CN106412114A - SDN based load balancing method and system - Google Patents
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- 230000004044 response Effects 0.000 claims abstract description 18
- 230000005012 migration Effects 0.000 claims description 12
- 238000013508 migration Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000012217 deletion Methods 0.000 claims description 7
- 230000037430 deletion Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
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- 238000004804 winding Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
Abstract
The invention provides an SDN based load balancing method and system. The system comprises a load balancing instance and a rear-end instance based on the SDN, and the load balancing instance is used to execute an IP virtual server function. High performance of LVS-DR mode load balancing is maintained via the SDN, an SDN controller issues a response reverse rule in advance, delay of a first packet in the SDN is avoided, and high-performance load balancing is realized.
Description
Technical field
The present invention relates to technique of internet field, more particularly, it relates to a kind of load-balancing method based on SDN and be
System.
Background technology
Load balancing is important technological means of network data processing aspect.Net can be extended using load balancing
The bandwidth of network equipment server, the handling capacity that increases, Strengthens network data-handling capacity, improve the motility of network and available
Property.In prior art, conventional two schemes are realizing load balancing.
Scheme one：In SDN, (abbreviation of Software Defined Networking, can be translated into：Software defined network
Network) in using the agent software such as Ningx proxy mode load balancing scheme, but these schemes are often because physical machine
Functional limitation, or the reason such as the two-way treatment technology problem of scheme leads to load-balancing performance not high, thus making load all
Weighing apparatus becomes the bottleneck in network.
Scheme two：LVS-DR (the letter of Linux Virtual Server-Direct Routing is adopted in legacy network
Claim, can be translated into：Linux virtual server direct routing) pattern load balancing scheme.The program is a kind of unidirectional loads equilibrium
Scheme, is that load balancing only processes user's request data and is balanced to back-end server, and response data is rear end directly rings
User's machine should be arrived.And the program is the Ipvs module using similar Iptables, is on-line operation in operating system
Kernel in, thus shortening the processing path in network protocol stack for the data.It is not as using softwares such as Nginx like that by number
Carry out load balancing according to being first sent to application layer parsing again.Therefore program ratio is used the agent softwares such as Nginx as load all
The performance of weighing apparatus will be high.But the configuration of the load balancing scheme of LVS-DR pattern is complicated, for example, need outer in load balancing machine
One unified virtual ip address is configured on the winding network interface card of net network interface card and back-end server.And can be only applied to legacy network
In, and may not apply to SDN.
Content of the invention
It is an object of the invention to provide a kind of load-balancing method based on SDN and system, can be applicable to SDN, and
Realize high-performance supported equilibrium.
To achieve these goals, the present invention provides following technical scheme：
A kind of load-balancing method based on SDN, including the load balancing example based on SDN and rear end example, institute
State load balancing example execution IP virtual server function, described load-balancing method comprises the following steps：
S1：SDN controller receives client request, judge described client request to be accessed be whether load balancing reality
Example, if so, enters step S2；If it is not, entering step S02；
S2：SDN controller issues F-rule, allows described client request be sent to load balancing example, enters step S3；
S02：Described SDN controller client request as described in specified logical process；
S3：Whether described SDN controller judges described load balancing example and described rear end example in same physics section
On point, if so, enter step S4, if it is not, entering step S04；
S4：Described SDN controller issues the first rule allows described client request to be sent to rear end example, and SDN controls
Device issues B-rule, enters step S5；
S04：Described SDN controller described client request from described load balancing example out when issue Second Rule
Making calls request is sent to the physical node that rear end example is located, and reaches rear end example place physics section in described client request
Issue three sigma rule and make to call request during point and be sent to rear end example, and SDN controller issues B-rule, enter step S5；
S5：Described SDN controller judges that whether described client is the example in the range of described SDN, in this way, enters
Step S6, if it is not, enter step S06；
S6：Described B-rule is issued to this thing when described client asks and reaches described rear end example place physical node
Reason node, B-rule makes rear end example directly transmit and is responsive to client；
S06：Described B-rule described client request from load balancing example out when, be issued to rear end example institute
In physical node, B-rule makes rear end example directly transmit and is responsive to client.
