使用LVS+Keepalived 实现高性能高可用负载均衡实际操作说明

kkmangnn

使用LVS+Keepalived 实现高性能高可用负载均衡实际操作说明
kkmangnn            网站:
http://hi.baidu.com/way2rhce

前言：
       本文档用keepalived实现负载均衡和高可用性

一. 网站负载均衡拓朴图
    .
   IP信息列表：
主机名
IP
说明
dr1.example.com
192.168.0.6
LVS-DR-Master
dr2.example.com
192.168.0.7
LVS-DR-BACKUP

192.168.0.8
LVS-DR-VIP
web1.example.com
192.168.0.9
WEB1-Realserver
web2.example.com
192.168.0.10
WEB2-Realserver

192.168.0.1
GateWay

系统环境：CentOS 5.2 ，需要安装有gcc openssl-devel kernel-devel包  

二. 安装LVS和Keepalvied软件包
   1. 下载相关软件包
     #mkdir /usr/local/src/lvs
     #cd /usr/local/src/lvs
     #wget
http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
     #wget
http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
   2. 安装LVS和Keepalived
     #lsmod |grep ip_vs
#uname -r
2.6.18-92.el5
#ln -s /usr/src/kernels/2.6.18-92.el5-i686/ /usr/src/linux

#tar zxvf ipvsadm-1.24.tar.gz
#cd ipvsadm-1.24
#make && make install

#tar zxvf keepalived-1.1.15.tar.gz
#cd keepalived-1.1.15
#./configure  && make && make install
   
       把keepalived做成系统启动服务方便管理

#cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
#cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
#mkdir /etc/keepalived
#cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
#cp /usr/local/sbin/keepalived /usr/sbin/
#service keepalived start|stop     

三． 配置web服务器的脚本.

       #vi /usr/local/src/lvs/web.sh

#!/bin/bash
SNS_VIP=192.168.0.8
case "$1" in
        start)
        ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
        /sbin/route add -host $SNS_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 >/dev/null 2>$1
        echo "RealServer Start OK"

        ;;
        stop)
        ifconfig lo:0 down
        route del $SNS_VIP >/dev/null 2>&1
        echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
        echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
        echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
        echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
        echo "RealServer Stoped"
        ;;
        *)
        echo "Usage: $0 {start|stop}"
                exit 1
        esac
        exit 0  

# chmod +x /usr/local/src/lvs/web.sh   ##修改成可执行

#vi /etc/rc.local                                  ##将该脚本写入开机文件
/usr/local/src/lvs/web.sh start
配置好一台web服务器之后，将配置文件拷贝到第二台服务器。              

四．使用Keepalvied实现负载均衡和和高可用性
  1.配置在主负载均衡服务器上配置keepalived.conf
  #vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
#   notification_email {
#     acassen@firewall.loc
#     failover@firewall.loc
#     sysadmin@firewall.loc
#   }
#   notification_email_from Alexandre.Cassen@firewall.loc
#   smtp_server 192.168.200.1
#   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
#2009-08-24 by pricet
#VIP1
vrrp_instance VI_1 {
    state MASTER              ###在备用机dr2上配置成BACKUP
    interface eth0
    virtual_router_id 51
    priority 100                  ###在备用机dr1上配置成99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.8
    }
}

virtual_server 192.168.0.8 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168.0.9 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.0.10 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
   }
}

2. BACKUP服务器同上配置，先安装lvs再按装keepalived,仍后配置/etc/keepalived/keepalived.conf，只需将红色标示的部分改一下即可.

3. 启动keepalived，查看lvs服务是否正常
  #watch ipvsadm –ln
[root@dr1 keepalived-1.1.15]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.0.8:http wrr persistent 50
  -> 192.168.0.10:http            Route   3      0          0
  -> 192.168.0.9:http             Route   1      0          0
#tail –f /var/log/message  监听日志，查看状态。

5．停Master服务器的keepalived服务，查看BAKCUP服务器是否能正常接管.


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使用LVS+Keepalived 实现高性能高可用负载均衡实际操作说明.rar
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本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u3/96411/showart_2038323.html