CN101431532A - Content routing method, load balancing equipment and resource management equipment - Google Patents
Content routing method, load balancing equipment and resource management equipment Download PDFInfo
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Abstract
The invention discloses a content routing method, load balancing equipment and resource management equipment in content distribution network. The content routing method comprises: GSLB receives domain name resolution request from LDNS and select SLB according to resource dispensing strategy based on resource information coming from resource management equipment; returns the SLB to browser via LDNS; the browser sends content request to the SLB; the SLB selects cache servers according to local resource distribution strategy and based on local resource information from resource management equipment, and forwards the content request to cache server. The content routing method and equipment in content distribution network of the invention harmonizes new demand and existing technology, protects original investment, endows original system with higher performance, implements fine dispatching for dispensing content routing and service ability for abstract resource of CDN.
Description
Technical field
(Content DeliveryNetwork, CDN) technology relate in particular to a kind of content routing method, load-balancing device and asset management device of content distributing network to the present invention relates to content distributing network in the data communication field.
Background technology
CDN, promptly content distributing network is by increase the new network architecture of one deck in existing network, with the content release of website near user's network " edge ", make the user can obtain required content nearby, solve the network congestion situation, improve the response speed of user capture website.Solution is little owing to the network bandwidth comprehensively technically, the user capture amount is big, the unequal reason of network point distribution, the slow problem of response speed of the user capture website of causing.
Usually (Server Load Balancer, SLB) all kinds of caching servers with some constitute the CDN node by server load balancing equipment.Server load balancing equipment is the management equipment and the passage of node, needs the resource operating position of this node of monitoring, and with information report GSLB (Global Server Load Balance, GSLB).Load-balancing device is finished the scheduling of intranodal user capture simultaneously, the load of each caching server of balance.
On business model, CDN mainly obtains income by signing service contract with the client.The client of CDN network is distributed to its content (Streaming Media, application or webpage) on each node of CDN network by the service ability of renting the CDN network in order to improve user experience.Usually the bandwidth gain that is obtained from the CDN network with the client between client and the CDN operator or the CDN resource of customer use are as the clearing foundation.
In present CDN network, after the client submitted the CDN service request to, the CDN system manager need be according to the request of service provider (SP), and the device resource of inquiring about and add up each node takies situation, carried out business and carried out to have determined whether enough resources.After resource is confirmed, also need to adopt the mode that manually adds that CDN service equipment (mainly being cache server (Cache)) is added a Cache servers group, the content that the user need quicken is just finished by this Cache servers group.Then, the keeper sets up content and quickens rule, then with the equipment of these rule downloadings to the Cache servers group according to the service request information that SP provides.When the configuration of all devices all after the success, business can be opened.This way makes business management system (BSS) and OSS (OSS) not divide clearly, causes service logic unintelligible, increases the complexity of management system.In service fulfillment process each time, service management person needs by hand large number quipments to be operated, and service fulfillment speed is slow, and efficient is low, is easy to generate mistake.Owing to lack a resource general view, the equipment component in the network makes that through regular meeting's off-capacity customer resources is difficult to ensure.
Summary of the invention
The technical problem that the present invention will solve provides the content routing method in a kind of content distributing network, and the performance of content distribution network system can be provided.
The invention provides the content routing method in a kind of content distributing network, comprising: GSLB receives the domain name mapping request from local dns, according to from the resource information of asset management device, select SLB according to resource allocation policy; GSLB returns the SLB that selects to browser by LDNS, and browser sends content requests to SLB; After SLB receives content requests,, content requests is transmitted to cache server according to from the local resource information of asset management device, according to local resource allocation policy selection cache server.
Further, asset management device obtains resource information from GSLB, SLB and cache server, and the resource information of collecting is handled, and gives GSLB with the global resource distribution of information, and local resource information is sent to SLB.
Further, asset management device is to GSLB distributed resources allocation strategy; Asset management device is to SLB distribution local resource allocation strategy.
