CN107846445A - A kind of server load balancing method based on SDN - Google Patents
A kind of server load balancing method based on SDN Download PDFInfo
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- CN107846445A CN107846445A CN201710851133.3A CN201710851133A CN107846445A CN 107846445 A CN107846445 A CN 107846445A CN 201710851133 A CN201710851133 A CN 201710851133A CN 107846445 A CN107846445 A CN 107846445A
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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
- H04L67/101—Server selection for load balancing based on network conditions
-
- 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
- H04L67/1017—Server selection for load balancing based on a round robin mechanism
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
- H04L63/0227—Filtering policies
- H04L63/0236—Filtering by address, protocol, port number or service, e.g. IP-address or URL
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
- H04L63/0227—Filtering policies
- H04L63/0245—Filtering by information in the payload
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a kind of server load balancing method based on SDN, including：Pre-set Server Default maximum bandwidth and access load threshold；Controller carries out visiting measurement living in real time using ARP detections mechanism to server；Controller is monitored in real time to whole network, grasps network traffics and server dynamic change at any time；Controller is conducted interviews from the minimum server of load factor as optimal service device, is polled if server load rate；When packet is sent from client host, optimal path is selected to be forwarded, forwarding port optiaml ciriterion is that flow load is minimum；Use NAT Mapping implementation server virtual IP functions；When thering is super-flow or blacklist main frame to access, then carry out fire wall and intercept discarding.The present invention can carry out monitoring uninterrupted in real time to server cluster, and flow is reasonably allocated to each server and link, server in whole network and link are monitored by controller, can calculate optimal service device and optimal path.
Description
Technical field
The invention belongs to webserver load balancing field, more particularly to one kind to be based on SDN's (software defined network)
Server load balancing method designs.
Background technology
Nowadays the rise of various new network applications, the portfolio of legacy network is increasing, but network bandwidth and
The disposal ability of server is but far away from the growth rate of network access data flow.With the continuous consumption of server resource,
Also internet security is made to have a greatly reduced quality.A kind of cheap effectively transparent method being derived for this situation is existing to extend
The bandwidth of the network equipment and server, increase handling capacity, Strengthens network data-handling capacity, the flexibility for improving network and available
The technology of property is exactly load balancing (Load Balance).
The development foundation of load balancing is exactly load-balancing algorithm.Server load balancing algorithm have it is a lot (continuation
With non-standing), including Round-Robin Algorithm, minimum join algorithm, response time algorithm, hashing algorithm, minimum connection error calculation
Method, link bandwidth algorithm etc..Wherein polling algorithm belongs to a kind of static load-balancing algorithm, i.e. activity is predictable,
When there is service attachment request, according to polling algorithm, service request is sent to each node in turn, i.e., each node is selected
Probability be 1/N, the algorithm with simple realization load balancing and can be easy to calculate the load factor of each node.Polling algorithm is only
Suitable for performance cluster identical network.In addition real server (RealServer) can be allocated different weightings
Value adjusts allocated flow.For example the high large server of performance can configure larger weighted value, and it is that performance is relatively low
Small server sets less weighted value.Can be that real server specifies maximum in order to avoid server collapses because of overload
Threshold value is connected to avoid the server overload.Any server can be designated as the backup server or spilling of another server
Server, so as to further ensure application availability.Although it is equal to implement effective server load in legacy network
Weighing apparatus, but can not neatly optimize load balancing allocation strategy, and can solves this and asked well under SDN
Topic.
The content of the invention
The purpose of the present invention is to realize a kind of server load balancing method based on SDN, and server cluster can be carried out
Flow, is reasonably allocated to each server and link by monitoring uninterrupted in real time.
To achieve the above object, the technical solution adopted by the present invention is a kind of server load balancing method based on SDN,
Specifically comprise the steps of：
S1：Controller pre-sets parameter, including the maximum bandwidth of each server, load factor threshold value；
S2：Controller is monitored in real time to whole network, grasps network traffics and server dynamic change at any time；
S3：Controller carries out detection measurement to server in real time using ARP detections mechanism；
S4：Controller is conducted interviews from the minimum server of load factor as optimal service device, if server load rate
It is identical, it is polled；
S5：When already present optimal service device load factor reaches threshold value, then according to poll and minimum link number rule
Carry out next server selection；
S6：When packet is sent from client host, controller can select optimal path to be forwarded, and forwarding port is most
Excellent criterion is that flow load is minimum；
S7：Use NAT Mapping implementation server virtual IP functions；
S8：When thering is super-flow or blacklist main frame to access, then carry out fire wall and intercept discarding.
