问题：
Docker 容器无法访问外网。
解决方法：
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
结果
net.ipv4.ip_forward = 1
推荐教程：docker教程
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