nat模式 

在负载均衡服务器端有两块网卡。。。192.168.1.142和192.168.142.1

192.168.142.2和192.168.142.3为web服务器

yum install -y ipvsadm

net.ipv4.ip_forward = 1写到    vi /etc/sysctl.conf 

ipvsadm -A -t 192.168.1.142:80 -s rr
ipvsadm -a -t 192.168.1.142:80 -r 192.168.142.2:80 -m -w 1
ipvsadm -a -t 192.168.1.142:80 -r 192.168.142.3:8080 -m -w 1
ipvsadm -L -n
ipvsadm-save -n > /opt/lvsnat.sh

ipvsadm-restore < /opt/lvsnat.sh
cat /opt/lvsnat.sh
ipvsadm --set 1 5 300

curl 192.168.1.142:80

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LVS 小实验实现