CN109451002B - CDN node selection method and equipment - Google Patents

CDN node selection method and equipment Download PDF

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Publication number
CN109451002B
CN109451002B CN201811270670.XA CN201811270670A CN109451002B CN 109451002 B CN109451002 B CN 109451002B CN 201811270670 A CN201811270670 A CN 201811270670A CN 109451002 B CN109451002 B CN 109451002B
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cdn node
load rate
edge
mec server
comprehensive
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CN109451002A (en
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张勍
冯毅
盛煜
朱常波
李先达
单丽雅
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/1008—Server selection for load balancing based on parameters of servers, e.g. available memory or workload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The embodiment of the invention discloses a method and equipment for selecting CDN nodes, relates to the field of communication, and realizes selection of CDN nodes with higher service efficiency from edge CDN nodes and external CDN nodes. The specific scheme is as follows: the method comprises the steps that an MEC server receives a DNS request which is sent by a terminal and comprises a domain name, when the domain name is determined to be contained in a stored domain name set, whether the specified load rate of edge CDN nodes in an edge CDN node set meets a preset condition or not is judged, after the specified load rate of each edge CDN node does not meet the preset condition is determined, the DNS request and a first comprehensive load rate are sent to a global load balancer corresponding to the DNS request, an indication message sent by the global load balancer is received, a target CDN node is determined according to the indication message, and the IP address of the target CDN node is sent to the terminal. The embodiment of the invention is used for the process of selecting the CDN node for the terminal.

Description

CDN node selection method and equipment
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a method and equipment for selecting Content Delivery Network (CDN) nodes.
Background
With the development of Mobile internet services and network technologies, a Mobile Edge Computing (MEC) architecture is beginning to emerge. The mobile network Service can be provided by using the MEC architecture, wherein when the CDN Service is provided, a CDN node can be selected by using the MEC architecture so that the terminal can obtain the required content nearby, and the selection of the CDN node can be implemented by using a Domain Name Service (DNS) technology.
In the prior art, the selection process of the CDN nodes is as follows: after receiving a DNS request sent by a terminal, the MEC server may select a node closest to the terminal from among a plurality of connected edge CDN nodes, and return an Internet Protocol (IP) address of the edge CDN node to the terminal. Alternatively, the MEC server may forward the DNS request to a corresponding global load balancer via the core network, so that the global load balancer may select a node closest to the terminal from a plurality of external CDN nodes connected, and return an IP address of the external CDN node to the terminal via the core network and the MEC server.
The prior art at least has the following technical problems: because the edge CDN node and the external CDN node are isolated from each other, the selected CDN node is selected from the edge CDN node or the external CDN node, and selection of a CDN node with higher service efficiency from all CDN nodes, that is, the edge CDN node and the external CDN node cannot be achieved.
Disclosure of Invention
The invention provides a CDN node selection method and equipment, which realize the selection of CDN nodes with higher service efficiency from edge CDN nodes and external CDN nodes.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a CDN node selection method, where the method may include: the method comprises the steps that an MEC server receives a DNS request sent by a terminal, wherein the DNS request comprises a domain name; when the MEC server determines that the stored domain name set contains the domain name, judging whether the specified load rate of the edge CDN node in the edge CDN node set meets a preset condition or not; after determining that the designated load rate of each edge CDN node does not meet the preset condition, the MEC server sends a DNS request and a first comprehensive load rate to a global load balancer corresponding to the DNS request, wherein the first comprehensive load rate is the minimum comprehensive load rate in the comprehensive load rates corresponding to each edge CDN node in the edge CDN node set; the MEC server receives an indication message sent by the global load balancer; and the MEC server determines a target CDN node according to the indication message and sends the IP address of the target CDN node to the terminal.
With reference to the first aspect, in a possible implementation manner, the determining, by the MEC server, the target CDN node according to the indication message may specifically include: if the indication message is used for indicating the MEC server to adopt the edge CDN node, the MEC server determines the edge CDN node corresponding to the first comprehensive load rate as a target CDN node; and if the indication message contains the IP address of the external CDN node, the MEC server determines the external CDN node as the target CDN node.
With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, the method may further include: when determining that the domain name set does not contain the domain name, the MEC server sends a DNS request to the global load balancer through the core network, so that the global load balancer can select an external CDN node according to the DNS request.
With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, the method may further include: and the MEC server sends the IP address of the target edge CDN node to the terminal when determining that the target edge CDN node exists in the edge CDN node set and the specified load rate of the target edge CDN node meets the preset condition, so that the terminal can obtain the required content from the target edge CDN node.
