CN105007233A - Method for distributing address based on DHCP (dynamic host configuration protocol) server cluster load - Google Patents
Method for distributing address based on DHCP (dynamic host configuration protocol) server cluster load Download PDFInfo
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Abstract
The invention discloses a method for distributing address based on DHCP (dynamic host configuration protocol) server cluster load. The method comprises the following steps: distributing the same address pool to a plurality of DHCP servers; computing average time delay of transmitting address distribution information from each server in the plurality of DHCP servers to other servers; setting a time delay threshold value and grouping the DHCP servers according to the threshold value or artificially appointed DHCP server; selecting the DHCP server with the minimum average time delay from each group as a secondary master server; selecting the server with the minimum average time delay in the secondary master server as a primary master server; if one server in the group cannot transmit the information with the secondary master server, or one server in the secondary master server cannot transmit the information with the current primary master server, starting a corresponding master server selection mechanism. Through the adoption of the method disclosed by the invention, the IP address distribution efficiency is improved, the possibility that the service cannot be provided due to the failure of the server is reduced.
Description
Technical field
The present invention relates to Computer IP address assignment and administrative skill field, specifically, relate to a kind of method based on Dynamic Host Configuration Protocol server cluster load allocation address.
Background technology
Current computer dynamic host configuration standby (Dynamic Host ConfigurationProtocol Failover, be called for short DHCP Failover) in, normally same address pool is distributed to two Dynamic Host Configuration Protocol server, one is master server, and another is time server.These two Dynamic Host Configuration Protocol server assign to nonoverlapping two parts of same address pool, and carry out dynamic assignment by these two Dynamic Host Configuration Protocol server to address.Master server and time server are by synchronizing information so that wherein a station server in the event of a failure, and another station server can be taken over failed server and continue to provide service to client.
Fig. 1 is in the course of the work, and primary and secondary two Dynamic Host Configuration Protocol server exchange the process of the information of renting each other by rental server synchronizing signal.As shown in Figure 1, synchronizing information is divided into: add signal, the information namely sent when server divides and sends a new lease; Update signal, the information namely sent when lease changes (upgrade/expand); Erasure signal, namely works as expiry of tenancy, and address becomes again available, the signal that server sends.When two-server is working properly, between primary and secondary server, have continuous print information flow.In all cases, recipient's server responds with the handshaking signal of positive or negative.These signals only just send to another station server after request DHCP client process.Current rent except information database except safeguarding, two servers are noticed each other mutually, to learn the distribution when replacing and rent.This function is by monitoring that the communication link of two-server fetches realization.
There is following defect in DHCP Failover: DHCP Failover only allows two-server to share an address pool, do not support that multiple servers shares an address pool, if this will cause two-server all to fail, so this two-server will stop externally providing service, thus causes the unavailability of service.Meanwhile, only have two Dynamic Host Configuration Protocol server externally to provide efficiency of service relatively low, when number of users is comparatively huge, the load of every station server is comparatively large, thus affects efficiency and the performance of address assignment.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of method based on Dynamic Host Configuration Protocol server cluster load allocation address, the method comprises:
According to certain ratio or all same address pool is assigned on this multiple stage Dynamic Host Configuration Protocol server.
Calculate each station server in multiple stage Dynamic Host Configuration Protocol server carry out with other Dynamic Host Configuration Protocol server of residue respectively address allocation information synchronous time information transmission time delay, and these time delays to be recorded.
Further, the average delay that in multiple stage Dynamic Host Configuration Protocol server, every station server transmits to other station server address allocation informations is calculated.
Further, divided into groups by these DCHP servers according to average delay threshold value or artificial Dynamic Host Configuration Protocol server of specifying, the Dynamic Host Configuration Protocol server that in the Dynamic Host Configuration Protocol server in each group to this group, the time delay of other Dynamic Host Configuration Protocol server all must not exceed in the threshold value of setting or each group is artificially specified.
Further, in each grouping, according to the average delay of other servers in platform Dynamic Host Configuration Protocol server to this group every in this group, select the minimum Dynamic Host Configuration Protocol server of average delay as secondary master server, here secondary server only explanation for example, grouping can be nested, may there is multistage master server (be master server selection mechanism hereinafter referred to as the method).
Wherein, other Dynamic Host Configuration Protocol server in each grouping except secondary master server, all with secondary master server in a packet carry out the synchronous of address pool assignment information.
Further, in all secondary master Dynamic Host Configuration Protocol server selected, calculate the address allocation information propagation delay time of every platform secondary master server to residue master server.
