docker命令

root@ubuntu:~# docker info --format "{{json .Runtimes}}"
{"kata-runtime":{"path":"/usr/local/bin/kata-runtime"},"runc":{"path":"runc"}}
root@ubuntu:~# 

root@ubuntu:/opt/gopath/src/github.com# docker version
Client: Docker Engine - Community
 Version:           19.03.13
 API version:       1.40
 Go version:        go1.13.15
 Git commit:        4484c46
 Built:             Wed Sep 16 17:03:14 2020
 OS/Arch:           linux/arm64
 Experimental:      false
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
root@ubuntu:/opt/gopath/src/github.com# docker info
Client:
 Debug Mode: false

Server:
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
errors pretty printing info
root@ubuntu:/opt/gopath/src/github.com# docker version
Client: Docker Engine - Community
 Version:           19.03.13
 API version:       1.40
 Go version:        go1.13.15
 Git commit:        4484c46
 Built:             Wed Sep 16 17:03:14 2020
 OS/Arch:           linux/arm64
 Experimental:      false
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
root@ubuntu:/opt/gopath/src/github.com# systemctl show docker
Type=notify
Restart=always
NotifyAccess=main
RestartUSec=2s
TimeoutStartUSec=infinity
TimeoutStopUSec=infinity
RuntimeMaxUSec=infinity
WatchdogUSec=0
WatchdogTimestampMonotonic=0
PermissionsStartOnly=no
RootDirectoryStartOnly=no
RemainAfterExit=no
GuessMainPID=yes
MainPID=0
ControlPID=0
FileDescriptorStoreMax=0
NFileDescriptorStore=0