参考：http://www.fanliugen.com/?p=663
1、问题如下：
cnentos 7.0 为了加速下载docker的镜像库，选择使用阿里在云的镜像。官方后台有下面的配置说明
修改daemon配置文件/etc/docker/daemon.json来使用加速器，
我也就自己新建了相应的json文件，加入了registry-mirrors的地址，但是启动docker时，出现了下面的错误。
[root@localhost ~]# systemctl restart docker Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details. [root@localhost ~]# systemctl start docker Job for docker.service failed because start of the service was attempted too often. See "systemctl status docker.service" and "journalctl -xe" for details. To force a start use "systemctl reset-failed docker.service" followed by "systemctl start docker.service" again. [root@localhost ~]# systemctl status docker ● docker.service - Docker Application Container Engine Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled) Active: failed (Result: start-limit) since 二 2019-06-04 17:00:08 CST; 5min ago Docs: https://docs.docker.com Process: 62996 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE) Main PID: 62996 (code=exited, status=1/FAILURE) 6月 04 17:00:06 localhost.localdomain systemd[1]: docker.service failed. 6月 04 17:00:08 localhost.localdomain systemd[1]: docker.service holdoff time over.... 6月 04 17:00:08 localhost.localdomain systemd[1]: Stopped Docker Application Conta.... 6月 04 17:00:08 localhost.localdomain systemd[1]: start request repeated too quick...e 6月 04 17:00:08 localhost.localdomain systemd[1]: Failed to start Docker Applicati.... 6月 04 17:00:08 localhost.localdomain systemd[1]: Unit docker.service entered fail.... 6月 04 17:00:08 localhost.localdomain systemd[1]: docker.service failed. 6月 04 17:00:40 localhost.localdomain systemd[1]: start request repeated too quick...e 6月 04 17:00:40 localhost.localdomain systemd[1]: Failed to start Docker Applicati.... 6月 04 17:00:40 localhost.localdomain systemd[1]: docker.service failed. Hint: Some lines were ellipsized, use -l to show in full. 2、解决方式：
把daemon.json改为daemon.conf。使用mv命令修改后，docker启动正常。
[root@localhost docker]# mv daemon.json daemon.conf [root@localhost docker]# systemctl start docker [root@localhost docker]# docker version Client: Version: 18.09.6 API version: 1.39 Go version: go1.10.8 Git commit: 481bc77156 Built: Sat May 4 02:34:58 2019 OS/Arch: linux/amd64 Experimental: false Server: Docker Engine - Community Engine: Version: 18.09.6 API version: 1.39 (minimum version 1.12) Go version: go1.10.8 Git commit: 481bc77 Built: Sat May 4 02:02:43 2019 OS/Arch: linux/amd64 Experimental: false [root@localhost docker]# 文章来源: https://blog.csdn.net/li1325169021/article/details/90782846