錯誤信息：
Failed to restart docker.service: Unit docker.socket failed to load: No such file or directory
解決辦法：(CentOS 7)
vi /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
接着運行命令：
systemctl unmask docker.service
systemctl unmask docker.socket
service docker restart
即可。
CentOS 7:
錯誤信息：
msg="no sockets found via socket activation: make sure the service was started by systemd"
解決辦法：
vi /lib/systemd/system/docker.service
[Unit] Description=Docker Application Container Engine Documentation=https://docs.docker.com After=network.target [Service] Type=notify # the default is not to use systemd for cgroups because the delegate issues still # exists and systemd currently does not support the cgroup feature set required # for containers run by docker #ExecStart=/usr/bin/dockerd #ExecStart=/usr/bin/docker daemon --tlsverify --tlscacert=/root/openssl/ca.pem --tlscert=/root/openssl/server-cert.pem --tlskey=/root/openssl/server-key.pem --registry-mirror=http://3cda3ca9.m.daocloud.io -H tcp://0.0.0.0:2376 #ExecStart=/usr/bin/docker daemon --registry-mirror=http://3cda3ca9.m.daocloud.io -H fd:// -H tcp://0.0.0.0:2375 #ExecStart=/usr/bin/dockerd --registry-mirror=http://3cda3ca9.m.daocloud.io ExecStart=/usr/bin/dockerd --registry-mirror=http://3cda3ca9.m.daocloud.io -H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375 ExecReload=/bin/kill -s HUP $MAINPID # Having non-zero Limit*s causes performance problems due to accounting overhead # in the kernel. We recommend using cgroups to do container-local accounting. LimitNOFILE=infinity LimitNPROC=infinity LimitCORE=infinity # Uncomment TasksMax if your systemd version supports it. # Only systemd 226 and above support this version. #TasksMax=infinity TimeoutStartSec=0 # set delegate yes so that systemd does not reset the cgroups of docker containers Delegate=yes # kill only the docker process, not all processes in the cgroup KillMode=process [Install] WantedBy=multi-user.target
systemctl daemon-reload
service docker restart