CN103532817A - CDN (content delivery network) dynamic acceleration system and method - Google Patents
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Abstract
The invention relates to a CDN (content delivery network) dynamic acceleration system and method. The CDN dynamic acceleration system comprises a source site and a CDN node pool, wherein a virtual acceleration network is constructed between the source site and the CDN node pool; an optimum CDN node in the CDN node pool is connected with the source site via the virtual acceleration network; the virtual acceleration network comprises a plurality of acceleration nodes; the acceleration nodes establish tunnel junction by a VPN (virtual private network); the CDN node in the CDN node pool can be accessed into an acceleration node which is nearest to the CDN node as an access node; the virtual acceleration network selects the acceleration node nearest to the source site according to the position on which the CDN node needs to be connected with the source site as an outbound node to realize connection between the CDN node and the source site; after the outbound node receives the reply of the source site, the reply of the source site is sent to the CDN node via the access node. According to the CDN dynamic acceleration system disclosed by the invention, the dynamic content can be accelerated, the data transmission efficiency between the CDN node and the source site can be improved and guaranteed, and the CDN dynamic acceleration system has the advantages of wide applicable range, safety and reliability.
Description
Technical field
The present invention relates to a kind of system and method, especially a kind of CDN is the system and method for acceleration dynamically, belongs to the technical field of CDN.
Background technology
The full name of CDN is Content Delivery Network, i.e. content distributing network.Its basic ideas are by placing node server everywhere at network, with one deck intelligent virtual network on existing Internet basic forming by node server, thereby avoid speed bottle-neck possible on the Internet and unsettled network link, make content delivery sooner, more stable.
CDN system can be in real time leads user's request on the nearest service node of user by intelligent DNS again according to the connection of network traffics and each node, load state and to integrated informations such as user's distance and response times, object is to make user can obtain required content nearby, solve the situation of Internet network congestion, improve the response speed of user's access websites, as shown in Figure 1.
In traditional CDN system, user is resolved on nearest CDN service node by intelligent DNS, and user sends request the node to CDN, and CDN service node is first searched the reply that whether has this request in buffer memory, if had, rapidly this reply is fed back to user; If not this reply in buffer memory, automatically request is transmitted to Source Site, and the reply of Source Site is sent it back to user, and also this reply is kept in CDN node simultaneously, during like this for the same request of subsequent user, just can directly from CDN buffer memory, extract reply content.
Traditional CDN structure can improve the access speed of static content very effectively, but there is fatal defect for dynamic content, because for dynamic content, the caching function of CDN node does not have any effect, user forwards by CDN node for obtaining just of dynamic content, be all finally to obtain from Source Site, so CDN system does not almost have acceleration to dynamic content.As shown in Figure 2, in traditional C DN system, user only equals user to the time T 1 of CDN node to static content acquisition time, and is the time T 1 of user to CDN node to the acquisition time of dynamic content, also should add that CDN node is to the time T 2 of Source Site simultaneously.
This defect for traditional C DN system, its main cause is: user must obtain from Source Site for the request of dynamic content, CDN node has only played the effect forwarding, although can be user by intelligent DNS in CDN system, select nearest CDN node, thereby shortened to greatest extent the time of T1; But for dynamic content, CDN node is uncontrollable to the time T 2 of Source Site, so T2 time value has just determined the access efficiency of dynamic content.In traditional CDN system, lack a kind of like this effective guarantee CDN node to the method for the network speed between Source Site.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the system and method that provides a kind of CDN dynamically to accelerate, it can realize the acceleration of dynamic content, improves, ensures the data transmission efficiency between CDN node and Source Site, and wide accommodation is safe and reliable.