Further, the mean transit delay of every platform secondary master server to residue master server is calculated.
Further, minimum for average delay is elected as one-level master server in secondary master server, here primary server only explanation for example, being intended to indicate is the high primary server (the method is with master server selection mechanism) of next stage server.
Further, except the one-level master server selected, all secondary master servers all carry out assignment information with the one-level master server selected synchronous.
Further, if have a station server can not carry out information transmission with secondary master server in grouping, then enable master server selection mechanism, in this grouping, the minimum server of average delay in remaining Dynamic Host Configuration Protocol server, can be selected continue externally to provide service, and with one-level master server, to carry out information transmission synchronous, a master server selection mechanism is enabled in every Fixed Time Interval, select current time to continue externally to provide service to the server that other residue server average delays are minimum as secondary master server, if the secondary master server be replaced again recovered after losing efficacy, then carry out real-time data synchronization with current secondary master server, time interval master server selection mechanism to be fixed can rejoin this grouping after refreshing and externally provide service.
Further, if there is a station server can not carry out information transmission with when previous stage master server in secondary master server, then enable master server selection mechanism, in secondary master server, the minimum server of average delay in remaining Dynamic Host Configuration Protocol server, can be selected continue externally to provide service, a master server selection mechanism is enabled in every Fixed Time Interval, select current time to continue externally to provide service to the server that other residue server average delays are minimum as one-level master server, if the one-level master server be replaced again recovered after losing efficacy, then carry out real-time data synchronization with current one-level master server, time interval master server selection mechanism to be fixed can rejoin secondary server cohort after refreshing and externally provide service.
Compared with prior art, a kind of method based on Dynamic Host Configuration Protocol server cluster load allocation address of the present invention, choose master server by progressive, improve IP address assignment efficiency, decrease the generation producing the situation that service cannot be provided because of server failure.
Accompanying drawing explanation
Fig. 1 is the communication synchronization process schematic between prior art DHCP Failover technology two Dynamic Host Configuration Protocol server;
Fig. 2 is the flow chart of a kind of method based on Dynamic Host Configuration Protocol server cluster load allocation address of the present invention;
Fig. 3 is each secondary master server during Fig. 2 illustrates and the information communication synchronizing process schematic diagram between one-level master server;
Fig. 4 is the information communication synchronizing process schematic diagram in the grouping during Fig. 2 illustrates between Dynamic Host Configuration Protocol server and secondary master server;
Fig. 5 illustrate in method of the present invention have a server can not communicate with current master server after be replaced and add the process schematic in group after recovering.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, but not as a limitation of the invention.
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 2 is a kind of flow chart based on Dynamic Host Configuration Protocol server cluster load allocation address method provided by the invention, and the method also can synchronous information of lease, and ensure that address allocation server can be used, as shown in Figure 2, the method step comprises:
Step S201, multiple stage Dynamic Host Configuration Protocol server assign to a part for an address pool.
Particularly, address pool is according to certain ratio or be all assigned on multiple stage Dynamic Host Configuration Protocol server, and the part of the address pool that every station server is assigned to is not overlapping.
Step S202, calculate every platform Dynamic Host Configuration Protocol server to residue Dynamic Host Configuration Protocol server average delay.
Particularly, suppose total N platform Dynamic Host Configuration Protocol server, calculate the time delay that every platform Dynamic Host Configuration Protocol server divides other N-1 platform Dynamic Host Configuration Protocol server be clipped to except oneself, and go out the average delay to residue N-1 platform Dynamic Host Configuration Protocol server according to N-1 the time-delay calculation calculating gained.
Step S203, according to average delay threshold value or artificially Dynamic Host Configuration Protocol server is divided into groups.
Particularly, the threshold value T of an artificial setting time delay, if Dynamic Host Configuration Protocol server is all not more than T to time delay each other, then these Dynamic Host Configuration Protocol server are assigned in a group; Or artificially some Dynamic Host Configuration Protocol server of specifying is assigned in a group.
Step S204, each grouping select the shortest server of average delay as secondary master server.
Concrete, in each group of having divided, the average delay of every station server to residue server is gone out according to the time-delay calculation that the every platform Dynamic Host Configuration Protocol server calculated remains other servers to this group, select average delay the shortest as secondary master server, here secondary server only explanation for example, grouping can be nested, may there is multistage master server (the method is hereinafter referred to as master server selection mechanism).
Step S205, calculate the mean transit delay of every platform secondary master server to residue secondary master server.
