CN103731506B - A kind of content injection method, the first business service node and content distributing network - Google Patents

Abstract

Embodiments of the present invention provide a content injection method, a first business service node, and a content distribution network, which relate to the field of communications, and can alleviate storage pressure on content library nodes and improve content storage efficiency. Including: receiving a content injection instruction, the content injection instruction including the address of the first content to be injected; obtaining the first content according to the address of the first content; storing the first content locally, so as to request acquisition The terminal device of the first content acquires the first content locally. The content injection method, the first service service node and the content distribution network provided by the embodiment of the present invention are used for content injection and distribution.

Description

A content injection method, a first service service node and a content distribution network

technical field

The present invention relates to the communication field, in particular to a content injection method, a first service service node and a content distribution network.

Background technique

CDN (Content Delivery Network) is an intelligent virtual network based on the deployment of node servers at key locations in the network to form an existing network. Through the analysis of network traffic, node health, node load, node performance and other information, CDN dynamically deploys content distribution on the network, and intelligently schedules terminal business access data. CDN deployment can effectively alleviate traffic congestion at key nodes in the network, avoid bottleneck nodes and links that may affect data transmission speed and stability, and reduce backbone network traffic.

The existing CDN can be shown in Figure 1, CDN10 includes: content library node 101, content caching node 102, business service node 103, CMS (Content Management System, content management system) 104, SP (ServiceProvider, service provider) 105. CP (Content Provider, content provider) 106, GSLB (Global Server Load Balance, global load balancing) module 107, SLB (Server Load Balance, load balancing) module 108, and so on. In CDN10, each module is hierarchically managed, and the content library node 101 manages each content cache node 102, and each content cache node 102 manages the corresponding business service node 103 within its management scope, and the content library node 101 can communicate with CMS104, SP105, The CP106 communicates with any one of the GSLB modules 107, and the content library node 101 performs content injection according to the injection instruction sent by any one of the CP106, SP105 and CMS104. When the terminal device needs to obtain content, it receives the GSLB module 107 and the SLB The business service node 103 of the content request information dispatched by the module 108 needs to request content from the content cache node 102 that manages the business service node 103, and then the content cache node 102 requests the content from the content library node 101, and the content library node 101 provides the content , and send it to the business service node 103 through the content caching node 102 again, and the business service node 103 sends it to the terminal device.

Because in the existing CDN network, all content injection is completed by the content library node, the storage pressure of the content library node is high, resulting in low content storage efficiency.

Contents of the invention

Embodiments of the present invention provide a content injection method, a first service service node, and a content distribution network, which can alleviate storage pressure on content library nodes and improve content storage efficiency.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

On the one hand, a content injection method is provided for a first business service node, including:

receiving a content injection instruction, the content injection instruction including an address of the first content to be injected;

acquiring the first content according to the address of the first content;

Store the first content locally, so that a terminal device that requests to acquire the first content acquires the first content locally.

In one aspect, a first business service node is provided, including:

a first receiving unit, configured to receive a content injection instruction, where the content injection instruction includes an address of the first content to be injected;

a first acquiring unit, configured to acquire the first content according to the address of the first content;

The first storage unit is configured to store the first content locally, so that a terminal device that requests to acquire the first content acquires the first content locally.

In one aspect, a content distribution network is provided, including:

Any of the first business service nodes mentioned above;

Content library node;

content caching node;

GSLB module;

SLB module.

An embodiment of the present invention provides a content injection method, a first business service node, and a content distribution network, including: receiving a content injection instruction, the content injection instruction including the address of the first content to be injected; acquiring the first content at an address; storing the first content locally, so that a terminal device that requests to acquire the first content acquires the first content locally. In this way, since the injection of the first content is implemented on the business service node, the terminal device requesting to obtain the first content can obtain the first content from the first service node, effectively sharing the content database The storage content of the node, thereby alleviating the storage pressure of the content library node and improving the content storage efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic diagram of a CDN structure provided by the prior art;

FIG. 2 is a schematic diagram of a CDN structure provided by an embodiment of the present invention;

FIG. 3 is a flow chart of a content injection method provided by an embodiment of the present invention;