Further, after executing described step S6, enter step S7；
S7：Judge whether described client instance carries out migration action, in this way, enter step S8, such as no, end is processed；
S8：Described SDN controller issues deletion rule order, deletes the first rule issuing in described step S4 or step
The Second Rule issuing in S04, SDN controller re-issues rule of response in order to issue in covering step S4 or step S04
Rule of response.
Further, it is added with the Second Rule issuing in the first rule issuing in described step S4 or step S04
Mark, is identified for during the execution deletion action of step S8.
Further, in described step S04, described client request issues the when reaching rear end example place physical node
Three sigma rule makes to call request and is sent to rear end example, and changes the IP of rear end example for specifying IP.
Further, in described step S02, SDN controller is pressed and is specified logic, terminates described client request.
Further, in step S3, described load balancing example is processed to described client request using LVS algorithm
Afterwards, whether described SDN controller judges described load balancing example and described rear end example on same physical node.
Further, described B-rule has been described SDN controller anticipation described rear end example is receiving described client
The response sending during the request of end.
Further, including the load balancing example based on SDN and rear end example, described load balancing example execution
IP virtual server function, the described SiteServer LBS based on SDN adopts claim 1-7 methods described to realize load all
Weighing apparatus.
Further, the network interface card of described load balancing example is added with it and need to process the field of tcp port.
Further, described physical node represents the physical machine carrying example.
The load-balancing method based on SDN and system that the present invention provides, based on SDN so that inheriting LVS-DR mould
The high performance nature of formula load balancing, and the B-rule of response issues by SDN controller in advance, it is to avoid in SDN
First packet time delay, realizes high-performance supported equilibrium.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the load-balancing method described in embodiment one based on SDN；
Fig. 2 is the network architecture schematic diagram of the SiteServer LBS based on SDN；
Fig. 3 is the schematic flow sheet of the load-balancing method described in embodiment two based on SDN；
Fig. 4 is that the network of normal client example access load balancing flows to schematic diagram；
After Fig. 5 is migration client instance, the unenforced schematic diagram of embodiment two step S7；
After Fig. 6 is migration client instance, the executed schematic diagram of step S7 in example example two.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of not making creative work
Apply example, broadly fall into the scope of protection of the invention.
With reference to Fig. 1 and Fig. 2, the present embodiment proposes a kind of load-balancing method based on SDN, including based on SDN
Load balancing example and rear end example, load balancing example executes IP virtual server function, and load-balancing method includes following
Step：
S1：SDN controller receive client request, judge client request to be accessed whether be load balancing example,
If so, enter step S2；If it is not, entering step S02；
S2：SDN controller issues F-rule, allows client request be sent to load balancing example, enters step S3；
S02：SDN controller is pressed and is specified logical process client request；
S3：Load balancing example is processed to client request, and SDN controller judges that load balancing example and rear end are real
Example, whether on same physical node, if so, enters step S4, if it is not, entering step S04；
S4：SDN controller issues the first rule allows client request to be sent to rear end example, and SDN controller issues instead
To rule, enter step S5；
S04：SDN controller client request from load balancing example out when issue Second Rule and make the transmission that calls request
The physical node being located to rear end example, and issue three sigma rule when client request reaches rear end example place physical node
Make to call request and be sent to rear end example, and SDN controller issues B-rule, enter step S5；
S5：SDN controller judges that whether client is the example in the range of SDN, in this way, enters step S6, if it is not,
Enter step S06；
S6：B-rule is issued to this physical node when client asks and reaches rear end example place physical node, reversely
Rule makes rear end example directly transmit and is responsive to client；
S06：B-rule client request from load balancing example out when, be issued to rear end example place physics section
Point, B-rule makes rear end example directly transmit and is responsive to client.
