WO2012152153A1 - Method, monitor and system for seamless migration of virtual machine - Google Patents

Abstract

The present invention relates to a method, a monitor and a system for the seamless migration of a virtual machine. The method comprises that: acquiring the related migration information of an active virtual machine in a source server; during the suspension of the active virtual machine, receiving and caching a data message from a related network element; when the active virtual machine is migrated to a destination server from the source server, and is reactivated, forwarding the data message to the active virtual machine according to the related migration information. In the present invention, the concentrative virtual machine seamless migration monitor is deployed in a network, receives and caches the related data message during the suspension of the active virtual machine, and forwards the data message to the active virtual machine after the active virtual machine is reactivated. Therefore, service running continuity in a virtual machine migration process is ensured, the problem of service data message loss caused by the virtual machine migration is solved, and network performance is improved.

Description

 Method, manager and system for seamless migration of virtual machines

 The present invention relates to the field of cloud computing virtualization, and in particular, to a method, a manager and a system for seamless migration of virtual machines. Background technique

 Cloud Computing is an emerging shared infrastructure computing method that connects huge pools of system resources to provide information (IT) services. Cloud computing is a product of the convergence of traditional computer technologies and network technologies such as grid computing, distributed computing, parallel computing, utility computing, network storage, virtualization, and load balancing. It aims to integrate multiple relatively low-cost computing entities into a powerful system through the network, and with software-as-a-service (SaaS, Platform as a Service) (PaaS, Platform as a Service) Business models such as IaaS (Isolated Infrastructure as a Service) distribute various capabilities and services to end users. For example, a cloud computing data center based on virtual cluster technology is an existing business model. It leases virtual machines and networks of large cloud computing data centers to deploy various business networks, which can achieve rapid deployment and reduce operating costs.

In the business model of the cloud computing data center described above, dynamic online migration of virtual machines is critical to the realization of high availability, rapid Elasticity, and Economization of cloud computing data centers. For example, when a physical server needs to be maintained, you can migrate the virtual machine to another physical server to ensure that the physical server does not affect the service during the maintenance process. For example, when the virtual machine load is light, multiple physical servers can be used. The virtual machine on the migration migrates to a few physical servers, shutting down the power of other physical servers, and saving energy without affecting the service. In the prior art, a typical network architecture of a cloud computing data center is shown in FIG. 1 . The cloud computing data center is composed of a virtual cluster management server (DCMP, Data Center Management Platform) 10, a network storage device (NAS), and a plurality of physical servers 3 supporting virtualization technologies. The virtual cluster management server 10 is responsible for unified scheduling, allocation, and management of virtual machine resources in the cloud computing data center; the network storage device 20 provides high-speed reading and writing of virtual disk external virtual disk files through the Fibre Channel. The physical server of the cloud computing data center virtualizes local physical resources through a virtual machine manager (VMM) 40, and supports running multiple virtual machines (VMs) on the same set of physical resources.

 In the network environment of the cloud computing data center, the virtual disk file required for the virtual machine 50 to run is stored on the NAS 20. When the virtual machine 50 starts, the virtual disk file content is read from the NAS 20 to the memory, and the virtual disk is read. The file is read and written to the external NAS 20. Online migration of virtual machine 50 is accomplished by copying memory between the source and destination servers. The specific steps for online migration of existing virtual machines include:

 Step S1: Migration preparation. Plan to migrate the active virtual machine VM1 on the source server to the destination server;

 Step S2: The destination server resource is reserved. Reserve the resources required for VM1 running on the destination server, including memory, CPU, network, etc. If the resource reservation fails, stop the VM migration and feed back the result.

 Step S3: Memory cycle pre-copy. First, copy the memory page of the virtual machine VM1 running on the source server to the destination server, and then copy the modified memory page (dirty page) during the previous round of memory copy each time;

Step S4: Stop copying. When the number of memory pages to be copied or the dirty page rate of memory (the number of pages of dirty memory during each cycle divided by the number of pages of the required copy) meets the predetermined threshold, the circular copy is stopped, the source virtual machine is suspended, and the remaining The memory page and the virtual machine's status data (CPU status and non-contiguous memory pages) are synchronized to the destination server at one time; and the active ARP is sent to the network. Request to update the network location to the destination server;

 Step S5: Confirm. After receiving all the memory pages and the virtual machine state data, the destination server notifies the source server to complete the virtual machine migration, and the source server confirms and releases the resources occupied by the virtual machine VM1;

 Step S6: Activate. The destination server activates the migrated VM VM1 and connects to the local device, such as the I/O port, to resume normal operation.

