docker start问题

问题记录：
docker.socket: Failed with result 'service-start-limit-hit'
docker.service: Service RestartSec=100ms expired, scheduling restart.
docker.service: Scheduled restart job, restart counter is at 3.
Stopped Docker Application Container Engine.
docker.service: Start request repeated too quickly.
docker.service: Failed with result 'exit-code'.
Failed to start Docker Application Container Engine.

解决办法：

1.）docker启动参数设置

vim /lib/systemd/system/docker.service
ExecStart=/usr/sbin/dockerd -H fd:// $DOCKER_OPTS

2.）重新加载配置

systemctl daemon-reload

3.）启动docker

service docker start

4.)查看状态

systemctl status docker.service

5.）查看错误日志

journalctl -xe
journaltctl -fu docker

6.)守护进程配置

vim /etc/docker/daemon.json
{
    "registry-mirrors": ["http://hub-mirror.c.163.com"],
    "insecure-registries":["http://mydomain.com"]
}

7.）修改完配置文件，需要reload

sudo systemctl daemon-reload
sudo systemctl restart docker.service

结论：经过层层排查，发现是daemon.json配置错误，一定要注意格式！！可以尝试把这个文件备份，删掉后重启。