With reference to the first aspect and the possible implementation manners, in another possible implementation manner, the specified load rate of the edge CDN node is at least one of a CPU load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node; or the specified load rate of the edge CDN node is a comprehensive load rate of the edge CDN node, and the comprehensive load rate of the edge CDN node is calculated according to a Central Processing Unit (CPU) load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node.
In a second aspect, the present invention provides a CDN node selection method, where the method may include: the method comprises the steps that a global load balancer receives a DNS request and a first comprehensive load rate sent by an MEC server; the first comprehensive load rate is the minimum comprehensive load rate in the comprehensive load rates corresponding to each edge CDN node in the edge CDN node set, and the comprehensive load rate corresponding to the edge CDN node is obtained by calculation according to the CPU load rate, the read-write load rate and the bandwidth load rate of the edge CDN node; the global load balancer calculates a second comprehensive load rate of external CDN nodes, wherein the external CDN nodes are external CDN nodes which are connected with the MEC server and are closest to the MEC server; if the global load balancer determines that the second comprehensive load rate is smaller than the first comprehensive load rate, sending an indication message including an IP address of an external CDN node to the MEC server; and if the global load balancer determines that the second comprehensive load rate is greater than or equal to the first comprehensive load rate, sending an indication message for indicating the MEC server to adopt the edge CDN node to the MEC server.
In a third aspect, the present invention provides an MEC server, which may include: the device comprises a receiving unit, a judging unit, a sending unit and a determining unit. The terminal comprises a receiving unit, a sending unit and a receiving unit, wherein the receiving unit is used for receiving a DNS request sent by the terminal, and the DNS request comprises a domain name. And the judging unit is used for judging whether the specified load rate of the edge CDN node in the edge CDN node set meets a preset condition or not when the stored domain name set contains the domain name. And the sending unit is used for sending the DNS request and a first comprehensive load rate to a global load balancer corresponding to the DNS request after determining that the specified load rate of each edge CDN node does not meet the preset condition, wherein the first comprehensive load rate is the minimum comprehensive load rate in the comprehensive load rates corresponding to each edge CDN node in the edge CDN node set. And the receiving unit is also used for receiving an indication message sent by the global load balancer. And the determining unit is used for determining the target CDN node according to the indication message. And the sending unit is also used for sending the IP address of the target CDN node to the terminal.
With reference to the third aspect, in a possible implementation manner, the determining unit is specifically configured to: if the indication message is used for indicating the MEC server to adopt the edge CDN node, determining the edge CDN node corresponding to the first comprehensive load rate as a target CDN node; and if the indication message contains the IP address of the external CDN node, determining the external CDN node as the target CDN node.
With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the sending unit is further configured to send, when it is determined that the domain name set does not include the domain name, a DNS request to the global load balancer through the core network.
With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, the sending unit is further configured to send the IP address of the target edge CDN node to the terminal when it is determined that one target edge CDN node exists in the edge CDN node set and the specified load rate of the target edge CDN node meets a preset condition.
With reference to the third aspect and the possible implementation manners described above, in another possible implementation manner, the specified load rate of the edge CDN node is at least one of a CPU load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node; or the specified load rate of the edge CDN node is a comprehensive load rate of the edge CDN node, and the comprehensive load rate of the edge CDN node is calculated according to a CPU load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node.
The specific implementation manner may refer to the behavior function of the MEC server in the CDN node selection method provided in the first aspect or a possible implementation manner of the first aspect.
In a fourth aspect, a global load balancer is provided, the global load balancer comprising: the device comprises a receiving unit, a calculating unit and a sending unit. The receiving unit is used for receiving the DNS request and the first comprehensive load rate sent by the MEC server; the first comprehensive load rate is the minimum comprehensive load rate in the comprehensive load rates corresponding to each edge CDN node in the edge CDN node set, and the comprehensive load rate corresponding to the edge CDN node is obtained by calculation according to the CPU load rate, the read-write load rate and the bandwidth load rate of the edge CDN node. And the computing unit is used for computing a second comprehensive load rate of an external CDN node, wherein the external CDN node is an external CDN node which is connected with the MEC server and is closest to the MEC server. A sending unit, configured to send an indication message including an IP address of an external CDN node to the MEC server if it is determined that the second integrated load rate is smaller than the first integrated load rate; and if the second comprehensive load rate is determined to be greater than or equal to the first comprehensive load rate, sending an indication message for indicating the MEC server to adopt the edge CDN node to the MEC server.
The specific implementation manner may refer to the second aspect or a behavior function of a global load balancer in the CDN node selection method provided by a possible implementation manner of the second aspect.