Further, above-mentioned server maximum bandwidth represents each server total bandwidth size, wherein the access thresholds generation
The maximum load rate that each server of table can bear.
Further, above-mentioned load factor threshold value is server maximum load rate, and server load rate can be represented with following formula：
Further, above-mentioned ARP explorers are made as when server receives the ARPRequest reports of subscriber's main station active initiation
Wen Shi, it is on the contrary then unavailable if server response user's ARPReply messages, show that server can use.
The ARPRequest is broadcast packet, due to using virtual ip address, causing the object that it is inquired not same
LAN, router are provided with proxy ARP service.
Further, the minimum server of above-mentioned load factor can be used to lower three conditions and be judged：
1. selected server is whether in freelist, if available, next comparison is carried out；
2. whether current server load factor is less than the threshold size of its setting, if being less than, next comparison is carried out；
3. whether optimal service device has been present or server load rate is more than the load factor of known preferred server, if
It there has been no optimal service device or meet load factor minimum, then the server can be judged as to optimal service device.
Further, above-mentioned poll and minimum link number rule refer to that controller is selected by server load rate minimum principle
Optimal service device is selected, when there is next new user service connection request, judges current to provide the service of access according to controller
Whether server exceedes the load threshold set, and this TV station server providing services are still selected if not exceeding, if if
The maximum server of flow remaining bandwidth is selected to provide access request in remaining server, by that analogy.
Further, above-mentioned NAT mappings refer to that user can only be realized when accessing by the IP outside server, double by issuing
External IP is carried out to flow table to be mapped and converted with the actual server ip for providing access.
Further, above-mentioned super-flow is to exceed maximum total bandwidth or the load threshold that each server is set, described black
Name single host is the main frame being present on blacklist.
The blacklist is that default access host IP address, the main frame deposited on the blacklist block without exception on the controller
Cut, forbid conducting interviews to server.
Compared with prior art, the invention has the advantages that：
1. the present invention is monitored by controller to server in whole network and link, optimal service can be calculated
Device and optimal path；
2. flow table characteristic is issued using SDN, the reasonable layout data flow on each available path and server, so as to
Solves the network overload condition of individual server；
3. ensureing link safety, super large malicious traffic stream is rejected, networking and server are played while load balancing
Protective effect.
Brief description of the drawings
Fig. 1 is the server load balancing method block diagram based on SDN that embodiment of the present invention provides；
Fig. 2 is the server load balancing best server and forward-path based on SDN that embodiment of the present invention provides
Select flow chart；
Fig. 3 is the server load balancing network core algorithm flow chart based on SDN that embodiment of the present invention provides.
Embodiment
For clearly displaying objects and advantages of the present invention more directly perceived, below in conjunction with embodiment of the present invention
The present invention will be described in detail for accompanying drawing, it is clear that and described embodiment is a part of embodiment of the present invention, rather than entirely
The embodiment in portion.Based on the embodiment in the present invention, those of ordinary skill in the art are not before creative work is made
The every other embodiment obtained is put, belongs to the scope of protection of the invention.
As shown in figure 1, a kind of server load balancing method based on SDN of the present embodiment proposition, the load applied are equal
The method of accounting combines bandwidth threshold method and polling algorithm, and method includes：
Server Default maximum bandwidth and access thresholds are pre-set first；Threshold value is server maximum load rate, respectively
Server load rate is calculated as follows formula：
Controller carries out visiting measurement living in real time using ARP detections mechanism to server, when server receives subscriber's main station
It is on the contrary if server response user's ARPReply messages, show that server can use during the ARPRequest messages actively initiated
It is then unavailable.
Controller is monitored in real time to whole network, grasps network traffics and server dynamic change at any time；
Controller is conducted interviews from optimal service device；
Wherein optimal service device criterion：Whether selected server is in freelist；It is if available, if current clothes
Device load factor of being engaged in is less than the threshold size of its setting；If it is less than, if optimal service device has existed or server load rate
More than the load factor of known preferred server.If there has been no optimal service device or meet load factor minimum, this can be taken
Business device is judged as optimal service device.
