LVS+Keepalived实现高可用集群

mac2022-06-30 108

LVS+Keepalived实现高可用集群来源: ChinaUnix博客　日期： 2009.07.21 14:49　(共有条评论) 我要评论操作系统平台：CentOS5.2软件：LVS+keepalived

LVS+Keepalived 介绍

LVS

LVS是Linux Virtual Server的简写，意即Linux虚拟服务器，是一个虚拟的服务器集群系统。本项目在1998年5月由章文嵩博士成立，是中国国内最早出现的自由软件项目之一。目前有三种IP负载均衡技术（VS/NAT、VS/TUN和VS/DR）；十种调度算法（rrr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq）。KeepalviedKeepalived在这里主要用作RealServer的健康状态检查以及LoadBalance主机和BackUP主机之间failover的实现

IP配置信息:LVS-DR-Master 192.168.2.166 LVS-DR-BACKUP 192.168.2.167 LVS-DR-VIP 192.168.2.170 WEB1-Realserver 192.168.2.171 WEB2-Realserver 192.168.2.172 GateWay 192.168.2.253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 -r2.6.18-53.el5PAE#ln -s /usr/src/kernels/2.6.18-53.el5PAE-i686/ /usr/src/linux

#tar zxvf ipvsadm-1.24.tar.gz#cd ipvsadm-1.24#make && make install#find / -name ipvsadm # 查看ipvsadm的位置

#tar zxvf keepalived-1.1.15.tar.gz#cd keepalived-1.1.15#./configure && make && make install#find / -name keepalived # 查看keepalived位置 #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 #做成系统启动服务方便管理.四. 配置LVS实现负载均衡

1． LVS-DR，配置LVS脚本实现负载均衡

vi /usr/local/sbin/lvs-dr.sh

#!/bin/bash# description: start LVS of DirectorServer#Written by :NetSeek http://www.linuxtone.orgGW=192.168.2.253

# website director vip.WEB_VIP=192.168.2.170WEB_RIP1=192.168.2.171WEB_RIP2=192.168.2.172. /etc/rc.d/init.d/functions

logger $0 called with $1

case "$1" in

start) # Clear all iptables rules. /sbin/iptables -F # Reset iptables counters. /sbin/iptables -Z # Clear all ipvsadm rules/services. /sbin/ipvsadm -C

#set lvs vip for dr /sbin/ipvsadm --set 30 5 60 /sbin/ifconfig eth0:0 $WEB_VIP broadcast $WEB_VIP netmask 255.255.255.255 up /sbin/route add -host $WEB_VIP dev eth0:0 /sbin/ipvsadm -A -t $WEB_VIP:80 -s wrr -p 3 /sbin/ipvsadm -a -t $WEB_VIP:80 -r $WEB_RIP1:80 -g -w 1 /sbin/ipvsadm -a -t $WEB_VIP:80 -r $WEB_RIP2:80 -g -w 1 touch /var/lock/subsys/ipvsadm >/dev/null 2>&1 # set Arp /sbin/arping -I eth0 -c 5 -s $WEB_VIP $GW >/dev/null 2>&1 ;;stop) /sbin/ipvsadm -C /sbin/ipvsadm -Z ifconfig eth0:0 down route del $WEB_VIP >/dev/null 2>&1 rm -rf /var/lock/subsys/ipvsadm >/dev/null 2>&1 /sbin/arping -I eth0 -c 5 -s $WEB_VIP $GW echo "ipvsadm stoped" ;;

status)

if [ ! -e /var/lock/subsys/ipvsadm ];then echo "ipvsadm is stoped" exit 1 else ipvsadm -ln echo "..........ipvsadm is OK." fi ;;

*) echo "Usage: $0 {start|stop|status}" exit 1esac

exit 02．配置Realserver脚本.

