KR101758065B1 - Load balancing system, method for controlling the same and recording medium for performing the ethod - Google Patents

Load balancing system, method for controlling the same and recording medium for performing the ethod Download PDF

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Publication number
KR101758065B1
KR101758065B1 KR1020160024282A KR20160024282A KR101758065B1 KR 101758065 B1 KR101758065 B1 KR 101758065B1 KR 1020160024282 A KR1020160024282 A KR 1020160024282A KR 20160024282 A KR20160024282 A KR 20160024282A KR 101758065 B1 KR101758065 B1 KR 101758065B1
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South Korea
Prior art keywords
server
information
dlp
dlp server
usage
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KR1020160024282A
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Korean (ko)
Inventor
정수환
송왕은
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숭실대학교산학협력단
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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
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/02—Standardisation; Integration
    • H04L41/0213—Standardised network management protocols, e.g. simple network management protocol [SNMP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management

Abstract

The present invention provides a load balancing system.
A DLP server for generating DLP server information; a DLP server for receiving DLP server information from the DLP server and receiving a DLP server request signal from a client, A controller for receiving the data flow information from the load balancing server and generating a data flow table based on the received data flow information; a controller for receiving the data flow table from the controller, And a switch for distributing data of the client to the DLP server.

Description

Technical Field [0001] The present invention relates to a load balancing system, a control method thereof, and a recording medium for performing the same.

The present invention relates to a load distribution system, a control method therefor, and a recording medium for performing the method, and more particularly, to a load distribution system including a load distribution server capable of distributing client data to a plurality of DLP servers, A recording medium is provided.

Load balancing is a method of resolving server bottlenecks and overloading resources when overhead is requested by a large number of users. As the number of users who use the service increases, This is an important issue in securing performance.

Server bottlenecks in a distributed environment reduce the reliability of performance for users wishing to receive services. Therefore, it is possible to maintain reliability and safety of performance by distributing a plurality of servers for a plurality of users.

In general, the scheduling algorithm used in the existing server environment to distribute the load includes a round-robin method of sequentially connecting the users requesting the service to the servers, a method of assigning different performance weights to real servers, A weighted round-robin scheme that connects users sequentially to the server, a least-connection scheme that connects to the server with the fewest number of connected sessions, and a method that connects to a server with a fast response time A Fastest Response Time method, and a fixed method for connecting a specific user to a designated server.

However, these methods do not take into account the current resource usage of the server and the data usage that is different for each user.

According to an aspect of the present invention, there is provided a load balancing system, a control method thereof, and a recording medium for performing the same, the method comprising the steps of: measuring a current resource usage of a DLP server and transmitting user data to a plurality of DLP servers A load balancing system including the load balancing server for distributing the load balancing server, a control method thereof, and a recording medium for performing the same.

The DLP server generates DLP server information. When the DLP server receives DLP server information from the DLP server and receives a DLP server request signal from the client, A controller for receiving the data flow information from the load distribution server and generating a data flow table based on the received data flow information, and a controller for receiving the data flow table from the controller And a switch for distributing data of the client to the DLP server according to the received data flow table.

The load balancing server calculates resource usage of each DLP server based on the DLP server information, generates DLP server usage ranking information based on the resource usage amount, and based on the generated DLP server usage ranking information, Lt; / RTI >

The resource usage amount is generated based on usage amounts of CPU, memory, and network traffic, and is set such that the weight of the memory usage amount is the highest.

The DLP server request signal includes necessary resource usage information required for processing data of the client, and generating the data flow information based on the generated DLP server usage ranking information includes: Comparing the available resource usage information of the DLP server with the required resource usage information required to process the client's data and sending all the client's data to the DLP server having the highest priority when the required resource usage is smaller than the available resource, And to generate the data flow information for distributing the amount of data that the highest priority DLP server can not accommodate according to the DLP server usage ranking information when the required resource usage amount is larger than the available resource.

Wherein the generating of the data flow information includes distributing the amount of data that the highest priority DLP server can not accommodate to all DLP servers available according to the DLP server usage ranking information, And redistributing the data according to the DLP server usage ranking information.

The load balancing server and the DLP server may exchange the memory usage information based on the SNMP protocol, the load balancing server may use a PHP script, and the DLP server may use a shell script.

A recording medium according to another embodiment of the present invention can be recorded with a computer program for providing a load distribution system.