 In the above process, when performing step S4 to step S5, the virtual machine VM1 is in a suspended state on both the source server and the destination server, and the virtual machine VM1 is suspended according to the amount of data to be copied and the transmission bandwidth in step S4. The length of time varies, resulting in a small amount of packet loss during this time. Moreover, the source address server sends an Active Address Resolution Protocol (ARP) request, and some network devices may refuse to respond to this. Therefore, the network device can completely perceive the change of the location of the virtual machine VM1 until the virtual machine VM1 on the destination server initiates the first data packet to the network. Therefore, the existing virtual machine migration technology has a disruption between the virtual machine and the network connection, thereby affecting the continuity of the virtual machine running service. Summary of the invention

 The main purpose of the present invention is to provide a method, a manager, and a system for seamlessly migrating virtual machines to solve the problem of loss of service packets caused by virtual machine suspension during virtual machine online migration.

 In order to achieve the above object, the present invention provides a method for seamless migration of a virtual machine, the method comprising:

 Obtain related migration information of the active virtual machine located on the source server;

 Receiving, during the suspension of the active virtual machine, a data packet sent by the relevant network element, and caching; when the active virtual machine is migrated from the source server to the destination server and is reactivated, according to the related migration information. Forwarding the data message to the active virtual machine.

Preferably, the related migration information of the active virtual machine includes: before the active virtual machine is migrated And/or migrated Internet Protocol (IP, Internet Protocol) addresses, Media Access Control (MAC, Medium/Media Access Control) addresses, and/or migrations.

 Preferably, the acquiring, by the virtual cluster management server, the source server, the virtual machine manager, or the destination server, the related migration information of the active virtual machine that needs to be migrated, where the related migration information of the active virtual machine located on the source server is obtained. .

 Preferably, the related network element includes: a service function module, a router, a switch, a related gateway device, and/or a source server virtual machine manager.

 Preferably, before the receiving the data packet sent by the relevant network element, the method further includes: obtaining, by the related network element, the virtual machine by using a pre-configuration manner or a domain name resolution service (DNS) mechanism The address information of the migrated manager sends the data packet according to the address information.

 Preferably, before the forwarding the data packet to the active virtual machine, the method further includes: receiving an active virtual machine activation notification sent by the destination server.

 Preferably, the data packet sent by the related network element includes: the data packet sent by using a source routing manner or an IP tunneling manner.

 The present invention also provides a manager for seamless migration of a virtual machine, the manager comprising: an address obtaining block, a receiving buffer module, and a message forwarding module;

 An address obtaining module, configured to acquire an active migration information receiving cache module of the active virtual machine located on the source server, configured to receive a data packet sent by the related network element and cache the active virtual machine during the suspension;

 a message forwarding module, configured to: when the active virtual machine is migrated from the source server to the destination server and reactivated, according to the related migration information of the active virtual machine saved in the address obtaining module, the receiving cache module is cached The data message is forwarded to the active virtual machine.

Preferably, the message forwarding module is further configured to: when the active virtual machine is served from the source When the device migrates to the destination server and is reactivated, it receives an active virtual machine activation notification sent by the destination server.

 Preferably, the address obtaining module is specifically configured to save the pre-migration and/or post-migration IP address, MAC address, and/or migration status of the active virtual machine as related migration information of the active virtual machine.

 The invention also provides a system for seamless migration of a virtual machine, the system comprising: a source server, a destination server and a seamless migration manager of the virtual machine; wherein:

 The source server suspends the active virtual machine after the copying of the scheduled memory page of the active virtual machine to the destination server before the active virtual machine is migrated, and suspends the remaining unmigrated memory pages and activities The state data of the virtual machine is synchronized to the destination server;

 The virtual machine seamless migration manager is configured to acquire related migration information of the active virtual machine located on the source server; receive the data packet sent by the relevant network element and cache the active virtual machine during the suspension; When the active virtual machine is migrated from the source server to the destination server and is reactivated, forwarding the data packet to the active virtual machine in the destination server according to the related migration information;

 The destination server is configured to activate the active virtual machine when the active virtual machine completes the migration, and receive and save the data packet sent by the manager that the virtual machine seamlessly migrates.

 Preferably, the source server is further configured to copy a memory page run by the active virtual machine to the destination server, and subsequently copy the modified memory page during a previous round of memory copy each time; When the number of memory pages or memory dirty page rate meets a predetermined threshold, the circular copy is stopped.

