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服务器IP地址规划（10.x模拟公网地址，192.x私网地址，172.x私网地址）

NFS：192.168.30.33
WEB1:192.168.30.17
WEB2:192.168.30.27
LVS:192.168.30.7 VIP:10.0.0.100
DNS:172.20.42.27
Mysql:192.168.30.30
Route:192.168.30.208, 10.0.0.200,172.20.42.200
Client: Windows IP 172.20.42.222

各服务器配置

WEB1

1. 网络
    ifcfg-eth0
    DEVICE=eth0
    IPADDR=192.168.30.17
    PREFIX=24
    GATEWAY=192.168.30.208
    ifcfg-eth0:1
    DEVICE=eth0:1
    IPADDR=10.0.0.100
    PREFIX=8
2. 安装相应的包
    yum install httpd php-fpm php-mysql -y
3. 在RS上修改内核参数以限制arp通告及应答级
    echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce

WEB2

参考WEB1，只是将IP更改为192.168.30.27

DNS

1. 安装 yum install bind -y
2. 配置 

vim /etc/named.rfc1912.zones
zone "blog.com" IN {
type master;
file "blog.com.zone";
};
vim /var/named/blog.com.zone
$TTL D
@ IN SOA master.blog.com admin.blog.com. (
0 ; serial
D ; refresh
H ; retry
W ; expire
H ) ; minimum
NS master
master A 172.20.42.27
www A 10.0.0.100

3. 启动systemctl restart named

Route路由配置

1. 网络
    ifcfg-eth0
    DEVICE=eth0
    BOOTPROTO=none
    IPADDR=192.168.30.208
    PREFIX=24
    ifcfg-eth0:1
    DEVICE=eth0:1
    BOOTPROTO=none
    IPADDR=10.0.0.200
    PREFIX=8
    ifcfg-eth1
    DEVICE=eth1
    BOOTPROTO=none
    IPADDR=172.20.42.200
    PREFIX=16
2. 启用ip_forward
    echo 1 > /prov/sys/net/ipv4/ip_forward
    sysctl -a |grep ip_forward: net.ipv4.ip_forward = 1

LVS配置

1. 网络
ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
IPADDR=192.168.30.7
PREFIX=24
GATEWAY=192.168.30.208
ifcfg-eth0:1
DEVICE=eth0:1
BOOTPROTO=none
IPADDR=10.0.0.100
PREFIX=8
2. 运行如下的脚本（适当进行更改）
   [root@lvs ~]#cat lvs_dr_vs.sh 
    #!/bin/bash
    #Author:wangxiaochun
    #Date:2017-08-13
    vip=‘10.0.0.100‘
    iface=‘eth0:1‘
    mask=‘255.255.255.255‘
    port=‘80‘
    rs1=‘192.168.30.17‘
    rs2=‘192.168.30.27‘
    scheduler=‘wrr‘
    type=‘-g‘
    rpm -q ipvsadm &> /dev/null || yum -y install ipvsadm &> /dev/null

    case $1 in
start)
    ifconfig $iface $vip netmask $mask #broadcast $vip up
    iptables -F

    ipvsadm -A -t ${vip}:${port} -s $scheduler
    ipvsadm -a -t ${vip}:${port} -r ${rs1} $type -w 1
    ipvsadm -a -t ${vip}:${port} -r ${rs2} $type -w 1
    echo "The VS Server is Ready!"
    ;;
stop)
    ipvsadm -C
    ifconfig $iface down
    echo "The VS Server is Canceled!"
    ;;
*)
    echo "Usage: $(basename $0) start|stop"
    exit 1
    ;;
esac
    3. 查看ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
      -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
    TCP  10.0.0.100:80 wrr
      -> 192.168.30.17:80             Route   1      0          0         
      -> 192.168.30.27:80             Route   1      0          0         
    4. 更改lvs-dr的调度策略
    ipvsadm -C
    ipvsadm -A -t 10.0.0.100:80 -s rr
    ipvsadm -a -t 10.0.0.100:80 -r 192.168.30.17
    ipvsadm -a -t 10.0.0.100:80 -r 192.168.30.27
    5. 测试新的策略
    在Linux客户机上，配置网络
    DEVICE=eth2
    BOOTPROTO=none
    IPADDR=172.20.0.7![](https://images2018.cnblogs.com/blog/1386066/201807/1386066-20180703114658714-1685106874.png)


    PREFIX=16
    GATEWAY=172.20.42.200
    DNS1=172.20.42.27

    [root@centos7 ~]# curl www.blog.com
    web1
    [root@centos7 ~]# curl www.blog.com
    web2
    [root@centos7 ~]# curl www.blog.com
    web1
    [root@centos7 ~]# curl www.blog.com
    web2
    测试结论：达到了roundrobin轮询的效果
    6. 在windows PC上测试

在浏览器中访问www.blog.com，可以看出，不是每次刷新网站都会切换网站，是因为浏览器的缓存导致。

实验lvs+dns+nfs+mysql+web

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原文地址：https://www.cnblogs.com/liangjindong/p/9257015.html