FIG. 4 is a flowchart of another content injection method provided by an embodiment of the present invention;

FIG. 5 is a flowchart of a second content acquisition method provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a first service service node provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another first business service node provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another first service service node provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The CDN provided by the embodiment of the present invention may be shown in FIG. 2 . The CDN20 includes: a content library node 201, a content cache node 202, a business service node 203, a CMS (Content Management System, content management system) 204, and an SP (Service Provider, service provider). Provider) 205, CP (Content Provider, content provider) 206, GSLB (Global Server Load Balance, global load balancing) module 207, SLB (Server Load Balance, load balancing) module 208, etc. In the CDN20, each module is managed hierarchically, and the content library node 201 manages each content cache node 202, and each content cache node 202 manages the corresponding business service node 203 within its management scope, and the content library node 201 can communicate with CMS204, SP205, The CP206 communicates with any one of the GSLB modules 207, and the content library node 201 injects content according to the injection instruction sent by any one of the CP206, SP205 and CMS204. When the terminal device needs to obtain content, it receives the content request information. The service node 203 can request content from the content cache node 202 that manages the business service node 203, and then the content cache node 202 requests content from the content library node 201, and the content library node 201 provides the content, and passes through the content cache node again 202 is sent to the business service node 203, and the business service node 203 sends it to the terminal device. Further, as shown in FIG. 2 , any business service node 203 may communicate with any one of CMS 204 , SP 205 , CP 206 , GSLB module 207 and SLB module 208 .

Since the CDN may include multiple service service nodes, the embodiment of the present invention takes the first service service node as an example, and the first service service node may be any service service node in the CDN.

An embodiment of the present invention provides a content injection method, as shown in FIG. 3, used for the first business service node, including:

Step 301. Receive a content injection instruction, where the content injection instruction includes the address of the first content to be injected.

The content injection instruction may be sent to the first service service node by any one of CP, SP and CMS. The first content to be injected may be video, application and so on. The address of the first content is usually a URL (Resource Locator, Uniform Uniform Resource Locator) of the first content.

Step 302. Acquire the first content according to the address of the first content.

Step 303: Store the first content locally, so that the terminal device that requests to acquire the first content acquires the first content locally.

In this way, since the injection of the first content is implemented on the business service node, the terminal device requesting to obtain the first content can obtain the first content from the first service node, effectively sharing the content database The storage content of the node, thereby alleviating the storage pressure of the content library node and improving the content storage efficiency.

Further, after the first business service node stores the content to be injected in step 303, the first business service node may also generate the identifier of the first content and the storage information of the first content according to the first content, the The first content storage information indicates whether the first service node has content storage; the first content storage information is sent to the SLB module in charge of the first business service node; and the identification of the first content is stored locally.

In particular, when there is a terminal device that needs to acquire content, the method further includes:

receiving the content request information forwarded by the SLB module in charge of the first business service node, the content request information includes the identifier of the second content requested by the terminal device and the address of the terminal device, and the content request information is provided by the According to the content request information sent by the terminal device, the GSLB module determines that the area where the terminal device is located is within the jurisdiction of the SLB, and forwards it to the SLB module; obtains the identifier of the second content according to the content request information The corresponding second content: sending the second content to the terminal device corresponding to the address of the terminal device.

Specifically, the acquiring the second content corresponding to the second content identifier according to the content request information includes: judging whether the second content corresponding to the second content identifier is stored locally; The second content corresponding to the content identifier is obtained locally; when the second content corresponding to the second content identifier is not stored locally, the content request information is sent to the second business service node, so that The node that stores the second content corresponding to the second content identifier in the second business service node sends the second content to the first business service node, and the second business service node is related to the The first service node is a business service node managed by the same SLB module and storing content.

It should be noted that, in the CDN provided by the embodiment of the present invention, the first business service node can obtain the information of content storage in other business service nodes through the broadcast message of other business service nodes under the jurisdiction of the same SLB module, or through the broadcast The message is used to inform other business service nodes under the jurisdiction of the same SLB module that they store content. For example, after step 303, the first business service node may broadcast the first content storage information, the first content storage information indicates whether the first business service node has content storage, in this embodiment , since the first business service node has stored the first content, the content storage information indicates that the first business service node has content storage. At the same time, the first business service node may also receive the second content storage information broadcast by other business service nodes managed by the same SLB module as the first business service node, and the second content storage information indicates that the other business service nodes Whether there is content storage; determine a business service node with content storage as the second business service node according to the second content storage information. In this way, the first business service node can know all business service nodes that store content within the management range of the load balancing SLB module that governs the first business service node.

