IPv4 forwarding is disabled. Networking will not work

1 问题

今天在操作 docker 时遇到了一个问题IPv4 forwarding is disabled. Networking will not work👇

我的系统是 CentOS7.9

2 解决方案

在宿主机执行

echo "net.ipv4.ip_forward=1" >>/usr/lib/sysctl.d/00-system.conf

然后重启网络和 docker

systemctl restart network
systemctl restart docker