In a fifth aspect, there is provided an MEC server comprising: at least one processor, a memory, a communication interface, and a communication bus. The processor is connected to the memory and the communication interface through a communication bus, the memory is used for storing computer execution instructions, and when the MEC server runs, the processor executes the computer execution instructions stored in the memory, so that the MEC server executes the CDN node selection method according to the first aspect or any one of possible implementation manners of the first aspect.
In a sixth aspect, a global load balancer is provided, comprising: at least one processor, a memory, a communication interface, and a communication bus. The processor is connected with the memory and the communication interface through a communication bus, the memory is used for storing computer execution instructions, and when the global load balancer runs, the processor executes the computer execution instructions stored in the memory, so that the global load balancer executes the selection method of the CDN node as described in the second aspect.
A seventh aspect provides a computer storage medium having stored thereon computer-executable instructions, which, when executed on an MEC server, cause the MEC server to perform the method for selecting a CDN node as described in the first aspect or any one of the possible implementations of the first aspect.
In an eighth aspect, a global load balancer is provided, on which computer executable instructions are stored, which, when run on the global load balancer, cause the global load balancer to perform the method for selecting a CDN node as in the second aspect.
According to the CDN node selection method provided by the invention, after receiving a DNS request which is sent by a terminal and comprises a domain name, an MEC server determines that a stored domain name set comprises the domain name and determines that the specified load rate of each edge CDN node in the edge CDN node set does not meet a preset condition, the MEC server sends the DNS request and a first comprehensive load rate to a global load balancer corresponding to the DNS request, so that the global load balancer sends an indication message to the MEC server, and the MEC server can determine a target CDN node according to the indication message and send an IP address of the target CDN node to the terminal. Thus, under the condition that the MEC server is determined to be capable of providing CDN service and the service efficiency of each edge CDN node connected with the MEC server is determined to be limited, the global load balancer can compare the comprehensive load rate of the minimum edge CDN node with the comprehensive load rate of the external CDN node closest to the MEC server to select the CDN node with higher service efficiency, and the CDN node with higher service efficiency is selected from the edge CDN node and the external CDN node.
Drawings
Fig. 1 is a simplified schematic diagram of a system architecture to which an embodiment of the present invention may be applied;
fig. 2 is a schematic composition diagram of an MEC server according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a global load balancer according to an embodiment of the present invention;
fig. 4 is a flowchart of a CDN node selection method according to an embodiment of the present invention;
fig. 5 is a schematic composition diagram of another MEC server according to an embodiment of the present invention;
fig. 6 is a schematic composition diagram of another MEC server according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a global load balancer according to another embodiment of the present invention;
fig. 8 is a schematic composition diagram of another global load balancer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a simplified schematic diagram of a system architecture to which an embodiment of the present invention may be applied, as shown in fig. 1, the system architecture may include: a terminal 11, an MEC server 12, a global load balancer 13, at least one edge CDN node 14, at least one external CDN node 15, and a base station 16.
The terminal 11 sends a DNS request to the MEC server 12 via the base station 16 according to an input of a user, where the DNS request includes a domain name, the MEC server 12 determines that a domain name set stored in the MEC server 12 includes the domain name, and sends the DNS request and a first comprehensive load rate to the global load balancer 13 after determining that the specified load rate of each edge CDN node in the at least one edge CDN node 14 does not satisfy a preset condition, where the first comprehensive load rate is a minimum comprehensive load rate among the comprehensive load rates corresponding to each edge CDN node in the at least one edge CDN node 14. The global load balancer 13 compares the first comprehensive load rate with a second comprehensive load rate according to the DNS request, where the second comprehensive load rate is a comprehensive load rate of an external CDN node closest to the MEC server 12 among the at least one external CDN node 15, and sends an indication message to the MEC server 12 according to a comparison result, so that the MEC server 12 determines a target CDN node according to the indication message and sends an IP address of the target CDN node to the terminal 11.
The terminal 11 may be a mobile terminal in a specific implementation, such as a mobile phone and a computer with a mobile terminal, or a portable, pocket, handheld, computer-embedded or vehicle-mounted mobile device, for example, a Personal Communication Service (PCS) phone, a cordless phone, a mobile phone, or the like.
The MEC server 12 may provide rich mobile network services, and in the CDN service, the MEC server 12 may implement a simpler CDN service topology.
The global load balancer 13 grasps information of at least one external CDN node 15 and corresponds to the DNS transmitted by the terminal 11.
At least one edge CDN node 14 is an operator's own CDN node, and is isolated from at least one external CDN node 15.
At least one external CDN node 15 is a CDN node belonging to an external CDN service provider.
