.abcd.1234:lun1", you can search for the wwid of the virtual disk on the server that matches the source path. The wwid of the incoming virtual disk was changed from "virtio-7890" to "1234".

(2) The process of starting the multipath service after the virtual machine starts and logs in to the storage service of the network disk.

In step 5, the client agent processing module monitors the startup of the virtual machine.

Step 6: After the virtual machine starts the operating system based on the virtual disk, the client agent processing module sends a notification message indicating that the virtual machine has been started to the server.

Step 7: After receiving the notification message indicating that the virtual machine has been started, the host processing module searches for the name and IP address of the network disk according to the virtual machine, and then notifies the virtual machine of the name and IP address of the found network disk.

The name of the network disk is "iqn.abcd.1234:lun1", and the IP address is "192.168.1.1".

Step 8: The client agent processing module uses the initiaor tool and the name and IP address of the network disk to log in to the storage service of the network disk.

Specifically, the client agent module can use the initiator tool to input the name and IP address of the network disk, and then input the "login" command, so as to log in to the storage service of the network disk. After the network disk is successfully connected, the wwid of the network disk can be identified as "1234".

In step 9, the client agent processing module may deliver multipath configuration parameters to the GuestOS module in the virtual machine.

The GuestOS module can be understood as an operating system module running on the virtual machine. The multi-path configuration parameters delivered by the client agent processing module to the GuestOS module may include configuration parameters that allow the local disk to configure multi-path, and configuration parameters that the failure policy is highly available. Since the wwid of the network disk and the virtual disk is the same, the virtual machine can use the access path of the virtual disk and the access path of the network disk.

In step 10, the client agent processing module starts the multipath service.

After the multi-pathing service is enabled, since the wwid of the network disk and the virtual disk are the same, the virtual machine can use the access path of the virtual disk and the access path of the network disk, and the access path used by the virtual machine when starting the operating system is the virtual disk. Therefore, the virtual machine can use the access path of the virtual disk as the primary path and the access path of the network disk as the secondary path.

(3) The process that the host processing module unloads and deletes the network disk.

Step 11: The client agent processing module sends an unloading instruction for unloading the virtual disk to the host processing module.

Step 12: After the host processing module receives the uninstallation instruction, it searches the configuration parameters of the network disk corresponding to the virtual machine, and uses the initiaor tool and the name and IP address of the network disk to log out of the storage service of the network disk.

Specifically, the host processing module can use the initiator tool to input the name and IP address of the network disk, and then input the "logout (logout)" command to implement the storage service of logging out of the network disk.

In step 13, the client agent processing module takes the access path of the network disk as the main path.

Among them, since the server has logged out of the storage service of the network disk, the virtual machine can no longer rely on the server to access the virtual disk. Therefore, after the virtual machine recognizes that the access path of the virtual disk is faulty, the virtual machine can perform the master-standby switching process, and the network disk access path as the primary path.

Step 14: The host processing module calls libvirt to delete the configuration information of the virtual disk.

The configuration information includes, for example, the name of the virtual disk, and the source path and driver of the virtual disk.

In the embodiment of the present application, in the process of realizing the virtual machine directly accesses the network disk, the virtual disk is only accessed with the help of the server during the stage when the virtual machine starts the operating system, and after the virtual machine starts the operating system, the virtual machine can use the initiator tool, network disk The IP address and name of the virtual machine directly log in to the storage service of the network disk. It can be seen that the above-mentioned virtual machine logs in to the storage service of the network disk after the virtual machine has successfully started the operating system. In the method of logging in to the storage service of the network disk through the SAN network, the embodiment of the present application may not rely on the BIOS technical specifications of the virtual machine. After the operating system of the virtual machine is started, the initiaor tool can be used to log in to the storage service of the network disk. It can have good expansibility, and can not only be applied to the current non-volatile memory host controller interface specification (Non-Volatile Memory express over Fabrics, NVMeoF) protocol, but also can be applied to the network storage protocol that may appear in the future.

In addition, in order to enable the virtual machine to directly access the network disk, after logging in to the storage service of the network disk, the virtual machine can also start the multi-path service to use the access path of the virtual disk as the primary path and the access path of the network disk as the backup path. Then instruct the server to unmount the virtual disk, so as to cut off the path for accessing the virtual disk in the multi-path service, so that the access path of the network disk is switched to the main path, and subsequent virtual machines can directly access the network disk.

