cisco load balancing router

Keepalived+lvs+nginx High Load Balancing availableThe previous article written the Nginx load balancer, this article realizes the high Availability (HA). The overall design of the system is to use Nginx to do load balancing, if there is an nginx single-machine failure, the w

HAProxy load balancing, 1. HAProxy introduction: HAProxy is a free, efficient, and reliable high-availability and load balancing solution. This software is ideal for processing layer-7 data requests from high-load sites, HAProxy's working mode enables it to be easily and sec

Linux keepalived + LVS implements mysql slave database load balancing and keepalivedlvsPrerequisites: Reference link: Http://www.osyunwei.com/archives/7464.html Ps: the above are the main references for this operation. I am very grateful for the contributions made by the author of this article. The main purpose of my essay is Describes some problems and supplements encountered during the deployment of the a

What is LVSLVS is a shorthand for Linux virtual server, that is, a virtualized server cluster system. LVS is also known as the four-tier routing, which works on the transport layer.Introduction to LVS TechnologyThe LVS cluster uses IP load balancing technology and content-based request distribution technology. The scheduler has a good throughput rate, transfers the request evenly to the different server exe

Alteon is used in the use of dual-machine master and Standby mode of work, the corresponding group network according to different ways are divided into a direct-connected group network, single-arm network of two pairs of networks and triangular transmission network, the following in turn, detailed introduction. 1.1Direct Connect NetworkingThe network topology diagram is as follows: ( Standard Architecture )650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M00/87/07/wKioL1fSB7XDvLC9AAEq9X4j7

http://www.osyunwei.com/archives/7464.html (Learning operation and maintenance Knowledge good station)DescriptionOperating system: CentOS 5.X 64-bitMySQL master server: 192.168.21.126MySQL slave server: 192.168.21.127,192.168.21.128MySQL master-Slave synchronization database is: OSYUNWEIDBPurpose of implementation:Two additional servers (master standby) for MySQL read-from-Library load balancing via lvs+kee

Description Operating system: CentOS 5.X 64-bit MySQL master server: 192.168.21.126 MySQL from server: 192.168.21.127,192.168.21.128 MySQL master-Slave synchronization of the database is: OSYUNWEIDB To achieve the purpose: Add two servers (primary standby) to realize MySQL load balancing from library read operation through lvs+keepalived Arc

ProblemWith the continuous development of computer technology, the performance and reliability of a single computer are more and more high. But in reality there are many applications that are difficult to achieve with a single computer, such as:1. The database server in which the bank stores user data must operate uninterrupted for 24 hours and continue to provide services in the event of a serious hardware failure.2, large Web servers at the peak of the site will have millions of users access a

-based scale-out solution has a lot of good performance and reputation for nginx, and the application request router directly supported by IIS Microsoft on Windows is quite good, in bingocc, you can also directly place an order to order HTTP's elastic support for load balancing. However, the customer's requirements are unlimited. In the past two days, the custome

Nginx's load balancing strategy can be divided into two categories: built-in policies and extension strategies. Built-in policies include weighted polling and IP hashes, which, by default, are compiled into the Nginx kernel, simply by specifying the parameters in the Nginx configuration. There are many extension strategies, such as fair, universal hash, consistent hash, etc., by default not compiled into th

A brief introduction of LVS LVS is the short name of Linux virtual server, the Linux VM, a free software project initiated by Dr. Zhangwensong, and its official site is www.linuxvirtualserver.org. Now that LVS is already part of the Linux standard kernel, Before the Linux2.4 kernel, the use of LVS must be recompiled to support the LVS function module, but from the Linux2.4 kernel, has been completely built in the LVS function modules, no need to make any patches to the kernel, you can directly

to the virtual IP address, also can be called LVS Cluster service IP, in the DR, Tun mode, the packet is returned directly to the user, so, on the director server and on each node of the cluster need to set this address. This IP is typically bound on a loopback address, such as lo:0, on real server, and, similarly, on director server, virtual IP is bound on a true network interface device, such as eth0:0.Each real server can be within the same network segment, it can be a separate network segme

Technology mainly involved '; IP load Balancing: Is the most efficient in the implementation of load balancing technology, including three technologies, Vs/nat Vs/yun, VS/DR including Nat a group of servers to constitute a high-performance, highly available virtual server, the problem exists, network services asymmetri

/arp_ignoreEcho 2 >/proc/sys/net/ipv4/conf/all/arp_announce/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up/sbin/route add-host $VIP Dev lo:0;;Stop# Stop LVS-DR Real Server loopback device (s)./sbin/ifconfig lo:0 Downecho 0 >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho 0 >/proc/sys/net/ipv4/conf/lo/arp_announceecho 0 >/proc/sys/net/ipv4/conf/all/arp_ignoreecho 0 >/proc/sys/net/ipv4/conf/all/arp_announce;;Status# Status of Lvs-dr Real server.Islothere= '/sbin/ifconfig lo:0 | grep $

subnet problem Through these articles, including this blog, you have learned the functions, principles, features and working modes of Nginx and LVS respectively. In the following article, we will combine these load layer technologies to introduce the installation and configuration of Nginx + keepalived, LVs + keepalived, LVs + keepalived + nginx.(I this Month "Perseverance" award has been received, laugh one: haha ha) Copyright NOTICE: This arti

restart 查看lvs-master日志：在浏览器里面访问 http://192.168.2.218/ 即可！当你宕掉lvs-master后，lvs-backup会接管变成lvs-master提供服务，当lvs-master故障恢复后，lvs-backup又会变成原来的状态！4. Practical advice-brain fissure为了解决脑裂问题，需要把主MASTER和备BACKUP各自的keepalived.conf配置文件里面的state 状态都改成BACKUP，优先级分别设置100和90。我们常听说脑裂问题，到底什么是脑裂问题呢？在集群配置中的split-brain现象是指，主从之间互相检测不到心跳，同时抢占资源，导致服务无法正常访问的情况。所以我们还需要在主备keepalived.conf添加nopreempt 指令！Attached realserver.sh script file: Excerpt from (Wu Guangko teacher about lvs+keepalived High Availability