Fig. 2 is a schematic composition diagram of an MEC server according to an embodiment of the present invention, and as shown in fig. 2, the MEC server may include: at least one processor 21, a memory 22, a communication interface 23, and a communication bus 24.
The following describes each component of the MEC server in detail with reference to fig. 2:
the processor 21 is a control center of the MEC server, and may be a single processor or a collective term for a plurality of processing elements. For example, the processor 21 is a CPU, and may be an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).
In particular implementations, processor 21 may include one or more CPUs such as CPU0 and CPU1 shown in fig. 2 as one example. Also, as an embodiment, the MEC server may include a plurality of processors, such as the processor 21 and the processor 25 shown in fig. 2. Each of these processors may be a Single-core processor (Single-CPU) or a Multi-core processor (Multi-CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
The Memory 22 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 22 may be self-contained and coupled to the processor 21 via a communication bus 24. The memory 22 may also be integrated with the processor 21.
In a particular implementation, the memory 22 is used for storing data in the present invention and software programs for implementing the present invention. The processor 21 may perform various functions of the MEC server by running or executing software programs stored in the memory 22 and calling up data stored in the memory 22.
The communication interface 23 is a device such as any transceiver, and is used for communicating with other devices or communication Networks, such as a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), a global load balancer, and the like. The communication interface 23 may include a receiving unit implementing a receiving function and a transmitting unit implementing a transmitting function.
The communication bus 24 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (enhanced Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 2, but it is not intended that there be only one bus or one type of bus.
Fig. 3 is a schematic diagram illustrating a global load balancer provided in an embodiment of the present invention, and as shown in fig. 3, the global load balancer may include: at least one processor 31, a memory 32, a communication interface 33, and a communication bus 34.
The following describes each component of the global load balancer in detail with reference to fig. 3:
the processor 31 is a control center of the global load balancer, and may be a single processor or a collective term for multiple processing elements. For example, the processor 21 is a CPU, may be an ASIC, or may be one or more integrated circuits configured to implement embodiments of the present invention, such as: one or more DSPs, or one or more FPGAs.
In particular implementations, processor 31 may include one or more CPUs such as CPU0 and CPU1 shown in fig. 3 as one example. Also, as an embodiment, the global load balancer may include a plurality of processors, such as the processor 31 and the processor 35 shown in fig. 3. Each of these processors may be a single core processor or a multi-core processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
Memory 32 may be, but is not limited to, ROM or other type of static storage device that can store static information and instructions, RAM or other type of dynamic storage device that can store information and instructions, EEPROM, CD-ROM or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 32 may be self-contained and coupled to the processor 31 via a communication bus 34. The memory 32 may also be integrated with the processor 31.
In a particular implementation, the memory 32 is used for storing data and software programs for implementing the present invention. Processor 31 may perform various functions of the global load balancer by running or executing software programs stored in memory 32, as well as invoking data stored in memory 32.
The communication interface 33, using any transceiver or like device, is used for communication with other equipment or communication networks, such as RAN, WLAN, MEC server, etc. The communication interface 33 may include a receiving unit implementing a receiving function and a transmitting unit implementing a transmitting function.
The communication bus 34 may be an ISA bus, a PCI bus, an EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 3, but this does not mean only one bus or one type of bus.
In order to realize selection of a CDN node with higher service efficiency from an edge CDN node and an external CDN node, an embodiment of the present invention provides a CDN node selection method, where as shown in fig. 4, the method may include:
401. the terminal sends a DNS request to the MEC server.
Wherein, the DNS request includes a domain name. When a user needs to acquire data through the terminal, an input operation can be performed on the terminal, so that the terminal can send a DNS request including a domain name to the MEC server through the base station according to the input of the user.
402. The MEC server receives a DNS request sent by the terminal.
After receiving the DNS request, the MEC server may identify a domain name included in the DNS request, and determine whether the domain name set stored in the MEC server includes the domain name, and if not, it indicates that the MEC server cannot provide the CDN service for the terminal, and at this time, the following step 403 may be executed. If so, indicating that the MEC server can provide CDN services for the terminal, the following step 404 may be performed.
403. And when determining that the stored domain name set does not contain the domain name, the MEC server sends a DNS request to the global load balancer through the core network.
When determining that the domain name set stored by the MEC server does not contain the domain name of the DNS request, the MEC server may send the DNS request to the global load balancer corresponding to the DNS request through the core network, so that the global load balancer selects an external CDN node for the terminal according to the DNS request.
404. And when the MEC server determines that the stored domain name set contains the domain name, judging whether the specified load rate of the edge CDN node in the edge CDN node set meets a preset condition or not.
