CN102118458A - Method and system for live migration of virtual machine - Google Patents

Abstract

The invention discloses a method and system for live migration of a virtual machine. The method comprises the following steps of: when judging that the virtual machine is lively migrated from a source physical machine to a destination physical machine, creating a virtual network device required by the virtual machine on the destination physical machine; and lively migrating the virtual machine from the source physical machine to the destination physical machine after creation is completed. By using the method and the system provided by the invention, when the virtual machine requires migrating from one physical machine to another physical machine, the live migration of the virtual machine can be realized successfully without influencing internetworking.

Description

Method and system for virtual machine live migration

technical field

The invention relates to the field of cloud computing, in particular to a method and system for live migration of a virtual machine.

Background technique

Currently, cloud computing has become one of the hottest technologies in the IT field. In the process of realizing cloud computing, physical machine virtualization is the key to realize cloud computing. Manufacturers such as IBM, Xen/Critix and Microsoft all have virtualization products, among which Xen is open source. All of these products can realize hot migration of virtual machines, that is, transfer virtual machines from one physical machine to another when the virtual machine is turned off.

The conditions for implementing virtual machine live migration are relatively harsh, requiring the destination host and the source host to have the same physical environment and software environment, such as the same type of CPU, and the virtual interface through which the virtual machine connects to the virtual machine network. There are three main ways for virtual machines to connect to the network: one is to share a physical network card, the other is to build a NAT (Network Address Translation) network, and the third is to build an isolated virtual network.

Contents of the invention

The technical problem to be solved by the present invention is how to ensure that the virtual machine can successfully realize hot migration without affecting network interconnection when the virtual machine needs to be migrated from one physical machine to another physical machine.

In order to solve the above problems, the present invention provides a method for virtual machine live migration, which is applicable to the situation where the virtual machine is connected to the network in NAT mode, including:

When it is determined that the virtual machine is to be hot-migrated from the source physical machine to the target physical machine, creating a virtual network device required by the virtual machine on the target physical machine;

After the creation is completed, the virtual machine is hot-migrated from the source physical machine to the target physical machine.

Further, before the step of creating the virtual network device required by the virtual machine on the target physical machine, it also includes:

Detect whether there is a virtual network device required by the virtual machine on the target physical machine, if not, perform the step of creating the virtual network device required by the virtual machine on the target physical machine; The step of hot migrating the virtual machine from the source physical machine to the target physical machine.

Further, after the step of hot migrating the virtual machine from the source physical machine to the target physical machine, it also includes:

Deleting the virtual network device used by the virtual machine on the source physical machine.

Further, the step of creating the virtual network device required by the virtual machine on the target physical machine includes:

Obtain the configuration information of the virtual network device currently used by the virtual machine from the source physical machine; the configuration information includes one or more of the following items: model, connection parameters, transmission parameters, allocated IP address range, and The connection method of the physical machine;

Create the same virtual network device on the target physical machine as that on the source physical machine according to the configuration information.

The present invention also provides a virtual machine live migration system, which is applicable to the situation where the virtual machine is connected to the network in NAT mode, including:

thermal migration module;

A creating module, configured to create a virtual network device required by the virtual machine on the target physical machine when the hot migration module determines that the virtual machine is to be hot-migrated from the source physical machine to the target physical machine;

The hot migration module is configured to hot migrate the virtual machine from the source physical machine to the destination physical machine after the creation module is created.

Further, the creation module is also used to detect whether there is a virtual network device required by the virtual machine on the target physical machine before creating the virtual network device required by the virtual machine, and if not, create the virtual network device. If there is a virtual network device required by the computer, the hot migration module is notified that the creation is completed.

Further, the hot migration module is further configured to delete the virtual network device used by the virtual machine on the source physical machine after the virtual machine is hot-migrated from the source physical machine to the destination physical machine.

Further, the creation module includes:

The obtaining unit is configured to obtain configuration information of the virtual network device currently used by the virtual machine from the source physical machine; the configuration information includes one or more of the following items: model, connection parameters, transmission parameters, assigned IP address range, connection method with physical machine;

The creating unit is used to create, on the target physical machine, the same virtual network device as that on the source physical machine according to the configuration information.

The technical solution of the present invention dynamically builds a virtual network device for connecting the virtual machine to the network on the target machine before the virtual machine is hot-migrated, so as to ensure that the virtual machine is connected to the network in NAT mode, and the network interconnection after the virtual machine is hot-migrated is not Affected.

Description of drawings

FIG. 1 is a schematic diagram of a specific implementation process of virtual machine live migration in Embodiment 1.

Detailed ways

The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

It should be noted that, if there is no conflict, the embodiments of the present invention and various features in the embodiments can be combined with each other, and all are within the protection scope of the present invention. In addition, the steps shown in the flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although a logical order is shown in the flow diagrams, in some cases, the sequence may be different. The steps shown or described are performed in the order herein.

Embodiment 1, a method for live migration of a virtual machine is applicable to the situation where the virtual machine is connected to the network in NAT mode, including:

When it is determined that the virtual machine is to be hot-migrated from the source physical machine to the target physical machine, creating a virtual network device required by the virtual machine on the target physical machine;

After the creation is completed, the virtual machine is hot-migrated from the source physical machine to the target physical machine.