In another aspect of the present invention, there is provided a method of controlling a load distribution system including a plurality of DLP servers, a load distribution server, a controller, and a switch for processing client data, And transmits the generated server information to the load distribution server. The load distribution server calculates a resource usage amount of each DLP server based on the DLP server information, and generates DLP server usage amount ranking information based on the calculated resource usage amount And generates and transmits data flow information based on the DLP server usage order information to the controller when receiving a DLP server request signal from the client, and the controller generates a data flow table based on the data flow information, , And the switch Depending on the block may include the distribution server to the DLP data of the client.

Wherein the DLP server information includes a usage amount of a CPU, memory, and network traffic of the DLP server, and calculating a resource usage amount of each DLP server based on the DLP server information is based on usage amounts of CPU, memory, And the weight of the memory usage may be set to be the highest.

The DLP server request signal includes necessary resource usage information required for processing data of the client, and generating the data flow information based on the generated DLP server usage ranking information includes: Comparing the available resource usage information of the DLP server with the required resource usage information required to process the client's data and sending all the client's data to the DLP server having the highest priority when the required resource usage is smaller than the available resource, And to generate the data flow information for distributing the amount of data that the highest priority DLP server can not accommodate according to the DLP server usage ranking information when the required resource usage amount is larger than the available resource.

Generating the data flow information includes distributing the amount of data that the highest priority DLP server can not accommodate to all available DLP servers according to the DLP server usage ranking information and if the data of the client remains, And redistributing the data according to the DLP server usage ranking information.

According to an aspect of the present invention, a load balancing system, a control method thereof, and a recording medium for performing the load balancing system are configured such that the load balancing server measures the current resource usage of the DLP server, and based on the measured current resource usage, The overload problem of a specific server can be prevented by distributing the DLP server to a plurality of DLP servers.

1 is a configuration diagram of a load distribution system according to an embodiment of the present invention.
2 is a block diagram showing the configuration of blocks of the load distribution server and the DLP server of FIG. 1 of the present invention.
3 is a flowchart of a load balancing system according to an embodiment of the present invention.
4 is a flowchart of a method of controlling a load distribution system according to an embodiment of the present invention.
5 is a conceptual diagram showing an example for explaining the concept of an SFC applied to the data flow of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views. Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a configuration diagram of a load distribution system according to an embodiment of the present invention.

Referring to FIG. 1, a load balancing system 100 may include a DLP server 110, a load balancing server 120, a controller 130, and a switch 140.

The DLP server 110 can periodically generate DLP server information and periodically transmit the generated DLP server information to the load distribution server 120. [ At this time, there may be a plurality of DLP servers 110, and each DLP server 110 may transmit DLP server information to one load distribution server 120. In addition, the DLP server information may include information such as CPU, memory, and network traffic. The DLP server 110 can receive the data of the client 10 from the client 10 according to the operation of the switch 140 and prevent the leakage of the information of the client 10 transmitted through the leakage information prevention solution can do.

The DLP server 110 according to another embodiment of the present invention can change the DLP server information generation period according to the number of clients connected to the DLP server 110. [ More specifically, as the number of clients connected to the DLP server 110 increases, the DLP server 110 may shorten the DLP server information generation period to accurately measure the resource usage of the DLP server 110. [ For example, the DLP server 110 to which ten client numbers are connected may have a shorter DLP server information generation period than the DLP server 110 to which one client is connected. The DLP server 110 may change the period of delivering the generated DLP server information to the load balancing server 120 according to the changed DLP server information generation period.

The load distribution server 120 can receive the DLP server information generated by the DLP server 110 from the plurality of DLP servers 110 and can receive the DLP server request signal from the client 10. At this time, the client 10 may be a server, a computer, or the like used by a person who wants to use the DLP service, and may exchange information with the load distribution server 120 in various ways.

When receiving the DLP server request signal from the client 10, the load distribution server 120 may generate the data flow information based on the DLP server information received from the DLP server 110. At this time, the generation of the data flow information based on the DLP server information is performed by calculating the resource usage based on the DLP server information, generating the DLP server usage ranking information based on the calculated resource usage, And to generate data flow information including a data distribution sequence to the DLP server 110 determined according to the information.

Here, the resource usage is calculated based on the amount of CPU, memory, and network traffic included in the DLP server information, and the ratio of the memory usage, which is the most important factor when the DLP server 110 performs network filtering, It may be to calculate resource usage. More details for calculating resource usage can be found in the following equations.

