LVS-NAT

LVS-NAT 模型实现WEB负载均衡

Posted by Mathew on 2017-02-11

LVS-NAT 模型实现WEB负载均衡

主机规划：
| 主机名 | 主机地址 | 角色 | OS |
| :-------- | --------| -------- | :–: |
| Director | 192.168.1.9/192.168.20.2 | Director | CentOS 6.8|
| RS1 | 192.168.20.7 | Real Server1| CentOS 7.2|
| RS2 | 192.168.20.8 | Real Server2| CentOS 7.2|

Notice:
 注意：我这里node1和node2的网关均是192.168.20.2，所有主机selinux和iptables均关闭。

RS1

配置web服务

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[root@rs1 ~]#  yum install httpd -y
[root@rs1 ~]#  echo "<h1>Test Page On node1.maricle.com.cn</h1>" >> /var/www/html/index.html
[root@rs1 ~]#  systemctl start httpd
[root@rs1 ~]#  ss -tnlp | grep 80 
LISTEN     0      128         :::80                      :::*                   users:(("httpd",pid=6562,fd=4),("httpd",pid=6561,fd=4),("httpd",pid=6560,fd=4),("httpd",pid=6559,fd=4),("httpd",pid=6558,fd=4),("httpd",pid=6557,fd=4))
[root@rs1 ~]# curl 192.168.20.7
<h1>Test Page On node1.maricle.com.cn</h1>

RS2

配置web服务

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[root@rs2 ~]# yum install httpd -y
[root@rs2 ~]# echo "<h1>Test Page On node2.maricle.com.cn</h1>" >> /var/www/html/index.html
[root@rs2 ~]# systemctl start httpd
[root@rs2 ~]# ss -tnlp | grep 80 
LISTEN     0      128         :::80                      :::*                   users:(("httpd",pid=6562,fd=4),("httpd",pid=6561,fd=4),("httpd",pid=6560,fd=4),("httpd",pid=6559,fd=4),("httpd",pid=6558,fd=4),("httpd",pid=6557,fd=4))

Director Server中安装ipvsadm

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[root@Director ~]# ip a | grep inet
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
    inet 192.168.1.9/24 brd 192.168.1.255 scope global eth0
    inet6 fe80::20c:29ff:fe33:9a8e/64 scope link tentative dadfailed 
    inet 192.168.20.2/24 brd 192.168.20.255 scope global eth1
    inet6 fe80::20c:29ff:fe33:9a98/64 scope link 
[root@Director ~]# yum install ipvsadm -y 

[root@Director ~]# curl 192.168.20.7     # 可以访问RS1
<h1>Test Page On RS1.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.20.8     # 可以访问RS2
<h1>Test Page On RS2.maricle.com.cn</h1>
[root@Director ~]# vim /etc/sysctl.conf  # 开启核心转发
[root@Director ~]# sysctl -p
net.ipv4.ip_forward = 1
[root@Director ~]# 

## 添加ipvsadm规则  
## rr算法
[root@Director ~]# ipvsadm -A -t 192.168.1.9:80 -s rr
[root@Director ~]# ipvsadm -L -n ^C
[root@Director ~]# 
[root@Director ~]# 
[root@Director ~]# ipvsadm -a -t 192.168.1.9:80 -r 192.168.20.7 -m 
[root@Director ~]# ipvsadm -a -t 192.168.1.9:80 -r 192.168.20.8 -m 
[root@Director ~]# ipvsadm -L -n 
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.1.9:80 rr
  -> 192.168.20.7:80              Masq    1      0          0         
  -> 192.168.20.8:80              Masq    1      0          0   

[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS2.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS1.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS2.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS1.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS2.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS1.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
[root@Director ~]# ipvsadm -L -n 
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.1.9:80 rr
  -> 192.168.20.7:80              Masq    1      0          12        
  -> 192.168.20.8:80              Masq    1      0          13        
[root@Director ~]# 

## sh算法
[root@Director ~]# ipvsadm -E -t 192.168.1.9:80 -s sh 
[root@Director ~]# ipvsadm -L -n 
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.1.9:80 sh
  -> 192.168.20.7:80              Masq    1      0          0         
  -> 192.168.20.8:80              Masq    1      0          0         
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS1.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS1.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS1.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS1.maricle.com.cn</h1>
[root@Director ~]# curl 192.168.1.9
<h1>Test Page On RS1.maricle.com.cn</h1>
root@Director ~]# ipvsadm -L -n 
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.1.9:80 sh
  -> 192.168.20.7:80              Masq    1      0          11        
  -> 192.168.20.8:80              Masq    1      0          0

关于rr算法和sh算法请看我上一篇博客LVS工作模型和调度算法详解

本文偏操作，下面一篇将介绍DR模型的实现

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