 Preferably, the destination server is further configured to: when the active virtual machine is activated, send an active virtual machine activation notification to a manager that seamlessly migrates the source server and the virtual machine;

Correspondingly, the source server is further configured to release the resources occupied by the active virtual machine after receiving the active virtual machine activation notification; The manager for seamlessly migrating the virtual machine is specifically configured to: when receiving the active virtual machine activation notification sent by the destination server, forward the data packet to the active virtual in the destination server according to the related migration information. machine.

 The method, the manager and the system for seamlessly migrating a virtual machine according to the present invention, the related migration of the active virtual machine before the active virtual machine is suspended by deploying the centralized virtual machine seamless migration manager on the network The manager informs the virtual machine of the seamless migration of the virtual machine; the active virtual machine hangs on the manager that is sent to the virtual machine for seamless migration; the virtual machine seamless migration manager receives and caches the related data message, and is active in the virtual machine. After the device is reactivated, the data packet is forwarded to the active VM. This ensures the continuity of the running of the VM during the VM migration process. This solves the problem of loss of service data packets caused by VM migration and improves network performance. . DRAWINGS

 1 is a schematic diagram of a network architecture of an existing cloud computing data center;

 2 is a schematic diagram of a network architecture of a cloud computing data center in the present invention;

 3 is a schematic flow chart of an embodiment of a method for seamlessly migrating a virtual machine according to the present invention;

 4a is a flowchart of processing in an active virtual machine network migration in an embodiment of a method for seamlessly migrating a virtual machine according to the present invention;

 FIG. 4b is a flowchart of a process for moving an active virtual machine across network segments in an embodiment of a method for seamlessly migrating a virtual machine according to the present invention; FIG.

 5 is a schematic structural diagram of an embodiment of a seamless migration of a virtual machine according to the present invention; and FIG. 6 is a schematic structural diagram of an embodiment of a system for seamless migration of a virtual machine according to the present invention.

In order to make the technical solutions of the present invention clearer and clearer, the following will be further reviewed in conjunction with the accompanying drawings. detailed description

 The solution of the embodiment of the present invention is mainly: collecting, caching, and forwarding service data packets on the network during the suspension of the active virtual machine by deploying the centralized virtual machine seamless migration manager on the network, to solve the problem due to the active virtual machine The loss of service data packets caused by the migration.

 The network architecture of the cloud computing data center involved in the embodiment of the present invention is as shown in FIG. 2 . Cloud computing The data center mainly includes the following devices or network elements: virtual cluster management server, network storage device, physical server (including source server and destination server), virtual machine seamless migration manager, network connection device and other networks. among them:

 The virtual cluster management server is responsible for managing the management of all resources in the virtual cluster, including physical resources (including processors, memory, network interfaces, etc.), storage devices, network devices, and other physical resources, as well as virtual resources such as virtual machines and virtual networks. Provide external management and scheduling of virtual resources, such as virtual machine application, creation, update, deletion, and virtual network configuration.

 A network storage device that provides templates and image files required for virtual machine installation, storage of virtual disk files outside the virtual machine, and storage of data blocks. Generally, network storage devices are connected to the network through fiber optic equipment to provide high-speed, high-bandwidth external storage channels.

 The physical server, which supports the virtualized server device, can share the hardware resources of one physical server through the virtual machine manager (VMM) 304, and supports the running of multiple virtual machines. Generally, there are multiple physical servers in a cloud computing data center.

 The virtual machine seamless migration manager is responsible for receiving, caching, and forwarding data packets during the virtual machine hang caused by the virtual machine migration to ensure the continuity of the service running by the migrated virtual machine. In the present invention, the virtual machine seamless migration manager is deployed as a public network element, and can be exposed through a cloud computing data center configuration file, or can be queried by other means such as DNS.

In addition, large data centers may also need to divide networks across network segments and regions. The physical servers in one network segment form a group and connect devices and other networks through the network. Connected, the network connection device is generally a router or switch or other gateway device.

 As shown in FIG. 3, based on the foregoing network architecture, an embodiment of the present invention provides a method for seamlessly migrating a virtual machine, including:

 Step S101: The virtual machine seamless migration manager acquires related migration information of the active virtual machine located on the source server.