The present embodiment load balancing example is based on SDN and executes IP virtual server function, and load balancing example can
It is the virtual machine carrying LVS-DR mode capabilities based on SDN, cloud platform basis can with the addition of on load balancing example
Rear end exemplary configuration IPVS module, allows its LVS function to come into force, it inherits LVS-DR mode load high performance nature in a balanced way,
Avoid the first packet time delay in SDN.Load balancing example based on SDN and rear end example eliminate traditional LVS-DR
Virtual IP address configuration in scheme.In step S4 or step S04, the meeting when issuing the first rule or Second Rule of SDN controller
Issue B-rule simultaneously, issued by F-rule and B-rule simultaneously, B-rule makes rear end example directly transmit
It is responsive to client, eliminating response first packet needs to access the operation of SDN controller.Provide high-performance supported side in a balanced way
Case.
The present embodiment eliminates the virtual ip address user of load balancing and rear end under traditional LVS-DR pattern certainly further
Row configuration, reduces operational error.
Step S5 of the present embodiment is mainly used in judging this physical node of issuing of B-rule, only real in load balancing
Example and rear end example, not in the case of Same Physical node, just trigger execution step S06.
With reference to Fig. 2, the network architecture of the SiteServer LBS based on SDN proposed by the present invention comprises located at physical node 1
Rear end example 1 and client 1 (abbreviation of client instance 1), the rear end example 2 located at physical node 2 and load balancing real
Client 2 in the range of example, SDN, client 2 is physical machine.Cloud platform create load balancing example when, by adjust
Notifying its this example with SDN control unit interface is load balancing example, and load balancing example adds to the network card configuration of this example
Loading equalizes the field of tcp port to be processed, and load balancing example represents based on SDN with LVS-DR mode capabilities
Virtual machine.
Load balancing example receive client 1 request, determine client 1 to be accessed be load balancing example, then
SDN controller issues F-rule, allows the request of client 1 (access 1：Rule 1) it is sent to load balancing example.If client 1
To be accessed is not load balancing example, can directly terminate handling process, or the request according to specified logical process client 1.
Then whether SDN controller can judge load balancing example and rear end example in identical physical node.Request as client 1
Rear end example 1 need to be issued to, because SDN controller judges load balancing example and rear end example 1 not in Same Physical node, so
SDN controller client 1 ask from load balancing example out when issue access 1：Rule 2 makes to call request and is sent to rear end in fact
The physical node 1 that example 1 is located, and issue access 1 when client request reaches rear end example place physical node 1：Rule 3 makes
Call request and be sent to rear end example 1, and SDN controller issues B-rule simultaneously.Then SDN controller judges client 1 whether
For the example in the range of SDN, because client 1 belongs to the example in the range of SDN, so B-rule is asked in client
It is issued to physical node 1, B-rule responds 1 when reaching rear end example 1 place physical node 1：Rule 4, B-rule makes
Rear end example 1 directly transmits and is responsive to client 1.
Load balancing example such as receives the request of client 2, determine client 2 to be accessed be load balancing example,
Then SDN controller issues F-rule, allows the request of client 2 (access 2：Rule 1) it is sent to load balancing example.If client
What end 1 was to be accessed is not load balancing example, can directly terminate handling process, or asking according to specified logical process client 2
Ask.Then whether SDN controller can judge load balancing example and rear end example in identical physical node.As client 2
Request need to be issued to rear end example 2, because SDN controller judges load balancing example and rear end example 2 with physical node 2, institute
Access 2 is issued with SDN controller：Rule 2 allows client request to be sent to rear end example 2, and SDN controller issues reverse rule
Then, then SDN controller judges that whether client 2 is the example in the range of SDN, because client 2 is not SDN scope
Interior example, B-rule client request from load balancing example out when, be issued to rear end example 2 place physical node 2,
B-rule makes rear end example 2 directly transmit and is responsive to client 2.
Embodiment two：
With reference to Fig. 3, on the basis of the open scheme of embodiment one, increase other steps.Specifically, after execution step S6,
Enter step S7；Step S7：Judge whether client instance carries out migration action, in this way, enter step S8, such as no, at end
Reason；Step S8：SDN controller issues deletion rule order, issues in the first rule issuing or step S04 in delete step S4
Second Rule, SDN controller re-issues rule of response in order to the rule of response issuing in covering step S4 or step S04.