Content routing method provided by the invention, collect resource information by asset management device, and be distributed to load-balancing device, and select appropriate nodes equipment by load-balancing device according to resource information of receiving and predetermined resource allocation policy, improved systematic function and efficient.
The present invention also provides a kind of load-balancing device, comprising: the information acquisition module is used to obtain resource information; Node is selected module, is used to receive route requests, the resource information of obtaining according to the information acquisition module, selects node device according to resource allocation policy; The request forwarding module is used to receive route requests and the node device of selecting module from node, and route requests is transmitted to node device.
Further, this load-balancing device also comprises: the allocation strategy receiver module, be used to receive resource allocation policy, and resource allocation policy is sent to node select module; Node is selected module, is used to receive route requests, and the resource information of obtaining according to the information acquisition module, the resource allocation policy that receives according to the allocation strategy acquisition module are selected node device.
The present invention also provides a kind of asset management device, comprising: the resource information acquisition module is used for obtaining resource information from GSLB, server load balancing and cache server; The resource information distribution module, the resource information that is used for obtaining according to the resource information acquisition module generates global resource information and local resource information, give GSLB with the global resource distribution of information, give server load balancing the local resource distribution of information.
Further, this asset management device also comprises: the allocation strategy distribution module is used for to GSLB distributed resources allocation strategy, to described server load balancing distribution local resource allocation strategy.
Load-balancing device of the present invention and asset management device can be applied to content routing method of the present invention and content distributing network.
Description of drawings
Fig. 1 is the system construction drawing of content distributing network of the present invention;
Fig. 2 is the flow chart of an embodiment of the content routing method of content distributing network of the present invention;
Fig. 3 is the flow chart of another embodiment of the content routing method of content distributing network of the present invention;
Fig. 4 is the structure chart of an embodiment of load-balancing device of the present invention;
Fig. 5 is the structure chart of another embodiment of load-balancing device of the present invention;
Fig. 6 is the structure chart of an embodiment of asset management device of the present invention;
Fig. 7 is the structure chart of another embodiment of asset management device of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.In the accompanying drawings, identical label is represented identical assembly or element.
Basic thought of the present invention is to increase the resource abstract concept in CDN, and configuration device is abstract with statistics and management resource.Resource is abstract to be exactly service ability such as concurrent, the storage among the CDN, bandwidth are set up model, with the above-mentioned resource of unified management.
Fig. 1 is the system construction drawing of content distributing network of the present invention.As shown in Figure 1, this system comprises asset management device 11, GSLB 12, SLB 13 and cache server 14.Wherein, asset management device 11 is collected resource information from GSLB 12, SLB 13 and Cache 14, and for example the memory capacity of node, memory capacity have been used percentage, CPU usage, outlet total bandwidth, bandwidth utilization rate etc.Asset management device 11 gathers the resource information of collecting with arrangement, and the global resource distribution of information to GSLB 12, is arrived SLB 13 with the local resource distribution of information relevant with SLB 13.GSLB 12 selects suitable SLB according to the global resource information that receives, according to predetermined resource allocation policy the domain name mapping request is handled.SLB 13 selects appropriate C ache equipment, for the user provides content service according to the local resource information that receives, according to predetermined local resource allocation strategy content requests is handled.The local resource allocation strategy of the resource allocation policy of GSLB 12 and SLB 13 can preestablish, also can be by asset management device 11 to GSLB 12 and SLB 13 distributions or renewal.For example, the resource allocation policy of GSLB or SLB can be set at: under property principle nearby, preferentially select the low node of CPU usage; Perhaps under property principle nearby, preferentially select the big node of available bandwidth; Perhaps preferentially select the low node of CPU usage; If the difference of each node cpu utilization rate is (for example in 5%～10%) within the specific limits, preferentially select the big node of available bandwidth; If each node bandwidth usage variance when (for example in 5%～10%), is preferentially selected the big node of free memory within the specific limits.In through the node of selecting after the above-mentioned selection, select the final node that distributes.Resource allocation policy take the form of node selection algorithm, output is the enabled node table, comprises the node listing that can satisfy resource requirement in the table.According to resource allocation policy the CDN node is screened according to resource information, The selection result is the enabled node ordered list.GSLB and SLB return to user's access node and select from this node listing.