The specified load rate of the edge CDN node may be at least one of a CPU load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node; or the specified load rate of the edge CDN node is the integrated load rate of the edge CDN node. Independent threshold values are set for the CPU load rate, the read-write load rate, the bandwidth load rate and the comprehensive load rate. It should be noted that the specified load rate may include other load rate indexes capable of evaluating the load condition of the CDN node in addition to the CPU load rate, the read-write load rate, and the bandwidth load rate, and accordingly, the comprehensive load rate may be obtained according to the CPU load rate, the read-write load rate, the bandwidth load rate, and other load rate indexes.
When determining that the domain name set stored by the MEC server contains the domain name requested by the DNS, the MEC server may determine whether an assigned load rate of an edge CDN node in an edge CDN node set connected to the MEC server satisfies a preset condition. Specifically, for any edge CDN node in the edge CDN node set, the MEC server may determine whether the specified load rate of the edge CDN node is less than or equal to a corresponding threshold, if so, indicate that the specified load rate of the edge CDN node satisfies a preset condition, the edge CDN node may provide efficient service efficiency, and if not, indicate that the specified load rate of the edge CDN node does not satisfy the preset condition, and the edge CDN node may provide limited service efficiency.
In the embodiment of the present invention, the integrated load rate refers to an integrated load condition in which a plurality of load rates are weighted. Specifically, assuming that the CPU load rate, the read-write load rate, and the bandwidth load rate of the edge CDN node are Y1, Y2, and Y3, respectively, the integrated load rate of the edge CDN node may be: q ═ P (X1, Y1+ X2, Y2+ X3, Y3), where X1, X2, X3 are weighting coefficients corresponding to CPU load rate, read-write load rate, bandwidth load rate, 0 ≦ Xn ≦ 1, n ≦ 1, 2, 3, and X1+ X2+ X3 ═ 1; and P is a node capacity difference coefficient and is used for balancing the basic load capacity of the edge CDN node and the external CDN node. And the values of X1, X2, X3, and P are determined by the operator and may be stored in the MEC server in advance, where the setting of the weighting coefficient corresponding to the load rate that has a more significant influence on the service efficiency of the edge CDN node is larger, and the setting of the weighting coefficient corresponding to the load rate that has a less significant influence on the service efficiency of the edge CDN node is smaller. For P, if the basic load capacity of the external CDN node is higher than that of the edge CDN node, P is greater than 1, and the larger the capability difference is, the larger P is, and if the basic load capacity of the external CDN node is lower than that of the edge CDN node, P is less than 1, and the larger the capability difference is, the smaller P is.
405. And the MEC server determines that a target edge CDN node exists in the edge CDN node set, and sends the IP address of the target edge CDN node to the terminal when the specified load rate of the target edge CDN node meets the preset condition.
The method includes the steps that an MEC server determines that CDN service can be provided for a terminal and determines that a target edge CDN node exists in an edge CDN node set, and the target edge CDN node can provide high-efficiency service efficiency, and sends an IP address of the target edge CDN node to the terminal.
It should be noted that, in the embodiment of the present invention, in the edge CDN node set, there may be a plurality of edge CDN nodes whose specified load rates meet the preset condition, and at this time, the target edge CDN node may be any one of the plurality of edge CDN nodes. Or, if the specified load rate is the comprehensive load rate and there are a plurality of edge CDN nodes that satisfy the preset condition, the target edge CDN node may be a CDN node corresponding to the minimum comprehensive load rate among the plurality of edge CDN nodes.
406. And the terminal receives the IP address of the target edge CDN node sent by the MEC server.
After receiving the IP address of the target edge CDN node sent by the MEC server, the terminal may obtain data from the target edge CDN node via the MEC server according to the IP address.
407. And after determining that the designated load rate of each edge CDN node does not meet the preset condition, the MEC server sends a DNS request and a first comprehensive load rate to the global load balancer.
The first comprehensive load rate is the minimum comprehensive load rate in the comprehensive load rates corresponding to each edge CDN node in the edge CDN node set.
408. The global load balancer receives the DNS request and the first comprehensive load rate sent by the MEC server.
409. And the global load balancer calculates a second comprehensive load rate of the external CDN node.
The external CDN node is the external CDN node which is closest to the MEC server in the external CDN nodes connected with the MEC server.
It should be noted that, in the embodiment of the present invention, the calculation of the comprehensive load rate of the external CDN node is similar to the calculation of the comprehensive load rate of the edge CDN node, and reference may be made to the description of the comprehensive load rate of the edge CDN node in step 404 for specific description of the comprehensive load rate of the external CDN node.