Particularly, calculate the time delay to residue secondary master server of every platform secondary master server in all secondary master servers selected, and show that every platform secondary master server is to the average delay remaining secondary master server according to the result calculated.
Step S206, from secondary master server, select the shortest server of average delay as one-level master server.
Particularly, according to every platform secondary master server of gained draw time delay to residue secondary master server, select average delay minimum as one-level master server, here primary server only explanation for example, being intended to indicate is the high primary server (the method is with master server selection mechanism) of next stage server.
If step S207 grouping in have one can not with secondary master server communication, then enable master server selection mechanism, again select secondary master server and externally provide service, after replaced master server recovers, add this group again work on.
If have a station server can not carry out information transmission with secondary master server in grouping, then enable master server selection mechanism, in this grouping, the minimum server of average delay in remaining Dynamic Host Configuration Protocol server, can be selected continue externally to provide service, and with one-level master server, to carry out information transmission synchronous, a master server selection mechanism is enabled in every Fixed Time Interval, select current time to continue externally to provide service to the server that other residue server average delays are minimum as secondary master server, if the secondary master server be replaced again recovered after losing efficacy, then carry out real-time data synchronization with current secondary master server, time interval master server selection mechanism to be fixed can rejoin this grouping after refreshing and externally provide service.
If step S208 secondary master server have one can not with one-level master server communication, then master server selection mechanism, again select one-level master server and externally provide service, after replaced master server recovers, add this group again work on.
If there is a station server can not carry out information transmission with when previous stage master server in secondary master server, then enable master server selection mechanism, in secondary master server, the minimum server of average delay in remaining Dynamic Host Configuration Protocol server, can be selected continue externally to provide service, a master server selection mechanism is enabled in every Fixed Time Interval, select current time to continue externally to provide service to the server that other residue server average delays are minimum as one-level master server, if the one-level master server be replaced again recovered after losing efficacy, then carry out real-time data synchronization with current one-level master server, time interval master server selection mechanism to be fixed can rejoin secondary server cohort after refreshing and externally provide service.
Fig. 3 is information communication synchronizing process schematic diagram when illustrating multiple stage DHCP shared address pond provided by the invention between each secondary master server and one-level master server, as shown in Figure 3, all Dynamic Host Configuration Protocol server according to the size of the delay threshold of time delay and regulation relatively or artificial appointment be divided into some groups, the minimum server of average delay is selected as secondary master server for each group according to average delay, here secondary server only explanation for example, grouping can be nested, may there is multistage master server.Use the same method and select a server as one-level master server from the secondary master server selected, here primary server only explanation for example, being intended to indicate is the high primary server of next stage server, remaining secondary master server respectively with the one-level master server Timing Synchronization lease information selected, thus obtain the copy of lease database each other, lease situation is each other understood in real time.
Fig. 4 is information communication synchronizing process schematic diagram when illustrating that multiple stage Dynamic Host Configuration Protocol server provided by the invention shares an address pool in grouping between Dynamic Host Configuration Protocol server and secondary master server.By divided some groups in, each group of secondary master server having an average delay selected minimum, secondary server only explanation for example here, grouping can be nested, may there is multistage master server.In each group, other Dynamic Host Configuration Protocol server outside removing secondary master server all with the secondary master server Timing Synchronization lease information in this group, thus obtain the copy of lease database each other, lease situation each other understood in real time.
Fig. 5 be illustrate in method provided by the invention be replaced when there being a server can not communicate with current master server and recover after add process schematic in group.As shown in Figure 5, the current server minimum to other server average delays is chosen as master server (this choosing method selects mechanism hereinafter referred to as server).Master server is now server 1, other servers all carry out data syn-chronization with server 1, sometime, suppose server 3 can not with current master server, namely server 1 communicates, then enable and reselect master server machine and in the remaining server of removing server 1, select the minimum server of other server average delays continue service as master server alternative server 1, suppose now to have selected server 4 alternative server 1, then remaining server all carries out data syn-chronization with server 4, as server in Fig. 54 and server 2, server 3, shown in the four-headed arrow of server i etc., master server selection mechanism can be carried out once every the set time, so that upgrading the current server minimum to other server average delays is master server, after replaced master server recovers, after carrying out data syn-chronization with current master server, device selection mechanism timing to be serviced rejoins when upgrading and continues to provide service, shown in Fig. 5, after server selection mechanism upgrades, instantly server i is minimum to the average delay of other servers, so be chosen as master server, other servers (comprising the server after recovery 1) all carry out data syn-chronization with server i.