Fig. 2 is the flow chart of an embodiment of the content routing method of content distributing network of the present invention.
As shown in Figure 2, in step 202, GSLB receives the domain name mapping request from LDNS (local dns), and the GSLB basis is from the resource information of asset management device, according to resource allocation policy selection SLB.Webpage in the user capture portal server is selected browsed content; User browser response user selects, to LDNS request domain name analysis; The domain name mapping request is forwarded to GSLB through LDNS; GSLB carries out property judgement nearby to the domain name analysis request, according to the SLB of resource information and the suitable user capture of resource allocation policy selection.
In step 204, GSLB returns SLB to browser by LDNS, and browser sends content requests to this SLB.
In step 206, after SLB receives content requests,, content requests is transmitted to this Cache equipment according to from the local resource information of asset management device, according to local resource allocation policy selection Cache equipment, provide content service by this Cache equipment.
Fig. 3 is the flow chart of another embodiment of the content routing method of content distributing network of the present invention.
As shown in Figure 3, in step 302, asset management device sends to GSLB (304a) in the system with the global resource allocation strategy, and the local resource allocation strategy is sent to SLB (304b); SLB needs the resource allocation policy relevant with Cache is transmitted to Cache (304c) after receiving resource allocation policy.Realize by managing SLB that in system's resource management just often when the unusual and Cache operate as normal of SLB, resource management can move down, and directly Cache is distributed.
In step 304, after increasing the abstract and resource management of resource, asset management device needs (for example regular) isochronous resources operating position, obtains the resource information of each equipment in the system.The isochronous resources operating position comprises with the synchronous also exchange message (302a) of GSLB, to SLB collection and exchange message (302b), arrives Cache acquisition of information (302c).Asset management device obtains resource information from GSLB, SLB, Cache, and the resource operating position is gathered, and the resource information after optimizing and revising is distributed to GSLB and SLB respectively.
In step 306, the user selects to browse the content of CDN carrying by access customer web page access CDN.
In step 308, user browser response user selects, and CDN is carried the territory of content to LDNS request domain name analysis.
In step 310, LDNS transmits the domain name mapping request according to the dns resolution path, finally sends to the mandate dns resolution server in this territory, i.e. GSLB among the CDN;
In step 312, after receiving the domain name mapping request, GSLB can finish the judgement of property nearby to the domain name mapping request under the restriction in conjunction with resource allocation policy, selects to be fit to the node SLB address of user capture.Because what GSLB received only is domain-name information, the part that resource allocation this moment can be applied to the processing of content route mainly is the service that has distributed on which node this territory, this for when exist among the CDN a large amount of only in the part of nodes application during client of service, can play good preliminary filtering function.
In step 314, domain name mapping result (address of SLB) is transmitted LDNS.
In step 316, LDNS returns to user browser with the result.
In step 318, user browser substitutes former domain name with analysis result, and the SLB node is proposed visit, request content;
In step 320, the SLB node confirms whether have this locality that service is provided to the URL of content requests under in conjunction with the restriction of resource allocation policy situation and content statistics situation after receiving content requests.That is, the surplus resources that provides for this client in and if only if the local resource allocation strategy can satisfy user's request, and the content of user's request be when this node can obtain to serve, and SLB accepts the user content request.
In step 322,, determine appropriate C ache according to local resource allocation strategy and local resource information if SLB confirms to accept the user content request.SLB directly is transmitted to the user content request corresponding C ache equipment.
In step 324, Cache equipment is after receiving content requests, and request responds to user content, and content service is provided.Cache equipment also can be checked resource allocation policy when receiving content requests.Check and comprise whether with the requirement of local resource allocation strategy conform to, whether can exceed local resource if checking the consumption of content requests resource requirement, to prevent the allocation strategy conflict, be final decision with this locality.