410. And if the global load balancer determines that the second comprehensive load rate is smaller than the first comprehensive load rate, sending an indication message including the IP address of the external CDN node to the MEC server.
411. And the MEC server receives an indication message which is sent by the global load balancer and comprises the IP address of the external CDN node.
412. And the MEC server sends the IP address of the external CDN node to the terminal.
413. And the terminal receives the IP address of the external CDN node sent by the MEC server.
After receiving the IP address of the external CDN node sent by the MEC server, the terminal may obtain data from the external CDN node via the MEC server according to the IP address.
414. And if the global load balancer determines that the second comprehensive load rate is greater than or equal to the first comprehensive load rate, sending an indication message for indicating the MEC server to adopt the edge CDN node to the MEC server.
415. And the MEC server receives an indication message which is sent by the global load balancer and used for indicating the MEC server to adopt the edge CDN node.
416. And the MEC server sends the IP address of the edge CDN node corresponding to the first comprehensive load rate to the terminal.
417. And the terminal receives the IP address of the edge CDN node corresponding to the first comprehensive load rate sent by the MEC server.
According to the CDN node selection method provided by the invention, after receiving a DNS request which is sent by a terminal and comprises a domain name, an MEC server determines that a stored domain name set comprises the domain name and determines that the specified load rate of each edge CDN node in the edge CDN node set does not meet a preset condition, the MEC server sends the DNS request and a first comprehensive load rate to a global load balancer corresponding to the DNS request, so that the global load balancer sends an indication message to the MEC server, and the MEC server can determine a target CDN node according to the indication message and send an IP address of the target CDN node to the terminal. Thus, under the condition that the MEC server is determined to be capable of providing CDN service and the service efficiency of each edge CDN node connected with the MEC server is determined to be limited, the global load balancer can compare the comprehensive load rate of the minimum edge CDN node with the comprehensive load rate of the external CDN node closest to the MEC server to select the CDN node with higher service efficiency, and the CDN node with higher service efficiency is selected from the edge CDN node and the external CDN node.
The above description mainly introduces the scheme provided by the embodiment of the present invention from the perspective of interaction of various devices. It is understood that each device, such as MEC server, global load balancer, for implementing the above functions, includes corresponding hardware structures and/or software modules for performing each function. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, in conjunction with the exemplary algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiment of the present invention, functional modules of the MEC server and the global load balancer may be divided according to the above method, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
In the case of dividing each functional module by corresponding functions, fig. 5 shows another possible composition diagram of the MEC server involved in the foregoing embodiment, as shown in fig. 5, the MEC server may include: a receiving unit 51, a judging unit 52, a transmitting unit 53, and a determining unit 54.
The receiving unit 51 is configured to support the MEC server to execute step 402, step 411, and step 415 in the CDN node selection method shown in fig. 4.
The determining unit 52 is configured to support the MEC server to execute step 404 in the CDN node selection method shown in fig. 4.
The sending unit 53 is configured to support the MEC server to execute step 403, step 405, step 407, step 412, and step 416 in the CDN node selection method shown in fig. 4.
A determining unit 54, configured to support the MEC server to execute the determination of the target CDN node in the CDN node selection method shown in fig. 4.
It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
The MEC server provided by the embodiment of the invention is used for executing the selection method of the CDN node, so that the same effect as the selection method of the CDN node can be achieved.
In case of an integrated unit, fig. 6 shows another possible composition diagram of the MEC server involved in the above embodiments. As shown in fig. 6, the MEC server includes: a processing module 61, a communication module 62 and a storage module 63.
The processing module 61 is used to control and manage the actions of the MEC server, e.g., the processing module 61 is used to support the MEC server to perform step 404 in fig. 4, and/or other processes for the techniques described herein. The communication module 62 is used to support the communication of the MEC server with other network entities, such as a global load balancer. For example, the communication module 62 is configured to support the MEC server to perform step 402, step 403, step 405, step 407, step 411, step 412, step 415, and step 416 in fig. 4. And the storage module 63 is used for storing the program codes and data of the MEC server.
The processing module 61 may be the processor in fig. 2. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. The communication module 62 may be the communication interface in fig. 2. The storage module 63 may be the memory of fig. 2.
In the case of dividing each functional module by corresponding functions, fig. 7 shows another possible composition diagram of the global load balancer involved in the foregoing embodiments, as shown in fig. 7, the global load balancer may include: a receiving unit 71, a calculating unit 72 and a transmitting unit 73.
The receiving unit 71 is configured to support the global load balancer to execute step 408 in the CDN node selection method shown in fig. 4.
