CN102662751A - Method for improving availability of virtual machine system based on thermomigration - Google Patents
Method for improving availability of virtual machine system based on thermomigration Download PDFInfo
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Abstract
The invention provides a method for improving availability of a virtual machine system based on thermomigration. The method comprises the following steps: firstly, before a main virtual machine is started, a main virtual machine image file on a source server is copied onto a backup server and then the virtual machine system is started; the system can start a source virtual machine to operate on a master server; a backup virtual machine is switched to a suspension state on a backup server and a synchronous engine is started in the background to carry out heartbeat monitoring, high-frequency thermomigration and synchronization of image files; and once the crash of the virtual machine on the master server is found, the backup virtual machine on the backup server is recovered to an operation state from the suspension state immediately so as to provide service outwards, therefore the high availability of the virtual machine is realized.
Description
Technical field
The present invention relates to computer virtual machine technology field, specifically a kind of method that improves based on thermophoresis dummy machine system availability.
Background technology
Develop rapidly along with computer and network technologies; Especially the appearance of polycaryon processor makes the performance of physical machine rapidly promote; But traditional use-pattern often fails to make full use of the ability of physical machine; So Intel Virtualization Technology occurred, it can move a plurality of virtual computer systems (abbreviation virtual machine) on the single physical machine, has improved the utilization factor of physical machine greatly.Utilize Intel Virtualization Technology to realize encapsulation in addition, can shield the influence that the hardware of isomery brings software software, the operation that a plurality of virtual machines that on same physical machine, move can be independent of each other, this has just improved the security and the manageability of software.
Traditional high-availability system all is high available to what use on the market, and all needs extra script to monitor to the high available of application, and the script of different application monitoring is also different, and this has just brought inconvenience to the widespread adoption of high-availability system.Through Intel Virtualization Technology, concrete application is encapsulated into virtual machine inside, the height through virtual machine can be used to guarantee the high available of virtual machine in house software, so just need not the application of being concerned about that virtual machine inside varies.Ensured the high available of virtual machine, just ensured the high available of virtual machine internal application, this is the high available a kind of new thinking that provides of software.
Existing virtual machine high-availability system all is an image file of depositing virtual machine through sharing, does not so just need extra means to guarantee the inconsistent problem of the memory image on the different machines.After the virtual machine on the main frame is delayed machine, on standby host, restart virtual machine again according to image file.This mode that restarts is the easiest implementation, but the startup of virtual machine needs the time, and this has just caused the downtime of service longer.
Summary of the invention
The purpose of this invention is to provide the method for a kind of raising based on thermophoresis dummy machine system availability.
The objective of the invention is to realize that by following mode the nucleus module of total system is a synchronization engine, synchronization engine is divided into three parts: check whether fault of host virtual machine through heartbeat inspecting; Realize the synchronous of internal memory through thermophoresis; Realize through the snapshot of mirror image active and standby machine memory image synchronously;
The heartbeat inspecting of synchronization engine: along with the operation of virtual machine; When its content modification to a certain degree the time, will in disk mirroring, write back data, the data in magnetic disk that the heartbeat inspecting module is responsible for monitoring host virtual machine writes back; In case find that disk writes back the appearance time-delay or the time of exceeding the estimates does not have data to write back toward disk; Assert that then this virtual machine breaks down, with the recovering state of backup virtual machine, service outwards is provided immediately from suspending; Take over the virtual machine of fault, thereby the inefficacy that realizes virtual machine is switched;
The thermophoresis module of synchronization engine: so-called virtual machine thermophoresis, exactly the virtual machine of running status is moved to destination server from source server and move, virtual machine need not to stop running basically in this process; Be the memory information with the virtual machine of source server end, be copied to destination server through the network iteration, the process need of this iteration is carried out repeatedly almost consistent until the internal storage data of both sides virtual machine; Close the virtual machine of source server end this moment, and destination server end virtual machine is opened, and whole process is called the thermophoresis of virtual machine; In this article, the iteration that the internal storage data of host virtual machine is not stopped is copied in the backup virtual machine, realizes that the internal storage data of active and standby virtual machine is synchronous; In addition in order to receive the internal storage data of coming synchronously; Backup virtual machine can not be closed, and should be in halted state, in the middle of all data terminate-and-stay-residents; In case host virtual machine fault; Backup virtual machine is directly switch to running status from halted state, and this handoff procedure is very of short duration, and this also just shortens the switching time of virtual-machine fail greatly;
The mirror image synchronization module of synchronization engine; The file that will at every turn write back the host virtual machine disk mirroring exactly carries out snapshot one time, then with snapshot synchronously to the backup virtual machine end, then backup virtual machine regularly with snapshot restore to disk mirroring; Thereby realize active and standby virtual machine disk mirroring synchronously; What mirror snapshot was preserved is the modification content of virtual machine image, is based on the preserving type of increment, so the synchronous time can be not oversize; At the backup virtual machine end memory buffers is arranged in addition, the snapshot that backup is come reaches certain degree and recovers to raise the efficiency again;
System building method based on the virtual machine of thermophoresis is following: at first before starting host virtual machine, the host virtual machine image file on the source server is copied on the backup server, just opens dummy machine system this moment; Operation can be opened with source virtual machine by system on master server, on backup server, will be equipped with virtual machine and switch to halted state, and start synchronization engine on the backstage; Carry out heartbeat inspecting; High-frequency thermophoresis and synchronous mirror file, the machine in case the virtual machine on the discovery master server is delayed then returns to running status with the virtual machine that is equipped with on the backup server from halted state immediately; Service outwards is provided, realizes the high available of virtual machine;
Specifically may further comprise the steps:
(1) at first select a backup physical server, create the backup virtual machine of source virtual machine, backup virtual machine is in non-active state;
(2) source virtual machine is realized snapshot, preserve internal storage data;
(3) snapshot data is sent to the backup virtual machine that backs up physical server through synchronization engine;
(4) backup virtual machine synchronisation snapshot data;
(5) high-frequency execution in step 2,3,4;
(6) when fault took place, backup virtual machine transferred active state to.