[Equation 1]

Figure 112016019728312-pat00001

In Equation (1)

Figure 112016019728312-pat00002
A is the Percent of Memory usage, b is the Percent of CPU usage, and c is the Percent of Network usage. That is, the resource usage of an arbitrary DLP server 110 may be calculated through an average of weighted elements (CPU, memory, and network traffic).

On the other hand, generating the DLP server usage rank information based on the calculated resource usage can be performed by assigning a rank to the DLP server having the smallest calculated resource usage amount, and in some cases, Additional ranking can be given. In this case, when the same resource usage is calculated among the calculated plurality of resource usage amounts, it may be that priority is given to the one with the smallest memory usage amount and priority to the case where the CPU usage amount is small if the memory usage amount is also the same.

In addition, the generation of the data flow information including the data distribution order to the determined DLP server 110 may be performed using SFC (Service Function Chaining). An SFC is a technique for sequentially constructing a plurality of service functions (SFs) in a single logical chain. For example, referring to FIG. 5, when a flow enters the network, flows are classified by the classifier into the first chain (SF1-SF2-SF3-SF4) and the second chain (SF1-SF2-SF5) The flows are sequentially delivered and processed according to the determined service function chain. In this manner, the load distribution server 120 can form a chain with the DLP server usage ranking information and generate the data flow information including the formed chain.

The DLP server 110 according to another embodiment of the present invention may transmit the DLP server information to the load balancing server 120 using a Simple Network Management Protocol (SNMP) method. SNMP is a protocol used in the application layer of the TCP / IP layer to manage or monitor network equipment. It can operate in the form of a manager and an agent. That is, the management manager corresponds to the load balancing server 120, and the management object corresponds to the DLP server 110. [ 2, when the load balancing server 120, which is a management manager, requests the information of the DLP server 110, the load balancing server 120 and the DLP server 110, The DLP server 110, which is a management target, transfers the DLP server information to the load distribution server 120, and the load distribution server 120 analyzes the received data to construct a database.

In this case, the DLP server 110 may transmit information to the protocol using a shell script, and the load balancing server 120 may retrieve information from the protocol using a PHP script.

The load balancing server 120 according to another embodiment of the present invention may receive from the client 10 the necessary resource usage amount necessary for processing data of the client 10. [ The required resource usage amount required for processing the data of the client 10 may be generated by the client 10 and transmitted as a DLP server request signal. Meanwhile, the load balancing server 120 may compare the amount of required resources used and the amount of available resources of the highest priority DLP server. Here, the available resource usage amount of the DLP server 110 may be the amount of resources excluding the current resource usage amount from the maximum amount of resources that the DLP server 110 can accommodate. The load distribution server 120 transmits data flow information for sending all the data of the client 10 to the highest priority DLP server 110 when the required resource usage amount received is smaller than the available resource usage amount of the highest priority DLP server 110 Can be generated.

On the other hand, when the amount of required resource to be transferred is greater than the available resource amount of the highest priority DLP server 110, the load distribution server 120 allocates the highest available resource amount of the DLP server 110 to the highest priority DLP server 110 It is possible to generate data flow information for sending the data of the corresponding client 10 and sending the remaining data to the DLP server 110 of the next rank.

At this time, the load distribution server 120 sends the data of the client 10 to all the DLP servers 110 as much as the available resource usage of each DLP server 110, but if the data of the client 10 remains, It is possible to cause the DLP server 110 to redistribute the remaining data in the same order as before.

The load balancing server 120 according to another embodiment of the present invention sends the data of the client 10 as much as the available resource usage of each DLP server 110 to all the DLP servers 110, The DLP server 110 distributes all the data that can be processed to all the DLP servers 110 and distributes the remaining data of the clients 10 in the order of the DLP server 110 in which the available resources are generated in real time, And this information may be generated by receiving information from the DLP server 110 in real time.

The load balancing server 120 according to another exemplary embodiment of the present invention distributes the resources of the DLP server 110 to the client 110 in a manner that is inversely proportional to the resource usage rate of each DLP server 110 when the required resource usage amount received is larger than the available resource usage amount of the highest priority DLP server 110 It is possible to generate the data flow information for distributing the data of the terminal 10. For example, when the resource usage amounts of the four DLP servers 110 are 10%, 20%, 30%, and 40%, respectively, the data of the client 10 is 1/10: 1/20: 1/30: 40 < / RTI >

The controller 130 can receive the data flow information generated by the load distribution server 120 from the load distribution server 120 and can generate the data flow table based on the received data flow information. For example, in the load balancing system 100 including the four DLP servers 110, the controller 130 determines the distribution order of the second DLP server, the first DLP server, the fourth DLP server, The first DLP server, the fourth DLP server, and the third DLP server in the order of the data flow information received by the load balancing server 120 A data flow table for controlling the operation of the switch 140 can be generated.