Based on the same application concept, the embodiment of the present application also provides a storage access device for a virtual machine corresponding to the storage access method for the virtual machine. The storage access method is similar, so the implementation of the device can refer to the implementation of the method, and the repeated places will not be repeated.

Referring to FIG. 3 , which is a schematic structural diagram of a storage access device for a virtual machine provided by an embodiment of the present application, the device 30 includes: an acquisition module 31 , a creation module 32 , an instruction module 33 , and an uninstallation module 34 ; wherein,

an obtaining module 31, configured to log in to the storage service of the network disk allocated for the virtual machine and obtain the identifier of the network disk;

A creation module 32, configured to create a virtual disk with the identifier of the network disk for the virtual machine based on the network disk;

The instructing module 33 is configured to instruct the virtual machine to log in to the storage service of the network disk after it is determined that the virtual machine starts the operating system based on the virtual disk; wherein, the virtual machine logs in to the storage service of the network disk The storage access path after the service includes the access path of the network disk and the access path of the virtual disk, the access path of the virtual disk is the primary path, and the access path of the network disk is the backup path;

The uninstallation module 34 is configured to log out of the storage service of the network disk, so that the virtual machine switches the access path of the network disk to the main path.

In a possible design, when the obtaining module 31 logs in to the storage service of the network disk allocated for the virtual machine and obtains the identifier of the network disk, it is specifically used to:

Obtain the Internet Protocol IP address of the network disk and the name of the network disk, and log in to the storage service of the network disk based on the IP address and the name.

In a possible design, when the creation module 32 creates a virtual disk with the identifier of the network disk for the virtual machine based on the network disk, it is specifically used for:

creating the virtual disk with a temporary identifier in the network disk;

Modify the temporary identifier of the virtual disk to the identifier of the network disk.

In a possible design, when the unloading module 34 logs out of the storage service of the network disk, it is specifically used to:

After receiving the uninstall instruction sent by the virtual machine to instruct to uninstall the network disk, log out of the storage service of the network disk.

In a possible design, after logging out of the storage service of the network disk, the unloading module 34 is further configured to:

Delete the configuration information of the virtual disk.

For the description of the processing flow of each module in the apparatus 30 and the interaction flow between the modules, reference may be made to the relevant description of the server in the foregoing method embodiment, which will not be described in detail here.

Based on the same application concept, the present application also provides another storage access device for a virtual machine. Referring to FIG. 4 , the device 40 includes: a startup module 41, a connection module 42, a determination module 43, and a switch module 44; wherein ,

The startup module 41 is configured to start the operating system of the virtual machine based on the virtual disk; wherein, the virtual disk is created by the host for the virtual machine based on the network disk, and the network disk is the same as the virtual disk. Identifiers are consistent;

a connection module 42, configured to log in to the storage service of the network disk under the instruction of the server;

A determination module 43, configured to determine, based on the identifier shared by the network disk and the virtual disk, that the storage access path of the virtual machine includes an access path of the network disk and an access path of the virtual disk; wherein , the access path of the virtual disk is the primary path, and the access path of the network disk is the backup path;

The switching module 44 is configured to switch the access path of the network disk to the main path after detecting that the server logs out of the storage service of the network disk.

In a possible design, the determining module 43 determines, based on the identifier shared by the network disk and the virtual disk, that the storage access path of the virtual machine includes the access path of the network disk and the When specifying the access path of the virtual disk, it is specifically used for:

When it is recognized that the network disk and the virtual disk share the identifier, by starting the multi-path service, the access path of the virtual disk is determined as the primary path, and the access path of the network disk is determined as the backup path .

For the description of the processing flow of each module in the apparatus 40 and the interaction flow between the modules, reference may be made to the relevant description of the virtual machine in the above method embodiment, which will not be described in detail here.

Based on the same application concept, an embodiment of the present application also provides a schematic structural diagram of an electronic device. The electronic device 50 includes a processor 51, a memory 52, and a bus 53. The memory 52 stores execution instructions. When the device 50 During operation, the processor 51 communicates with the memory 52 through the bus 53, and the processor 51 executes the execution instructions stored in the memory 52, so that the device 50 executes the implementation of the methods involved in the foregoing method embodiments. The steps of the storage access method of the virtual machine.

