docker重启后遇到这个问题，记录一下解决办法

systemctl status docker.service
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since 四 2020-03-19 11:05:18 CST; 6s ago
     Docs: https://docs.docker.com
  Process: 16566 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE)
 Main PID: 16566 (code=exited, status=1/FAILURE)

3月 19 11:05:16 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
3月 19 11:05:16 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
3月 19 11:05:16 localhost.localdomain systemd[1]: docker.service failed.
3月 19 11:05:18 localhost.localdomain systemd[1]: docker.service holdoff time over, scheduling restart.
3月 19 11:05:18 localhost.localdomain systemd[1]: Stopped Docker Application Container Engine.
3月 19 11:05:18 localhost.localdomain systemd[1]: start request repeated too quickly for docker.service
3月 19 11:05:18 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
3月 19 11:05:18 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
3月 19 11:05:18 localhost.localdomain systemd[1]: docker.service failed.

查看一下配置文件

/etc/docker/daemon.json

结果内容显示：

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://i7j691ev.mirror.aliyuncs.com"],
  "log-driver":"json-file",
  "log-opts":{"max-size":"500m","max-file":"3"}
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

这个文件应该是个标准的json文件，不知为啥多了几行。。。

把多余的删掉就好了！