Specifically, the embodiment of the present invention provides a content injection method, assuming that the first business service node and the second business service node are nodes governed by the same SLB module, and the SLB modules governing the first business service node and the second business service node is the first SLB module. As shown in Figure 4, including:

Step 401, the first business service node receives a content injection instruction, and the content injection instruction includes the address of the first content to be injected.

The content injection instruction may be sent to the first service service node by any one of CP, SP and CMS. The first content to be injected may be video, application and so on. The address of the first content is usually the URL of the first content.

Step 402, the first business service node acquires the first content according to the address of the first content.

When the address of the first content is the URL of the first content, the first business service node can obtain the first content from the corresponding server according to the URL, and the first content includes content source files and metadata wait.

Step 403, the first business service node stores the first content locally.

The storage process is the process of injecting the first content into the first content.

Step 404, the first service service node generates the identifier of the first content and the storage information of the first content according to the first content.

The first content identifier is used to uniquely identify the first content in the CDN. The generation rule of the first content identifier can refer to the generation rule of the content identifier in the content library node. For example, the first content identifier can be It consists of a preset number of character strings, where there are x characters at specific positions in the character string indicating that the first content is stored in the business service node, and there are y characters at specific positions indicating the business of the first content storage Service node identification, there are z characters in specific positions indicating the area where the first content is stored, wherein the area where the first content is stored refers to the geographical area to which the business service node of the first content store belongs, such as Nanjing, Beijing, etc.; the first content storage information indicates whether the first service node has content storage, for example, the first content storage information can use specific characters to indicate whether the first service node has content storage, such as characters 0 indicates that the first service node has no content storage, and character 1 indicates that the first service node has no content storage. In this embodiment, since the first service node stores at least the first content, the first content storage information indicates that the first service node has content storage.

In particular, if the content injection instruction received by the first service service node in step 401 is sent by a CP or SP, the content injection instruction may also include information about the CP or SP. When generating the first content identifier, the first service The service node can also set the character at a specific position to indicate the priority of the first content according to the information sent by the CP or SP, for example, the priority of Sina is higher than that of Sohu, and the content injection instruction is sent by Sina, then The characters at a specific position in the first content identifier are set to indicate the priority corresponding to Sina.

Step 405, the first business service node sends the first content storage information to the first SLB module.

Since all business service nodes governed by the first SLB will send content storage information to the first SLB module, the first SLB module records whether all business service nodes governed by the first SLB have content storage.

Step 406, the first service service node stores the identifier of the first content locally.

Step 407, the first service service node broadcasts the first content storage information.

It should be noted that, since the content on the first service node may change with time, the first service service node may broadcast the first content storage information periodically. If the first content storage information is broadcast periodically, Then the broadcasted first content storage information indicates that there are two cases of content storage and no content storage. It is also possible to generate new first content storage information for broadcast after each content injection. If the content is generated after each content injection When the new first content storage information is broadcast, the result value indicated by the broadcast first content storage information may contain content storage. So far, the entire process of injecting the first content on the first service node is completed.

Step 408, the terminal device sends content request information to the GSLB module.

The content request information includes the identifier of the second content requested by the terminal device and the address of the terminal device. The address of the terminal device may be an IP (Internet Protocol, Internet Protocol) address of the terminal device. The present invention assumes that the content requested by the terminal device It is the second content, and the second content may be the same as or different from the above-mentioned first content.

Step 409, the GSLB module determines the area where the terminal device is located according to the content request information.

The GSLB module can determine the area where the terminal device is located according to the address of the terminal device in the content request information. For example, the address of the terminal device is the IP address of the terminal device. According to the IP address, it can be determined that the terminal device is located in Nanjing.

Step 410, the GSLB module dispatches the content request information to the SLB module in charge of the area where the terminal device is located.