At this time, when the amount of resource required for processing the data of the client 10 exceeds the resource usage amount available for the DLP server having the minimum usage amount, the data flow information is used to distribute unaccepted data to the next DLP server And the controller 130 may generate a data flow table for operating a plurality of DLP servers according to the data flow information.

The switch 140 can receive the data flow table generated by the controller 130 from the controller 130 and the data of the client 10 distributed to the plurality of DLP servers 10 according to the received data flow table Lt; / RTI >

Here, the controller 130 and the switch 140 may be of a soft-ware-defined networking (SDN) scheme. SDN is a network structure for accurately ascertaining the network size according to the traffic increase and traffic pattern dynamically. SDN can cope with the change of traffic pattern effectively because it can construct a complicated route configuration that can not be configured in the existing network, It has the advantage of being able to configure the network quickly, and it can build the large network needed for Big Data analysis at a small cost. The SDN is formed of a network structure in which a control plane for controlling a network and a data plane for moving an actual network packet are separated. A controller 130 plays a role of a control plane, and a switch 140 plays a role of a data plane. Lt; / RTI >

3 is a flowchart of a load balancing system according to an embodiment of the present invention.

Referring to FIG. 3, the DLP server 110 periodically generates DLP server information, and may transmit the generated information to the load balancing server 120. At this time, the DLP server 110 may include a plurality of DLP server information, and the DLP server information may include a CPU, memory, and network traffic.

When receiving the DLP server information from the DLP server 110, the load distribution server 120 may generate the DLP server usage ranking information based on the DLP server information. At this time, generating the DLP server usage ranking information based on the DLP server information calculates the resource usage based on the CPU, memory, and network traffic of the DLP server information and determines the DLP server usage ranking information according to the calculated resource usage Lt; / RTI >

At this time, the load balancing server 120 can receive the DLP server use request signal delivered by the client 10. Upon receiving the DLP server use request signal, the load balancing server 120 generates data flow information based on the DLP server usage ranking information To the controller (130). At this time, the DLP server use request signal may include a necessary resource usage amount required for processing the data of the client 10, and generating the data flow information may be such that the required resource usage required for processing the data of the client 10 is the minimum usage amount May be to generate data flow information that causes the unaccepted data to be distributed to the next-ranked DLP server if the DLP server with the available resources exceeds the available resource usage.

The controller 130 can receive the data flow information from the load balancing server 120, generate the data flow table according to the data flow information, and transmit the generated data flow table to the switch 140.

The switch 140 can receive the data flow table from the controller 13 and distribute the data of the client 10 to the DLP server 110 according to the received data flow table.

4 is a flowchart of a method of controlling a load distribution system according to an embodiment of the present invention.

A control method of the load distribution system according to an embodiment of the present invention will be described with reference to FIG.

First, the load balancing server 120 periodically receives DLP server information from the DLP server 110. (310) The load balancing server 120 receives the DLP server information from the DLP server 110, (320). At this time, the resource usage can be calculated using Equation (1) described above.

On the other hand, the load distribution server 120 generates the DLP server usage ranking information based on the calculated resource usage amount, and when receiving the DLP server use request signal from the client (330), the DLP server usage ranking information (340) The data flow information is generated based on the resource usage information of the client 10. At this time, the data flow information is generated based on the resource usage amount required for processing the data of the client 10, It may be possible to generate data flow information for distributing unaccepted data to the next-ranked DLP server.

Meanwhile, the controller 130 can receive data flow information generated by the load distribution server 120 from the load distribution server 120, generate a data flow table based on the received data flow information, And transmit the flow table to the switch 140. (360)

The switch 140 receives the data flow table from the controller 130 and distributes the data of the client to the DLP server according to the received data flow table.

Such a load balancing system and its control method may be implemented in the form of program instructions that can be executed through various computer components and recorded on a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination.