In a possible implementation manner, the storage access method of the virtual machine executed by the processor 51 is as follows:

Log in to the storage service of the network disk allocated for the virtual machine and obtain the identifier of the network disk;

creating a virtual disk for the virtual machine with an identifier of the network disk based on the network disk;

After determining that the virtual machine starts the operating system based on the virtual disk, instruct the virtual machine to log in to the storage service of the network disk; wherein, the storage access path after the virtual machine logs in to the storage service of the network disk Including the access path of the network disk and the access path of the virtual disk, the access path of the virtual disk is the primary path, and the access path of the network disk is the backup path;

Log out of the storage service of the network disk, so that the virtual machine switches the access path of the network disk to the main path.

In another possible implementation manner, the storage access method of the virtual machine executed by the processor 51 is as follows:

Start the operating system of the virtual machine based on the virtual disk; wherein, the virtual disk is created by the host for the virtual machine based on a network disk, and the identifier of the network disk and the virtual disk are consistent;

Log in to the storage service of the network disk under the instruction of the server;

Based on the identifier shared by the network disk and the virtual disk, it is determined that the storage access path of the virtual machine includes an access path of the network disk and an access path of the virtual disk; The access path is the primary path, and the access path of the network disk is the backup path;

After detecting that the server logs out of the storage service of the network disk, the access path of the network disk is switched to the main path.

For the specific processing flow involved in the processor 51, reference may be made to the relevant descriptions in the foregoing method embodiments, which will not be described herein again.

The above-mentioned storage access method and device for a virtual machine provided by the present application can only occupy a small amount of server resources to access the virtual disk during the startup phase of the virtual machine. After the virtual machine is started, the virtual machine can directly log in to the storage service of the network disk, and further The access path of the virtual disk and the access path of the network disk form the primary and backup paths, and after the server logs out of the storage service of the network disk, the virtual machine cannot use the server to access the virtual disk normally, and the virtual machine recognizes the access path of the virtual disk. After a fault occurs, the access path of the network disk can be used as the main path, so as to achieve the purpose of directly accessing the network disk without occupying server resources. Moreover, since the way that the virtual machine logs into the storage service of the network disk is performed after the virtual machine successfully starts the operating system, compared with the prior art based on a specific network storage protocol in the process of starting the operating system of the virtual machine through the SAN network. In the process of logging in to the storage service of the network disk, this solution does not depend on the technical specifications of the operating system of the virtual machine, nor is it limited by several specific network protocols, and has a wide range of applications and good scalability.

In addition, an embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and the computer program is executed by a processor when the storage access of the virtual machine described in the foregoing method embodiments is executed. steps of the method.

The computer program product of the storage access method for a virtual machine provided by the embodiments of the present application includes a computer-readable storage medium storing program codes, and the instructions included in the program codes can be used to execute the virtual machine described in the foregoing method embodiments. For the steps of the storage access method, reference may be made to the foregoing method embodiments, which will not be repeated here.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific working process of the system and device described above, reference may be made to the corresponding process in the foregoing method embodiments, which will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. The apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-executable non-volatile computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution, and the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes.

The above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the technical scope disclosed in the present application can easily think of changes or replacements, which should be covered within the scope of the present application. within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (14)

