CN103944745A - Computer disaster recovery method and system - Google Patents
Computer disaster recovery method and system Download PDFInfo
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- CN103944745A CN103944745A CN201310022700.6A CN201310022700A CN103944745A CN 103944745 A CN103944745 A CN 103944745A CN 201310022700 A CN201310022700 A CN 201310022700A CN 103944745 A CN103944745 A CN 103944745A
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Abstract
The invention is suitable for the field of computer disaster recovery, and provides a computer disaster recovery method and system. The method includes the following steps: when a fault of a main server is detected in a heartbeat detection process, a fault message of the main server is sent to a packet capturing process; the packet capturing process sets a packet capturing environment; when a user process sends a first network packet to the main server, a packet filter captures the first network packet that is routed to a loopback interface and uploads the first network packet to the packet capturing process; and the first network packet received by the packet capturing process is processed into a second network packet, and the second network packet is sent to a standby server. According to the computer disaster recovery method in the invention, usability and practicability of the disaster recovery method are greatly enhanced, at the same time, deployment is flexible, and the purpose of disaster recovery is realized.
Description
Technical field
The invention belongs to computer disaster tolerance field, relate in particular to a kind of computer disaster recovery method and system.
Background technology
Computer disaster tolerance system is the environment that can deal with various disasters.When computer system is in the time suffering the human-made disasters such as natural disaster as irresistible in fire, floods, earthquake, war etc. and computer crime, computer virus, power down, network/communication failure, hardware/software mistake and manual operation mistake, disaster tolerance system will ensure the fail safe of user data, also claim data disaster tolerance, an or more perfect disaster tolerance system, continual application service can also be provided, also claim application disaster tolerance.No matter which plants disaster tolerance system type is all before disaster recovery, maintain the important means of the normal operation of system.
Existing computer disaster recovery method has following two kinds:
One is, general disaster recovery method, and as shown in Figure 1, sender server need to be carried out disaster tolerance to User Datagram Protoco (UDP) (User Datagram Protocol, the UDP) message that mails to primary server.The disaster tolerance module of the consumer process in sender server detects the upstate of standby server and primary server by heartbeat message (HeartBeat, HB).In the time that primary server is available, consumer process sends UDP message to the primary server of recipient; In the time of primary server failure, consumer process, by the destination address of change UDP bag, sends to standby server UDP message.So can reach the object that forwards disaster tolerance.
Another kind is, the disaster recovery method of address transition Network Based (Network Address Translation, NAT), and as shown in Figure 2, sender server need to be carried out disaster tolerance to the UDP message that mails to primary server.Disaster tolerance process in sender server is responsible for detecting by heartbeat message the upstate of standby server and primary server.In the time that primary server is available, consumer process sends UDP message to the primary server of recipient; In the time of primary server failure, the configuration of the NAT module of disaster tolerance process amendment system kernel, the UDP that configuration is primary server by object IP address guarantees the repair free of charge and changes object IP address into is standby server, and UDP message is sent to standby server.So can reach the object that forwards disaster tolerance.
These two kinds of disaster recovery methods, the former first shortcoming is versatility deficiency, disaster tolerance module is embedded in consumer process, causes the consumer process that need to realize this type of disaster tolerance all will comprise above-mentioned disaster tolerance module, or need to again develop; Second shortcoming is very flexible, and consumer process and disaster tolerance module are too coupled, if recipient's server address changes, needs to revise the relevant configuration of consumer process, larger on consumer process impact.The latter's shortcoming is too to depend on system kernel to provide nat feature, and generally, nat feature is for servers such as gateway, agencies, and the service server of common machine room does not generally provide nat feature.In this case, a kind of rear method cannot be applied, and the scope of application is not extensive.
In sum, computer disaster tolerance system needs a kind of flexible, general and scope of application disaster recovery method widely.
Summary of the invention
The embodiment of the present invention provides a kind of computer disaster recovery method and system, is intended to solve existing disaster recovery method, not problem widely of versatility deficiency, very flexible or the scope of application.
On the one hand, provide a kind of computer disaster recovery method, described method comprises:
Heartbeat detection process, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process;
Described packet capturing process arranges packet capturing environment;
In the time that consumer process sends first network bag to described primary server, grouping IP filter is caught and is routed to the described first network bag of loopback interface and upload described first network bag to described packet capturing process;
The described first network bag receiving is processed into second network bag by described packet capturing process, and described second network bag is sent to standby server.
