大流量WEB架构-LVS集群配置

 主题:ubuntu8.04下安装配置lvs-dr
    一.环境
    lvs-dr
    eth0    192.168.1.50
    eth0:1    192.168.1.55(VIP)
    web1
    eth0    192.168.1.51
    lo:0    192.168.1.55(VIP)
    web2
    eth0    192.168.1.52
    lo:0    192.168.1.55(VIP)
    注:所有真实IP必须在同一网段,VIP可以用其他网段
    二.lvs-dr配置
    1)检查内核是否支持ipvs
    modprobe -l | grep “ipvs”
    2)安装ipvsadm
    apt-get install ipvsadm
    3)启用ip转发
    vi /etc/sysctl.conf
    net.ipv4.ip_forward = 1
    4)配置脚本
    vi bin/lvs-dr.sh
    #!/bin/bash
    #description:start lvs_server
    #set lvs
    /sbin/ipvsadm -C
    /sbin/ipvsadm -A -t 192.168.1.55:80 -s rr
    /sbin/ipvsadm -a -t 192.168.1.55:80 -r 192.168.1.51:80 -g -w 1
    /sbin/ipvsadm -a -t 192.168.1.55:80 -r 192.168.1.52:80 -g -w 1
    /etc/init.d/ipvsadm save
    三.WEB配置
    1)配置脚本
    vi bin/lvs-web.sh
    #!/bin/bash
    #Description : RealServer Start!
    #Write by:hugwww
    #Last Modefiy:2009.1.24
    VIP=192.168.1.55
    /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
    /sbin/route add -host $VIP dev lo:0
    echo “1″ >/proc/sys/net/ipv4/conf/lo/arp_ignore
    echo “2″ >/proc/sys/net/ipv4/conf/lo/arp_announce
    echo “1″ >/proc/sys/net/ipv4/conf/all/arp_ignore
    echo “2″ >/proc/sys/net/ipv4/conf/all/arp_announce
    sysctl -p
    #end
    IPVS已实现了以下十种调度算法:
    * 轮叫调度(Round-Robin Scheduling)
    * 加权轮叫调度(Weighted Round-Robin Scheduling)
    * 最小连接调度(Least-Connection Scheduling)
    * 加权最小连接调度(Weighted Least-Connection Scheduling)
    * 基于局部性的最少链接(Locality-Based Least Connections Scheduling)
    * 带复制的基于局部性最少链接(Locality-Based Least Connections with Replication Scheduling)
    * 目标地址散列调度(Destination Hashing Scheduling)
    * 源地址散列调度(Source Hashing Scheduling)
    * 最短预期延时调度(Shortest Expected Delay Scheduling)
    * 不排队调度(Never Queue Scheduling)
    注:WEB服务器可以是windows 2003,windows 2008,win7,linux,freeBSD,UNIX等

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