#!/bin/bash# Written by NetSeek # description: Config realserver lo and apply noarp WEB_VIP=192.168.2.170

. /etc/rc.d/init.d/functions

case "$1" instart) ifconfig lo:0 $WEB_VIP netmask 255.255.255.255 broadcast $WEB_VIP /sbin/route add -host $WEB_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 $WEB_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" ;;status) # Status of LVS-DR real server. islothere=`/sbin/ifconfig lo:0 | grep $WEB_VIP` isrothere=`netstat -rn | grep "lo:0" | grep $web_VIP` if [ ! "$islothere" -o ! "isrothere" ];then # Either the route or the lo:0 device # not found. echo "LVS-DR real server Stopped." else echo "LVS-DR Running." fi;;*) # Invalid entry. echo "$0: Usage: $0 {start|status|stop}" exit 1;;esacexit 0

附上realserver机上的/etc/sysctl.conf：

# Kernel sysctl configuration file for Red Hat Linux## For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and# sysctl.conf(5) for more details.# Controls IP packet forwardingnet.ipv4.ip_forward = 1# Controls source route verificationnet.ipv4.conf.default.rp_filter = 1# Do not accept source routingnet.ipv4.conf.default.accept_source_route = 0# Controls the System Request debugging functionality of the kernelkernel.sysrq = 0# Controls whether core dumps will append the PID to the core filename.# Useful for debugging multi-threaded applications.kernel.core_uses_pid = 1net.ipv4.conf.lo.arp_ignore = 1net.ipv4.conf.lo.arp_announce = 2net.ipv4.conf.all.arp_ignore = 1net.ipv4.conf.all.arp_announce = 2或者采用secondary ip address方式配置# vi /etc/sysctl.conf

添加以下内容如上所示：

net.ipv4.conf.lo.arp_ignore = 1net.ipv4.conf.lo.arp_announce = 2net.ipv4.conf.all.arp_ignore = 1net.ipv4.conf.all.arp_announce = 2#sysctl –p#ip addr add 61.164.122.8/32 dev lo#ip add list 查看是否绑定3. 启动lvs-dr脚本和realserver启本，在DR上可以查看LVS当前状态:#watch ipvsadm –ln

五．利用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 (主调度器)! Configuration File for keepalivedglobal_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL}vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.2.170 }}virtual_server 192.168.2.170 80 { delay_loop 6 lb_algo wrr lb_kind DR persistence_timeout 60 protocol TCP real_server 192.168.2.171 80 { weight 3 TCP_CHECK { connect_timeout 10 nb_get_retry 3 delay_before_retry 3 connect_port 80} } real_server 192.168.2.172 80 { weight 3 TCP_CHECK { connect_timeout 10 nb_get_retry 3 delay_before_retry 3 connect_port 80 } }}

在备用调度器上：#vi /etc/keepalived/keepalived.conf (备用调度器)! Configuration File for keepalivedglobal_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL}vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.2.170 }}virtual_server 192.168.2.170 80 { delay_loop 6 lb_algo wrr lb_kind DR persistence_timeout 60 protocol TCP real_server 192.168.2.171 80 { weight 3 TCP_CHECK { connect_timeout 10 nb_get_retry 3 delay_before_retry 3 connect_port 80} } real_server 192.168.2.172 80 { weight 3 TCP_CHECK { connect_timeout 10 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. vi /etc/rc.local #/usr/local/sbin/lvs-dr.sh 将lvs-dr.sh这个脚本注释掉。 #/usr/local/sbin/lvs-dr.sh stop 停止lvs-dr脚本 #/etc/init.d/keepalived start 启动keepalived 服务，keepalived就能利用keepalived.conf 配置文件，实现负载均衡和高可用.4. 查看lvs服务是否正常 #watch ipvsadm –ln IP Virtual Server version 1.2.1 (size=4096)Prot LocalAddressort Scheduler Flags -> RemoteAddressort Forward Weight ActiveConn InActConnTCP 61.164.122.8:80 wrr persistent 60 -> 61.164.122.10:80 Route 3 0 0 -> 61.164.122.9:80 Route 3 0 0复制代码#tail –f /var/log/message 监听日志，查看状态，测试LVS负载均衡及高可用性是否有效。5．停Master服务器的keepalived服务，查看BAKCUP服务器是否能正常接管服务。四．相关参考1．LVS 基础知识汇总LVS的算法介绍 http://www.linuxtone.org/viewthread.php?tid=69学习LVS的三种转发模式 http://www.linuxtone.org/viewthread.php?tid=77LVS中的IP负载均衡技术 http://www.linuxtone.org/viewthread.php?tid=68更多的请到http://www.linuxtone.org负载均衡版查看Keepalived 相关参考资料。 http://www.keepalived.org/documentation.html

转载于:https://www.cnblogs.com/woxing/p/3420026.html

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