CN101465812B - Redirection method for virtual machine network connection when on-line migrating striding sub network - Google Patents

Redirection method for virtual machine network connection when on-line migrating striding sub network Download PDF

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Publication number
CN101465812B
CN101465812B CN2009100762292A CN200910076229A CN101465812B CN 101465812 B CN101465812 B CN 101465812B CN 2009100762292 A CN2009100762292 A CN 2009100762292A CN 200910076229 A CN200910076229 A CN 200910076229A CN 101465812 B CN101465812 B CN 101465812B
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virtual machine
subnet
home agent
agent
registration request
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CN101465812A (en
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沃天宇
怀进鹏
李沁
李博
温抿雄
胡春明
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Beihang University
Beijing University of Aeronautics and Astronautics
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Beihang University
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Abstract

The invention relates to a method for redirecting network connection of a virtual machine when being transferred across subnets online, including the steps that: 1, the virtual machine is transferred from a first subnet to a second subnet; 2, a foreign agent arranged in the second subnet sends a registration request to a home agent in the first subnet; 3, after receiving the registration request,the home agent builds a bidirectional data transmission tunnel between the home agent and the foreign agent; 4, the data to be sent to the virtual machine by a communication counterpart terminal is first sent to the home agent and then is sent to the foreign agent by the home agent through the bidirectional data transmission tunnel, and the foreign agent sends the received data to the virtual machine. The method is unnecessary to change the operating system of the virtual machine, can ensure the transparency to the virtual machine in the network redirection process when transferring the virtual machine across the subnets, and can overcome the defect in prior art that data is forwarded between the communication counterpart terminal and the virtual machine through a source host, which leadsto the increase of the load of the source host.

