LVS负载均衡集群之NAT模式
一、环境
4台虚拟机：1台Client、1台DirectorServer、2台RealServer。IP地址分别如下：
Client:192.168.1.250
DS:VIP:192.168.1.252,DIP:10.10.10.10
RealServer1:10.10.10.80 Gateway:10.10.10.10
RealServer2:10.10.10.81 Gateway:10.10.10.10
二、安装配置RealServer
RealServer1:
yum -y install httpd
chkconfig httpd on
echo "RealServer1" >> /var/www/html/index.html
sed -i '276a ServerName localhost:80' /etc/httpd/conf/httpd.conf
service httpd start
RealServer2:
yum -y install httpd
chkconfig httpd on
echo "RealServer2" >> /var/www/html/index.html
sed -i '276a ServerName localhost:80' /etc/httpd/conf/httpd.conf
service httpd start
三、安装配置DirectorServer
开启系统转发功能；配置文件：/etc/sysctl.conf（net.ipv4.ip_forward = 1）；
yum -y install ipvsadm
ipvsadm -A -t 192.168.1.252:80 -s wlc
ipvsadm -a -t 192.168.1.252:80 -r 10.10.10.80 -m -w 1
ipvsadm -a -t 192.168.1.252:80 -r 10.10.10.81 -m -w 1
service ipvsadm save
ipvsadm -L -n
参数说明：
-A 添加集群服务；
-t TCP协议；
-s 指定调度算法；
-m 指定为NAT模式；
-w 权重；
四、Client访问测试
ab -c 10 -n 1000 http://192.168.1.252/index.html