Through the thermophoresis of frequent virtual machine, be positioned at two virtual machines on the physical server synchronously, its data are consistent.
High available realization is left intact to the data of virtual machine inside, and is transparent fully to the application of virtual machine inside.
Need not to adopt and share the image file of depositing virtual machine, be positioned at the image file of virtual machine on the different physical machine synchronously through the mode of mirror snapshot, thereby improve availability.
The invention has the beneficial effects as follows: the present invention is directed to through sharing storage, restart the virtual machine high-availability system that the mode of virtual machine realizes, propose a kind of virtual machine high-availability system and its implementation based on thermophoresis.
Existing virtual machine high-availability system all is through the use shared storage device, and main frame can be visited identical virtual machine image file with standby host and realized high available.In the present invention; Through the mode of Network Synchronization, after the image file of virtual machine changes, at first write back local disk; Mode with snapshot arrives backup machine with the increment of revising through Network Synchronization then; Backup machine returns snapshot restore to disk again, and this process is carried out synchronously, has so just guaranteed the consistance of memory image of the active and standby machine in strange land.And such Network Synchronization mode need not used shared storage device yet, has saved the hardware spending.
Existing virtual machine high-availability system is after the virtual machine on the main frame is delayed machine, on standby host, restarts.Just caused the start-up time of new virtual machine the inner service of virtual machine will inevitably produce interruption, and the time is longer.In the present invention, through frequent virtual machine thermophoresis, the virtual machine that remains on the standby host is in halted state, rather than stopped status.After the virtual machine on the main frame was delayed machine, the virtual machine on the standby host directly changed running status over to from halted state, and the time almost can ignore, thereby had realized that the real machine of not delaying height is available.
Description of drawings
Accompanying drawing 1 is a virtual machine high-availability system configuration diagram;
Accompanying drawing 2 is a disk synchronization principles synoptic diagram in the virtual machine high-availability system.
Embodiment
Explanation at length below with reference to Figure of description method of the present invention being done.
Configuration diagram of the present invention is shown in accompanying drawing 1, and the nucleus module of total system promptly is a synchronization engine.Synchronization engine is divided into three parts: check whether fault of host virtual machine through heartbeat inspecting; Realize the synchronous of internal memory through thermophoresis; Realize through the snapshot of mirror image active and standby machine memory image synchronously.
At first introduce the heartbeat inspecting of synchronization engine:, when its content modification arrives to a certain degree, will in disk mirroring, write back data along with the operation of virtual machine.The data in magnetic disk that the heartbeat inspecting module is responsible for monitoring host virtual machine writes back; In case find that disk writes back the appearance time-delay or the time of exceeding the estimates does not have data to write back toward disk; We just can assert that this virtual machine breaks down, and with the recovering state of backup virtual machine from suspending, service outwards are provided immediately; Take over the virtual machine of fault, thereby the inefficacy that realizes virtual machine is switched.
The thermophoresis module of synchronization engine: so-called virtual machine thermophoresis, exactly the virtual machine of running status is moved to destination server from source server and move, virtual machine need not to stop running basically in this process.Its principle promptly is the memory information with the virtual machine of source server end; Be copied to destination server through the network iteration; The process need of this iteration is carried out repeatedly almost consistent until the internal storage data of both sides virtual machine; Close the virtual machine of source server end and the unlatching of destination server end virtual machine this moment, and whole process is called the thermophoresis of virtual machine.In the present invention, utilize its principle that the iteration that the internal storage data of host virtual machine does not stop is copied in the backup virtual machine, realize that the internal storage data of active and standby virtual machine is synchronous.In addition in order to receive the internal storage data of coming synchronously; Backup virtual machine can not be closed, and should be in halted state, in the middle of all data terminate-and-stay-residents; In case host virtual machine fault; Backup virtual machine is directly switch to running status from halted state, and this handoff procedure is very of short duration, and this also just shortens the switching time of virtual-machine fail greatly.
