使用LVS Keepalived 实现高性能高可用负载均衡实际操作说明

1、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: 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LVS-DR-MasterLVS-DR-BACKUPLVS-DR-VIPWEB1-Realserver0WEB2-RealserverGateWay系统环境：CentOS 5.2 ，需要安装有gcc openssl-devel kernel-devel包 二.

2、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 /software/kernel-2.6/ipvsadm-1.24.tar.gz#wget /software/keepalived-1.1.15.tar.gz2. 安装LVS和Keepalived#lsmod |grep ip_vs#uname -r2.6.18-92.el5#ln -s /usr/src/kernels

3、/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/

4、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/bashSNS_VIP=case $1 instartifconfig lo:0 $SNS_VIP netmask

5、 55 broadcast $SNS_VIP/sbin/route add -host $SNS_VIP dev lo:0echo 1 /proc/sys/net/ipv4/conf/lo/arp_ignoreecho 2 /proc/sys/net/ipv4/conf/lo/arp_announceecho 1 /proc/sys/net/ipv4/conf/all/arp_ignoreecho 2 /proc/sys/net/ipv4/conf/all/arp_announcesysctl -p /dev/null 2$1echo RealServer Start

6、 OK;stopifconfig lo:0 downroute del $SNS_VIP /dev/null 2&1echo 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_announceecho RealServer Stoped;*echo Usage: $0 start|stopexit 1esace

7、xit 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 keepalivedglobal_defs # notification_email #

8、 acassenfirewall.loc# failoverfirewall.loc# sysadminfirewall.loc# # notification_email_from Alexandre.Cassenfirewall.loc# smtp_server # smtp_connect_timeout 30router_id LVS_DEVEL#2009-08-24 by pricet#VIP1vrrp_instance VI_1 state MASTER #在备用机dr2上配置成BACKUPinterface eth0virtual_router_id 5

9、1priority 100 #在备用机dr1上配置成99advert_int 1authentication auth_type PASSauth_pass 1111virtual_ipaddress virtual_server 80 delay_loop 6lb_algo wrrlb_kind DRpersistence_timeout 50protocol TCPreal_server 80 weight 1TCP_CHECK connect_timeout 3nb_get_retry 3delay_before_re

10、try 3connect_port 80real_server 0 80 weight 3TCP_CHECK connect_timeout 3nb_get_retry 3delay_before_retry 3connect_port 802. 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 lnrootdr1 keepalived-1.1.15# ipvsadmIP Virtual Server version 1.2.1 (size=4096Prot LocalAddress:Port Scheduler Flags- RemoteAddress:Port Forward Weight ActiveConn InActConnTCP 192.168.0