In this embodiment of the present invention, it is assumed that the SLB module in charge of the area where the terminal device is located is the first SLB module.

Step 411, the first SLB dispatches the content request information to the first service service node.

According to step 405, it can be known in the first SLB module whether all the business service nodes under the jurisdiction of the first SLB have content storage, and then the first SLB can determine the corresponding business service nodes according to the preset allocation principle. For example, if the preset Assuming that the distribution principle is the principle of proximity, the first SLB selects the business service node that is closest to the terminal device among the business service nodes that store content as the business service node that needs to be scheduled. If the preset distribution principle is the content priority principle, Then the first SLB selects a business service node with a relatively small load among the business service nodes storing content as the business service node that needs to be scheduled. In this embodiment of the present invention, it is assumed that the business service node that needs to be scheduled is the first business service node.

Step 412, the first business service node acquires the second content.

Specifically, as shown in FIG. 5, obtaining the second content by the first business service node includes:

4121. The first business service node determines whether the second content corresponding to the second content identifier is locally stored. If yes, go to step 4122; if not, go to step 4123.

According to steps 404 and 406, it can be seen that the first business service node generates and saves the corresponding content ID after each content injection, so the first business service node can query whether there is a local storage that is identical to the second content ID If it exists, it means that the second content corresponding to the identifier of the second content is locally stored, and if it does not exist, it means that the second content corresponding to the identifier of the second content is not stored locally.

4122. The first business service node acquires the second content on the first business service node.

4123. The first business service node determines the second business service node. Execute step 4124.

It can be known from step 407 that each business service node in the CDN broadcasts its own content storage information, and correspondingly, other business service nodes within the scope managed by the first SLB will also broadcast the second content storage information, and the broadcast action It may be performed periodically or after each content injection. The first business service node receives the second content storage information broadcast by other business service nodes under the jurisdiction of the same SLB module as the first business service node, so The second content storage information indicates whether the other business service nodes have content storage; then according to the second content storage information, determine the business service node with content storage as the second business service node, and the second service node It can be one or more, which is not limited in the present invention.

4124. The first business service node sends the content request information to the second business service node. Execute step 4125.

It should be noted that, in the embodiment of the present invention, the business service nodes under the jurisdiction of the same SLB module perform information communication in a P2P (Peer to Peer, peer-to-peer network) manner, and the specific manner may refer to the prior art. Then in this step, the first business service node sends the content request information to the second business service node through P2P.

4125. The node in the second business service node that stores the second content corresponding to the identifier of the second content sends the second content to the first business service node.

The second business service node receiving the content request will judge whether the second business service node stores the second content corresponding to the second content identifier, and if so, send the second content directly to the first business service node. If the content is not stored, it will not be processed.

It should be noted that if the second content ID is not stored in any of the second business service nodes, the first business service node may notify the GSLB to reprocess, or request the content from the content caching node, which is not covered by the present invention. Do limited.

In this embodiment of the present invention, assuming that there is an identifier storing the second content in the second business service node, the business service node sends the second content to the first business service node.

Step 413, the first service service node sends the second content to the terminal device corresponding to the address of the terminal device.

It should be noted that, in the embodiment of the present invention, business can be injected from both the business service node and the content library node, and there are only the two injection methods, then if there is no second content in the second business service node, The first business service node may request content from the content cache node that manages the business service node, so as to obtain content from the content library node; the first business service node may also first request content from the content cache node that manages the business service node, so that To obtain the content from the content library node, if the content library node does not have the second content, then perform steps 4121 to 4125; the first business service node can also determine whether the second content is injected from the business service node or the content Injected by the library node, and then adopt the corresponding content acquisition method, the first business service node can determine the injection point of the second content according to the specific number of characters in the specific position of the identification of the second content. For example, In step 404, when the first business service node generates the identifier of the first content, the first content identifier is composed of a preset number of character strings, and there are x characters at specific positions in the character string indicating that the first A content is stored in a business service node, there are y characters at specific positions indicating the business service node identifier stored in the first content, there are z characters at specific positions indicating the area where the first content is stored, and each business service node adopts If there is a unified content generation rule, the first business service node can check the characters at the x specific positions to determine whether the second content is injected from the business service node.