In step 326, if determine not accept the user content request at step 320SLB, SLB can select secondary node from its matching result to content requests, and it is redirected according to the SLB address of this node application layer to be made in user's request, and the guiding user finishes visit.As to the visit of secondary node failure, the redirected meeting of SLB provides the content source address as final reference address, thereby the guiding user is to the content source request and finish visit.
In an application examples of content routing method of the present invention, the resource allocation policy of setting the GSLB place is: preferentially select the low node of CPU usage; If the difference of each node cpu utilization rate is (for example in 5%～10%) within the specific limits, preferentially select the big node of available bandwidth; If each node bandwidth usage variance when (for example in 5%～10%), is preferentially selected the big node of free memory within the specific limits.5 nodes are arranged in the supposing the system, to obtaining the resource information table after the node resource information gathering arrangement:
| Node | Memory capacity | Memory capacity has been used percentage | CPU usage | The outlet total bandwidth | The bandwidth utilization rate |
| 1 | 5 | 30 | 30 | 2000 | 40 |
| 2 | 6 | 35 | 40 | 1000 | 70 |
| 3 | 3 | 20 | 70 | 1000 | 40 |
| 4 | 5 | 80 | 25 | 2000 | 50 |
| 5 | 10 | 15 | 50 | 2000 | 60 |
Table 1
If there is a user need visit CDN, its visit will be directed to GSLB, and GSLB can return following node listing after screening according to above-mentioned resource allocation policy: 1,4,5,2,3.GSLB is preferably the user like this provides node 1 to be access node, and utilizes DNS mode or application layer routing mode that user capture is guided to this node.
Fig. 4 is the structure chart of an embodiment of load-balancing device of the present invention.As shown in Figure 4, this load-balancing device comprises information acquisition module 41, node selection module 42 and request forwarding module 43.Wherein, the information acquisition module is used to obtain resource information; Node is selected module 42, is used to receive route requests, the resource information of obtaining according to information acquisition module 41, selects node device according to resource allocation policy.For GSLB, the route requests of reception is the domain name mapping request, and for server load balancing, the route requests of reception is a content requests.Request forwarding module 43 is used to receive route requests and the node device of selecting module 42 from node, and this route requests is transmitted to this node device.For GSLB, request forwarding module 43 will return the domain name mapping response, comprising the SLB information of selecting.For server load balancing, request forwarding module 43 is forwarded to content requests the Cache node of selection.
Fig. 5 is the structure chart of another embodiment of load-balancing device of the present invention.As shown in Figure 5, this load-balancing device comprises information acquisition module 41, node selection module 52, request forwarding module 43 and allocation strategy receiver module 54.Information acquisition module 41 and request forwarding module 43 are referring to description corresponding among Fig. 4, for for purpose of brevity, this no longer auspicious stating.Wherein, allocation strategy receiver module 54 is used to receive resource allocation policy, resource allocation policy is sent to node select module 52.For GSLB, receive global resource allocation strategy from asset management device, for server load balancing, receive local resource allocation strategy from asset management device.Node is selected module 52, is used to receive route requests, and the resource information of obtaining according to information acquisition module 41, the resource allocation policy that receives according to allocation strategy acquisition module 54 are selected node device.
Fig. 6 is the structure chart of an embodiment of asset management device of the present invention.As shown in Figure 6, this asset management device comprises resource information acquisition module 61 and resource information distribution module 62.Wherein, resource information acquisition module 61 is used for obtaining resource information from GSLB, server load balancing and cache server; Resource information distribution module 62, the resource information that is used for obtaining according to resource information acquisition module 61 generates global resource information and local resource information, give GSLB with the global resource distribution of information, give server load balancing the local resource distribution of information.
