[root@localhost docker]# systemctl status docker.service
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Wed 2022-05-04 17:48:35 CST; 56s ago
     Docs: https://docs.docker.com
  Process: 4231 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE)
 Main PID: 4231 (code=exited, status=1/FAILURE)

May 04 17:48:33 localhost.localdomain systemd[1]: docker.service failed.
May 04 17:48:35 localhost.localdomain systemd[1]: docker.service holdoff time over, scheduling restart.
May 04 17:48:35 localhost.localdomain systemd[1]: Stopped Docker Application Container Engine.
May 04 17:48:35 localhost.localdomain systemd[1]: start request repeated too quickly for docker.service
May 04 17:48:35 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
May 04 17:48:35 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
May 04 17:48:35 localhost.localdomain systemd[1]: docker.service failed.
May 04 17:49:15 localhost.localdomain systemd[1]: start request repeated too quickly for docker.service
May 04 17:49:15 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
May 04 17:49:15 localhost.localdomain systemd[1]: docker.service failed.
[root@localhost docker]# cat /etc/docker/daemon.json
{
    "registry-mirrors": ["http://hub-mirror.c.163.com"]",graph":"/data/dockerinstall"
}

解决方法：

1.防火墙和selinux都关了

vim /etc/sysconfig/selinux

systemctl stop firewalld

2.修改/etc/docker/daemon.json这个文件（就这样粘贴复制，别多逗号）

{

"registry-mirrors": ["http://hub-mirror.c.163.com"]

}

之前是

3.重启docker，在不行重启虚拟机

systemctl daemon-reload

systemctl restart docker.service

systemctl status docker.service

启动成功