dr m160

VS/DR: That is, Virtual Server via Direct RoutingThat is, using direct routing technology to implement virtual server. Its connection scheduling and management is the same as in Vs/nat and Vs/tun, but its message forwarding method is different, vs/dr by overwriting the request message MAC address, send the request to real server, and real server will respond directly back to the customer, eliminates the vs/

At the end of 2012, Amoy Doll Design competition to start again, the Contest Amoy Doll invited to Hong Kong well-known play company TOY2R jointly organized, the contestants also from a single Amoy doll into the Amoy Qee. Prior to the opening of the competition, Dr. Chai Hancheng, founder of Hong Kong TOY2R, was also invited to the mainland and held three lectures in the three days of November, 21 and 23rd at the China Academy of Fine Arts, the Beijing

The DR Mode of LVs is explained in detail First, the environment introduction Three virtual machines to do LVS load balancing experiment, VM01 is load balancer, only one network card, VM02 and vm03 are real Web server VM01 eth0:192.168.46.131 vip:192.168.46.200 vm02 eth1:192.168.46.130 vm03 : 192.168.46.134 Second, the work principle of LVS's Dr mode The official principle explains: Director receives

transparent to the user, and the user sees only one virtual server as LB, but not the RS group that provides the service. Three: LVS's working mode has three kinds: 1.nat (Lvs-nat) A. Cluster contacts must be in the same subnet as lb (i.e. dip and) and not across domain segments B.rip is a private address C. All RIP gateways must point to dip D. The scheduler handles all requests E. Port address Translation F. Because it's NAT. H. Single-point bottlenecks 2. Direct Routing (LVS-

Brief introduction The moderately sized enhanced log file system (JFS2) Inode cache is critical to achieving the high performance and stability of the IBM AIX system. Typically, the user will control the maximum memory usage of the inode cache by tuning j2_inodecachesize. The inode cache size can also be changed through a dynamic memory reconfiguration (DR) operation. In Aix 6.1 (over 6100-04) and AIX 7.1, there is a hidden side effect that, after pe

Control DR election of OSPFApplication EnvironmentIn the Broadcast Network and NBMA network, the route changes of any vro will lead to multiple transfers, wasting bandwidth resources. To solve this problem, OSPF defines the election Router DR (Designated Router) and BDR (Backup Designated Router ).All routers send Router-LSA, but only DR, BDR, and

OSPF is an Open Shortest Path priority protocol. It is one of the gateway protocols used within the autonomous region and is developed based on the link status. Ospf has five network types: 1. Point-to-point type, proposed by Cisco, automatically discovers neighbors and does not elect DR/BDR. The hello Message release time is 10 s. 2. Broadcast type: the network type proposed by Cisco, which automatically discovers neighbors and selects

1. explore the election process 1.1 experiment topology 1.2 experiment requirements (1) configure the basic IP address based on the topology (2) Capture packets on the shared link and pay attention to the Hello message during OSPF neighbor relationship establishment (3) debug the OSPF joining relationship on R1, R2, R3, and R4 (4) sequentially declare the direct connection network of R1, R2, R3, and R4 to the OSPF process (5) observe the experimental phenomenon and analyze1.3 Experiment step (1)

Author: Tang Xiaoye, Zhang Li, Chen Zhiqiang, Gao hewei, and Zhang Guowei 【Abstract]This article introducesComputingThe dual-energy fluoroscopy (DR) Material Recognition Algorithm for tomography (CT). This algorithm is based on the single-energy CT reconstruction image, through Segmentation of CT images and extraction of geometric information of the fault, effective atomic ordinal number andElectronicsDensity Distribution. The CT imaging system com

limited back node equipment downtime will not affect the businessThree About LVSLvs:linux virtual server abbreviation, meaning is a virtual servers cluster system, it is also an open source software, by the University of Defense technology, Dr. Zhangwensong founded in May 1998, is one of the earliest free software projects in China, it can realize simple load balancing under Linux platform, with low cost, high performance, high reliability and high a

