Practical case of LVS-DR mode
1. Environmental preparation
Architecture design
Environment configuration
Hardware Configuration
Operating system: centos-7.8 cpu: 1*1 hard disk: 20G memory: 2G
Network Configuration
| role | host | ip | VIP | YOU |
|---|---|---|---|---|
| Client | node05 | 192.168.5.5 | ---- | Centos-7.8 |
| Director-Server | node01 | 192.168.5.4 | 192.168.5.100 | Centos-7.8 |
| Web1 | node02 | 192.168.5.11 | 192.168.5.100 | Centos-7.8 |
| Web2 | node03 | 192.168.5.12 | 192.168.5.100 | Centos-7.8 |
| Web3 | node04 | 192.168.5.13 | 192.168.5.100 | Centos-7.8 |
Second, the actual case
Director-Server scripting
#!/bin/sh
#
# Startup script handle the initialisation of LVS
# chkconfig: - 28 72
# description: Initialise the Linux Virtual Server for DR
#
### BEGIN INIT INFO
# Provides: ipvsadm
# Required-Start: $local_fs $network $named
# Required-Stop: $local_fs $remote_fs $network
# Short-Description: Initialise the Linux Virtual Server
# Description: The Linux Virtual Server is a highly scalable and highly
# available server built on a cluster of real servers, with the load
# balancer running on Linux.
# description: start LVS of DR
LOCK=/var/lock/ipvsadm.lock
VIP=192.168.5.100
RIP1=192.168.5.11
RIP2=192.168.5.12
RIP3=192.168.5.13
DipName=ens33
. /etc/rc.d/init.d/functions
start() {
PID=`ipvsadm -Ln | grep ${
VIP} | wc -l`
if [ $PID -gt 0 ];
then
echo "The LVS-DR Server is already running !"
else
#Set the Virtual IP Address
/sbin/ifconfig ${DipName}:100 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev ${DipName}:100
#Clear IPVS Table
/sbin/ipvsadm -C
#Set Lvs
/sbin/ipvsadm -At $VIP:80 -s rr
/sbin/ipvsadm -at $VIP:80 -r $RIP1:80 -g
/sbin/ipvsadm -at $VIP:80 -r $RIP2:80 -g
/sbin/ipvsadm -at $VIP:80 -r $RIP3:80 -g
/bin/touch $LOCK
#Run Lvs
echo "starting LVS-DR Server is ok !"
fi
}
stop() {
#clear Lvs and vip
/sbin/ipvsadm -C
/sbin/route del -host $VIP dev ${DipName}:100
/sbin/ifconfig ${DipName}:100 down >/dev/null
rm -rf $LOCK
echo "stopping LVS-DR server is ok !"
}
status() {
if [ -e $LOCK ];
then
echo "The LVS-DR Server is already running !"
else
echo "The LVS-DR Server is not running !"
fi
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
status)
status
;;
*)
echo "Usage: $1 {start|stop|restart|status}"
exit 1
esac
exit 0
# 添加脚本到系统服务，并启动服务
[root@node04 ~]# chmod +x /etc/init.d/lvs
[root@node04 ~]# chkconfig --add lvs
[root@node04 ~]# chkconfig lvs on
[root@node04 ~]# systemctl start lvs
View lvs cluster
Web1, Web2, and Web3 configuration scripts respectively
# 提供脚本，以Web1为例，其他节点一样
[root@node01 ~]# vim /etc/init.d/lvs_rs
#!/bin/sh
#
# Startup script handle the initialisation of LVS
# chkconfig: - 28 72
# description: Initialise the Linux Virtual Server for DR
#
### BEGIN INIT INFO
# Provides: ipvsadm
# Required-Start: $local_fs $network $named
# Required-Stop: $local_fs $remote_fs $network
# Short-Description: Initialise the Linux Virtual Server
# Description: The Linux Virtual Server is a highly scalable and highly
# available server built on a cluster of real servers, with the load
# balancer running on Linux.
# description: start LVS of DR-RIP
LOCK=/var/lock/ipvsadm.lock
VIP=192.168.5.100
. /etc/rc.d/init.d/functions
start() {
PID=`ifconfig | grep lo:100 | wc -l`
if [ $PID -ne 0 ];
then
echo "The LVS-DR-RIP Server is already running !"
else
/sbin/ifconfig lo:100 $VIP netmask 255.255.255.255 broadcast $VIP up
/sbin/route add -host $VIP dev lo:100
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/ens33/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/ens33/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
/bin/touch $LOCK
echo "starting LVS-DR-RIP server is ok !"
fi
}
stop() {
/sbin/route del -host $VIP dev lo:100
/sbin/ifconfig lo:100 down >/dev/null
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/ens33/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/ens33/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
rm -rf $LOCK
echo "stopping LVS-DR-RIP server is ok !"
}
status() {
if [ -e $LOCK ];
then
echo "The LVS-DR-RIP Server is already running !"
else
echo "The LVS-DR-RIP Server is not running !"
fi
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
status)
status
;;
*)
echo "Usage: $1 {start|stop|restart|status}"
exit 1
esac
exit 0
# 添加脚本到系统服务，并启动服务
[root@node01 ~]# chmod +x /etc/init.d/lvs_rs
[root@node01 ~]# chkconfig --add lvs_rs
[root@node01 ~]# chkconfig lvs_rs on
[root@node01 ~]# systemctl start lvs_rs
View VIP
View routing
[root@node01 ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.5.2 0.0.0.0 UG 100 0 0 ens33
192.168.5.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
192.168.5.100 0.0.0.0 255.255.255.255 UH 0 0 0 lo
[root@node01 ~]# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.5.2 0.0.0.0 UG 0 0 0 ens33
192.168.5.0 0.0.0.0 255.255.255.0 U 0 0 0 ens33
192.168.5.100 0.0.0.0 255.255.255.255 UH 0 0 0 lo
[root@node01 ~]# ip route
default via 192.168.5.2 dev ens33 proto static metric 100
192.168.5.0/24 dev ens33 proto kernel scope link src 192.168.5.11 metric 100
192.168.5.100 dev lo scope link src 192.168.5.100
Three, test
Achieve load balancing! ! !