The calculating unit 72 is configured to support the global load balancer to execute step 409 in the CDN node selection method shown in fig. 4.
The sending unit 73 is configured to support the global load balancer to execute step 410 and step 414 in the CDN node selection method shown in fig. 4.
It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
The global load balancer provided by the embodiment of the invention is used for executing the selection method of the CDN node, so that the effect same as that of the selection method of the CDN node can be achieved.
In case of integrated units, fig. 8 shows another possible composition diagram of the global load balancer involved in the above embodiments. As shown in fig. 8, the global load balancer includes: a processing module 81, a communication module 82 and a storage module 83.
Processing module 81 is used to control and manage the actions of the global load balancer, e.g., processing module 81 is used to support the global load balancer to perform step 409 in fig. 4, and/or other processes for the techniques described herein. The communication module 82 is used to support the communication of the global load balancer with other network entities, such as MEC servers. For example, the communication module 82 is configured to support the global load balancer to perform steps 408, 410, and 414 in fig. 4. A storage module 83 for storing program codes and data of the global load balancer.
The processing module 81 may be the processor in fig. 3. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. The communication module 82 may be the communication interface of fig. 3. The storage module 83 may be the memory of fig. 3.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be essentially or partially contributed to by the prior art, or all or part of the technical solution may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions within the technical scope of the present invention are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (16)

1. A method for selecting CDN nodes of a content delivery network is characterized by comprising the following steps:
a mobile edge computing MEC server receives a Domain Name Service (DNS) request sent by a terminal, wherein the DNS request comprises a domain name;
when the MEC server determines that the stored domain name set contains the domain name, judging whether the specified load rate of the edge CDN node in the edge CDN node set meets a preset condition or not;
after determining that the designated load rate of each edge CDN node does not meet the preset condition, the MEC server sends the DNS request and a first comprehensive load rate to a global load balancer corresponding to the DNS request, wherein the first comprehensive load rate is the minimum comprehensive load rate in the comprehensive load rates corresponding to each edge CDN node in the edge CDN node set;
the MEC server receives an indication message sent by the global load balancer; if the second comprehensive load rate is smaller than the first comprehensive load rate, the indication message comprises an IP address of an external CDN node; if the second comprehensive load rate is greater than or equal to the first comprehensive load rate, the indication message is used for indicating the MEC server to adopt the edge CDN node; the second comprehensive load rate is the comprehensive load rate of the external CDN node;
and the MEC server determines a target CDN node according to the indication message and sends an internet protocol IP address of the target CDN node to the terminal.
2. The method for selecting a CDN node as recited in claim 1, wherein the determining, by the MEC server, a target CDN node according to the instruction message includes:
if the indication message is used for indicating that the MEC server adopts an edge CDN node, the MEC server determines the edge CDN node corresponding to the first comprehensive load rate as the target CDN node;
if the indication message contains the IP address of the external CDN node, the MEC server determines the external CDN node as the target CDN node.
3. The CDN node selection method of claim 1 or 2, wherein the method further comprises:
and when the MEC server determines that the domain name set does not contain the domain name, the MEC server sends the DNS request to the global load balancer through a core network.
4. The CDN node selection method of claim 1, further comprising:
and the MEC server sends the IP address of the target edge CDN node to the terminal when determining that the target edge CDN node exists in the edge CDN node set and the specified load rate of the target edge CDN node meets the preset condition.
5. The CDN node selection method of claim 1 or 4 wherein the specified load rate of the edge CDN node is at least one of a CPU load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node; or the specified load rate of the edge CDN node is a comprehensive load rate of the edge CDN node, and the comprehensive load rate of the edge CDN node is calculated according to a CPU load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node.
6. A method for selecting CDN nodes of a content delivery network is characterized by comprising the following steps:
the method comprises the steps that a global load balancer receives a Domain Name Service (DNS) request and a first comprehensive load rate sent by a Mobile Edge Computing (MEC) server; the first comprehensive load rate is the minimum comprehensive load rate in the comprehensive load rates corresponding to each edge CDN node in the edge content delivery network CDN node set, and the comprehensive load rate corresponding to the edge CDN node is obtained by calculation according to the CPU load rate, the read-write load rate and the bandwidth load rate of the edge CDN node;
the global load balancer calculates a second comprehensive load rate of external CDN nodes, wherein the external CDN nodes are external CDN nodes which are connected with the MEC server and are closest to the MEC server;
if the global load balancer determines that the second comprehensive load rate is smaller than the first comprehensive load rate, sending an indication message including an Internet Protocol (IP) address of the external CDN node to the MEC server;
and if the global load balancer determines that the second comprehensive load rate is greater than or equal to the first comprehensive load rate, sending an indication message for indicating the MEC server to adopt an edge CDN node to the MEC server.
