echo "1" > /proc/sys/net/ipv4/ip_forward --允許轉發
ipvsadm -A -t 192.168.1.20:80 -s wlc --爲LVS添加算法，WLC爲最小負載
ipvsadm -a -t 192.168.1.20:80 -r 192.168.1.9:80 -g --添加客戶端
ipvsadm -a -t 192.168.1.20:80 -r 192.168.1.69:80 -g
[root@master ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.1.20:80 wlc
-> 192.168.1.9:80 Route 1 0 0
-> 192.168.1.69:80 Route 1 0 0
此時Activeconn和inActconn都爲0，因爲無客戶端的請求
【安裝LVS】
1、【主從都要執行】
yum -y install ipvsadm
ipvsadm -C 清除lvs上所有的規則
2、【keepalived】 主從都要配置
[root@CentOS-LVS_MASTER ~]# wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz
[root@CentOS-LVS_MASTER ~]# tar zxvf keepalived-1.2.4.tar.gz
[root@CentOS-LVS_MASTER ~]# cd keepalived-1.2.4
[root@CentOS-LVS_MASTER keepalived-1.2.4]# ./configure && make && make install
######### 將keepalived做成啓動服務，方便管理##########
[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[root@CentOS-LVS_MASTER ~]# mkdir /etc/keepalived/
[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
[root@CentOS-LVS_MASTER ~]# cp /usr/local/sbin/keepalived /usr/sbin/
[root@CentOS-LVS_MASTER ~]# service keepalived start | stop
2、開啓路由轉發
[root@CentOS-LVS_MASTER ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
[root@CentOS-LVS_MASTER ~]# sysctl -p
3、配置keepalived
! Configuration File for keepalived
global_defs {
notification_email {
}
notification_email_from [email protected]
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 {
192.168.1.20
}
}
virtual_server 192.168.1.20 80 {
delay_loop 6
lb_algo wlc
lb_kind DR
# persistence_timeout 60
protocol TCP
real_server 192.168.1.69 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.9 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
##從的話，只要修改2個地方就行了
一個是state 改爲BACKUP
一個是priority 改爲比100小就行了
然後再開啓keepalived服務
在查看ipvsadm -ln就會出現配置文件中的服務器列表了
查看主從上是否有vip這個ip
3、【配置後端服務器】---讓後端web能與vip通信
vim 1.sh
#!/bin/bash
#description : start realserver
VIP=192.168.1.20
/etc/rc.d/init.d/functions
case "$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
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
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS Directorserver"
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 "Usage: $0 {start|stop}"
exit 1
esac
然後執行該腳本 sh 1.sh start
最後查看web上的ip信息，看看是否有vip
【檢測】
1、查看主上面的日誌信息
然後停了主上面的keepalived服務，查看從上面的日誌信息：
然後停了後端其中一臺WEB，看看lvs會不會把他給剔除掉