What should I do if the docker container cannot access the external network?

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

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