LVS+Keepalived实现高可用集群一

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 ...

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*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）。
Keepalvied

Keepalived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:

1. LVS-DR-Master 192.168.2.166

2. LVS-DR-BACKUP 192.168.2.167

3. LVS-DR-VIP 192.168.2.170

4. WEB1-Realserver 192.168.2.171

5. WEB2-Realserver 192.168.2.172

6. 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

1. #lsmod |grep ip_vs

2. #uname -r

3. 2.6.18-53.el5PAE

4. #ln -s /usr/src/kernels/2.6.18-53.el5PAE-i686/ /usr/src/linux

6. #tar zxvf ipvsadm-1.24.tar.gz

7. #cd ipvsadm-1.24

8. #make && make install

9. #find / -name ipvsadm # 查看ipvsadm的位置

10.

11. #tar zxvf keepalived-1.1.15.tar.gz

12. #cd keepalived-1.1.15

13. #./configure && make && make install

14. #find / -name keepalived # 查看keepalived位置

15.

16. #cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

17. #cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

18. #mkdir /etc/keepalived

19. #cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

20. #cp /usr/local/sbin/keepalived /usr/sbin/

21. #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.org
GW=192.168.2.253

# website director vip.
WEB_VIP=192.168.2.170
WEB_RIP1=192.168.2.171
WEB_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 1
esac

exit 0

2．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" in
start)
       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
;;
esac
exit 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 forwarding
net.ipv4.ip_forward = 1

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.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 = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.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

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