最近需要帮助朋友搭建一个LVS，好久没有搭建了，所以此次记录一下，搭建的过程中还是出现了一些问题，好在最后解决了。
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前期规划
LVS-Master: 192.168.10.1
LVS-Slave: 192.168.10.2
LVS-DR-VIP: 192.168.10.3
RealServer1: 192.168.10.4 -
为2个LVS主机安装ipsadm+keepalived
检查系统是否有ipvsadm模块
/sbin/ipvsadmin（是否存在）
lsmod|grep ip_vs（是否存在）
如果存在就说明已有ipvsadmin；如果不存在可以通过yum 或 源码来安装，比较简单，不在此介绍。
安装Keepalived
wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
tar zxvf keepalived-1.1.15.tar.gz
cd keepalived-1.1.15
./configure
make
make install
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
配置keepalived.conf for LVS-master
! Configuration File for keepalived
global_defs {
notification_email {
abc@163.com
}
notification_email_from abc@gmail.com
smtp_server 127.0.0.1
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 {
192.168.10.3
}
}
virtual_server 192.168.10.3 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.10.1 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.10.2 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
配置keepalived.conf for LVS-slave
! Configuration File for keepalived
global_defs {
notification_email {
abc@163.com
}
notification_email_from abc@gmail.com
smtp_server 127.0.0.1
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 {
192.168.10.3
}
}
virtual_server 192.168.10.3 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.10.1 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.10.2 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
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为2个RealServer 编写脚本
vim /usr/local/sbin/realserver
#!/bin/bash
SNS_VIP=192.168.10.3
. /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
4.** 测试**
可以模拟故障进行测试，例如关闭LVS-master，检查LVS-slave是否能够接管过来；关闭一个RealServer，检查服务是否依然能够正常访问。
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配置过程中发现的问题
在centos5.7上安装ipvsadm, keepalived 之后发现使用ipvsadm -ln 没有出现任何信息的情况，后来经过baidu，google发现的问题的所在，是由于编译安装keepalived的时候，最后信息显示有几个No，应该是表示有软件包未装上，但是当时也没 太注意，之后重新yum install kernel kernel-devel，同时指定kernel-dir目录，./configure --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686/再次编译安装keepalived后，信息中有2个No变成了2个Yes. 再次使用ipvsadm -ln发现有信息输出了，使用ps -ef|grep keepalived 发现有3个keepalived -D (之前只有2个)，抓紧测试了下成功了，开心！ -
参考
http://network.51cto.com/art/201006/206831.htm
