在某次强行对机子断电后，再开机后发现docker没启动
运行service docker start显示docker start/running, process xxxx，之后不一会儿就停止了，
再运行service docker status显示docker stop/waiting
这时候使用docker -d或者docker daemon来查看错误
Warning: '-d' is deprecated, it will be removed soon. See usage.
WARN[] please use 'docker daemon' instead.
INFO[] [graphdriver] using prior storage driver "aufs"
INFO[] API listen on /var/run/docker.sock
INFO[] Firewalld running: false
FATA[] Error starting daemon: Error initializing network controller: could not delete the default bridge network: network bridge has active endpoints
这里关键是Error starting daemon: Error initializing network controller: could not delete the default bridge network: network bridge has active endpoints
是docker的网络出现问题，解决方法如下：
rm -rf /var/lib/docker/network/files/*
service docker start