It is the example in the range of the controlled SDN of SDN controller that step S8 only has when client, and when there is migration,
Just triggering execution.
Further, the Second Rule that issues in embodiment two can issue in step s 4 the first rule or step S04
Middle interpolation identifies, and is identified for during the execution deletion action of step S8, and then realizes precisely deleting.
The reason aforementioned rule is deleted is as follows：The second rule issuing in the first rule issuing in step S4 or step S04
Then there is the time-to-live.If client moves to the physical node of rear end example place from other physical nodes, and aforementioned rule
Then exist, the response that script aforementioned rule order rear end example sends, outlet originally to be guided, Er Feiyin can be directed to
Lead the client after migration.And the SDN controller of the present embodiment can be when client moves to, in delete step S4 or S04
The rule issuing.Here, when client sends request again, after step S4 of a new round or S04 are processed, originally rapid S4 or
The B-rule that S04 issues can be covered by new B-rule during retriggered.
With reference to Fig. 4, Fig. 5 and Fig. 6.The network that Fig. 4 accesses load balancing for normal client example flows to schematic diagram；Load
Equilibrium example receive client 1 request, determine client 1 to be accessed be load balancing example, then SDN controller issues
F-rule, allows the request (request rule 1) of client 1 be sent to load balancing example.SDN controller judges load balancing example
With rear end example 1 not in Same Physical node, SDN controller client 1 ask from load balancing example out when issue please
Ask rule 2 to make to call request and be finally sent to rear end example 1, and SDN controller issues B-rule simultaneously.Then SDN controller is sentenced
Disconnected client 1 belongs to the example in the range of SDN, so B-rule (being designated as rule of response in Fig. 4) is asked in client
It is issued to physical node 1, rule of response makes rear end example 1 directly transmit to be responsive to when reaching rear end example 1 place physical node 1
Client 1.
After Fig. 5 is migration client instance, the unenforced schematic diagram of step S7.The client 1 (example) of Fig. 5 is from Fig. 4's
Physical node 2 migrates to physical node 1, and client 1 (example) can be led to after migration again to send to load balancing example please
Ask, i.e. new request rule 1.
After Fig. 6 is migration client instance, the executed schematic diagram of step S7.Now, load balancing example receives migration
To the new request rule 1 of the client 1 of physical node 1, SDN controller issues deletion rule order, under deleting in Fig. 4 and Fig. 5
The request rule 2 put, and decentralization new request rule 2 makes client 1 ask finally to be sent to rear end from load balancing example again
Example 1, and SDN controller issues B-rule, SDN controller judges that the client 1 after migration belongs in the range of SDN
Example, so new B-rule covers the rule of response producing in Fig. 4, new rule of response makes rear end example 1 directly send out
Send and be responsive to client 1.
Embodiment three：
On the basis of the open scheme of embodiment one, in step S04, client request reaches rear end example place physics section
Issue three sigma rule during point and make to call request and be sent to rear end example, and to change the IP of rear end example be to specify IP.Specifically, can pass through
Cloud platform adds a virtual IP address specified on the winding network interface card of rear end example, and such as 1.1.1.1 is realizing, but virtual IP address is simultaneously
User is not needed voluntarily to configure.
Example IV：
On the basis of the open scheme of embodiment one, in step S02, SDN controller is pressed and specifies logical process client to ask
Ask, for directly terminating or client request can be closed.Certainly the processing mode specifying logic regulation can also be other operation sides
Formula, is not limited to terminate or closes client request.
Embodiment five：
On the basis of the open scheme of embodiment one, in step S3, load balancing example uses LVS algorithm that client is asked
Ask after being processed, whether SDN controller judges load balancing example and rear end example on same physical node.Certainly,
The present embodiment is not limited to LVS algorithm, and the other outside this algorithm can be used for based on SDN and adopts LVS-DR mode load
The algorithm of equalization scheme also includes the protection domain of the present embodiment.
In above-described embodiment one to five, B-rule can be to use anticipation algorithm, anticipation rear end by SDN controller
The response that example will send when receiving request.
