lvs+keepalived配置

软件下载：

http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz

http://www.keepalived.org/software/keepalived-1.1.15.tar.gz

IP列表：

LVS-DR-Master:192.168.9.36

LVS-DR-Backup:192.168.9.4

LVS-DR-VIP:192.168.9.6

Web1-RealServer:192.168.9.48

Web2-RealServer:192.168.9.43

首先保证realserver上web服务都能正常访问：

 

 

一、Master和Backup上安装软件：

 

#ln -s /usr/src/kernels/2.6.18-164.el5-x86_64/ /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.

 

二、配置LVS:

1、LVS-DR，配置LVS脚本实现负载均衡脚本(不用LVS此步可省略):

#vim /usr/local/sbin/lvs-dr.sh

#!/bin/bash
# description: start LVS of DirectorServer
GW=192.168.10.1
#WebSite director VIP.
SNS_VIP=192.168.9.6
SNS_RIP1=192.168.9.48
SNS_RIP2=192.168.9.4

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

logger $0 called with $1
case "$1" in
start)
# set squid vip
/sbin/ipvsadm --set 30 5 60
/sbin/ifconfig eth0:0 $SNS_VIP broadcast $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP up
/sbin/route add -host $SNS_VIP dev eth0:0
/sbin/ipvsadm -A -t $SNS_VIP:80 -s wrr -p 3
/sbin/ipvsadm -a -t $SNS_VIP:80 -r $SNS_RIP1:80 -g -w 1
/sbin/ipvsadm -a -t $SNS_VIP:80 -r $SNS_RIP2:80 -g -w 1
touch /var/lock/subsys/ipvsadm >/dev/null 2>&1
;;
stop)
/sbin/ipvsadm -C
/sbin/ipvsadm -Z
ifconfig eth0:0 down
ifconfig eth0:1 down
route del $SNS_VIP
route del $SS_VIP
rm -rf /var/lock/subsys/ipvsadm >/dev/null 2>&1
echo "ipvsadm stoped"
;;
status)
if [ ! -e /var/lock/subsys/ipvsadm ];then
echo "ipvsadm stoped"
exit 1
else
echo "ipvsadm OK"
fi
;;
*)
echo "Usage: $0 {start|stop|status}"
exit 1
esac

exit 0

 

2、配置realserver脚本：

#!/bin/bash
# description: Config realserver lo and apply noarp
SNS_VIP=192.168.9.6
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_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 $SNS_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"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0

 

三、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

! Configuration File for keepalived

global_defs {
   notification_email {
     [email protected]
#     [email protected]
#     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   #smtp_connect_timeout 30
   router_id LVS_DEVEL
}
#VIP1
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 {
        192.168.9.6
    }
}

virtual_server 192.168.9.6 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 0
    protocol TCP

real_server 192.168.9.48 80 {
        weight 3
        TCP_CHECK {
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}
real_server 192.168.9.43 80 {
        weight 3
        TCP_CHECK {
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

}

 

2.配置在从负载均衡服务器上配置keepalived.conf

 

#vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     [email protected]
#     [email protected]
#     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   #smtp_connect_timeout 30
   router_id LVS_DEVEL
}
#VIP1
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.9.6
    }
}

virtual_server 192.168.9.6 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 0
    protocol TCP

real_server 192.168.9.48 80 {
        weight 3
        TCP_CHECK {
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}
real_server 192.168.9.43 80 {
        weight 3
        TCP_CHECK {
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

}

配置完以后service keepalived restart

 

查看lvs服务是否正常

四、测试

#watch ipvsadm –ln

#tail –f /var/log/message 监听日志，查看状态

停Master服务器的keepalived服务，查看BAKCUP服务器是否能正常接管.

停止其中一台的realserver的httpd服务，wget看是否能正常下载，以及连接是否平均

#for i in {1..10};do wget -S -O /dev/null http://192.168.9.6/index.php;done