The sequence of the steps of the content injection method provided by the embodiment of the present invention can be appropriately adjusted, and the steps can also be increased or decreased according to the situation. Any person familiar with the technical field can easily think of changes within the technical scope disclosed in the present invention. Methods should all be covered within the protection scope of the present invention, and thus will not be repeated here.

In the content injection method provided by the embodiment of the present invention, since the injection of the first content is implemented on the business service node, the terminal device that requests to obtain the first content can obtain the first content from the first service node, Effectively share the storage content of content library nodes, thereby alleviating the storage pressure of content library nodes and improving content storage efficiency.

An embodiment of the present invention provides a first business service node 60, as shown in FIG. 6, including:

The first receiving unit 601 is configured to receive a content injection instruction, where the content injection instruction includes an address of the first content to be injected.

The first obtaining unit 602 is configured to obtain the first content according to the address of the first content.

The first storage unit 603 is configured to store the first content locally, so that a terminal device that requests to acquire the first content acquires the first content locally.

In this way, since the injection of the first content is implemented on the business service node, the terminal device requesting to obtain the first content can obtain the first content from the first service node, effectively sharing the content database The storage content of the node, thereby alleviating the storage pressure of the content library node and improving the content storage efficiency.

Further, as shown in FIG. 7, the first business service node 60 further includes:

The generating unit 604 is configured to generate an identifier of the first content and first content storage information according to the first content, where the first content storage information indicates whether the first service node has content storage.

The first sending unit 605 is configured to send the first content storage information to the load balancing SLB module in charge of the first business service node.

The second storage unit 606 is configured to locally store the identifier of the first content.

The second receiving unit 607 is configured to receive the content request information forwarded by the SLB module in charge of the first business service node, where the content request information includes the identifier of the second content requested by the terminal device and the address of the terminal device, so The content request information is forwarded to the SLB module after the GSLB module determines that the area where the terminal device is located is within the jurisdiction of the SLB according to the content request information sent by the terminal device.

The second acquiring unit 608 is configured to acquire the second content corresponding to the identifier of the second content according to the content request information.

The second sending unit 609 is configured to send the second content to the terminal device corresponding to the address of the terminal device.

Wherein, the second obtaining unit 608 is specifically configured to:

Determine whether the second content corresponding to the identifier of the second content is stored locally; if the second content corresponding to the identifier of the second content is stored locally, obtain the second content locally; if the second content is not stored locally The second content corresponding to the content identifier sends the content request information to the second business service node, so that the node storing the second content corresponding to the second content identifier in the second business service node sends The first business service node sends the second content, and the second business service node is a business service node managed by the same SLB module as the first service node and stores content.

Further, as shown in FIG. 8, the first business service node 60 further includes:

The third receiving unit 610 is configured to receive the second content storage information broadcast by other business service nodes managed by the same SLB module as the first business service node, the second content storage information indicating whether the other business service nodes There is content storage.

The determining unit 611 is configured to determine, according to the second content storage information, a business service node with content storage as the second business service node.

The embodiment of the present invention also provides a content distribution network comprising: the first service service node described in any of the above embodiments of the present invention; a content library node; a content cache node; a GSLB module; and an SLB module. Wherein, the first business service node is configured to receive a content injection instruction, the content injection instruction includes the address of the first content to be injected; acquire the first content according to the address of the first content; store the first content locally The first content is described, so that the terminal device that requests to obtain the first content obtains the first content locally. The content distribution network may be shown in FIG. 2 , and the comparison in the present invention will not be repeated here.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may be physically included separately, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (11)