1. A storage access method for a virtual machine, applied in a server, wherein a virtual machine is created in the server, characterized in that, comprising: The server logs in the storage service of the network disk allocated for the virtual machine and obtains the identifier of the network disk; The server creates a virtual disk with the identifier of the network disk for the virtual machine based on the network disk; After determining that the virtual machine starts the operating system based on the virtual disk, the server instructs the virtual machine to log in to the storage service of the network disk; wherein, the storage access after the virtual machine logs in to the storage service of the network disk The path includes the access path of the network disk and the access path of the virtual disk, the access path of the virtual disk is the primary path, and the access path of the network disk is the backup path; The server logs out the storage service of the network disk, so that the virtual machine switches the access path of the network disk to the main path. 2. The method according to claim 1, wherein the logging in to the storage service of the network disk allocated for the virtual machine comprises: Obtain the Internet Protocol IP address of the network disk and the name of the network disk, and log in to the storage service of the network disk based on the IP address and the name. 3. The method of claim 1, wherein the creating a virtual disk with an identifier of the network disk for the virtual machine based on the network disk comprises: creating the virtual disk with a temporary identifier in the network disk; Modify the temporary identifier of the virtual disk to the identifier of the network disk. 4. The method of claim 1, wherein the logging out of the storage service of the network disk comprises: After receiving the uninstall instruction sent by the virtual machine for instructing to uninstall the network disk, log out the storage service of the network disk based on the IP address of the network disk and the name of the network disk. 5. The method according to claim 1 or 4, wherein after logging out of the storage service of the network disk, the method further comprises: Delete the configuration information of the virtual disk. 6. A storage access method for a virtual machine, applied in the virtual machine created on the server, characterized in that, comprising: Start the operating system of the virtual machine based on the virtual disk; wherein, the virtual disk is created by the server for the virtual machine based on a network disk, and the identifier of the network disk is consistent with the identifier of the virtual disk; Log in to the storage service of the network disk under the instruction of the server; Based on the identifier shared by the network disk and the virtual disk, it is determined that the storage access path of the virtual machine includes the access path of the network disk and the access path of the virtual disk, wherein the storage access path of the virtual disk is The access path is the primary path, and the access path of the network disk is the backup path; After detecting that the server logs out of the storage service of the network disk, the access path of the network disk is switched to the main path. 7 . The method of claim 6 , wherein determining the storage access path of the virtual machine based on the identifier shared by the network disk and the virtual disk includes accessing the network disk. 8 . path and the access path of the virtual disk, including: When it is recognized that the network disk and the virtual disk share the identifier, by starting the multi-path service, the access path of the virtual disk is determined as the primary path, and the access path of the network disk is determined as the backup path . 8. A storage access device for a virtual machine, characterized in that it is applied to a server in which a virtual machine is created, the device comprising: an obtaining module, configured to log in to the storage service of the network disk allocated for the virtual machine and obtain the identifier of the network disk; A creation module, configured to create a virtual disk with the identifier of the network disk for the virtual machine based on the network disk; an instructing module, configured to instruct the virtual machine to log in to the storage service of the network disk after determining that the virtual machine starts the operating system based on the virtual disk; wherein the virtual machine logs in to the storage service of the network disk The latter storage access path includes the access path of the network disk and the access path of the virtual disk, the access path of the virtual disk is the primary path, and the access path of the network disk is the backup path; The uninstallation module is configured to log out of the storage service of the network disk, so that the virtual machine switches the access path of the network disk to the main path. 9. The apparatus according to claim 8, wherein, when logging in the storage service of the network disk allocated for the virtual machine, the obtaining module is specifically used for: Obtain the Internet Protocol IP address of the network disk and the name of the network disk, and log in to the storage service of the network disk based on the IP address and the name. 10. The apparatus according to claim 8, wherein, when the creation module creates a virtual disk with an identifier of the network disk for the virtual machine based on the network disk, the creating module is specifically used for: creating the virtual disk with a temporary identifier in the network disk; Modify the temporary identifier of the virtual disk to the identifier of the network disk. 11. The apparatus according to claim 8, wherein when logging out of the storage service of the network disk, the uninstallation module is specifically configured to: After receiving the uninstall instruction sent by the virtual machine for instructing to uninstall the network disk, log out the storage service of the network disk based on the IP address of the network disk and the name of the network disk. 12. The apparatus according to claim 8 or 11, wherein after logging out of the storage service of the network disk, the uninstallation module is further configured to: Delete the configuration information of the virtual disk. 13. A storage access device for a virtual machine, wherein the device comprises: a startup module, configured to start the operating system of the virtual machine based on a virtual disk; wherein, the virtual disk is created by the server for the device based on a network disk, and the identifier of the network disk is consistent with the identifier of the virtual disk; a connection module, used for logging in the storage service of the network disk under the instruction of the server; a determining module, configured to determine, based on the identifier shared by the network disk and the virtual disk, that the storage access path of the virtual machine includes the access path of the network disk and the access path of the virtual disk; wherein, The access path of the virtual disk is the primary path, and the access path of the network disk is the backup path; The switching module is configured to switch the access path of the network disk to the main path after detecting that the server logs out of the storage service of the network disk. 14 . The apparatus of claim 13 , wherein the determining module determines, based on the identifier shared by the network disk and the virtual disk, that the storage access path of the virtual machine includes the network disk. 15 . The access path of the disk and the access path of the virtual disk are specifically used for: When it is recognized that the network disk and the virtual disk share the identifier, by starting the multi-path service, the access path of the virtual disk is determined as the primary path, and the access path of the network disk is determined as the backup path .

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