 Here, the related migration information of the active virtual machine is address information of the active virtual machine at the destination server, specifically:

 For the virtual machine migration in the network, that is, if the active virtual machine does not change the IP address and/or the MAC address before and after the migration, the related migration information of the active virtual machine is the address and status information of the active virtual machine, such as active virtual IP address, MAC address, migration status (suspended or reactivated);

 For the virtual machine migration across the network segment, that is, when the active virtual machine changes the IP address and/or the MAC address before and after the migration, the related migration information of the active virtual machine is the address and status information before and after the active virtual machine migration, such as an activity. IP address and MAC address before virtual machine migration, IP address and MAC address after migration of active virtual machine, migration status (suspended or reactivated).

 The obtaining may be: sending, by the virtual cluster management server, the virtual machine manager of the source server, or the virtual machine manager of the destination server, the related migration information of the active virtual machine to be migrated to the manager of the virtual machine seamless migration.

 After the foregoing step S101 is completed, the related migration information of the active virtual machine may be saved in a migration virtual machine information table, so as to perform data packet forwarding according to the related migration information in the migration virtual machine information table.

Before the step S101 is started, it is required to determine whether the active virtual machine is suspended, including: determining, by the source server, whether the active virtual machine is suspended, and notifying the virtual machine to migrate the manager, the destination server, and the related network by the source server. yuan. Before the active virtual machine is suspended, the resources required for the active virtual machine to run, including the memory and the central processing unit, need to be reserved on the destination server. (CPU, Computer Process Unit), network, etc. If the resource reservation fails, the virtual machine migration is stopped and the result is fed back;

 Before the active virtual machine is suspended, the memory loop pre-copy needs to be completed, including: copying the memory page of the active virtual machine running on the source server to the destination server, and then copying the modified memory during the previous round of memory copy every subsequent cycle. Page (dirty page); Before the end of the circular copy, the source server notifies the virtual machine to migrate seamlessly. The active virtual machine migrates between the source server and the destination server and is about to hang. The manager of the virtual machine seamless migration will be active. The related migration information of the virtual machine is recorded in the migration virtual machine information table, and is ready to receive the data packet whose destination address is the active virtual machine.

 The manager active virtual machine that notifies the virtual machine to migrate seamlessly migrates between the source server and the destination server and is about to hang, and may be managed by the virtual cluster management server (if the virtual cluster management server participates in the virtual machine migration process) Completed, either by the source or destination server.

 The hang is: when the number of memory pages to be copied or the dirty page rate of the memory (the number of pages of dirty memory during each cycle divided by the number of pages of the required copy), when the predetermined threshold is met, the circular copy is stopped, and the source server is active. The virtual machine hangs and synchronizes the remaining memory pages and the status data (CPU status and non-contiguous memory pages) of the active virtual machine to the destination server at one time.

 Step S102: During the suspension of the active virtual machine, the manager that seamlessly migrates the virtual machine receives the data packet sent by the related network element and caches the data packet.

 Here, the related network element includes: a service function module, a router, a switch, a related gateway device, and/or a source server virtual machine manager;

The data packet is: the related network element acquires the address information of the manager that seamlessly migrates the virtual machine through the pre-configuration mode or the DNS mechanism, so as to seamlessly migrate to the virtual machine according to the address information of the manager that the virtual machine seamlessly migrates. The manager sends the data message. The data packet is sent in the following manner: The related network element forwards the data packet to the seamless migration manager of the virtual machine, and can adopt a source routing technology, such as a LSRR (Loose Source and Record Route). Either an IP tunneling technology (such as an IP packet) is sent to the destination VM or other data packet forwarding technology is used.

 The cache is: The time for the virtual machine seamless migration manager to cache the data messages sent to the active virtual machine can be pre-configured.

 Step S103: When the active virtual machine is migrated from the source server to the destination server and reactivated, the manager of the seamless migration of the virtual machine forwards the data packet to the active virtual machine according to the relevant migration information.

 In this step, after the destination server receives the status data of all the memory pages and the active virtual machine, the source server is notified to complete the virtual machine migration, and the source server confirms and releases the resources occupied by the active virtual machine. At the same time, the destination server activates the migrated active virtual machine, and connects the local device, such as the I/O port, to notify the related network element that the active virtual machine resumes normal operation; the active virtual machine on the destination server, that is, the migrated active virtual machine receives the virtual machine. The data packet forwarded by the seamlessly migrated manager continues to process the corresponding service. In the subsequent process, the active VM receives subsequent data packets sent by the relevant NE.

