LVS配置脚本
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LVS的安装源：ipvsadm
LVS依赖包：popt、popt-devel、popt-static、libnl-devel、libnl
popt-static：popt-static
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1.REAL SERVER配置脚本
使用该脚本时，在下面路径新建脚本，根据情况修改变量RS_VIP为实际的VIP。
/usr/local/sbin/realserver.sh
使用命令realserver.sh start|stop来进行脚本的启停。
#!/bin/bash
# description: Config realserver lo and apply noarp
# Written by :Liaojizhou
RS_VIP=172.24.0.29
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $RS_VIP netmask 255.255.255.255 broadcast $RS_VIP
/sbin/route add -host $RS_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 $RS_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
执行下面命令，开机自动启动
echo "/usr/local/sbin/realserver.sh start" >> /etc/rc.local
2.DR模式的load balancer配置脚本
注意：如果使用了keepalived，请跳过这一段，直接看第三步。
使用该脚本时，在下面路径新建脚本，根据情况修改变量RS_VIP为实际的VIP。
/usr/local/sbin/lvs-dr.sh
DR_VIP：提供给客户端访问的VIP
RIP：后端真实服务器（RS）的IP，如果有多台，需对应添加，并且在后面的转发规则中增加对该RS的转发规则
如果要转发多个端口，需参考脚本中80和443端口转发的格式，增加相应规则
#!/bin/bash
# description: start LVS of DirectorServer
# Written by :Liaojizhou
# website director vip.
DR_VIP=172.24.254.23
RIP1=172.24.254.18
RIP2=172.24.254.19
sh /etc/rc.d/init.d/functions
logger $0 called with $1
case "$1" in
start)
# set vip
/sbin/ipvsadm --set 30 5 60
/sbin/ifconfig bond0:0 $DR_VIP broadcast $DR_VIP netmask 255.255.255.255 broadcast $DR_VIP up
/sbin/route add -host $DR_VIP dev bond0:0
/sbin/ipvsadm -A -t $DR_VIP:80 -s wrr -p 3
/sbin/ipvsadm -a -t $DR_VIP:80 -r $RIP1:80 -g -w 1
/sbin/ipvsadm -a -t $DR_VIP:80 -r $RIP2:80 -g -w 1
/sbin/ipvsadm -A -t $DR_VIP:443 -s wrr -p 3
/sbin/ipvsadm -a -t $DR_VIP:443 -r $RIP1:443 -g -w 1
/sbin/ipvsadm -a -t $DR_VIP:443 -r $RIP2:443 -g -w 1
touch /var/lock/subsys/ipvsadm >/dev/null 2>&1
echo "ipvsadm started"
;;
stop)
/sbin/ipvsadm -C
/sbin/ipvsadm -Z
ifconfig bond0:0 down
route del $DR_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
3.LVS+KEEPALIVED配置脚本
使用了keepalived之后，就不用使用上面的lvs-dr.sh脚本了，而是通过keepalived来启动ipvsadm程序
keepalived的安装包见附件：keepalived安装包
cd keepalived
./configure --sysconf=/etc --with-kernel-dir=/usr/src/linux ; make&& make install ; ln -s /usr/local/sbin/keepalived /sbin/keepalived
该服务的控制可以使用service keepalived {status,start,stop}来操作
chkconfig keepalived on
配置文件在此：/etc/keepalived/keepalived.conf
注意：复制下面脚本的时候请把中文注释全部删去，否则会出现乱码，导致vi编辑时自动跳出，后续维护极为不便！！！
! Configuration File for keepalived
global_defs {
smtp_server 127.0.0.1
# smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER #备份服务器上将MASTER改为BACKUP
interface bond0
virtual_router_id 51
priority 100 # 备份服务上将100改为99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.235 #VIP
}
}
virtual_server 192.168.1.235 80 {
delay_loop 6 #(每隔6秒查询realserver状态)
lb_algo wlc #(lvs 算法)
lb_kind DR #(Direct Route)
persistence_timeout 60 #(同一IP的连接60秒内被分配到同一台realserver)
protocol TCP #(用TCP协议检查realserver状态)
real_server 192.168.1.231 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 192.168.1.232 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
更多参考：http://www.keepalived.org/pdf/sery-lvs-cluster.pdf