在CentOS7中无法启动docker守护进程
执行systemctl start docker ，我得到：
无法启动docker.service：找不到单元。
这是systemctl status docker -l的输出：
[root@HP11012078 init.d]# systemctl status docker -l ● docker.service - Docker Application Container Engine Loaded: loaded (/etc/systemd/system/docker.service; disabled; vendor preset: disabled) Active: inactive (dead) Docs: https://docs.docker.com Feb 09 17:04:35 HP11012078 docker[28152]: time="2017-02-09T17:04:35.104333869+08:00" level=warning msg="container 58a5c6ba6710240bb5b1fd79e4600b547cf4c882eb2ca85e15c59c1404106877 restart canceled" Feb 09 17:04:35 HP11012078 docker[28152]: time="2017-02-09T17:04:35.113914527+08:00" level=warning msg="container d320ba5f02cdd8567893acfc62b6673a24b6c8a43ccb52342bb3470ff420230d restart canceled" Feb 09 17:04:35 HP11012078 docker[28152]: time="2017-02-09T17:04:35.122613873+08:00" level=warning msg="container 4030daadb9481a1b96b7a5c614c8910a601f83f2dced8340f4ea4c3583e7e844 restart canceled" Feb 09 17:04:45 HP11012078 docker[28152]: time="2017-02-09T17:04:45.002120051+08:00" level=info msg="Container c13f11ce792c477d9b663c6fdbcfe9694663f7843a40540c58922893f4b41247 failed to exit within 10 seconds of signal 15 - using the force" Feb 09 17:04:45 HP11012078 docker[28152]: time="2017-02-09T17:04:45.002120421+08:00" level=info msg="Container 0457d15d8b0bc83458dd3eea0c0b84699465da9746defc2429db89e426dbfa75 failed to exit within 10 seconds of signal 15 - using the force" Feb 09 17:04:45 HP11012078 docker[28152]: time="2017-02-09T17:04:45.002870012+08:00" level=warning msg="Cannot kill container c13f11ce792c477d9b663c6fdbcfe9694663f7843a40540c58922893f4b41247: rpc error: code = 2 desc = \"containerd: container not found\"" Feb 09 17:04:45 HP11012078 docker[28152]: time="2017-02-09T17:04:45.049505738+08:00" level=warning msg="container 0457d15d8b0bc83458dd3eea0c0b84699465da9746defc2429db89e426dbfa75 restart canceled" Feb 09 17:04:45 HP11012078 docker[28152]: time="2017-02-09T17:04:45.173034929+08:00" level=error msg="Force shutdown daemon" Feb 09 17:04:45 HP11012078 docker[28152]: time="2017-02-09T17:04:45+08:00" level=info msg="stopping containerd after receiving terminated" Feb 09 17:04:46 HP11012078 systemd[1]: Stopped Docker Application Container Engine.
但是我可以使用docker daemon命令启动docker。 请帮助
要解决这个问题，必须创build一个丢失的文件：/usr/lib/systemd/system/docker.socket
[Unit] Description=Docker Socket for the API PartOf=docker.service [Socket] ListenStream=/var/run/docker.sock SocketMode=0660 SocketUser=root SocketGroup=docker [Install] WantedBy=sockets.target
然后运行：
systemctl daemon-reload systemctl start docker.socket systemctl start docker
然后Docker将启动。 它看起来像安装删除该文件，并不会取代它。
只需尝试再次安装docker，查看问题是否依然存在：
yum install docker
然后service docker start和docker info 。