Description

Virtual machine network connects reorientation method when striding the online migration of subnet
Technical field
The present invention relates to virtual machine technique, relate in particular to a kind of when striding the online migration of subnet virtual machine network connect reorientation method.
Background technology
Under the background of Internet technology develop rapidly, the calculating under the distributed environment is showed its importance and the demand of meeting the tendency widely day by day.But the dynamic and the isomerism of the physical resource layer that wide area distributes are again unmodifiable reality, and therefore, the traditional calculating pattern is demonstrating its increasing limitation.In the traditional calculating pattern; Software is bundled on the bottom hardware with tightly coupled mode, no matter is single cpu mode, the multi-machine collaborative pattern; Or networked patterns such as cluster, all the characteristics such as isomerism, dynamic and distributivity with hardware resource have very big contradiction.So new computation schema---virtual computing technique is arisen at the historic moment.
Utilize Intel Virtualization Technology, can shield of the influence of the isomerism of hardware effectively upper layer software (applications).The effect that the while virtual machine also has isolation software is deployed in the operation each other of the software in the different virtual machine on the same physical host with influencing.Now, the speed of the update of hardware resource is very fast, and problems such as hardware fault, equipment downtime maintenance possibly occur.In the face of the problems that hardware resource occurs often, the online migrating technology of virtual machine just nature has been carried.Utilize online migrating technology, can tackle the challenge that the dynamic of hardware is brought, let the running status of upper layer software (applications) operation need not the variation of perception bottom hardware resource.And under the network environment of complicacy; How can let virtual machine between network, move fast, pellucidly; Thereby can make up flexible, virtual network topology; And then masking of the influence of the distributivity of hardware resource to running software, this just must study how to utilize various virtual networks connection redirecting techniques.
At present, how to realize that the network that virtual machine is striden when subnet is online to be moved connects the redirected hot research problem that become.
Prior art one provides a kind of virtual proprietary network (Virtual Private Network; Be called for short VPN) technical scheme; This scheme belongs to after the source of virtual machine end main frame and migration and sets up a VPN passage between the destination main frame, and like this, the virtual machine after the migration just can be connected in the network at end main frame place, source through the VPN passage; So just can be transparent to virtual machine, the access to netwoks mode need not change.But the problem that this scheme is brought is: behind the virtual machine (vm) migration, source end main frame still needs transmission network and the mutual message of virtual machine, and this can increase the live load of source end main frame, thereby can reduce the runnability of entire environment.
Prior art two provides a kind of dynamic IP tunnel configuration method, is specially: virtual machine (vm) migration arrives after the new subnet, dynamically sets up a tunnel between the physical host at virtual machine place and the PERCOM peripheral communication opposite end.The shortcoming of this method is that the configuration behavior in tunnel can not keep transparent to the communication node of outside.
Prior art three provides a kind of mobile IP technology, and this technology is regarded virtual machine as in the network mobile node, lets virtual machine move the mobile IP protocol stack in the transition process, moves thereby be implemented between the different sub-network, reaches the purpose that continues to keep communication.But, this scheme need be in virtual machine the installation and moving IP stack, promptly need revise VME operating system.
Summary of the invention
The objective of the invention is to the problem that exists in the prior art; Provide a kind of when striding the online migration of subnet virtual machine network connect reorientation method; Need not revise VME operating system; Can in the virtual machine (vm) migration process, keep the IP address of virtual machine constant, keep virtual machine (vm) migration to operating in the transparency of the program in the virtual machine, and can reduce the load of the mutual message of source end main frame transmission network and virtual machine behind virtual machine (vm) migration.
To achieve these goals, the invention provides a kind of when striding the online migration of subnet virtual machine network connect reorientation method, comprising:
Step 1, virtual machine are moved to second subnet from first subnet;
Step 2, the home agent of external agent in being arranged on said first subnet that is arranged in said second subnet are initiated the proxy registration request message, comprise in the said proxy registration request message: the IP address of said virtual machine, said external agent's IP address, the term of validity and the authorization information of this registration;
Step 3, said home agent after receiving said proxy registration request message, set up and said external agent between the bidirectional data transfers tunnel;
Step 4, the data that Correspondent Node is desired to send to said virtual machine send to said home agent earlier; And sending to said external agent through said bidirectional data transfers tunnel by said home agent, said external agent sends to said virtual machine with the data that receive.
Said step 3 specifically comprises: the correctness of authorization information in the said proxy registration request message that said home agent checking receives; If said authorization information is correct; And the value of the term of validity is greater than 0 described in the said proxy registration request message; The IP address of the said virtual machine that then said home agent basis parses from said proxy registration request message and said external agent's IP address, the bidirectional data transfers passage between foundation and the said external agent.
The present invention provides that virtual machine network connects reorientation method when striding the online migration of subnet; Home agent and the bidirectional data transfers tunnel between the external agent in second subnet in first subnet have been set up; Like this; If Correspondent Node has the virtual machine after data need send to migration, can send to home agent earlier so, home agent sends the data to the external agent through the bidirectional data transfers tunnel then; And then send the data to virtual machine by the external agent, that has realized that virtual machine network connects is redirected.In this process, the IP address of virtual machine does not change, can guarantee for the transparency that operates in the program in the virtual machine, and keep with migration after the outside communication node of subnet between the communicating by letter of close friend.Behind virtual machine (vm) migration; The redirected of virtual machine network is to be realized with the external agent who is arranged in second subnet by the home agent that is arranged in first subnet; Need not the participation of virtual machine; The network redirection process is transparent to virtual machine in the time of can guaranteeing virtual machine (vm) migration like this, and after network redirection, and the outside Correspondent Node of second subnet sends to the data of virtual machine can be through transmitting between home agent and the external agent; The source end main frame that need not in first subnet is participated in data forwarding, and having overcome needs remote host to transmit the defective that data cause source end main unit load to increase behind the virtual machine (vm) migration in the prior art.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Shown in Figure 1 when striding the online migration of subnet for the present invention virtual machine network connect reorientation method embodiment one flow chart;
Shown in Figure 2 when striding the online migration of subnet for the present invention virtual machine network connect the Redirectional system structural representation;
Shown in Figure 3 when striding the online migration of subnet for the present invention virtual machine network connect reorientation method embodiment two flow charts.
Embodiment
Virtual machine network connects reorientation method embodiment one flow chart when being illustrated in figure 1 as the present invention and striding the online migration of subnet, comprising:
Step 1, virtual machine are moved to second subnet from first subnet;
Step 2, the home agent of external agent in being arranged on first subnet that is arranged in second subnet are initiated register requirement;
Step 3, home agent after receiving register requirement, set up and the external agent between the bidirectional data transfers tunnel;