On the other hand, provide a kind of computer disaster tolerance system, described system comprises:
Fault acquiring unit, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process;
Packet capturing setting unit, for arranging packet capturing environment;
Network packet capturing unit, in the time that consumer process sends first network bag to described primary server, catches and routes to the described first network bag of loopback interface and upload described first network bag to described packet capturing process;
Network packet retransmission unit, for the described first network bag receiving is processed into second network bag, and is sent to standby server by described second network bag.
In the embodiment of the present invention, heartbeat detection process, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process; Described packet capturing process arranges packet capturing environment; In the time that consumer process sends first network bag to described primary server, grouping IP filter is caught and is routed to the described first network bag of loopback interface and upload described first network bag to described packet capturing process; The described first network bag receiving is processed into second network bag by described packet capturing process, and described second network bag is sent to standby server, the present invention, by changing route, the first networking bag of data link layer is forwarded at local loopback interface, recycling grouping IP filter carries out packet capturing and is sent to application layer, in the method for application layer IP fragmentation and reassembly, transmission network bag, whole process does not rely on the nat feature of system kernel, thereby availability and the practicality of disaster recovery method are greatly strengthened, meanwhile, dispose flexibly.
Brief description of the drawings
Fig. 1 is the schematic diagram of the general disaster recovery method that provides of prior art;
Fig. 2 is the schematic diagram of the disaster recovery method based on NAT that provides of prior art;
Fig. 3 is the schematic diagram of the computer disaster tolerance system that provides of the embodiment of the present invention one;
Fig. 4 is the realization flow figure of the computer disaster recovery method that provides of the embodiment of the present invention two;
Fig. 5 is the realization flow figure of the computer disaster recovery method that provides of the embodiment of the present invention three;
Fig. 6 is the concrete structure block diagram of the computer disaster tolerance system that provides of the embodiment of the present invention four;
Fig. 7 is the concrete structure block diagram of the computer disaster tolerance system that provides of the embodiment of the present invention five.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
In embodiments of the present invention, heartbeat detection process, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process; Described packet capturing process arranges packet capturing environment; In the time that consumer process sends first network bag to described primary server, grouping IP filter is caught and is routed to the described first network bag of loopback interface and upload described first network bag to described packet capturing process; The described first network bag receiving is processed into second network bag by described packet capturing process, and described second network bag is sent to standby server.
Below in conjunction with specific embodiment, realization of the present invention is described in detail:
Embodiment mono-
Fig. 3 shows the schematic diagram of the computer disaster tolerance system that the embodiment of the present invention one provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
As shown in Figure 3, this system comprises sender server A, standby server B and primary server C, and wherein, sender server A communicates by letter by connectionless protocol with primary server C with standby server B respectively, as udp protocol.The heartbeat message that sender server A detects according to heartbeat detection process in real time, obtain the running status of standby server B and primary server C, if can't detect the heartbeat message of standby server B or primary server C in certain hour length, sender server A thinks that it breaks down.Under general primary server C normal operating conditions, the consumer process that sends server A is directly sent to Ethernet interface by the first network bag that sends to primary server C, mutual with primary server C, and standby server B is always in stand-by state.
Wherein, after primary server C breaks down, sender server A is switched to the disaster tolerance process of standby server B, as shown in Figure 3, comprises the following steps:
Step 1, the heartbeat detection process of sender server A, in the time primary server C fault being detected, sends the failure message of described primary server C to packet capturing process;
Step 2, packet capturing process transfer api interface is opened pcap packet capturing library facilities, makes described packet capturing library facilities in the state of intercepting; The filter condition of grouping IP filter is set, filters the first network bag that mails to primary server C; Calling system order, increases dynamic routing, routes to loopback interface lo with the first network bag that consumer process is sent to primary server C.
Step 3, consumer process is indifferent to the fault state of primary server C, still give out a contract for a project to primary server C, but now this IP bag will can not be sent on networking, but be routed to loopback interface.
Step 4, BPF grouping IP filter captures at loopback interface the bag that consumer process sends, and by packet capturing equipment, first network bag is passed to packet capturing process
Step 5, packet capturing process is received the first network bag that grouping IP filter is caught, if first network bag is fragment packets, needs first fragment packets to be recombinated, wherein, regrouping process is with reference to IP agreement; Not fragment packets else if,, directly according to the information of configured in advance, the destination address of first network bag is changed into the IP address of standby server B, call UDP socket and give out a contract for a project to standby server B.