Embodiment six：
The present embodiment proposes a kind of SiteServer LBS based on SDN, including the load balancing example based on SDN and
Rear end example, load balancing example execute IP virtual server function, the SiteServer LBS based on SDN adopt embodiment one to
In five, load-balancing method realizes load balancing.
When creating load balancing example, load balancing tcp port to be processed can be added to the network interface card of load balancing example
Field.Cloud platform can on load balancing example configuration of IP VS module, thus formed based on SDN carry LVS-DR pattern
The virtual machine of function.Eliminate the virtual IP address configuration in traditional LVS-DR scheme
Physical node in the present embodiment represents the physical machine carrying example.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one
The scope the widest causing.
Claims (10)
1. a kind of load-balancing method based on SDN it is characterised in that include load balancing example based on SDN and after
End example, described load balancing example executes IP virtual server function, and described load-balancing method comprises the following steps：
S1：SDN controller receive client request, judge described client request to be accessed whether be load balancing example,
If so, enter step S2；If it is not, entering step S02；
S2：SDN controller issues F-rule, allows described client request be sent to load balancing example, enters step S3；
S02：Described SDN controller client request as described in specified logical process；
S3：Described SDN controller judges described load balancing example and described rear end example whether on same physical node,
If so, enter step S4, if it is not, entering step S04；
S4：Described SDN controller issues the first rule allows described client request to be sent to rear end example, and under SDN controller
Send out B-rule, enter step S5；
S04：Described SDN controller described client request from described load balancing example out when issue Second Rule and make
Request is sent to the physical node that rear end example is located, and when described client request reaches rear end example place physical node
Issue three sigma rule and make to call request and be sent to rear end example, and SDN controller issues B-rule, enter step S5；
S5：Described SDN controller judges that whether described client is the example in the range of described SDN, in this way, enters step
S6, if it is not, enter step S06；
S6：Described B-rule is issued to this physics section when described client asks and reaches described rear end example place physical node
Point, B-rule makes rear end example directly transmit and is responsive to client；
S06：Described B-rule described client request from load balancing example out when, be issued to rear end example place thing
Reason node, B-rule makes rear end example directly transmit and is responsive to client.
2. the load-balancing method based on SDN according to claim 1 it is characterised in that：After executing described step S6,
Enter step S7；
S7：Judge whether described client instance carries out migration action, in this way, enter step S8, such as no, end is processed；
S8：Described SDN controller issues deletion rule order, deletes the first rule issuing in described step S4 or step S04
In the Second Rule that issues, SDN controller re-issues rule of response in order to the response issuing in covering step S4 or step S04
Rule.
3. the load-balancing method based on SDN according to claim 2 it is characterised in that：Issue in described step S4
It is added with mark in the Second Rule issuing in first rule or step S04, known for during the execution deletion action of step S8
Not.
4. the load-balancing method based on SDN according to claim 1 it is characterised in that：In described step S04, described
Client request issues three sigma rule and makes to call request when reaching rear end example place physical node and is sent to rear end example, and after changing
The IP of end example is to specify IP.
5. the load-balancing method based on SDN according to claim 1 it is characterised in that：SDN control in described step S02
Device processed is pressed and is specified logic, terminates described client request.
6. the load-balancing method based on SDN according to claim 1 it is characterised in that：In step S3, described load is all
After weighing apparatus example is processed to described client request using LVS algorithm, described SDN controller judges described load balancing example
With described rear end example whether on same physical node.
7. the load-balancing method based on SDN according to claim 1 it is characterised in that：Described B-rule is described
The response that SDN controller anticipation described rear end example sends when receiving described client request.
8. a kind of SiteServer LBS based on SDN it is characterised in that：Including the load balancing example based on SDN and after
End example, described load balancing example executes IP virtual server function, described adopts right based on the SiteServer LBS of SDN
1-7 methods described is required to realize load balancing.
9. the SiteServer LBS based on SDN according to claim 8 it is characterised in that：Described load balancing example
Network interface card is added with it and need to process the field of tcp port.
10. the SiteServer LBS based on SDN according to claim 8 it is characterised in that：Described physical node represents and holds
Carry the physical machine of example.
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