Controller selects optimal path to be forwarded, and forwarding port optiaml ciriterion is that flow load is minimum；
When thering is super-flow or blacklist main frame to access, then carry out fire wall and intercept discarding.The fire wall is to beyond institute
The user for having server load threshold value, which accesses, to be blocked, and the blacklist is default access host ip on the controller
Location, the main frame deposited on the blacklist intercept without exception, forbid conducting interviews to server；
Controller issues flow table according to above-mentioned rule and selects path according to corresponding flow table to OpenFlow interchangers, interchanger
And server carries out converting flow；
NAT Mapping implementation server virtual IP functions are used after determining best server, protect real server address not
Leak；
The virtual ip address to be formed is mapped by NAT, causes the object that ARPRequest broadcast packets are inquired not same
LAN, router are provided with proxy ARP service.
By above-mentioned function, in the present embodiment, the server load balancing method based on SDN of proposition can be examined effectively
Network wide parameters dynamic change is surveyed, and server is protected by, realizes safe server load balancing.
With reference to figure 2, the present embodiment proposes a kind of server load balancing method based on SDN, best server and forwarding
Path flow is as follows：
S0:When main frame sends packet, controller first can carry out ARP and visit work, it is ensured that and the server is available server,
If server can use, into step S1, if unavailable, into step S6；
S1:Controller judges that current server load factor is less than the threshold size of its setting, if being less than, into step
S2, it is on the contrary then enter step S6；
S2:Controller judges that optimal service device has been present or server load rate is more than the negative of known preferred server
Load rate.If there has been no optimal service device or meet load factor minimum, the server can be judged as to optimal service device, entered
Enter step S3, if not selecting optimal service device, into step S6；
S3：Controller judges whether router port flow load is minimum, if so, then select the route to be forwarded,
Into step S4, it is on the contrary then selection enter step S5；
S4:The best server service of conducting interviews；
S5:Select next port.
S6:Next server is selected, into step S0, if Servers-all does not comply with, packet discard.
By above-mentioned flow, best server and optimal quasi- hair path can be selected.
With reference to figure 3, the present embodiment proposes a kind of server load balancing method based on SDN, the load balancing applied
Algorithm combines bandwidth threshold method and polling algorithm, and algorithmic method is as follows：
Controller obtains optimal service device by above-mentioned steps S1~S6, is attached service, therefore be not repeated herein；
When there is new user service connection request, the uninterrupted of connection is asked according to monitoring user in real time, to judge
Whether the current server for providing the service of access exceedes the load threshold set；
Not beyond still selection this TV station server providing services, and real-time tracking customer flow；
It is that it selects load factor minimum service device to provide service or directly blocked because flow is excessive if flow is excessive
Cut, so circulation.
Therefore Smallest connection load-balancing method design of the kind of embodiment of the present invention based on SDN, lead to
Controller is crossed to server in whole network and link, optimal service device and optimal path are calculated, flow reasonable distribution
To each server and link, so as to realize the load balancing of server.
Each embodiment in this specification is described by the way of progressive, identical similar between each embodiment
Part mutually referring to what each embodiment stressed is the difference with other embodiment.
Finally it should be noted that：Described above is only the preferred embodiment of the present invention, for the common of the art
For technical staff, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these are improved and profit
Decorations also should be regarded as protection scope of the present invention.
Claims (10)
- A kind of 1. server load balancing method based on SDN, it is characterised in that comprise the steps of：S1：Controller pre-sets parameter, including the maximum bandwidth of each server, load factor threshold value；S2：Controller is monitored in real time to whole network, grasps network traffics and server dynamic change at any time；S3：Controller carries out detection measurement to server in real time using ARP detections mechanism；S4：Controller is conducted interviews from the minimum server of load factor as optimal service device, if server load rate is identical Then it is polled；S5：When already present optimal service device load factor reaches threshold value, then carried out according to poll and minimum link number rule Next server selection；S6：When packet is sent from client host, controller can select optimal path to be forwarded, and forward the optimal standard in port It is then minimum for flow load；S7：Use NAT Mapping implementation server virtual IP functions；S8：When thering is super-flow or blacklist main frame to access, then carry out fire wall and intercept discarding.
- 2. the server load balancing method according to claim 1 based on SDN, it is characterised in that the server is most Big bandwidth represents each server total bandwidth size, is born wherein the access thresholds represent the maximum that each server can bear Load rate.
- 3. the server load balancing method according to claim 1 based on SDN, it is characterised in that the load factor threshold Value is server maximum load rate, and server load rate can be represented with following formula：
- 4. the server load balancing method according to claim 1 based on SDN, it is characterised in that the ARP explorers It is made as when server receives the ARPRequest messages that subscriber's main station is actively initiated, if server response user ARPReply Message, then show that server can use, it is on the contrary then unavailable.