Sender server A realizes disaster tolerance process by above-mentioned 5 steps.
In addition, if sender server A detects the heartbeat message of primary server C again, dynamic routing described in described packet capturing process-kill, closes described packet capturing library facilities, cancel and intercept described first network bag, but directly transfer to primary server C by Ethernet interface.Realize disaster recovery.
Embodiment bis-
Fig. 4 shows the realization flow of the computer disaster recovery method that the embodiment of the present invention two provides, and is suitable for primary server failure, and sender server is switched under the disaster tolerance scene of standby server, and details are as follows:
In step S401, heartbeat detection process, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process.
In the present embodiment, under sender server normal operating condition, detect in real time the heartbeat of primary server and standby server, to know the running status of above-mentioned two kinds of servers, in the time that any one primary server or standby server break down, sender server can't detect the heartbeat of primary server or standby server in Preset Time, sender server thinks that primary server or standby server break down, in the time that sender server detects the heartbeating recovery of primary server or standby server, sender server is thought the Failure elimination of primary server or standby server.The heartbeat detection process of sender server, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process.
In step S402, described packet capturing process arranges packet capturing environment.
In the present embodiment, described packet capturing library facilities is based on grouping IP filter (BSD Packet Filter, BPF) a set of software driver of realizing, in the time primary server failure being detected, heartbeat detection process sender server according to described failure message to packet capturing process, described packet capturing process arranges packet capturing environment, specifically comprises step:
Step 11, described packet capturing process transfer api interface is opened packet capturing library facilities, makes described packet capturing library facilities in the state of intercepting;
Concrete, application programming interface (Application Programming Interface under packet capturing process transfer unix/linux platform, API) application programming interface in storehouse, open pcap packet capturing library facilities, make described packet capturing library facilities in the state of intercepting, wherein, packet capturing library facilities is a part for packet capturing process.
Step 12, described packet capturing process arranges the filter condition of grouping IP filter;
Concrete, if the IP of sender server is 1.1.1.1, the IP of primary server is 3.3.3.3, the filter condition that packet capturing process transfer pcap_setflter arranges BPF grouping IP filter is " udp and src host1.1.1.1and dst host3.3.3.3-ilo ", and its method to set up is consistent with tcpdump instrument conventional under linux.
Step 13, described packet capturing process transfer system command, increases dynamic routing, so that first network bag is routed to loopback interface.
Concrete, after the packet capturing process of sender server is opened packet capturing library facilities, calling system order " root add host3.3.3.3gw127.0.0.1dyn " increases dynamic routing, increase a bar route, original primary server object IP3.3.3.3 is revised as to local IP127.0.0.1, so that first network bag is routed to loopback interface (Loopback, lo), described first network bag is the network packet that consumer process mails to primary server.
In step S403, in the time that consumer process sends first network bag to described primary server, grouping IP filter is caught and is routed to the described first network bag of loopback interface and upload described first network bag to described packet capturing process.
In the present embodiment, the consumer process of sender server is indifferent to fault state, still send first network bag to primary server, but now this first network bag will can not be sent on networking, but be routed to the loopback interface of sender server, divide into groups IP filter on described loopback interface, the described first network bag of capture-data link layer, packet capturing library facilities is uploaded the described packet capturing process of described first network bag to application layer by buffering area.
In step S404, the described first network bag receiving is processed into second network bag by described packet capturing process, and described second network bag is sent to standby server.
In the present embodiment, the packet capturing process of sender server is according to presupposed information, described presupposed information comprises the IP address 2.2.2.2 of standby server, the IP address 3.3.3.3 of described first network bag is revised as to the IP address 2.2.2.2 of standby server, invoke user datagram protocol UDP socket, generate described second network bag, send described second network bag to described standby server, realized the disaster tolerance process to standby server by primary Server switching.
Preferably, before this step S404, if described first network bag is fragment packets, described packet capturing process is recombinated to described first network bag.If described first network bag is not fragment packets, directly carry out this step S404.