The forwarding channel of the data packet forwarded by the manager that receives the virtual machine seamlessly migrated by the migrated active virtual machine is: a mechanism used by the virtual machine seamless migration manager to send data packets to the active virtual machine. For the virtual machine migration in the network, because the IP address and MAC address of the active VM remain unchanged, the seamless migration manager of the VM can directly forward the original data packet (for sending, receiving, or forwarding data packets). The related network element to the virtual machine seamless migration manager adopts the source routing technology), or may forward the original packet after the IP packet is forwarded (for the network element to send, receive or forward the related network element to the virtual machine) The seamless migration manager uses IP tunneling technology, or other data packet forwarding technologies. For the migration of virtual machines across network segments, the IP address and/or MAC address of the active VM changes. The manager that seamlessly migrates VMs uses source routing technology, or uses IP tunneling technology, or uses other data packets. Forwarding technology, sending raw data messages to the new address of the active virtual machine. The policy of the seamless migration of the virtual machine forwards the cached data packet to the reactivated active virtual machine, including a caching mechanism, a forwarding mechanism, and a data packet forwarding technology. If the manager that seamlessly migrates the virtual machine caches the data packet for a certain period of time, it directly forwards the data packet to the migrated active virtual machine; or the manager that seamlessly migrates the virtual machine completes the processing and immediately moves to the migrated activity. The virtual machine forwards the data packet and ensures the reliability of the packet transmission by increasing the number of retransmissions or extending the retransmission timer. Or the manager of the seamless migration of the virtual machine specifies that the active virtual machine after the migration is received is re-established. After the activation notification, the data is forwarded to the active virtual machine.

 The following takes a detailed example to describe the process of seamless migration of active VMs during intra-network migration and cross-network segment migration.

 FIG. 4a is a flowchart of a process for seamless migration of an active virtual machine (indicated by virtual machine VM1 in FIG. 4a) during intra-network migration in this embodiment.

 For the virtual machine migration in the network, the IP address and MAC address of the VM are not changed. The external disk file of the VM system does not need to be migrated. The VM hang time is usually within 100 milliseconds during the migration. The manager of the virtual machine seamless migration needs to receive, cache, and forward data packets sent to the migrated virtual machine during the virtual machine suspension. During the intranet migration, the data packet processing process during the virtual machine suspension period is described as follows:

 Step S201: The virtual machine VM1 is pre-migrated, and completes copying of most memory pages.

 Step S202: The source server 1 notifies the virtual machine that the seamless migration of the virtual machine VM1 is suspended, and informs the address information of the VM 1 of the virtual machine.

 The address information includes an IP address and a MAC address of the virtual machine VM1.

 Step S203: The source server 1 notifies the related network element that the virtual machine VM1 is about to hang.

 Step S204: The virtual machine VM1 on the source server 1 is suspended, and the last unmigrated memory page and all the virtual machine state data are synchronized to the destination server 2.

The virtual machine state data includes a CPU state and a discontinuous memory page. Step S205: During the suspension of the virtual machine VM1, the related network element finds that the data packet sent to the virtual machine VM1 is unreachable, or the virtual machine VM1 is in the suspended state.

 For example: a virtual machine in a group interacts with an external network through a fixed gateway device, and the fixed gateway device can perceive the virtual machine VM1 to hang through the above mechanism; for example, the virtual machine manager of the source server receives the virtual server The data packet of the machine VM1 triggers the data packet forwarding mechanism of step S206.

 Step S206: The related network element forwards the data packet of the virtual machine VM1 to the manager of the seamless migration of the virtual machine.

 The manner in which the data packet is forwarded may be multiple, such as a source routing technology, a loose source and record route (LSRR), or an IP tunneling technology (such as an IP packet) sent to the destination virtual machine. Or other data packet forwarding technology.

 Step S207: The manager that seamlessly migrates the virtual machine receives and caches the data packet whose destination address is the virtual machine VM1.

 Step S208: The virtual machine VM1 migration of the source server 1 is completed, and the virtual machine VM1 on the destination server 2 is activated.

 Step S209: The destination server 2 notifies the virtual machine that the seamless migration of the virtual machine VM1 migration is completed and has been activated.

 Step S210: The destination server 2 notifies the related network element that the virtual machine VM1 migration is completed and has been activated.

 Step S211: The virtual machine seamless migration manager receives the virtual VM1 activation notification, and sends the original data packet to the virtual machine VM1 on the destination server 2.

 Step S212: The virtual machine VM1 on the destination server 2 returns a response message to the relevant network element according to the data packet type.

