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High-Availability Implementation mdash; LVS (LinuxVirtualServer) LinuxVirtualServer several terms: ctor: also known as the scheduler, LVS front-end device; realserver: also known as the real internal server, is actually providing services; VIP: The published IP address, that is, the customer... high availability-Linux Virtual Server (LVS) Linux Virtual Server terms: ctor: also known as a scheduler, LVS front-end device; realserver: also known as a re

scheduling algorithmLoad balancing technology has many implementations, there are methods based on DNS domain name rotation, a method based on client scheduling access, a scheduling method based on application layer system load, and a scheduling method based on IP address, in which the most efficient implementation is IP load balancing technology.The IP load balancing technology of LVS is realized by Ipvs module, Ipvs is the core software of LVS cluster system, its main function is: Install on

by the user's request, the address of the real server which is converted to the backend service by the LVS server and the user's request message is sent to the application server. While the application server opens the message and responds to the user request to send and pass the LVS server, the LVS server modifies the source address to the VIP address on the LVS server interface.Nat Mode Features: 123456789 用户发来的请求和响应，都必须经过LVS服务

) (active+1) *256/weight who's small, pick whoIv. nq:never Queue (based on SED, regardless of incative)V. LBLC (locality-based Least-connection) based on local minimum connectionsVi. LBLCR: Local-based minimum connection with replication (cache shared object, sibling server)Dispatch to the same server as much as possible, only new requests are sent to the fewest servers, no words will be queried for the sibling server 5.LVS Dr ModelPrinciple of Dr Model When a client accesses a service in the

Linux Virtual Server several terms:Director: Also can be called dispatcher, LVS front-end equipment; Realserver: Also known as the real internal server, is really in the provision of services; VIP: External IP, that is, the client requests to come in IP address; DIP: Address of communication between dispatcher and Realserver; Introduction to LVS working modeLVS to achieve server cluster load balancing There are three ways, NAT,DR and Tun, the follow

Tags: des blog http using OS IO file data1) Check the status of the cluster:[Email protected] ~]$ crsctl Check clusterCrs-4537:cluster Ready Services are onlineCrs-4529:cluster Synchronization Services is onlineCrs-4533:event Manager is online2), all Oracle instances-(Database status):[Email protected] ~]$ srvctl status database-d racdbInstance RACDB1 is running on node RAC01Instance RACDB2 is running on node RAC023), check the status of individual instances:[Email protected] ~]$ srvctl status i

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Directory: LVS three-mode configuration Comparison of advantages and disadvantages of LVS three working modes LVS three-mode configuration Brief configuration of LVS three (LVS-DR, LVS-NAT, LVS-TUN) Modes What is LVS: Http://www.linuxvirtualserver.org/VS-NAT.html Http://www.linuxvirtualserver.org/VS-IPTunneling.html Http://www.linuxvirtualserver.org/VS-DRouting.html First, install ipvsadm management.Program Download: http://www.linuxvirtualserver.org/software/ Note that the

this operation will certainly affect the use of business systems, can not meet the requirements of the online architecture system. A better solution is to introduce a virtual IP (VIP) to the current replication environment, with the VIP to switch, so the impact of online switching will be much smaller. Suppose we apply for the VIP is: 192.168.1.20 Then we'll tie

High Availability-Linux Virtual Server (LVS) Linux Virtual Server terms: ctor: Also known as a scheduler, LVS front-end device; realserver: Also known as a real internal Server, is actually providing services; VIP: The published IP address, that is, the IP Address requested by the customer; DIP: the address for communication between the scheduler and the realserver; LVS working mode introduction LVS Server Cluster load balancing has three ways, NAT, D

exists.[Email protected] ~]# Lsmod|grep Ip_vsIp_vs 122112 04.3 Configurationand verifying the director Server4.3.1 Configuring the Director Server #!/bin/bash vip=192.168.98.77 #虚拟ip (IP for user access) rip1=192.168.98.74 # Real server IP rip2=192.168.98.117 #真实服务器 (real server) IP port=2200 #端口 Case "$" in Start) echo "start config LVS Director Server ..." ifconfig eth0:0 $VIP