1. A content injection method, characterized in that it is used for a first business service node, and the first business service node is connected with a service provider SP, a content provider CP and a content management system CMS, comprising: receiving a content injection instruction sent by a service provider SP, a content provider CP or a content management system CMS, where the content injection instruction includes the address of the first content to be injected; acquiring the first content according to the address of the first content; storing said first content locally; generating first content storage information according to the first content, the first content storage information indicating whether the first business service node has content storage; Sending the first content storage information to the load balancing SLB module that governs the first business service node and other business service nodes governed by the same SLB module, so that the terminal device that requests to obtain the first content can obtain the first content locally Describe the first content. 2. The method according to claim 1, characterized in that, after locally storing the content to be injected, the method further comprises: generating an identifier of the first content according to the first content; The identifier of the first content is stored locally. 3. The method according to claim 2, wherein after storing the first content locally, the method further comprises: receiving the content request information forwarded by the SLB module in charge of the first business service node, the content request information includes the identifier of the second content requested by the terminal device and the address of the terminal device, and the content request information is provided by the global payload The balance GSLB module forwards to the SLB module after determining that the area where the terminal device is located is within the jurisdiction of the SLB module according to the content request information sent by the terminal device; Acquiring the second content corresponding to the identifier of the second content according to the content request information; Send the second content to a terminal device corresponding to the address of the terminal device. 4. The method according to claim 3, wherein said obtaining the second content corresponding to the identifier of the second content according to the content request information comprises: judging whether the second content corresponding to the identifier of the second content is locally stored; When the second content corresponding to the identifier of the second content is stored locally, acquire the second content locally; When the second content corresponding to the identifier of the second content is not stored locally, send the content request information to the second business service node, so that the identifier corresponding to the second content is stored in the second business service node The node of the second content of the first business service node sends the second content to the first business service node. The second business service node is a business service that is managed by the same SLB module as the first business service node and stores content. node. 5. The method according to claim 4, characterized in that, before sending the content request information to the second service service node, the method further comprises: receiving second content storage information broadcast by other business service nodes governed by the same SLB module as the first business service node, where the second content storage information indicates whether the other business service nodes have content storage; A business service node with content storage is determined as the second business service node according to the second content storage information. 6. A first business service node, characterized in that the first business service node is connected to a service provider SP, a content provider CP and a content management system CMS, including: The first receiving unit is configured to receive a content injection instruction sent by a service provider SP, a content provider CP or a content management system CMS, where the content injection instruction includes the address of the first content to be injected; a first acquiring unit, configured to acquire the first content according to the address of the first content; a first storage unit, configured to store the first content locally; A generating unit, configured to generate first content storage information according to the first content, where the first content storage information indicates whether the first business service node has content storage; The first sending unit is configured to send the first content storage information to the load balancing SLB module that governs the first business service node and other business service nodes governed by the same SLB module, so as to request to obtain the first content The terminal device acquires the first content locally. 7. The first business service node according to claim 6, characterized in that, the first business service node further comprises: a generating unit, further configured to generate an identifier of the first content according to the first content; The second storage unit is configured to locally store the identifier of the first content. 8. The first business service node according to claim 7, wherein the first business service node further comprises: The second receiving unit is configured to receive the content request information forwarded by the SLB module in charge of the first business service node, the content request information includes the identifier of the second content requested by the terminal device and the address of the terminal device, the said The content request information is forwarded to the SLB module after the global load balancing GSLB module determines that the area where the terminal device is located is within the jurisdiction of the SLB module according to the content request information sent by the terminal device; a second obtaining unit, configured to obtain the second content corresponding to the second content identifier according to the content request information; The second sending unit is configured to send the second content to the terminal device corresponding to the address of the terminal device. 9. The first business service node according to claim 8, wherein the second obtaining unit is specifically configured to: judging whether the second content corresponding to the identifier of the second content is locally stored; When the second content corresponding to the identifier of the second content is stored locally, acquire the second content locally; When the second content corresponding to the identifier of the second content is not stored locally, send the content request information to the second business service node, so that the identifier corresponding to the second content is stored in the second business service node The node of the second content of the first business service node sends the second content to the first business service node. The second business service node is a business service that is managed by the same SLB module as the first business service node and stores content. node. 10. The first business service node according to claim 9, wherein the first business service node further comprises: The third receiving unit is configured to receive the second content storage information broadcast by other business service nodes managed by the same SLB module as the first business service node, and the second content storage information indicates whether the other business service nodes have content storage; A determining unit, configured to determine a business service node with content storage as the second business service node according to the second content storage information. 11. A content distribution network, characterized in that it comprises: The first business service node described in any one of claims 6 to 10; Content library node; content caching node; GSLB module; SLB module.