Compared with prior art, a kind of method based on Dynamic Host Configuration Protocol server cluster load allocation address of the present invention, choose master server by progressive, improve IP address assignment efficiency, decrease the generation producing the situation that service cannot be provided because of server failure
Above-mentioned explanation illustrate and describes some preferred embodiments of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in invention contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the present invention, then all should in the protection range of claims of the present invention.
Claims (8)
1., based on a method for Dynamic Host Configuration Protocol server cluster load allocation address, it is characterized in that comprising the steps:
In proportion or all same address pool is assigned on multiple stage Dynamic Host Configuration Protocol server;
Calculate the average delay that in multiple stage Dynamic Host Configuration Protocol server, every station server transmits to other station server address allocation informations;
Dynamic Host Configuration Protocol server also divides into groups according to threshold value or artificial appointment by setting delay threshold;
Each grouping selects the minimum Dynamic Host Configuration Protocol server of average delay as secondary master server;
In secondary master server, minimum for average delay is selected as one-level master server;
If have a station server can not carry out information transmission with secondary master server in grouping, then enable master server selection mechanism, again select secondary master server and externally provide service, after replaced master server recovers, join this group again work on;
If there is a station server can not carry out information transmission with one-level master server in secondary master server, then enable master server selection mechanism, again select one-level master server and externally provide service, after replaced master server recovers, join this group again work on.
2. as claimed in claim 1 based on the method for Dynamic Host Configuration Protocol server cluster load allocation address, it is characterized in that, when having a station server can not carry out information transmission with secondary master server in grouping, the method of enabling master server selection mechanism comprises further, in this grouping, in remaining Dynamic Host Configuration Protocol server, select the minimum server of average delay continue externally to provide service, and with one-level master server, to carry out information transmission synchronous, a master server selection mechanism is enabled in every Fixed Time Interval, select current time to continue externally to provide service to the server that other residue server average delays are minimum as secondary master server, if the secondary master server be replaced again recovered after losing efficacy, then carry out real-time data synchronization with current secondary master server, time interval master server selection mechanism to be fixed can rejoin this grouping after refreshing and externally provide service.
3. as claimed in claim 1 based on the method for Dynamic Host Configuration Protocol server cluster load allocation address, it is characterized in that, information transmission can not be carried out with when previous stage master server when there being a station server in secondary master server, the method of enabling master server selection mechanism comprises further, in secondary master server, in remaining Dynamic Host Configuration Protocol server, select the minimum server of average delay continue externally to provide service, a master server selection mechanism is enabled in every Fixed Time Interval, select current time to continue externally to provide service to the server that other residue server average delays are minimum as one-level master server, if the one-level master server be replaced again recovered after losing efficacy, then carry out real-time data synchronization with current one-level master server, time interval master server selection mechanism to be fixed can rejoin secondary server cohort after refreshing and externally provide service.
4. as claimed in claim 1 based on the method for Dynamic Host Configuration Protocol server cluster load allocation address, it is characterized in that, the method calculating the average delay that every station server transmits to other station server address allocation informations in multiple stage Dynamic Host Configuration Protocol server comprises, first calculate every platform Dynamic Host Configuration Protocol server respectively with each time delays of other each the Dynamic Host Configuration Protocol server except oneself, then go out the average delay to residue Dynamic Host Configuration Protocol server according to the time-delay calculation calculating gained.
5. as claimed in claim 1 based on the method for Dynamic Host Configuration Protocol server cluster load allocation address, it is characterized in that, the method that same address pool is assigned on multiple stage Dynamic Host Configuration Protocol server is comprised further, address pool is according to certain ratio or be all assigned on multiple stage Dynamic Host Configuration Protocol server, and the part of the address pool that every station server is assigned to is not overlapping.
6. as claimed in claim 1 based on the method for Dynamic Host Configuration Protocol server cluster load allocation address, it is characterized in that, in Dynamic Host Configuration Protocol server in each grouping to this group, the time delay of other Dynamic Host Configuration Protocol server is all no more than the threshold value of this setting, or the DHCP in this grouping is artificially specified.
7. as claimed in claim 1 based on the method for Dynamic Host Configuration Protocol server cluster load allocation address, it is characterized in that, other Dynamic Host Configuration Protocol server in each grouping except secondary master server, all with its secondary master server in a packet to carry out address pool assignment information synchronous.
8. as claimed in claim 1 based on the method for Dynamic Host Configuration Protocol server cluster load allocation address, it is characterized in that, except the one-level master server selected, all secondary master servers all carry out assignment information with the one-level master server selected synchronous.
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