The mirror image synchronization module of synchronization engine; The file that will at every turn write back the host virtual machine disk mirroring exactly carries out snapshot one time; Then with snapshot synchronously to the backup virtual machine end, then backup virtual machine regularly with snapshot restore to disk mirroring, thereby realize active and standby virtual machine disk mirroring synchronously.What mirror snapshot was preserved is the modification content of virtual machine image, is based on the preserving type of increment, so the synchronous time can be not oversize.At the backup virtual machine end memory buffers is arranged in addition, the snapshot that backup is come reaches certain degree and is recovering, and can raise the efficiency.
Virtual machine high-availability system building method based on thermophoresis is following: at first before starting host virtual machine; Host virtual machine image file on the source server is copied on the backup server; Just can open the virtual machine high-availability system this moment; Operation can be opened with source virtual machine by system on master server, on backup server, will be equipped with virtual machine and switch to halted state.And start synchronization engine on the backstage, carry out heartbeat inspecting, high-frequency thermophoresis and synchronous mirror file.The machine in case the virtual machine on the discovery master server is delayed then returns to running status with the virtual machine that is equipped with on the backup server from halted state immediately, and service outwards is provided, and realizes the high available of virtual machine.
Except that the described technical characterictic of instructions, be the known technology of those skilled in the art.
Claims (4)
1. a raising is characterized in that based on the method for thermophoresis dummy machine system availability the nucleus module of total system is a synchronization engine, and synchronization engine is divided into three parts: check whether fault of host virtual machine through heartbeat inspecting; Realize the synchronous of internal memory through thermophoresis; Realize through the snapshot of mirror image active and standby machine memory image synchronously;
The heartbeat inspecting of synchronization engine: along with the operation of virtual machine; When its content modification to a certain degree the time, will in disk mirroring, write back data, the data in magnetic disk that the heartbeat inspecting module is responsible for monitoring host virtual machine writes back; In case find that disk writes back the appearance time-delay or the time of exceeding the estimates does not have data to write back toward disk; Assert that then this virtual machine breaks down, with the recovering state of backup virtual machine, service outwards is provided immediately from suspending; Take over the virtual machine of fault, thereby the inefficacy that realizes virtual machine is switched;
The thermophoresis module of synchronization engine: so-called virtual machine thermophoresis, exactly the virtual machine of running status is moved to destination server from source server and move, virtual machine need not to stop running basically in this process; Be the memory information with the virtual machine of source server end, be copied to destination server through the network iteration, the process need of this iteration is carried out repeatedly almost consistent until the internal storage data of both sides virtual machine; Close the virtual machine of source server end this moment, and destination server end virtual machine is opened, and whole process is called the thermophoresis of virtual machine; In this article, the iteration that the internal storage data of host virtual machine is not stopped is copied in the backup virtual machine, realizes that the internal storage data of active and standby virtual machine is synchronous; In addition in order to receive the internal storage data of coming synchronously; Backup virtual machine can not be closed, and should be in halted state, in the middle of all data terminate-and-stay-residents; In case host virtual machine fault; Backup virtual machine is directly switch to running status from halted state, and this handoff procedure is very of short duration, and this also just shortens the switching time of virtual-machine fail greatly;
The mirror image synchronization module of synchronization engine; The file that will at every turn write back the host virtual machine disk mirroring exactly carries out snapshot one time, then with snapshot synchronously to the backup virtual machine end, then backup virtual machine regularly with snapshot restore to disk mirroring; Thereby realize active and standby virtual machine disk mirroring synchronously; What mirror snapshot was preserved is the modification content of virtual machine image, is based on the preserving type of increment, so the synchronous time can be not oversize; At the backup virtual machine end memory buffers is arranged in addition, the snapshot that backup is come reaches certain degree and recovers to raise the efficiency again;
System building method based on the virtual machine of thermophoresis is following: at first before starting host virtual machine, the host virtual machine image file on the source server is copied on the backup server, just opens dummy machine system this moment; Operation can be opened with source virtual machine by system on master server, on backup server, will be equipped with virtual machine and switch to halted state, and start synchronization engine on the backstage; Carry out heartbeat inspecting; High-frequency thermophoresis and synchronous mirror file, the machine in case the virtual machine on the discovery master server is delayed then returns to running status with the virtual machine that is equipped with on the backup server from halted state immediately; Service outwards is provided, realizes the high available of virtual machine;
Specifically may further comprise the steps:
(1) at first select a backup physical server, create the backup virtual machine of source virtual machine, backup virtual machine is in non-active state;
(2) source virtual machine is realized snapshot, preserve internal storage data;
(3) snapshot data is sent to the backup virtual machine that backs up physical server through synchronization engine;
(4) backup virtual machine synchronisation snapshot data;
(5) high-frequency execution in step 2,3,4;
(6) when fault took place, backup virtual machine transferred active state to.
2. method according to claim 1 is characterized in that, through the thermophoresis of frequent virtual machine, is positioned at two virtual machines on the physical server synchronously, and its data are consistent.
3. method according to claim 1 is characterized in that, high available realization is left intact to the data of virtual machine inside, and is transparent fully to the application of virtual machine inside.
4. method according to claim 1 is characterized in that, need not to adopt to share the image file of depositing virtual machine, is positioned at the image file of virtual machine on the different physical machine synchronously through the mode of mirror snapshot, thereby improves availability.
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