According to technical scheme provided by the invention, the system that described CDN dynamically accelerates, comprises Source Site and CDN node pool; Between described Source Site and CDN node pool, be built with virtual accelerating network, the CDN node in CDN node pool is connected with Source Site by virtual accelerating network; In described virtual accelerating network, comprise some acceleration nodes, between described acceleration node, by VPN, set up tunnel and connect;
CDN node in CDN node pool can access the nearest acceleration node of the described CDN nodal distance of distance as access node, virtual accelerating network need to connect the nearest acceleration node in Source Site described in the position chosen distance of Source Site as going out tiny node according to CDN node, to realize being connected between CDN node and Source Site; Above-mentionedly go out tiny node and receive after the reply of Source Site, the reply of described Source Site is sent to CDN node by access node by the reply of Source Site.
Described CDN node pool is connected with intelligent DNS, obtains the IP address of required CDN node in CDN node pool by intelligent DNS.
In described virtual accelerating network, accelerate node and according to dynamic routing protocol, carry out the selection in path, described dynamic routing protocol comprises OSPF or RIP standard agreement.
The method that CDN dynamically accelerates, described dynamic accelerating method comprises the steps:
A, between Source Site and CDN node pool, build virtual accelerating network, CDN node in CDN node pool is connected with Source Site by virtual accelerating network, in described virtual accelerating network, comprise some acceleration nodes, between described acceleration node, by VPN, set up tunnel and connect;
B, by intelligent DNS, be connected with CDN node pool, and obtain the IP address of required CDN node, and using the described CDN node that obtains IP address as service node;
C, to service node, send access originator site requests, service node is sent in virtual accelerating network the nearest acceleration node of service node described in distance by the Source Site of request by tunnel, usings as access node;
D, virtual accelerating network arrive access originator site requests fast the nearest acceleration node of distance sources website from access node passes through optimal route selection, using as going out tiny node;
E, access originator site requests reach after tiny node, utilize nat technology that access originator site requests is sent to Source Site;
F, Source Site are received after request, reply are sent to out to tiny node;
G, go out tiny node the reply of Source Site is sent to access node;
H, access node are sent to service node by the reply of Source Site, and service node sends to user by the reply of Source Site by intelligent DNS.
In described step b, service node is the nearest CDN node of the intelligent DNS of distance.
In described steps d, accelerate node and according to dynamic routing protocol, carry out the selection in path in described virtual accelerating network, described dynamic routing protocol comprises OSPF or RIP standard agreement.
Advantage of the present invention: by build virtual accelerating network between Source Site and CDN node pool, in virtual accelerating network, comprise some acceleration nodes, accelerate by vpn tunneling, to connect between node, can realize CDN dynamically accelerates, guarantee the effect of dynamically accelerating, adopt VPN technologies and dynamic routing technology, make full use of internet itself, cost is low.At IP layer, realize and forwarding, forward efficiency is high, irrelevant with application; The support of expansion CDN node to different internet, applications, thus realize the dynamic acceleration demand to other non-HTTP application.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of existing CDN.
Fig. 2 is the explanation schematic diagram of existing CDN static content acquisition time.
Fig. 3 is the explanation schematic diagram of existing CDN dynamic content acquisition time.
Fig. 4 is structural representation of the present invention.
Fig. 5 is the concrete structural representation of implementing of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 4: in order to realize the acceleration to dynamic content in CDN system, improve the data transmission efficiency between CDN node and Source Site, the present invention includes Source Site and CDN node pool; Between described Source Site and CDN node pool, be built with virtual accelerating network, the CDN node in CDN node pool is connected with Source Site by virtual accelerating network; In described virtual accelerating network, comprise some acceleration nodes, between described acceleration node, by VPN, set up tunnel and connect;
CDN node in CDN node pool can access the nearest acceleration node of the described CDN nodal distance of distance as access node, virtual accelerating network need to connect the nearest acceleration node in Source Site described in the position chosen distance of Source Site as going out tiny node according to CDN node, to realize being connected between CDN node and Source Site; Above-mentionedly go out tiny node and receive after the reply of Source Site, the reply of described Source Site is sent to CDN node by access node by the reply of Source Site.
