After executing systemctl start docker, I got:
Failed to start docker.service: Unit not found.
And this is the output for systemctl status docker -l:
[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.
But I can start docker using docker daemon command. Help, please
To resolve this issue, one have to create a missing file: /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
Then run:
systemctl daemon-reload
systemctl start docker.socket
systemctl start docker
Then Docker will start. It looks like the install removes that file and doesn't replace it.
Simply try and install again docker, to see if the issue persists:
sudo yum install docker
Then service docker start and docker info.
If you get this error when installing Docker on CentOS 8:
On CentOS 8.1 the podman-manpages are in conflict with docker-ce (podman is Red Hat's container engine, and which comes pre-installed as a replacement for Docker).
A simple solution is to uninstall podman if you don't need it:
sudo yum -y remove podman
https://github.com/containers/libpod/issues/4791
Then you can install Docker:
sudo dnf install docker-ce --nobest -y
and
sudo systemctl daemon-reload
sudo systemctl start docker
sudo systemctl enable docker