Step S213: The related network element directly sends the subsequent data packet to the virtual machine VM1 on the destination server 2. FIG. 4b is a process flow diagram of seamless migration of the active virtual machine (represented by the virtual machine VM1 in FIG. 4b) when the cross-network segment is migrated in this embodiment.

 For cross-segment VM migration, the IP address and/or MAC address of the VM before and after VM migration will change. The external disk file of the VM system needs to be migrated to another network segment. The VM hang time is relatively relative during the migration process. Longer. The manager for seamless migration of virtual machines needs to receive, cache, and forward data packets destined for the migrated virtual machine during the suspension of the migrated virtual machine. The data packet processing process during the suspension of the virtual machine in the network is described as follows:

 Step S301: The virtual machine VM1 is pre-migrated, and completes the external disk image file and a copy of most of the memory pages;

 Step S302: The source server 1 notifies the virtual machine VM1 that the seamless migration of the virtual machine is about to hang, and informs the virtual machine VM1 of the address information before and after the migration, including the IP address and MAC address before the migration of the virtual machine VM1, and the virtual machine VM1. The migrated IP address and MAC address;

 Step S303: the same step S203;

 Step S304: The virtual machine VM1 on the source server 1 hangs, and synchronizes the last unmigrated memory page and all the virtual machine state data to the destination server 2, including the CPU state and the discontinuous memory page, and the external disk mirroring. File write operation;

 Steps S305~310, the same steps S205~S210;

 Step S311: The virtual machine seamless migration manager receives the virtual VM1 activation notification, establishes an IP tunnel with the virtual machine VM1 on the destination server 2, and encapsulates the original data packet according to the content of the recorded migration virtual machine information table. deal with;

 Step S312: The virtual machine seamless migration manager encapsulates the buffered data packet and sends it to the destination server 2;

Step S313: The virtual machine manager in the destination server 2 unpacks the IP packet and delivers it to the virtual machine VM1. Step S314: The service running by the virtual machine VM1 in the destination server 2 returns a response message to the relevant network element according to the data packet type in step S313.

 Step S315: The subsequent data packet of the relevant network element is directly sent to the virtual machine VM1 on the destination server 2.

 The data packet forwarding process in steps S311-S312 can also be implemented by using a source routing technology. The virtual machine seamless migration manager inserts the destination server 2 into the cached routing path of the original data packet sent to the virtual machine VM1. After receiving the packet, the virtual machine manager on the destination server identifies that the packet should be sent to the local virtual machine VM 1 and passed to the virtual machine VM 1.

 In this embodiment, by deploying a seamless migration manager of the virtual machine on the network, the manager of the seamless migration of the virtual machine is notified of the address information of the active virtual machine that needs to be migrated before the active virtual machine of the source server is suspended, and the virtual machine has no virtual machine. The migration manager receives, caches, and forwards the data packets of the active virtual machine running the service during the suspension of the active virtual machine to ensure the continuity of the running of the active virtual machine, thereby solving the business data caused by the active virtual machine migration. Message loss problem.

 As shown in FIG. 5, an embodiment of the present invention provides a manager for seamless migration of a virtual machine, including: an address obtaining module 401, a receiving buffer module 402, and a packet forwarding module 403. The address obtaining module 401 is configured to: Obtain related migration information of the active virtual machine located on the source server;

 The receiving buffer module 402 is configured to receive a data packet sent by the related network element and cache the active virtual machine during the suspension period;

 The message forwarding module 403 is configured to receive the data packet buffered by the buffer module 402 according to the related migration information of the active virtual machine saved in the address obtaining module 401 when the active virtual machine is migrated from the source server to the destination server and is reactivated. Forward to the active virtual machine.

Further, the message forwarding module 403 is further configured to: when the active virtual machine is migrated from the source server to the destination server and reactivated, receive the active virtual machine activation notification sent by the destination server. In this embodiment, before the active virtual machine located at the source server is suspended, the address obtaining module 401 needs to be notified of the related migration information of the migrated active virtual machine, that is, the address information of the active virtual machine at the destination server.

 The address obtaining module 401 may notify the virtual cluster manager of the virtual cluster management server, the virtual machine manager of the source server, or the virtual machine manager of the destination server of the relevant migration information of the active virtual machine that needs to be migrated.

 The address obtaining module 401 may save the obtained related migration information in a migration virtual machine information table, so as to perform data packet forwarding and the like according to the related migration information in the migration virtual machine information table.