In this embodiment, before the step of creating the virtual network device required by the virtual machine on the destination physical machine, it may further include:

Detect whether there is a virtual network device required by the virtual machine on the target physical machine, if not, perform the step of creating the virtual network device required by the virtual machine on the target physical machine; The step of hot migrating the virtual machine from the source physical machine to the target physical machine.

In this embodiment, the step of hot migrating the virtual machine from the source physical machine to the target physical machine may further include:

Deleting the virtual network device used by the virtual machine on the source physical machine.

A specific migration process of this embodiment is shown in Figure 1. First, detect the virtual network device on the destination physical machine B, and create it if it does not exist; perform migration after completion, and migrate the virtual machine on the source physical machine A to the destination After the physical machine B is installed, delete the virtual network device used by the virtual machine on the source physical machine A; after the migration is complete, there is no virtual machine on the source physical machine A, but there is one on the target physical machine B.

In this embodiment, the step of creating the virtual network device required by the virtual machine on the target physical machine may specifically include:

Obtain the configuration information of the virtual network device currently used by the virtual machine from the source physical machine; the configuration information includes one or more of the following items: model, connection parameters, transmission parameters, allocated IP address range, and The connection method of the physical machine, etc.;

Create the same virtual network device on the target physical machine as that on the source physical machine according to the configuration information.

This embodiment can automatically create the required virtual network device on the target physical machine according to the way the virtual machine is connected to the network; in actual application, the virtual machine monitor can provide an interface for creating a virtual network device, and the system can call the relevant interface to create Virtual network device.

Embodiment 2, a virtual machine hot migration system is applicable to the situation where the virtual machine is connected to the network in NAT mode, including:

thermal migration module;

A creating module, configured to create a virtual network device required by the virtual machine on the target physical machine when the hot migration module determines that the virtual machine is to be hot-migrated from the source physical machine to the target physical machine;

The hot migration module is configured to hot migrate the virtual machine from the source physical machine to the destination physical machine after the creation module is created.

In this embodiment, the creation module can also be used to detect whether there is a virtual network device required by the virtual machine on the target physical machine before creating the virtual network device required by the virtual machine, and if not, create If there is a virtual network device required by the virtual machine, notify the hot migration module that the creation is completed.

In this embodiment, the hot migration module can also be used to delete the virtual network device used by the virtual machine on the source physical machine after the virtual machine is hot-migrated from the source physical machine to the destination physical machine .

In this embodiment, the creation module may specifically include:

The obtaining unit is configured to obtain configuration information of the virtual network device currently used by the virtual machine from the source physical machine; the configuration information includes one or more of the following items: model, connection parameters, transmission parameters, assigned IP address range, connection method with the physical machine, etc.;

The creating unit is used to create, on the target physical machine, the same virtual network device as that on the source physical machine according to the configuration information.

Other implementation details may be the same as those in Embodiment 1.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules. The present invention is not limited to any specific combination of hardware and software.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should all belong to the protection scope of the claims of the present invention.

Claims (8)

1. A method for live migration of a virtual machine, applicable to the situation where the virtual machine is connected to the network in a NAT mode, including: When it is determined that the virtual machine is to be hot-migrated from the source physical machine to the target physical machine, creating a virtual network device required by the virtual machine on the target physical machine; After the creation is completed, the virtual machine is hot-migrated from the source physical machine to the target physical machine. 2. The method according to claim 1, further comprising: Detect whether there is a virtual network device required by the virtual machine on the target physical machine, if not, perform the step of creating the virtual network device required by the virtual machine on the target physical machine; The step of hot migrating the virtual machine from the source physical machine to the target physical machine. 3. The method according to claim 1, further comprising: after the step of hot migrating the virtual machine from the source physical machine to the destination physical machine: Deleting the virtual network device used by the virtual machine on the source physical machine. 4. The method according to any one of claims 1 to 3, wherein the step of creating the virtual network device required by the virtual machine on the destination physical machine comprises: Obtain the configuration information of the virtual network device currently used by the virtual machine from the source physical machine; the configuration information includes one or more of the following items: model, connection parameters, transmission parameters, allocated IP address range, and The connection method of the physical machine; Create the same virtual network device on the target physical machine as that on the source physical machine according to the configuration information. 5. A system for live migration of a virtual machine, applicable to the situation where the virtual machine is connected to the network in a NAT mode, characterized in that it comprises: thermal migration module; A creating module, configured to create a virtual network device required by the virtual machine on the target physical machine when the hot migration module determines that the virtual machine is to be hot-migrated from the source physical machine to the target physical machine; The hot migration module is configured to hot migrate the virtual machine from the source physical machine to the destination physical machine after the creation module is created. 6. The system of claim 5, wherein: The creation module is also used to detect whether there is a virtual network device required by the virtual machine on the target physical machine before creating the virtual network device required by the virtual machine, and if not, create the required virtual network device for the virtual machine. If there is a virtual network device, the hot migration module is notified that the creation is completed. 7. The system of claim 5, wherein: The hot migration module is further configured to delete the virtual network device used by the virtual machine on the source physical machine after the virtual machine is hot-migrated from the source physical machine to the target physical machine. 8. The system according to any one of claims 5 to 7, wherein the creation module comprises: The obtaining unit is configured to obtain configuration information of the virtual network device currently used by the virtual machine from the source physical machine; the configuration information includes one or more of the following items: model, connection parameters, transmission parameters, assigned IP address range, connection method with physical machine; The creating unit is used to create, on the target physical machine, the same virtual network device as that on the source physical machine according to the configuration information.

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