Step 4, the data that Correspondent Node is desired to send to virtual machine send to home agent earlier, and send to the external agent by home agent through the bidirectional data transfers tunnel, and the external agent sends to virtual machine with the data that receive.
Through above method; Set up home agent and the bidirectional data transfers tunnel between the external agent in second subnet in first subnet, like this, if Correspondent Node has the virtual machine after data need send to migration; Can send to home agent earlier so; Home agent sends the data to the external agent through the bidirectional data transfers tunnel then, and then sends the data to virtual machine by the external agent, and it is redirected to have realized that virtual machine network connects.In this process, the IP address of virtual machine does not change, can guarantee for the transparency that operates in the program in the virtual machine, and keep with migration after the outside communication node of subnet between the communicating by letter of close friend.Behind virtual machine (vm) migration; The redirected of virtual machine network is to be realized with the external agent who is arranged in second subnet by the home agent that is arranged in first subnet; Need not the participation of virtual machine; The network redirection process is transparent to virtual machine in the time of can guaranteeing virtual machine (vm) migration like this, and after network redirection, and the outside Correspondent Node of second subnet sends to the data of virtual machine can be through transmitting between home agent and the external agent; The source end main frame that need not in first subnet is participated in data forwarding, and having overcome needs remote host to transmit the defective that data cause source end main unit load to increase behind the virtual machine (vm) migration in the prior art.
Virtual machine network connects the reorientation method realization flow when introducing the present invention below in detail and striding the online migration of subnet.
Virtual machine network connects the Redirectional system structural representation when being illustrated in figure 2 as the present invention and striding the online migration of subnet, and in this system, home agent 211 is arranged in first subnet 21, and external agent 221 is arranged in second subnet 22; Home agent 211 is used to safeguard virtual machine address binding message, and simultaneously, the end as the bidirectional data transfers tunnel carries out data encapsulation and decapsulation; External agent 221 is used to find the network insertion of virtual machine, initiates register requirement to home agent, as an end in bidirectional data transfers tunnel, carries out data encapsulation and decapsulation simultaneously.Communicate between Correspondent Node 24 and the virtual machine 23.
In the system shown in Figure 2, at first, virtual machine is initiated the migration from the source end main frame of first subnet to the destination main frame of second subnet; Virtual machine continues on the end main frame of source, to move; Virtual machine (vm) migration finishes then, and virtual machine stops on the end main frame of source and moves, and virtual machine network connects interruption.
Then, virtual machine starts on the destination main frame, and begins to start virtual machine network.Virtual machine network connects reorientation method embodiment two flow charts when being illustrated in figure 3 as the present invention and striding the online migration of subnet, comprising:
Step 101, virtual machine activation network, activation external agent's register requirement function.
Step 102, external agent are with IP address (the Home Address of virtual machine; Abbreviation HoA), external agent's itself IP address (Care-of Address; Abbreviation CoA), the term of validity (Lifetime) field of this registration and the log-on message of authorization information virtual machines such as (Identification) are encapsulated into UDP (User Datagram Protocol; Abbreviation UDP) in the message; UDP message after the encapsulation is called proxy registration request (Proxy Registration Request is called for short PRRQ) message, sends this PRRQ message to home agent then.
Step 103, home agent are received the PRRQ message that the external agent sends; Parse virtual machine and external agent's IP address, and, this PRRQ message is carried out verification of correctness through analysis verification information (Identification); If checking is passed through, then execution in step 104; Otherwise, execution in step 109.
Whether step 104, home agent judge the value of the term of validity (Lifetime) field in the PRRQ message greater than 0, if the value of the term of validity (Lifetime) field greater than 0, shows that then this PRRQ message is a register requirement, execution in step 105; If it is to remove register requirement, execution in step 111 that the value of the term of validity (Lifetime) field, then shows this PRRQ message smaller or equal to 0.
Step 105, home agent inquire address binding information database; Judge whether to exist the IP address information of virtual machine; If there has been the IP address information of this virtual machine; Then according to the value of the term of validity (Lifetime) field in the value scheduler binding information database of the term of validity (Lifetime) field in the PRRQ message, execution in step 107; Otherwise, execution in step 106.
Step 106, home agent increase virtual machine (HoA, CoA, the term of validity (Lifetime)) clauses and subclauses in the address binding information database.
Step 107, home agent structure registration reply message; Be that agency of trademark registration is replied (ProxyRegistration Reply; Be called for short PRRP) message; In this PRRP message, insert information such as new authorization information (Identification), virtual machine IP address (the IP address of the virtual machine in the IP address of this virtual machine and the PRRQ message is identical), the IP address of home agent, the sign that succeeds in registration, this PRRP message is sent to the external agent.Simultaneously, the bidirectional data transfers tunnel between setting up from the home agent to external agent upgrades the routing iinformation of the IP address of relevant virtual machine, and virtual machine network connects and recovers.
Step 108, external agent analyze the PRRP message of receiving, find to succeed in registration, if succeed in registration for the first time, then the external agent upgrades the routing iinformation of relevant HoA.The external agent periodically initiates register update to home agent then, is used for prolonging the term of validity of the virtual machine log-on message of register requirement, and promptly repeated execution of steps 102; Through repeated execution of steps 102 when home agent is initiated register update; The PRRQ message in home agent forwarding step 102 periodically particularly; The time interval of twice PRRQ message transmission should can reach the purpose of the term of validity of the log-on message that prolongs the virtual machine in the register requirement like this less than the value of the term of validity (Lifetime) field in the preceding PRRQ message that once sends.
Step 109, home agent structure PRRP message are wherein inserted the registration failure sign, and the PRRP message is sent to the external agent.
Step 110, external agent analyze the PRRP message of receiving and find registration failure, initiate register requirement again, execution in step 102.
Step 111, home agent are deleted this virtual machine (HoA, CoA, the term of validity (Lifetime)) clauses and subclauses in the address binding information database.
If virtual machine is out of service or move out of second subnet, then can activates the external agent and initiate virtual machine releasing registering functional.The external agent is encapsulated into the IP address (HoA) of virtual machine, external agent's itself IP address (CoA), the term of validity (Lifetime) field and authorization information (Identification) etc. in the UDP message, i.e. PRRQ message, and send it to home agent.The value of the term of validity in the PRRQ message (Lifetime) field is set to 0, shows that this PRRQ message is the message that registration is removed in request.Home agent is after receiving that this is used to contact the PRRQ message of registration; (HoA, CoA, the term of validity (Lifetime)) clauses and subclauses of this virtual machine of deletion in the address binding information database; The home agent deletion is deleted the bidirectional data transfers tunnel about the HoA routing iinformation of this virtual machine.
In step 101 virtual machine activation network; Home agent can be waited for the PRRQ message from the external agent in background process; Home agent safeguards that in background process is removed a registered events formation simultaneously, if expire the releasing registered events, then home agent is deleted the (HoA that relates in this releasing registered events in the address binding information database; CoA, the term of validity (Lifetime)) clauses and subclauses.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.

