Centos 5.5 lvs+keepalived 安装配置

转自：http://www.xtgly.com/2010/12/17/centos-5-5-lvskeepalived-%E5%AE%89%E8%A3%85%E9%85%8D%E7%BD%AE.htm

部署:

LVS-MASTER : 192.168.1.2

LVS-BACKUP : 192.168.1.3

LVS-VIP : 192.168.1.4

Realserver-1 : 192.168.1.5

Realserver-2 : 192.168.1.6

1. 系统采用最小化安装

2. 安装ipvsadm

# yum install ipvsadm

3. 安装keepalived前提

# yum install -y wget

# yum install -y gcc gcc-c++ make

# yum install -y openssl-devel kernel-devel

4. 安装keepalived

# wget http://www.keepalived.org/software/keepalived-1.2.1.tar.gz
# ln -s /usr/src/kernels/2.6.18-194.26.1.el5-i686 /usr/src/linux

# tar zxvf keepalived-1.2.1.tar.gz

# cd keepalived-1.2.1

# ./configure

(注意这个步骤要看到以下字样才是正常的)

Use IPVS Framework : Yes

IPVS sync daemon support : Yes

# make && make install

5. 配置

# 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/

# chkconfig --add keepalived

# chkconfig --level 2345 keepalived on

# vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
notification_email {
fjcyz@qq.com
}
notification_email_from fjcyz@qq.com
smtp_server 127.0.0.1
# smtp_connect_timeout 30
router_id LVS_DEVEL
}

vrrp_instance VI_1 {
state MASTER # 备份LB将MASTER改为BACKUP
interface eth0
virtual_router_id 51
priority 100 # 优先级,备份LB值改为比这个值小
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.4 # 多个VIP换行写
}
}

virtual_server 192.168.1.4 80 {
delay_loop 6 #每隔6秒查询realserver状态
lb_algo wrr # LVS 算法
lb_kind DR # LVS模式 DR是直接路由
persistence_timeout 60 #同一IP连接60秒内分配到同一台realserver
protocol TCP #TCP协议检测realserver状态

real_server 192.168.1.5 80 {
weight 3 #权重
TCP_CHECK {
connect_timeout 10 #10秒无响应超时
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.6 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}

6. Realserver主机上执行以下脚本

#!/bin/bash

VIP=192.168.1.4

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

case "$1" in
start)
ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
/sbin/route add -host $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 $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

7. 检查测试

主备LB上执行

# service keepalived start

# ipvsadm -ln

检查ipvsadm是否服务正常

再把主LB执行

# service keepalived stop

查看备LB是否会自动接管VIP

另外就是做Realserver停止服务的测试,具体就不详说了.