 For virtual machine migration in the network, that is, if the active virtual machine does not change the IP address and/or MAC address before and after the migration, the related migration information of the active virtual machine is mainly the address and status information of the active virtual machine, such as the active virtual machine. IP address, MAC address, migration status (suspended or reactivated). For virtual machine migration across network segments, that is, changing the IP address and/or MAC address before and after the active virtual machine migration, the related migration information of the active virtual machine is the address and status information before and after the active virtual machine migration, such as active virtual machine migration. The previous IP address and MAC address, the IP address and MAC address of the active virtual machine after migration, and the migration status (suspended or reactivated).

 Whether the active virtual machine is suspended by the source server, and the source server notifies the address acquisition module 401 of the manager of the seamless migration of the virtual machine. Before the active VM is suspended, you need to reserve the resources required for the active VM to run on the destination server, including memory, CPU, network, etc. If the resource reservation fails, stop the VM migration and feed back the result.

The address obtaining module 401 is specifically configured to: before the active virtual machine is suspended, before the end of the cyclic copy, the notification that the active virtual machine sent by the source server migrates between the source server and the destination server and is about to hang, The related information is recorded in the migration virtual machine information table, and the receiving buffer module 402 is configured to receive the data packet whose destination address is the active virtual machine. Correspondingly, the receiving buffer module 402 is further configured to receive the preparation sent by the address obtaining module 401. Receiving destination address is active Notification of the packet of the virtual machine.

 The receiving buffer module 402 is specifically configured to receive a data packet sent by the related network element and cache the data packet.

 The packet forwarding module 403 is configured to receive, after receiving the status data of all the memory pages and the active virtual machine, the notification that the destination server successfully migrates.

 The packet forwarding channel between the packet forwarding module 403 and the active virtual machine is a mechanism used for sending data packets to the active virtual machine. For the virtual machine migration in the network, the original virtual data packet can be forwarded directly because the IP address and MAC address of the active virtual machine are unchanged. The source routing technology is used for the data packets sent or forwarded by the related NE. Alternatively, the original packet may be extracted from the IP packet and then forwarded (for the case where the data packet sent or forwarded by the relevant network element adopts the IP tunnel technology) or other data packet forwarding technology. For the case of virtual machine migration across network segments, the IP address and/or MAC address of the active VM is changed, or the source routing technology is used, or the IP tunneling technology is used, or other data packet forwarding technologies are used to transmit the original data packet. The new address to the active virtual machine.

 The policy of the packet forwarding module 403 for forwarding the buffered data packet to the reactivated active virtual machine includes a caching mechanism, a forwarding mechanism, and a data packet forwarding technology. After the receiving buffer module 402 caches the data packet for a certain period of time, the packet forwarding module 403 directly forwards the data packet to the migrated active virtual machine; or after receiving the processing, the receiving buffer module 402 immediately passes the report. The forwarding module 403 forwards the data packet to the migrated active virtual machine, and ensures the reliability of the packet transmission by increasing the number of retransmissions or extending the retransmission timer; or receiving the buffer module 402, after receiving the migration After the active virtual machine is reactivated, the data message is forwarded to the active virtual machine.

 As shown in FIG. 6, the present invention further provides a system for seamless migration of a virtual machine, including: a source server 501, a destination server 502, and a manager for seamless migration of virtual machines 503;

The source server 501 is configured to complete the copy active virtual machine before the active virtual machine is migrated. After the predetermined memory page of the row reaches the destination server 502, the active virtual machine is suspended, and the remaining unmigrated memory pages and the state data of the active virtual machine are synchronized to the destination server 502;

 a virtual machine seamless migration manager 503, configured to acquire related migration information of the active virtual machine located on the source server 501; receive the data packet sent by the relevant network element and cache the active virtual machine during the suspension; When the virtual machine is migrated from the source server 501 to the destination server 502 and reactivated, the data packet is forwarded to the active virtual machine according to the relevant migration information;

 The destination server 502 is configured to activate the active virtual machine when the active virtual machine completes the migration. Further, the source server 501 is further configured to copy the memory page run by the active virtual machine to the destination server 502, and then copy the modified memory page during the previous round of memory copy each time; when the memory page needs to be copied When the number or the memory dirty page rate meets the predetermined threshold, the cyclic copy is stopped; correspondingly, the destination server 502 is further configured to receive and save the memory page of the active virtual machine sent by the source server 501.