7. A mobile edge computing, MEC, server, the MEC server comprising: the device comprises a receiving unit, a judging unit, a sending unit and a determining unit;
the receiving unit is configured to receive a domain name service DNS request sent by a terminal, where the DNS request includes a domain name;
the judging unit is used for judging whether the specified load rate of the edge CDN node in the edge CDN node set meets a preset condition or not when the stored domain name set contains the domain name;
the sending unit is configured to send the DNS request and a first comprehensive load rate to a global load balancer corresponding to the DNS request after determining that the specified load rate of each edge CDN node does not satisfy the preset condition, where the first comprehensive load rate is a minimum comprehensive load rate among the comprehensive load rates corresponding to each edge CDN node in the edge CDN node set;
the receiving unit is further configured to receive an indication message sent by the global load balancer; if the second comprehensive load rate is smaller than the first comprehensive load rate, the indication message comprises an IP address of an external CDN node; if the second comprehensive load rate is greater than or equal to the first comprehensive load rate, the indication message is used for indicating the MEC server to adopt the edge CDN node; the second comprehensive load rate is the comprehensive load rate of the external CDN node;
the determining unit is configured to determine a target CDN node according to the indication message;
the sending unit is further configured to send the internet protocol IP address of the target CDN node to the terminal.
8. The MEC server according to claim 7, wherein the determining unit is specifically configured to:
if the indication message is used for indicating that the MEC server adopts an edge CDN node, determining the edge CDN node corresponding to the first comprehensive load rate as the target CDN node;
and if the indication message contains the IP address of the external CDN node, determining the external CDN node as the target CDN node.
9. The MEC server of claim 7 or 8,
the sending unit is further configured to send the DNS request to the global load balancer via a core network when it is determined that the domain name set does not include the domain name.
10. The MEC server of claim 7,
the sending unit is further configured to send an IP address of the target edge CDN node to the terminal when it is determined that the target edge CDN node exists in the edge CDN node set and the specified load rate of the target edge CDN node meets the preset condition.
11. The MEC server of claim 7 or 10, wherein the specified load rate of the edge CDN node is at least one of a CPU load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node; or the specified load rate of the edge CDN node is a comprehensive load rate of the edge CDN node, and the comprehensive load rate of the edge CDN node is calculated according to a CPU load rate, a read-write load rate, and a bandwidth load rate of the edge CDN node.
12. A global load balancer, the global load balancer comprising: a receiving unit, a calculating unit and a transmitting unit;
the receiving unit is used for receiving a Domain Name Service (DNS) request and a first comprehensive load rate sent by a Mobile Edge Computing (MEC) server; the first comprehensive load rate is the minimum comprehensive load rate in the comprehensive load rates corresponding to each edge CDN node in the edge content delivery network CDN node set, and the comprehensive load rate corresponding to the edge CDN node is obtained by calculation according to the CPU load rate, the read-write load rate and the bandwidth load rate of the edge CDN node;
the computing unit is configured to compute a second comprehensive load rate of an external CDN node, where the external CDN node is an external CDN node closest to the MEC server in the external CDN nodes connected to the MEC server;
the sending unit is configured to send an indication message including an internet protocol IP address of the external CDN node to the MEC server if it is determined that the second integrated load rate is smaller than the first integrated load rate; and if the second comprehensive load rate is determined to be greater than or equal to the first comprehensive load rate, sending an indication message for indicating the MEC server to adopt the edge CDN node to the MEC server.
13. A mobile edge computing, MEC, server, the MEC server comprising: a processor, a memory, a communication interface, and a communication bus;
the processor is connected to the memory and the communication interface through the communication bus, the memory is used for storing computer execution instructions, and when the MEC server runs, the processor executes the computer execution instructions stored in the memory, so that the MEC server executes the CDN node selection method according to any one of claims 1 to 5.
14. A global load balancer, the global load balancer comprising: a processor, a memory, a communication interface, and a communication bus;
the processor is connected to the memory and the communication interface through the communication bus, the memory is used for storing computer-executable instructions, and when the global load balancer runs, the processor executes the computer-executable instructions stored in the memory, so that the global load balancer executes the CDN node selection method according to claim 6.
15. A computer storage medium comprising computer executable instructions that, when run on a mobile edge computing, MEC, server, cause the MEC server to perform the CDN node selection method of any one of claims 1-5.
16. A computer storage medium comprising computer-executable instructions that, when executed on a global load balancer, cause the global load balancer to perform the CDN node selection method of claim 6.
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