The program instructions recorded on the computer-readable recording medium may be ones that are specially designed and configured for the present invention and are known and available to those skilled in the art of computer software.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules for performing the processing according to the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

10: Client
100: load balancing system
110: DLP server
120: load balancing server
130: controller
140: Switch

Claims (11)

A DLP server for generating DLP server information;
A load balancing server for receiving DLP server information from the DLP server and receiving DLP server request signals from a client to generate data flow information based on the received DLP server information;
A controller receiving the data flow information from the load distribution server and generating a data flow table based on the received data flow information; And
And a switch for receiving the data flow table from the controller and distributing data of the client to the DLP server according to the received data flow table,
The load balancing server calculates resource usage of each DLP server based on the DLP server information, generates DLP server usage ranking information based on the resource usage amount, and based on the generated DLP server usage ranking information, Lt; / RTI >
Wherein the DLP server request signal includes necessary resource usage information necessary for processing data of the client,
The generating of the data flow information based on the generated DLP server usage rank information compares the available resource usage amount of the DLP server of the highest priority among the DLP server usage ranking information with the necessary resource usage information necessary for processing the data of the client All of the data of the client is transmitted to the DLP server of the highest priority if the required resource usage is smaller than the available resource and if the required resource usage is larger than the available resource, And generates the data flow information for distributing the amount of data according to the DLP server usage ranking information.
delete The method according to claim 1,
The resource usage amount may be,
And the amount of memory usage is set to be the highest, based on usage of CPU, memory, and network traffic.
delete The method according to claim 1,
Generating the data flow information comprises:
Distributes the amount of data that the highest priority DLP server can not accommodate to all available DLP servers according to the DLP server usage ranking information, and if the data of the client remains, To be redistributed in accordance with the load distribution system.
The method of claim 3,
Wherein the load balancing server and the DLP server exchange information on the memory usage based on an SNMP protocol, the load balancing server uses a PHP script, and the DLP server uses a shell script.
A computer-readable recording medium storing a computer program for providing a load distribution system according to any one of claims 1, 3, 5, and 6.
A control method of a load balancing system including a plurality of DLP servers, a load balancing server, a controller, and a switch for processing data of a client,
The DLP server generates DLP server information and transmits the DLP server information to the load distribution server,
The load distribution server calculates resource usage of each DLP server based on the DLP server information, generates DLP server usage ranking information based on the calculated resource usage amount, and receives DLP server request signal from the client, Generates data flow information based on the server usage ranking information, and transmits the generated data flow information to the controller,
The controller generates a data flow table based on the data flow information and transmits the data flow table to the switch,
Wherein the switch comprises distributing data of the client to the DLP server according to the data flow table,
Wherein the DLP server request signal includes necessary resource usage information necessary for processing data of the client,
The generating of the data flow information based on the generated DLP server usage rank information compares the available resource usage amount of the DLP server of the highest priority among the DLP server usage ranking information with the necessary resource usage information necessary for processing the data of the client All of the data of the client is transmitted to the DLP server of the highest priority if the required resource usage is smaller than the available resource and if the required resource usage is larger than the available resource, And generates the data flow information for distributing the amount of data according to the DLP server usage ranking information.
9. The method of claim 8,
Wherein the DLP server information includes a usage amount of CPU, memory, and network traffic of the DLP server,
The resource usage of each DLP server is calculated based on the DLP server information,
Wherein the control unit is generated based on usage of CPU, memory, and network traffic, and is set such that the weight of the memory usage is the highest.
delete 9. The method of claim 8,
Generating the data flow information comprises:
Distributes the amount of data that can not be received by the DLP server of the highest priority to all available DLP servers according to the DLP server usage ranking information and if the data of the client remains, In accordance with the control information.
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KR102215031B1 (en) 2020-07-22 2021-02-10 주식회사 데브와이 Method for connecting waiting person in distributed server environment
KR102522910B1 (en) * 2022-12-29 2023-04-18 주식회사 에스티씨랩 System and method for ensuring service continuity of proxy

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Publication number Priority date Publication date Assignee Title
JP2000347962A (en) * 1999-06-02 2000-12-15 Nec Commun Syst Ltd System and method for distributed management of network
US20120233313A1 (en) * 2011-03-11 2012-09-13 Hironobu Fukami Shared scaling server system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000347962A (en) * 1999-06-02 2000-12-15 Nec Commun Syst Ltd System and method for distributed management of network
US20120233313A1 (en) * 2011-03-11 2012-09-13 Hironobu Fukami Shared scaling server system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102215031B1 (en) 2020-07-22 2021-02-10 주식회사 데브와이 Method for connecting waiting person in distributed server environment
KR102522910B1 (en) * 2022-12-29 2023-04-18 주식회사 에스티씨랩 System and method for ensuring service continuity of proxy

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