Address: http://www.cnblogs.com/czh-liyu/archive/2011/11/29/2267963.html For convenience, I made another diagram based on the official schematic diagram, as shown in: VS/DR architecture: I will explain the principle of LVS-DR based on this schematic diagram and specific examples, including the data packet, data frame direction and conversion process. Official principles: ctor receives user requests, select

Model Design reason: GPS provides global, around-the-clock, and real-time navigation Advantages. However, when satellite signals such as high-rise buildings, Boulevard, overpasses, and culvert tunnels are "blind spots, GPS cannot provide users with precise navigation information, especially continuous navigation information. Dr (dead-reckoning) uses a direction sensor (Gyroscope) and a speed sensor (mileage meter) to estimate the instantaneous locatio

#ifconfigeth1|grep‘inetaddr‘inetaddr:10.0.0.10Bcast:10.255.255.255Mask:255.0.0.0 2 IP address division for Web hosts. #ifconfigeth0|grep‘inetaddr‘inetaddr:172.16.32.12Bcast:172.16.255.255Mask:255.255.0.0#ifconfigeth1|grep‘inetaddr‘inetaddr:10.0.0.11Bcast:10.255.255.255Mask:255.0.0.0 During the test, the eth0 Nic of the web host can be down. This is easy to configure. Test whether the Web node can be accessed normally on the LVS host. #curlhttp://10.0.0.10 Enable kernel forwarding #echo1>/pro

balancing algorithm, and sends the MAC address of the network card of the RIP as the destination MAC address to the LAN. At this point the IP header and data frame header information are as follows:650) this.width=650; "class=" Fit-image "border=" 0 "src=" http://images.51cto.com/files/uploadimg/20110823/ 183324832.jpg "width=" 498 "/>③realserver (192.168.57.122) received this frame in the local area network, and the target IP (VIP) was found to match with local, so the message was processed. T

Http://blog.chinaunix.net/uid-7411781-id-3436142.htmlA public network address deployment LVS/DR mode online read a lot about LVS, in the selection of 2 modes lvs/dr and Lvs/nat, see a lot of people's view that the DR model must use multiple public address, both Dip,vip,rip must be in the same network segment At first my idea was the same, the only solution I knew

First, Dr can be roughly divided into two types of flat DR and CCD-DR (of course there are other types such as multi-wire proportional chamber detector, ignored here ). Compared with flat-panel DR, CCD-DR has many advantages: 1. mature technology, the whole machine is chea

based on Build LAMP environment, and practice based on DNS do a domain-based virtual hosting environment and re-establish the same environmental requirements:a) Implement Web automatic synchronization of service file updates to another machineb) Database Implementation Master-slave replicationc) through Shell script to implement site source code backup and MySQL Backup , backup strategy includes full-volume, incremental, differential backupload Balancing through LVS requires the use of

Schema deploymentLvs/keepalived (Master): 192.168.21.3 lvs/keepalived (Slave): 192.168.21.6 nginx1:192.168.21.4 nginx2:192.168.21.5 VIP : 192.168.21.101, installing Ipvsadm, keepalived (Master/slave)yum-y Install keepalived ipvsadm2. Modify the keepalived.conf fileLvs_masterCd/etc/keepalived vi/deepalived! Configuration File for KeepalivedGlobal_defs {router_id master_201}Vrrp_instance Vi_1 {State MASTERInterface eth0VIRTUAL_ROUTER_ID 100Priority 151Advert_int 1Authentication {Auth_type PASSAuth

in the in OSPF, there are two fairly important concepts:DR and BDR. Let 's take a look at what DR is, what's called BDR, and then see what they do. DR:designatedrouter Specifies the router. BDR:backupdesignated Router backup the specified router. in a LAN connection, ospf Bdr all the other and dr bdr connected routers form a fully contiguous state and only transmit LSA ( link status advertisement )

Detailed description of the dr mode of lvs I. Environment Introduction Three virtual machines are used for lvs Server Load balancer experiments. vm01 is a server Load balancer with only one Nic. vm02 and vm03 are real web servers. vm01eth0:192.168.46.131vip:192.168.46.200vm02eth1:192.168.46.130vm03eth1:192.168.46.134 IIHow the lvs dr mode works Official principles: ctor receives user requests, selects a re