Particularly, in the embodiment of the present invention, virtual accelerating network forms by dispose accelerating node in zones of different, accelerates node and can adopt independently Linux server, accelerates between node by VPN(Virtual Private Network) set up tunnel connection.Accelerate node deployment and should fully take into account each large node city, China the Internet and be advisable (such as Beijing, Shanghai, Guangzhou, Nanjing, Wuhan, Xi'an, Shenyang, Chongqing etc.), take into account service distribution situation simultaneously.CDN node pool consists of some CDN nodes.
In virtual accelerating network, respectively accelerate between node when carrying out Path selection, follow dynamic routing protocol, so that accelerate the function that node has dynamic routing, can realize in the selection of accelerating optimal path between node, guarantee to accelerate arbitrarily the real-time adjustment of the optimal path between node.Accelerate node in described virtual accelerating network and according to dynamic routing protocol, carry out the selection in path, dynamic routing protocol can adopt OSPF(Open Shortest Path First) or RIP(routing information protocol) etc. standard agreement also can be according to the independently developed privately owned dynamic routing protocol of feature of self network
When concrete use, user need to be connected with the CDN node in CDN node pool by intelligent DNS, obtains the IP address of required CDN node in CDN node pool by intelligent DNS.The IP address that intelligence DNS obtains the nearest CDN node of distance users.Described intelligent DNS(Domain Name System) can select existing DNS.Further, in the CDN of CDN node pool interior nodes, receive after the reply of Source Site, described reply can be preserved, can accelerate next user, carry out static access.
The method that CDN dynamically accelerates, described dynamic accelerating method comprises the steps:
A, between Source Site and CDN node pool, build virtual accelerating network, CDN node in CDN node pool is connected with Source Site by virtual accelerating network, in described virtual accelerating network, comprise some acceleration nodes, between described acceleration node, by VPN, set up tunnel and connect;
B, by intelligent DNS, be connected with CDN node pool, and obtain the IP address of required CDN node, and using the described CDN node that obtains IP address as service node;
When user needs access originator website, user's access means is connected with the CDN node in CDN node pool by intelligent DNS, the IP address that intelligence DNS obtains the nearest CDN node of distance users access means, service node is the nearest CDN node of the intelligent DNS of distance.
C, to service node, send access originator site requests, service node is sent in virtual accelerating network the nearest acceleration node of service node described in distance by the Source Site of request by tunnel, usings as access node;
D, virtual accelerating network arrive access originator site requests fast the nearest acceleration node of distance sources website from access node passes through optimal route selection, using as going out tiny node;
E, access originator site requests reach after tiny node, utilize nat technology that access originator site requests is sent to Source Site;
Described nat technology refers to network address translation (NAT, Network Address Translation) belong to access wide area network (WAN) technology, be a kind of switch technology that is legitimate ip address by privately owned (reservation) address spaces, it is widely used in all kinds Internet access way and various types of network.
F, Source Site are received after request, reply are sent to out to tiny node;
G, go out tiny node the reply of Source Site is sent to access node;
H, access node are sent to service node by the reply of Source Site, and service node sends to user by the reply of Source Site by intelligent DNS.
As shown in Figure 5, be the concrete implementation column that the present invention accelerates, described accelerated method comprises the steps:
1), user obtains the IP address of best CDN node 1 by intelligent DNS, described best CDN node 1 refers to the CDN node that distance users access means is nearest;
2), user sends access site (take www.abc.com as example) request to best CDN node 1;
3), CDN node 1 is sent to user request the acceleration node A of virtual acceleration net by tunnel, enter virtual accelerating network; Accelerate node A as access node;
4), virtual acceleration net sent to request fast and accelerated node D by optimal path from accelerating node A, accelerates nearest apart from access originator website of node D;
5), request reaches and accelerates after node D, will leave virtual acceleration net from accelerating node D after entering nat technology, request is sent to Source Site www.abc.com;
6), Source Site receives after request, reply can send to accelerates node D;
7), accelerate node D and receive after the reply of Source Site, by optimal path, send to fast and accelerate node A equally; Be that access request is transferred to the path of accelerating node D from accelerating node A, identical with the path that acceleration node D is transferred to acceleration node A by reply.