Claims (3)

1. a virtual machine network when striding the online migration of subnet connects reorientation method, it is characterized in that, comprising:
Step 1, virtual machine are moved to second subnet from first subnet;
Step 2, the home agent of external agent in being arranged on said first subnet that is arranged in said second subnet are initiated the proxy registration request message, comprise in the said proxy registration request message: the IP address of said virtual machine, said external agent's IP address, the term of validity and the authorization information of this registration;
Step 3, said home agent after receiving said proxy registration request message, set up and said external agent between the bidirectional data transfers tunnel;
Step 4, the data that Correspondent Node is desired to send to said virtual machine send to said home agent earlier; And sending to said external agent through said bidirectional data transfers tunnel by said home agent, said external agent sends to said virtual machine with the data that receive;
Said step 3 specifically comprises: the correctness of authorization information in the said proxy registration request message that said home agent checking receives; If said authorization information is correct; And the value of the term of validity is greater than 0 described in the said proxy registration request message; The IP address of the said virtual machine that then said home agent basis parses from said proxy registration request message and said external agent's IP address, the bidirectional data transfers passage between foundation and the said external agent.
2. according to claim 1 when striding the online migration of subnet virtual machine network connect reorientation method; It is characterized in that; Also comprise: said external agent periodically initiates register update, the term of validity that prolongs the virtual machine log-on message in the said proxy registration request message to said home agent.
3. according to claim 1 when striding the online migration of subnet virtual machine network connect reorientation method, it is characterized in that said proxy registration request message is a user datagram protocol message.
CN2009100762292A 2009-01-06 2009-01-06 Redirection method for virtual machine network connection when on-line migrating striding sub network Expired - Fee Related CN101465812B (en)

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