参考https://awen.me/post/3738069748.html
docker build 报错
kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1
解决办法
yum -y update
更新下系统就没有出错了
kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1
原文：https://www.cnblogs.com/luanyulin/p/10830875.html