开始安装LVS
1）下载相关软件包
mkdir -p /home/tools/cd /home/tools/wget http://www.linuxvirtualserver.org/software/kernel-26/ipadm-1.26.tar.gz
2）安装LVS命令
lsmod |grep ip_vscat /etc/redhat-releaseuname -rln -s /usr/src/kernels/2.6.18- /usr/src/linux特别注意：1）此ln命令的路径要和uname -r 输出结果内核版本对应。2）如果没有/usr/src/kernels/2.6,是因为缺少kernel-devel-2.6.18软件包。可通过yum install kernel-devel -y 安装。3）ln这个命令也可以不执行，直接指定内核参数编译。tar zxvf ipvsadm-1.26.tar.gzmakemake installlsmod |grep ip_vs提示：1.此时ipvs模块没有被加载，可以执行ipvsadm命令就会吧ip_vs加载到系统内核或执行命令modprobe ip_vs也可以把ip_vs模块加载到内核。然后再执行lsmod -l |grep ip_vs 应该看见ip_vs模块被列出。需要安装依赖包yum install libnl* popt* -y.
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负载均衡器配置
配置别名网卡
ifconfig eth0:1 192.168.1.181 netmask 255.255.255.0 up #<=别名的方式
④ 手工执行配置添加LVS服务器并增加两台RS
ipvsadm -Cipvsadm --set 30 5 60ipvsadm -A -t 192.168.1.181:80 -s wrr -p 20ipvsadm -a -t 192.168.1.181:80 -r 192.168.1.178:80 -g -w 1ipvsadm -a -t 192.168.1.181:80 -r 192.168.1.179:80 -g -w 1
[删除方法]
ipvsadm -D -t 192.168.1.181:80 -s wrripvsadm -d -t 192.168.1.181:80 -r 192.168.1.178:80
[相关参数说明]
ipvsadm -help--clear -C clear the whole table--add-service -A add virtual service with options--tcp-service -t service-address service-address is host[:port]--scheduler -s scheduler one of rr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq--add-server -a add real server with options--real-server -r server-address server-addres s is host(and port)--masquerading -m masquerading (NAT)--gatewaying -g gatewaying(direct routing)(default)--delete-server -d delete real server--persistent -p [timeout] persistent server(会话保持功能）--set tcp tcpfin udp set connection timeout values--weight -w weight capacity of real server提示：更多参数请ipvsadm -help自行查看
⑤命令执行过程及检查配置的执行结果
ipvsadm -Cipvsadm --set 30 5 60ipvsadm -A -t 192.168.1.181:80 -s wrr -p 20ipvsadm -a -t 192.168.1.181:80 -r 192.168.1.178:80 -g -w 1ipvsadm -a -t 192.168.1.181:80 -r 192.168.1.179:80 -g -w 1ipvsadm -L -n --sortipvsadm -d -t 192.168.1.181:80 -r 192.168.1.178:80ipvsadm -L -n --sortipvsadm -a -t 192.168.1.181:80 -r 192.168.1.178:80ipvsadm -L -n --sort
手工在RS端绑定VIP
ifconfig lo:181.168.1.181 netmask 255.255.255.255 uproute add -host 192.168.1.181 dev lo
每个集群节点的回环接口（lo）设备上被绑定VIP地址（其广播地址是其本身，子网掩码255.255.255.255，采取可变掩码方式把网段划分成只含一个主机地址的目的是避免ip地址冲突）允许LVS-DR集群中的集群节点接收发向该VIP地址的数据包，这会有一个非常严重的问题发生，集群内部的真实服务器将尝试回复来自正在请求VIP客户端的ARP广播，这样所有的真实服务器都将声称自己拥有该VIP地址，这时客户端将直接发送请求数据包到真实服务器上，从而破坏DR集群的方法。因此，必须要抑制真实服务器的ARP广播。
手工在RS端抑制ARP响应
⑦抑制ARP响应方法如下：
echo "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_announce
以RS179为例演示执行过程如下：
ifconfig lo:181 192.168.1.181 netmask 255.255.255.255 uproute add -host 192.168.1.181 dev locat /proc/sys/net/ipv4/conf/lo/arp_ignorecat /proc/sys/net/ipv4/conf/all/arp_ignorecat /proc/sys/net/ipv4/conf/all/arp_ignorecat /proc/sys/net/ipv4/conf/lo/arp_announce
echo "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_announce
arp音质技术参数说明
arp_ignore- INTEGER
0 默认值：
检查手工配置成果
使用http://192.168.1.178{179}(181)
使用脚本配置LVS负载均衡服务器端
