1.4 lvs-nat daemon

lvs-nat配置（采用rr调度算法）：
==================================

网络拓扑图：

Client ---> (VIP) Virtual Server (DIP)
               |
               |
               |
             switch
               |
               |---------(RIP1) Real Server 1 
               |
               |---------(RIP1) Real Server 1 

VS、RS1、RS2处在同一网络；

DIP：192.168.206.55    物理网卡:0(VIP)：192.168.206.200
RIP1：192.168.206.66   lo:0(VIP)：192.168.206.200
RIP2：192.168.206.99   lo:0(VIP)：192.168.206.200

GATEWAY：192.168.206.2

1、同步网络时间：~]# ntpdate ntp1.aliyun.com

备注，阿里云有提供ECS内网及外网的NTP服务；
以下为阿里云提供的内网和公网NTP服务器列表：

经典网络 VPC网络公网
ntp1.cloud.aliyuncs.com ntp7.cloud.aliyuncs.com ntp1.aliyun.com
ntp2.cloud.aliyuncs.com ntp8.cloud.aliyuncs.com ntp2.aliyun.com
ntp3.cloud.aliyuncs.com ntp9.cloud.aliyuncs.com ntp3.aliyun.com
ntp4.cloud.aliyuncs.com ntp10.cloud.aliyuncs.com ntp4.aliyun.com
ntp5.cloud.aliyuncs.com ntp11.cloud.aliyuncs.com ntp5.aliyun.com
ntp6.cloud.aliyuncs.com ntp12.cloud.aliyuncs.com ntp6.aliyun.com

2、ipvs集群服务器上安装ipvsadm工具；

~]# yum -y install ipvsadm

3、2台RS主机各安装nginx，并配置一个index.html文件，内容不一样即可(方便测试)；

4、2台RS的网关地址需指向VS的DIP地址；

5、在ipvs集群服务器上配置集群服务、添加RS主机；

采用轮询调度算法；
~]# ipvsadm -A -t 192.168.199.145:80 -s rr

添加2台RS：
~]# ipvsadm -a -t 192.168.199.145:80 -r 192.168.206.66 -m
~]# ipvsadm -a -t 192.168.199.145:80 -r 192.168.206.99 -m

6、开启转发功能：
~]# sysctl -w net.ipv4.ip_forward=1

7、测试：

~]# for i in {1..10}; do curl http://192.168.199.145; done

<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>

lvs-nat配置（采用wrr调度算法）：
==================================

1>修改RS的权重：

~]# ipvsadm -e -t 192.168.199.145:80 -r 192.168.206.66 -m -w 2
~]# ipvsadm -e -t 192.168.199.145:80 -r 192.168.206.99 -m -w 3

2>修改ipvs集群服务的调度算法：
~]# ipvsadm -E -t 192.168.199.145:80 -s wrr

3>测试：

]# for i in {1..20}; do curl http://192.168.199.145; done

<h2> hello 192.168.206.99 ..........  </h2>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>
<h2> hello 192.168.206.99 ..........  </h2>
<h1> hello 192.168.206.66 </h1>

4>查看ipvs集群的连接状态：

]# ipvsadm -Ln –stats

IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port               Conns   InPkts  OutPkts  InBytes OutBytes
  -> RemoteAddress:Port
TCP  192.168.199.145:80                 80      591      465    64950    53048
  -> 192.168.206.66:80                  36      319      263    41627    32556
  -> 192.168.206.99:80                  44      272      202    23323    20492

5> 测试清空计数器：

~]# ipvsadm -Z

~]# ipvsadm -Ln --stats
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port               Conns   InPkts  OutPkts  InBytes OutBytes
  -> RemoteAddress:Port
TCP  192.168.199.145:80                  0        0        0        0        0
  -> 192.168.206.66:80                   0        0        0        0        0
  -> 192.168.206.99:80                   0        0        0        0        0

重新多次访问后，再次查看状态信息；
~]# ipvsadm -Ln --stats
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port               Conns   InPkts  OutPkts  InBytes OutBytes
  -> RemoteAddress:Port
TCP  192.168.199.145:80                 20      118       99    13220     9704
  -> 192.168.206.66:80                   8       46       39     5240     3800
  -> 192.168.206.99:80                  12       72       60     7980     5904

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