The present embodiment, can reach by changing route, the first networking bag of data link layer is forwarded at local loopback interface, recycling packet capturing library facilities carries out packet capturing and is sent to application layer, and in the method for application layer IP fragmentation and reassembly, transmission network bag, whole process does not rely on the nat feature of system kernel, thereby availability and the practicality of disaster recovery method are greatly strengthened,, dispose flexibly meanwhile, be suitable for the application scenarios of various middle-size and small-size servers.
Embodiment tri-
Fig. 5 shows the realization flow of the computer disaster recovery method that the embodiment of the present invention three provides, and details are as follows:
In step S501, heartbeat detection process, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process;
In step S502, described packet capturing process arranges packet capturing environment;
In step S503, in the time that consumer process sends first network bag to described primary server, grouping IP filter is caught and is routed to the described first network bag of loopback interface and upload described first network bag to described packet capturing process;
In step S504, the described first network bag receiving is processed into second network bag by described packet capturing process, and described second network bag is sent to standby server.
It should be noted that, the present embodiment has also comprised when sender server detects the heartbeating recovery of primary server, the disaster-tolerant recovery flow process of sender server.Wherein, the implementation of the step S101 ~ S104 in the execution of step S501 ~ S504 and above-described embodiment one is similar, and details are referring to the description of above-described embodiment one.
In step S505, in the time getting the fault recovery message that heartbeat detection process sends, dynamic routing described in described packet capturing process-kill.
In the present embodiment, in the time that packet capturing process gets the fault recovery message of heartbeat detection process transmission again, sender server thinks that primary server failure eliminates, need to be switched to primary server, dynamic routing described in packet capturing process-kill, first network bag be not routed on loopback interface, directly first network bag is being issued to primary server.
In step S506, packet capturing process is closed described packet capturing library facilities, cancels and intercepts described first network bag.
In the present embodiment, due to packet capturing process meeting consume system resources, therefore, after the fault recovery of primary server, need to close described packet capturing library facilities, cancel and intercept described first network bag, exit packet capturing circulation, continue to detect the heartbeat of primary server and standby server, wait for malfunction next time.The present embodiment, realizes disaster tolerance and disaster recovery automatic seamless and switches.
The present embodiment, can reach sender server according to the fault of primary server and fault recovery situation, flexibly, autonomous seamless switching between primary server and standby server, is suitable for the application scenarios of various middle-size and small-size servers.
Embodiment tetra-
Fig. 6 shows the concrete structure block diagram of the computer disaster tolerance system that the embodiment of the present invention four provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.In the present embodiment, this computer disaster tolerance system comprises: fault acquiring unit 61, packet capturing setting unit 62, network packet capturing unit 63, network packet recomposition unit and network packet retransmission unit 64.
Wherein, fault acquiring unit 61, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process;
Packet capturing setting unit 62, for arranging packet capturing environment;
Network packet capturing unit 63, in the time that consumer process sends first network bag to described primary server, catches and routes to the described first network bag of loopback interface and upload described first network bag to described packet capturing process;
Network packet retransmission unit 64, for the described first network bag receiving is processed into second network bag, and is sent to standby server by described second network bag.
Further, described packet capturing setting unit 62 is opened packet capturing library facilities specifically for described packet capturing process transfer api interface, makes described packet capturing library facilities in the state of intercepting; The filter condition of grouping IP filter is set; Calling system order, increases dynamic routing, routes to loopback interface with the first network bag that consumer process is sent to described primary server.
Further, described computer disaster tolerance system also comprises:
Network packet recomposition unit, if be fragment packets for described first network bag, recombinates to described first network bag.
The computer disaster tolerance system that the embodiment of the present invention provides can be applied in the embodiment of the method two of aforementioned correspondence, and details, referring to the description of above-described embodiment two, do not repeat them here.
Embodiment five
Fig. 7 shows the concrete structure block diagram of the computer disaster tolerance system that the embodiment of the present invention five provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.In the present embodiment, this computer disaster tolerance system comprises: fault acquiring unit 71, packet capturing setting unit 72, network packet capturing unit 73, network packet recomposition unit, network packet retransmission unit 74, route delete cells 75 and packet capturing closing unit 76.
