LVS-TUN隧道模式

当然可以。以下是按照您的要求整理的表格形式的实验手册：

主机名称	网卡信息	安装应用	系统
Client客户端	192.168.2.101	无	RHEL8/CentOS8
Lvs服务器（DR）	DIP:192.168.2.110 VIP:192.168.40.111	ipvsadm	RHEL8/CentOS8
RS1	RIP:192.168.2.111	httpd	RHEL8/CentOS8
RS2	RIP:192.168.2.112	httpd	RHEL8/CentOS8

这里的每个主机都有其特定的功能和配置：

Client客户端：用于发起请求。
Lvs服务器（DR）：作为负载均衡器，负责接收和分发流量。
RS1 和 RS2：作为真实服务器，处理来自负载均衡器的请求。

负载均衡器 (LB)

保存 IPVS 配置:
sh 复制代码
```
ipvsadm --save > /etc/sysconfig/ipvsadm
```

启用 IP 转发:

sh 复制代码

echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
sysctl -p

配置 TUN 接口:

sh 复制代码

ifconfig tunl0 192.168.2.200 broadcast 192.168.2.200 netmask 255.255.255.255 up

创建虚拟服务器并设置轮询调度:
sh 复制代码
```
ipvsadm -A -t 192.168.2.200:80 -s rr
```

添加真实服务器:

sh 复制代码

ipvsadm -a -t 192.168.2.200:80 -r 192.168.2.111:80 -i
ipvsadm -a -t 192.168.2.200:80 -r 192.168.2.112:80 -i

禁用防火墙与 SELinux:

sh 复制代码

systemctl stop firewalld.service
setenforce 0

验证 IPVS 配置:
sh 复制代码
```
ipvsadm -ln
```

真实服务器 1 (RS1)

启动 HTTP 服务:
sh 复制代码
```
systemctl start httpd
```

禁用 SELinux 和防火墙:

sh 复制代码

setenforce 0
systemctl stop firewalld.service

配置网站内容:

sh 复制代码

echo "this is web1" >> /var/www/html/index.html

测试网站:
sh 复制代码
```
curl 127.0.0.1
```

配置 TUN 接口:

sh 复制代码

ifconfig tunl0 192.168.2.200 broadcast 192.168.2.200 netmask 255.255.255.255 up

调整 sysctl 设置:

sh 复制代码

echo "net.ipv4.conf.tunl0.arp_ignore = 1" >> /etc/sysctl.conf
echo "net.ipv4.conf.tunl0.arp_announce = 2" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.arp_ignore = 1" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.arp_announce = 2" >> /etc/sysctl.conf
echo "net.ipv4.conf.tunl0.rp_filter = 0" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.rp_filter = 0" >> /etc/sysctl.conf
sysctl -p

真实服务器 2 (RS2)

启动 HTTP 服务:
sh 复制代码
```
systemctl start httpd
```

禁用 SELinux 和防火墙:

sh 复制代码

setenforce 0
systemctl stop firewalld.service

配置网站内容:

sh 复制代码

echo "this is web2" >> /var/www/html/index.html

测试网站:
sh 复制代码
```
curl 127.0.0.1
```

配置 TUN 接口:

sh 复制代码

ifconfig tunl0 192.168.2.200 broadcast 192.168.2.200 netmask 255.255.255.255 up

调整 sysctl 设置:

sh 复制代码

echo "net.ipv4.conf.tunl0.arp_ignore = 1" >> /etc/sysctl.conf
echo "net.ipv4.conf.tunl0.arp_announce = 2" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.arp_ignore = 1" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.arp_announce = 2" >> /etc/sysctl.conf
echo "net.ipv4.conf.tunl0.rp_filter = 0" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.rp_filter = 0" >> /etc/sysctl.conf
sysctl -p

测试

测试负载均衡器:

sh 复制代码

curl 192.168.2.200

sh 复制代码

[root@localhost ~]# curl 192.168.2.200
this is web2
[root@localhost ~]# curl 192.168.2.200
this is web1
[root@localhost ~]# curl 192.168.2.200
this is web2
[root@localhost ~]# curl 192.168.2.200
this is web1
[root@localhost ~]# curl 192.168.2.200
this is web2
[root@localhost ~]# curl 192.168.2.200
this is web1
[root@localhost ~]# curl 192.168.2.200
this is web2
[root@localhost ~]# curl 192.168.2.200
this is web1