Fig. 7 is the structure chart of another embodiment of asset management device of the present invention.As shown in Figure 7, this asset management device is except comprising resource information acquisition module 61 and resource information distribution module 62, also comprise allocation strategy distribution module 73, be used for, to server load balancing distribution local resource allocation strategy to GSLB distributed resources allocation strategy.
Content routing method provided by the invention and equipment, collect resource information by asset management device, and be distributed to load-balancing device, and select appropriate nodes equipment by load-balancing device according to resource information of receiving and predetermined resource allocation policy, improved systematic function and efficient.Content routing method in the content distributing network of the present invention and equipment are coordinated new demand and old technology and are realized, protect old investment, give old system higher performance.On the one hand, therefore the abstract meticulous scheduling that has realized content route and professional ability distribution of resource to CDN realizes in the CDN network after having increased the resource abstract concept that the content route must adapt to the resource abstracting power.On the other hand, DNS mode and application layer are redirected the content routing mode of mode by most CDN network using, and new content routing mode need be based upon on the aforesaid way, merges the abstract advantage of resource.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.
Claims (10)
1. the content routing method in the content distributing network is characterized in that, comprising:
GSLB GSLB receives the domain name mapping request from local dns, according to from the resource information of asset management device, select the balanced SLB of service service according to resource allocation policy;
Described SLB is returned browser by local dns, and described browser sends content requests to described SLB;
After described SLB receives described content requests,, described content requests is transmitted to described cache server according to from the local resource information of described asset management device, according to local resource allocation policy selection cache server.
2. content routing method according to claim 1 is characterized in that, also comprises:
Asset management device obtains resource information from described GSLB, SLB and cache server, and the resource information of collecting is handled, and gives GSLB with the global resource distribution of information, and local resource information is sent to SLB.
3. content routing method according to claim 1 and 2 is characterized in that, also comprises:
Described asset management device is distributed described resource allocation policy to described GSLB;
Described asset management device is distributed described local resource allocation strategy to described SLB.
4. route content and method according to claim 1 is characterized in that, described GSLB selects SLB to comprise:
GSLB carries out property judgement nearby to the domain name analysis request, according to the SLB of resource information and the suitable user capture of resource allocation policy selection.
5. content routing method according to claim 1 is characterized in that, described SLB comprises according to the step of local resource allocation policy selection cache server:
SLB confirms whether have this locality that service is provided to content requests under in conjunction with the restriction of local resource allocation strategy and content statistics situation;
If provide service, then according to local resource information and local resource allocation policy selection cache server by this locality.
6. content routing method according to claim 3 is characterized in that, also comprises:
Described SLB transmits part relevant with described cache server in the described local resource allocation strategy to cache server;
After described cache server is received described content requests, described content requests is checked, checked by the back and provide content service in response to described content requests according to described local resource allocation strategy.
7. a load-balancing device is characterized in that, comprising:
The information acquisition module is used to obtain resource information;
Node is selected module, is used to receive route requests, the resource information of obtaining according to described information acquisition module, selects node device according to resource allocation policy;
The request forwarding module is used to receive route requests and the node device of selecting module from described node, and described route requests is transmitted to described node device.
8. load-balancing device according to claim 7 is characterized in that, also comprises:
The allocation strategy receiver module is used to receive resource allocation policy, described resource allocation policy is sent to described node select module;
Described node is selected module, is used to receive route requests, and the resource information of obtaining according to described information acquisition module, the resource allocation policy that receives according to described allocation strategy acquisition module are selected node device.
9. an asset management device is characterized in that, comprising:
The resource information acquisition module is used for obtaining resource information from GSLB, server load balancing and cache server;
The resource information distribution module, the resource information that is used for obtaining according to described resource information acquisition module generates global resource information and local resource information, give described GSLB with described global resource distribution of information, give described server load balancing described local resource distribution of information.
10. asset management device according to claim 9 is characterized in that, also comprises:
The allocation strategy distribution module is used for to described GSLB distributed resources allocation strategy, to described server load balancing distribution local resource allocation strategy.
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