Wherein, fault acquiring unit 71, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process;
Packet capturing setting unit 72, for arranging packet capturing environment;
Network packet capturing unit 73, in the time that consumer process sends first network bag to described primary server, catches and routes to the described first network bag of loopback interface and upload described first network bag to described packet capturing process;
Network packet retransmission unit 74, for the described first network bag receiving is processed into second network bag, and is sent to standby server by described second network bag;
Route delete cells 75, in the time getting the fault recovery message of heartbeat detection process transmission, deletes described dynamic routing;
Packet capturing closing unit 76, for closing described packet capturing library facilities, cancels and intercepts described first network bag.
Further, described packet capturing setting unit 72 is opened packet capturing library facilities specifically for described packet capturing process transfer api interface, makes described packet capturing library facilities in the state of intercepting; The filter condition of grouping IP filter is set; Calling system order, increases dynamic routing, routes to loopback interface with the first network bag that consumer process is sent to described primary server.
Further, described computer disaster tolerance system also comprises:
Network packet recomposition unit, if be fragment packets for described first network bag, recombinates to described first network bag.
The computer disaster tolerance system that the embodiment of the present invention provides can be applied in the embodiment of the method three of aforementioned correspondence, and details, referring to the description of above-described embodiment three, do not repeat them here.
It should be noted that in said system embodiment, included unit is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit also, just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that all or part of step realizing in the various embodiments described above method is can carry out the hardware that instruction is relevant by program to complete, corresponding program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a computer disaster recovery method, is characterized in that, described method comprises:
Heartbeat detection process, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process;
Described packet capturing process arranges packet capturing environment;
In the time that consumer process sends first network bag to described primary server, grouping IP filter is caught and is routed to the described first network bag of loopback interface and upload described first network bag to described packet capturing process;
The described first network bag receiving is processed into second network bag by described packet capturing process, and described second network bag is sent to standby server.
2. the method for claim 1, is characterized in that, described packet capturing process arranges packet capturing environment, is specially:
Described packet capturing process transfer api interface is opened pcap packet capturing library facilities, makes described packet capturing library facilities in the state of intercepting;
Described packet capturing process arranges the filter condition of grouping IP filter;
Described packet capturing process transfer system command, increases dynamic routing, routes to loopback interface with the first network bag that consumer process is sent to described primary server.
3. the method for claim 1, is characterized in that, the described first network bag receiving is processed into second network bag by described packet capturing process, and before described second network bag is sent to standby server, also comprises:
If described first network bag is fragment packets, described packet capturing process is recombinated to described first network bag.
4. the method as described in claim 1,2 or 3, it is characterized in that, in the time that consumer process sends first network bag to described primary server, grouping IP filter is caught and is routed to the described first network bag of loopback interface and upload described first network bag to before or after described packet capturing process, also comprises:
In the time getting the fault recovery message that heartbeat detection process sends, dynamic routing described in described packet capturing process-kill.
5. method as claimed in claim 4, is characterized in that, when described packet capturing process gets the fault recovery message of described heartbeat detection process transmission, after deleting described dynamic routing, also comprises:
Described packet capturing process is closed described packet capturing library facilities, cancels and intercepts described first network bag.
6. a computer disaster tolerance device, is characterized in that, described device comprises:
Fault acquiring unit, in the time primary server failure being detected, sends the failure message of described primary server to packet capturing process;
Packet capturing setting unit, for arranging packet capturing environment;
Network packet capturing unit, in the time that consumer process sends first network bag to described primary server, catches and routes to the described first network bag of loopback interface and upload described first network bag to described packet capturing process;
Network packet retransmission unit, for the described first network bag receiving is processed into second network bag, and is sent to standby server by described second network bag.
7. system as claimed in claim 6, is characterized in that, described packet capturing setting unit is opened packet capturing library facilities specifically for described packet capturing process transfer api interface, makes described packet capturing library facilities in the state of intercepting; The filter condition of grouping IP filter is set; Calling system order, increases dynamic routing, routes to loopback interface with the first network bag that consumer process is sent to described primary server.
8. system as claimed in claim 6, is characterized in that, described system also comprises:
Network packet recomposition unit, if be fragment packets for described first network bag, recombinates to described first network bag.
9. the system as described in claim 6,7 or 8, is characterized in that, described system also comprises:
Route delete cells, in the time getting the fault recovery message of heartbeat detection process transmission, deletes described dynamic routing.
10. system as claimed in claim 9, is characterized in that, described system also comprises:
Packet capturing closing unit, for closing described packet capturing library facilities, cancels and intercepts described first network bag.
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| CN103944745B (en) | 2018-10-02 |
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