lvs DR模式 高可用服务器搭建
环境和集群说明
系统：Centos 6.5
# VIP虚拟IP（向外公开的公网IP）172.20.17.200# Director 服务器（调度器）172.20.17.218172.20.17.219Real 真实服务器（后端服务器）172.20.17.210172.20.17.211Director 服务器配置
安装依赖包：ipvsadm + keepalived
# 依赖包安装yum install popt-static kernel-devel make gcc openssl-devel lftp libnl* popt* -y# 安装lvsln -s /usr/src/kernels/2.6.32-642.1.1.el6.x86_64/ /usr/src/linuxwget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gztar -zxvf ipvsadm-1.26.tar.gzcd ipvsadm-1.26makemake install# 安装Keepalivedwget http://www.keepalived.org/software/keepalived-1.2.21.tar.gzwget http://www.keepalived.org/software/keepalived-1.2.4.tar.gztar zxvf keepalived-1.2.4.tar.gzcd keepalived-1.2.4./configure \--prefix=/usr/local/keepalived \--sysconf=/etc/ \--with-kernet-dir=/usr/src/kernels/2.6.32-642.1.1.el6.x86_64/ \makemake install# 将keepalived做成启动服务，方便管理cp /usr/local/keepalived/sbin/keepalived /usr/sbin/chkconfig --add keepalivedchkconfig --level 2345 keepalived onservice keepalived start | stop# 开启路由转发vim /etc/sysctl.conf net.ipv4.ip_forward = 1sysctl -p编辑配置文件Keepalived.conf
文件路径：/etc/keepalived/keepalived.conf
# 编辑配置文件! Configuration File for keepalivedglobal_defs { # 下面都是邮箱配置 notification_email { 418250505@qq.com 1513942442@qq.com } notification_email_from 418250505@qq.com smtp_server smtp.qq.com smtp_connect_timeout 30 router_id LVS_DEVEL}vrrp_instance VI_1 { state MASTER # 备份服务器上将MASTER改为BACKUP interface eth0 # HA监测网络接口 virtual_router_id 51 # 主、备机的virtual_router_id必须相同 priority 100 # 主、备机取不同的优先级，主机值较大，备份机值较小 advert_int 1 # VRRP Multicast广播周期秒数 authentication { auth_type PASS # VRRP认证方式 auth_pass 1111 # VRRP口令字 } virtual_ipaddress { 172.20.17.200 # 如果有多个VIP，继续换行填写 }}# VIP设置virtual_server 172.20.17.200 80 { delay_loop 6 # 每隔2秒查询realserver状态 # 调度算法（一共10种） # [静态] rr [Round Robin] 轮询调度，权重无意义 # [静态] wrr [Weighted Round Robin] 加权轮询，权重有意义 # [静态] DH [Destination Hashing] 目标地址散列,一个用户一直访问一个服务器，可以缓存一些数据，权重有意义 # [静态] SH [Source Hashing] 源地址散列 # [动态] lc [Least Connections] 最少链接 # [动态] wlc [Weighted Least Connections] 加权最少链接 # [动态] sed [Shortest Expected Delay Scheduling SED] 最短的期望延迟,不考虑非活动链接，只考虑活动链接数 # [动态] LBLC [Locality-Based Least Connections] 基于局部性的最少链接 # [动态] LBLCR [Locality-Based Least Connections with Replication] 带复制的基于局部性最少链接 # [动态] NQ [Never Queue Scheduling NQ] 最少队列调度 lb_algo wlc # 调度模式定义 # NAT：进出都通过调度器，效率低 # DR：直接路由模式（进调度器，出真是主机直接回复） # TUN：隧道模式（类似CDN模式） lb_kind DR # persistence_timeout 60 # 同一IP的连接60秒内被分配到同一台realserver protocol TCP # 用TCP协议检查realserver状态 # 真实主机1配置 real_server 172.20.17.210 80 { weight 3 # 权重 TCP_CHECK { # TCP协议检查（HTTP_GET, TCP_CHECK） connect_timeout 3 # 连接超时时间 nb_get_retry 3 # 重试次数 delay_before_retry 3 # 每次重试前等待延迟时间 connect_port 80 # 链接端口 } } # 真实主机2配置 real_server 172.20.17.211 80 { weight 3 TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 connect_port 80 } }}# 保存退出启动
# 防火墙设置vim /etc/sysconfig/iptables# 增加一条防火墙规则-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT# 重启防火墙/etc/init.d/iptables restart# 重启keepalived/etc/init.d/keepalived startipvsadm -L -nReal 真实服务器配置
脚本名称：lvs_real_server_dr.sh
脚本路劲：/etc/init.d/lvs_real_server_dr.sh
脚本权限：chmod a+x /etc/init.d/lvs_real_server_dr.sh
# !/bin/bash# chkconfig: - 55 45# DRVIPLIST=("172.20.17.200");VIPLENG=${# VIPLIST[*]};VIPI=0;. /etc/rc.d/init.d/functionscase "$1" instart) while [ $VIPI -lt $VIPLENG ]; do ifconfig lo:${VIPI} ${VIPLIST[$VIPI]} broadcast ${VIPLIST[$VIPI]} netmask 255.255.255.255 /sbin/route add -host ${VIPLIST[$VIPI]} dev lo:${VIPI} let VIPI++ 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 sysctl -p >/dev/null 2>&1 echo "RealServer Start OK" ;;stop) while [ $VIPI -lt $VIPLENG ]; do ifconfig lo:${VIPI} down /sbin/route del ${VIPLIST[$VIPI]} >/dev/null 2>&1 let VIPI++ 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 /sbin/sysctl -p >/dev/null 2>&1 echo "RealServer Stoped" ;;status) while [ $VIPI -lt $VIPLENG ]; do islothere=`/sbin/ifconfig lo:${VIPI} | grep ${VIPLIST[$VIPI]}` isrothere=`netstat -rn | grep "lo:${VIPI}" | grep ${VIPLIST[$VIPI]}` if [ ! "$islothere" -o ! "isrothere" ];then echo "LVS RealServer Stopped ${VIPLIST[$VIPI]}." else echo "LVS RealServer Running ${VIPLIST[$VIPI]}." fi let VIPI++ done ;;*) echo "$0: Usage: $0 {start|status|stop}" exit 1 ;;esacexit 0# 添加开机启动服务器chkconfig --add lvs_real_server_dr.shchkconfig --level 2345 lvs_real_server_dr.sh on# 启动lvs_real_server_dr.sh脚本/etc/init.d/lvs_real_server_dr.sh startlvs集群结果验证
验证前必须保证后端的两台真实服务器可以正常访问，有lnmp环境
# 在master负载均衡器上查看ipvsadm -L -n关键字：lvs, 集群
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