#!/bin/bash. /etc/init.d/functionsVIP=192.168.1.181SUBNET=eth0:`echo $VIP|cut -d. -f4`PORT=80GW=192.168.1.1#w=3RIP1=( 192.168.1.178 )#w=1RIP2=( 192.168.1.179 )IFCONFIG=/sbin/ifconfigROUTE=/sbin/routeIPVSADM=/sbin/ipvsadmARPING=/sbin/arping#functionsfunction usage (){ local script_name script_name=$1 echo "Usgae : $script_name [ start | stop | restart ]" echo "" return 1}function checkCmd (){ if [ ! -f $1 ]; then echo "Can't find "$1 return 1 fi}function checkSubnet (){ $IFCONFIG |grep "$1"|wc -l}function ipvsStart (){ #judge if $SUBNET is exist. if [ $(checkSubnet $SUBNET) -ne 0 ]; then $IFCONFIG $SUBNET down fi local rs #$IFCONFIG $SUBNET $VIP broadcast $VIP netmask 255.255.255.255 up $IFCONFIG $SUBNET $VIP broadcast $VIP netmask 255.255.255.0 up #$ROUTE add -host $VIP dev $SUBNET $IPVSADM -C $IPVSADM -A -t $VIP:$PORT -s wrr -p 60 for ((i=0; i<`echo ${#RIP1[*]}`; i++)) do $IPVSADM -a -t $VIP:$PORT -r ${RIP1[$i]}:$PORT -g -w 1 done for ((i=0; i<`echo ${#RIP2[*]}`; i++)) do $IPVSADM -a -t $VIP:$PORT -r ${RIP2[$i]}:$PORT -g -w 1 done rs=$? $IPVSADM >/tmp/oldboy.log # update MAC NetIf=$(echo ${SUBNET}|awk -F ":" '{print $1}') $ARPING -c 1 -I ${NetIf} -s $VIP $GW >>/tmp/oldboy.log [ $rs -eq 0 ] && action "Ipvsadm start." /bin/true return $rs}function ipvsStop (){ local rs rs=1 #clean ipvs $IFCONFIG $SUBNET down $IPVSADM -C $IPVSADM -Z rs=$? #$ROUTE del $VIP $ARPING -c 1 -I ${NetIf} -s $VIP $GW >/dev/null 2>&1 [ $rs -eq 0 ] && action "Ipvsadm stoped." /bin/true return $rs}main (){ #judge argv num by oldboy if [ $# -ne 1 ]; then usage $0 fi case "$1" in start) ipvsStart ;; stop) ipvsStop ;; restart) ipvsStop ipvsStart ;; *) usage $0 ;; esac}#start operatingmain $*
开发脚本配置LVS RS真实服务器处理脚本
#!/bin/bash# description: Config realserver lo and apply noarpVIP=( 192.168.1.181 ). /etc/rc.d/init.d/functionscase "$1" instart) for ((i=0; i<`echo ${#VIP[*]}`; i++)) do interface="lo:`echo ${VIP[$i]}|awk -F . '{print $4}'`" /sbin/ifconfig $interface ${VIP[$i]} broadcast ${VIP[$i]} netmask 255.255.255.255 up done 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 action "Start LVS of RearServer.by old1boy" ;;stop) for ((i=0; i<`echo ${#VIP[*]}`; i++)) do interface="lo:`echo ${VIP[$i]}|awk -F . '{print $4}'`" /sbin/ifconfig $interface ${VIP[$i]} broadcast ${VIP[$i]} netmask 255.255.255.255 down done 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 action "Close LVS of RearServer.by old2boy" ;;*) echo "Usage: $0 {start|stop}" exit 1esac
一个脚本同时实现自动剔除和加入RS
CURL方法很不错#!/bin/bash
PORT="80"VIP=192.168.1.181RIP=( 192.168.1.178 192.168.1.179)function check_url(){for ((i=0; i<`echo ${#RIP[*]}`; i++))dojudge=($(curl -I -s http://${RIP[$i]}|head -1|tr "\r" "\n"))if [[ "${judge[1]}" == '200' && "${judge[2]}"=='OK' ]] then if [ `ipvsadm -L -n|grep "${RIP[$i]}"|wc -l` -ne 1 ] then ipvsadm -a -t $VIP:$PORT -r ${RIP[$i]}:$PORT fielse if [ `ipvsadm -L -n|grep "${RIP[$i]}"|wc -l` -eq 1 ] then ipvsadm -d -t $VIP:$PORT -r ${RIP[$i]}:$PORT fifidone}while truedocheck_urlsleep 5done
转载于:https://www.cnblogs.com/sunwubin/p/5379393.html
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