docker WARNING: IPv4 forwarding is disabled. Networking will not work.

创建docker registry的时候报错：

[root@master ~]# docker run --name registry_server -d -p 5000:5000 -v /registry:/tmp/registry registry
WARNING: IPv4 forwarding is disabled. Networking will not work.
a93d14f536d31b3edfd847f12c8e1115bb75bc2b202fb44f761c2e14c2018a6b

解决办法：

或者

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