8), the reply of Source Site is being sent to CDN node 1 from accelerating node A;
9), finally from CDN node 1, the reply of Source Site is sent to user, thereby complete the process that whole CDN dynamically accelerates.
The present invention by building virtual accelerating network between Source Site and CDN node pool, in virtual accelerating network, comprise some acceleration nodes, accelerate by vpn tunneling, to connect between node, can realize CDN dynamically accelerates, guarantee the effect of dynamically accelerating, adopt VPN technologies and dynamic routing technology, make full use of internet itself, cost is low.At IP layer, realize and forwarding, forward efficiency is high, irrelevant with application; The support of expansion CDN node to different internet, applications, thereby realize other non-HTTP(Hypertext transfer protocol) the dynamic acceleration demand of application.
Claims (6)
1. the system that CDN dynamically accelerates, comprises Source Site and CDN node pool; It is characterized in that: between described Source Site and CDN node pool, be built with virtual accelerating network, the CDN node in CDN node pool is connected with Source Site by virtual accelerating network; In described virtual accelerating network, comprise some acceleration nodes, between described acceleration node, by VPN, set up tunnel and connect;
CDN node in CDN node pool can access the nearest acceleration node of the described CDN nodal distance of distance as access node, virtual accelerating network need to connect the nearest acceleration node in Source Site described in the position chosen distance of Source Site as going out tiny node according to CDN node, to realize being connected between CDN node and Source Site; Above-mentionedly go out tiny node and receive after the reply of Source Site, the reply of described Source Site is sent to CDN node by access node by the reply of Source Site.
2. the system that CDN according to claim 1 dynamically accelerates, is characterized in that: described CDN node pool is connected with intelligent DNS, obtains the IP address of required CDN node in CDN node pool by intelligent DNS.
3. the system that CDN according to claim 1 dynamically accelerates, is characterized in that: in described virtual accelerating network, accelerate node and according to dynamic routing protocol, carry out the selection in path, described dynamic routing protocol comprises OSPF or RIP standard agreement.
4. the method that CDN dynamically accelerates, is characterized in that, described dynamic accelerating method comprises the steps:
(a), between Source Site and CDN node pool, build virtual accelerating network, CDN node in CDN node pool is connected with Source Site by virtual accelerating network, in described virtual accelerating network, comprise some acceleration nodes, between described acceleration node, by VPN, set up tunnel and connect;
(b), by intelligent DNS, be connected with CDN node pool, and obtain the IP address of required CDN node, and using the described CDN node that obtains IP address as service node;
(c), to service node, send access originator site requests, service node is sent in virtual accelerating network the nearest acceleration node of service node described in distance by the Source Site of request by tunnel, usings as access node;
(d), virtual accelerating network by access originator site requests from access node by arriving fast the nearest acceleration node of distance sources website optimal route selection, using as going out tiny node;
(e), access originator site requests reaches after tiny node, utilizes nat technology that access originator site requests is sent to Source Site;
(f), Source Site receives after request, and reply is sent to out to tiny node;
(g), go out tiny node the reply of Source Site is sent to access node;
(h), access node sends to service node by the reply of Source Site, service node sends to user by the reply of Source Site by intelligent DNS.
5. the method that CDN dynamically accelerates according to claim 4, is characterized in that: in described step (b), service node is the nearest CDN node of the intelligent DNS of distance.
6. the method that CDN dynamically accelerates according to claim 4, is characterized in that: in described step (d), accelerate node and according to dynamic routing protocol, carry out the selection in path in described virtual accelerating network, described dynamic routing protocol comprises OSPF or RIP standard agreement.
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| CN104270454A (en) * | 2014-10-14 | 2015-01-07 | 无锡云捷科技有限公司 | CDN dynamic application acceleration method based on data transmission optimizing system |
| CN104506670A (en) * | 2014-12-31 | 2015-04-08 | 北京奇虎科技有限公司 | Method, device and system for establishing online game connection |
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