- 5. the server load balancing method according to claim 4 based on SDN, it is characterised in that described ARPRequest is broadcast packet, due to using virtual ip address, causing the object that it is inquired not in same LAN, router It is provided with proxy ARP service.
- 6. the server load balancing method according to claim 1 based on SDN, it is characterised in that the load factor is most Small server can be used to lower three conditions and be judged：1. selected server is whether in freelist, if available, next comparison is carried out；2. whether current server load factor is less than the threshold size of its setting, if being less than, next comparison is carried out；3. whether optimal service device has been present or server load rate is more than the load factor of known preferred server, if also not Optimal service device be present or meet load factor minimum, then the server can be judged as to optimal service device.
- 7. the server load balancing method according to claim 1 based on SDN, it is characterised in that the poll and Minimum link number rule refers to that controller selects optimal service device by server load rate minimum principle, next new when having During user service connection request, judge whether the current server for providing the service of access exceedes the load threshold set according to controller Value, this TV station server providing services are still selected if not exceeding, if selection flow is remaining in remaining server if The maximum server of bandwidth provides access request, by that analogy.
- 8. the server load balancing method according to claim 1 based on SDN, it is characterised in that the NAT, which maps, is Referring to can only be realized when user accesses by the IP outside server, and visit is provided with actual by issuing two-way flow table progress external IP The server ip asked is mapped and converted.
- 9. the server load balancing method according to claim 1 based on SDN, it is characterised in that the super-flow Exceed maximum total bandwidth or the load threshold that each server is set, the blacklist main frame is the master being present on blacklist Machine.
- 10. the server load balancing method according to claim 9 based on SDN, it is characterised in that the blacklist is Default access host IP address, the main frame deposited on the blacklist intercept without exception on the controller, forbid visiting server Ask.
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Cited By (9)
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| CN110290071A (en) * | 2019-07-24 | 2019-09-27 | 中国联合网络通信集团有限公司 | Method and system, cloud server and the monitoring device of network flow equilibrium adjustment |
| CN110933128A (en) * | 2019-10-08 | 2020-03-27 | 网宿科技股份有限公司 | Node traffic scheduling method and device, electronic equipment and storage medium |
| CN111200655A (en) * | 2019-12-31 | 2020-05-26 | 北京奇才天下科技有限公司 | Intranet access method, system and electronic equipment based on proxy server |
| CN111866096A (en) * | 2020-07-02 | 2020-10-30 | 广州市挖米科技有限责任公司 | Load balancing method and device for medical system |
| CN112311674A (en) * | 2019-07-31 | 2021-02-02 | 北京华为数字技术有限公司 | Message sending method, device and storage medium |
| CN112437137A (en) * | 2020-11-12 | 2021-03-02 | 翱捷科技(深圳)有限公司 | Internet of things data connection method and system |
| CN113038424A (en) * | 2019-12-23 | 2021-06-25 | 成都鼎桥通信技术有限公司 | Calling method and device for LTE-R and GSM-R dual-mode terminal |
| CN113938953A (en) * | 2021-09-28 | 2022-01-14 | 苏州大学 | Fiwi network load balancing method and system based on edge calculation |
| CN114500340A (en) * | 2021-12-23 | 2022-05-13 | 天翼云科技有限公司 | Intelligent scheduling distributed path calculation method and system |
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| CN113038424A (en) * | 2019-12-23 | 2021-06-25 | 成都鼎桥通信技术有限公司 | Calling method and device for LTE-R and GSM-R dual-mode terminal |
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| CN111866096A (en) * | 2020-07-02 | 2020-10-30 | 广州市挖米科技有限责任公司 | Load balancing method and device for medical system |
| CN112437137A (en) * | 2020-11-12 | 2021-03-02 | 翱捷科技(深圳)有限公司 | Internet of things data connection method and system |
| CN113938953A (en) * | 2021-09-28 | 2022-01-14 | 苏州大学 | Fiwi network load balancing method and system based on edge calculation |
| CN113938953B (en) * | 2021-09-28 | 2022-07-12 | 苏州大学 | Fiwi network load balancing method and system based on edge calculation |
| CN114500340A (en) * | 2021-12-23 | 2022-05-13 | 天翼云科技有限公司 | Intelligent scheduling distributed path calculation method and system |
| CN114500340B (en) * | 2021-12-23 | 2023-08-04 | 天翼云科技有限公司 | Intelligent scheduling distributed path calculation method and system |
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