centos7

解决办法：
# vi /etc/sysctl.conf
添加如下代码：
    net.ipv4.ip_forward=1
重启network服务
# systemctl restart network
 
查看是否修改成功
# sysctl net.ipv4.ip_forward
 

如果返回为“net.ipv4.ip_forward = 1”则表示成功了

重新运行镜像

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