 The destination server 502 is further configured to send an active virtual machine activation notification to the source server 501 and the virtual machine seamlessly migrated manager 503 when the active virtual machine is activated; correspondingly, the source server 501 is further configured to receive After the active virtual machine activates the notification, the resources occupied by the active virtual machine are released.

 In this embodiment, the source server 501, the destination server 502, and the seamless migration manager 503 of the virtual machine are combined with the related network elements to implement the seamless migration of the virtual machine. For details, refer to the content described in the foregoing embodiments, and details are not described herein. .

 The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and equivalent structural or process changes made by the present specification and drawings may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

Claim  A method for seamlessly migrating a virtual machine, the method comprising:  Obtain related migration information of the active virtual machine located on the source server;  Receiving, during the suspension of the active virtual machine, a data packet sent by the relevant network element, and caching; when the active virtual machine is migrated from the source server to the destination server and is reactivated, according to the related migration information. Forwarding the data message to the active virtual machine.  2. The method according to claim 1, wherein the related migration information of the active virtual machine comprises: an internet protocol IP address before the migration and/or migration of the active virtual machine, a medium access control MAC address, and/or Or migration status.  The method according to claim 1, wherein the obtaining the related migration information of the active virtual machine located on the source server comprises: sending the activity to be migrated by the virtual cluster management server, the source server or the destination server The related migration information of the virtual machine.  The method according to claim 1, wherein the related network element comprises: a service function module, a router, a switch, a related gateway device, and/or a source server virtual machine manager.  The method according to claim 1, wherein before the receiving the data packet sent by the related network element, the method further includes: the related network element adopts a pre-configuration manner or a domain name resolution service DNS mechanism, Obtaining address information, and sending the data packet according to the address information.  The method according to claim 1, wherein before the forwarding the data message to the active virtual machine, the method further comprises: receiving an active virtual machine activation notification sent by the destination server.  The method according to claim 1, wherein the data packet sent by the related network element comprises: the data packet sent by using a source routing manner or an IP tunneling manner. 8. A manager for seamless migration of a virtual machine, wherein the manager comprises: an address obtaining block, a receiving buffer module, and a packet forwarding module; An address obtaining module, configured to acquire an active migration information receiving cache module of the active virtual machine located on the source server, configured to receive a data packet sent by the related network element and cache the active virtual machine during the suspension;  a message forwarding module, configured to: when the active virtual machine is migrated from the source server to the destination server and reactivated, according to the related migration information of the active virtual machine saved in the address obtaining module, the receiving cache module is cached The data message is forwarded to the active virtual machine.  9. The manager of claim 8 wherein:  The message forwarding module is further configured to: when the active virtual machine is migrated from the source server to the destination server and reactivated, receive an active virtual machine activation notification sent by the destination server.  10. The manager of claim 8 wherein:  The address obtaining module is specifically configured to save the IP address, the MAC address, and/or the migration status before and/or after the migration of the active virtual machine as related migration information of the active virtual machine.  A system for seamlessly migrating a virtual machine, the system comprising: a source server, a destination server, and a seamless migration manager of the virtual machine; wherein:  The source server suspends the active virtual machine after the copying of the scheduled memory page of the active virtual machine to the destination server before the active virtual machine is migrated, and suspends the remaining unmigrated memory pages and activities The state data of the virtual machine is synchronized to the destination server;  The virtual machine seamless migration manager is configured to acquire related migration information of the active virtual machine located on the source server; receive the data packet sent by the relevant network element and cache the active virtual machine during the suspension period; Transmitting the data packet to the active virtual machine in the destination server according to the related migration information when the active virtual machine is migrated from the source server to the destination server and reactivated; The destination server, configured to activate the activity when the active virtual machine completes migration The virtual machine, as well as the data message sent by the manager that receives and saves the seamless migration of the virtual machine.  12. The system of claim 11 wherein:  The source server is further configured to copy a memory page run by the active virtual machine to the destination server, and then copy the modified memory page during a previous round of memory copy each time; when the number of memory pages to be copied is needed When the memory dirty page rate meets the predetermined threshold, the cyclic copy is stopped.  13. The system of claim 11 wherein:  The destination server is further configured to: when the active virtual machine is activated, send an active virtual machine activation notification to a manager that seamlessly migrates the source server and the virtual machine;  Correspondingly, the source server is further configured to release the resources occupied by the active virtual machine after receiving the active virtual machine activation notification;  The manager for seamlessly migrating the virtual machine is specifically configured to: when receiving the active virtual machine activation notification sent by the destination server, forward the data packet to the active virtual in the destination server according to the related migration information. machine.