Ubuntu 系统，原本通过apt安装了docker-ce。 前两天想用一下desktop，又装了一个desktop。

不知道是不是安装有问题，结果导致docker client连不上docker daemon了

➜  ~ docker ps
Cannot connect to the Docker daemon at unix:///home/wuguozhang/.docker/desktop/docker.sock. Is the docker daemon running?

docker daemon是正常启动了，问题显而易见，是docker cli没有连到正确的socket文件。
首先确认 daemon 的socket文件在哪里， 直接systemctl就可以找到

➜  ~ systemctl list-sockets 
LISTEN                       UNIT                            ACTIVATES               
/dev/rfkill                  systemd-rfkill.socket           systemd-rfkill.service
/run/acpid.socket            acpid.socket                    acpid.service
/run/avahi-daemon/socket     avahi-daemon.socket             avahi-daemon.service
/run/cups/cups.sock          cups.socket                     cups.service
/run/dbus/system_bus_socket  dbus.socket                     dbus.service
/run/docker.sock             docker.socket                   docker.service
/run/initctl                 systemd-initctl.socket          systemd-initctl.service
/run/snapd-snap.socket       snapd.socket                    snapd.service
/run/snapd.socket            snapd.socket                    snapd.service
/run/systemd/fsck.progress   systemd-fsckd.socket            systemd-fsckd.service
/run/systemd/journal/dev-log systemd-journald-dev-log.socket systemd-journald.service
/run/systemd/journal/socket  systemd-journald.socket         systemd-journald.service
/run/systemd/journal/stdout  systemd-journald.socket         systemd-journald.service
/run/systemd/journal/syslog  syslog.socket                   rsyslog.service
/run/udev/control            systemd-udevd-control.socket    systemd-udevd.service
/run/uuidd/request           uuidd.socket                    uuidd.service
audit 1                      systemd-journald-audit.socket   systemd-journald.service
kobject-uevent 1             systemd-udevd-kernel.socket     systemd-udevd.service

18 sockets listed.
Pass --all to see loaded but inactive sockets, too.

找到是在 /run/docker.sock ，那么问题就变成怎么让 docker cli 连上。
我找了半天，没找到docker cli的配置是在哪里，官网文档也没找到。
最后还是得靠 -h 指令

➜  ~ docker -h
Flag shorthand -h has been deprecated, please use --help

Usage:  docker [OPTIONS] COMMAND

A self-sufficient runtime for containers

Options:
      --config string      Location of client config files (default "/home/wuguozhang/.docker")
  -c, --context string     Name of the context to use to connect to the daemon (overrides DOCKER_HOST env var and default context set with "docker context use")
  -D, --debug              Enable debug mode
  -H, --host list          Daemon socket(s) to connect to
  -l, --log-level string   Set the logging level ("debug"|"info"|"warn"|"error"|"fatal") (default "info")
      --tls                Use TLS; implied by --tlsverify
      --tlscacert string   Trust certs signed only by this CA (default "/home/wuguozhang/.docker/ca.pem")
      --tlscert string     Path to TLS certificate file (default "/home/wuguozhang/.docker/cert.pem")
      --tlskey string      Path to TLS key file (default "/home/wuguozhang/.docker/key.pem")
      --tlsverify          Use TLS and verify the remote
  -v, --version            Print version information and quit

(default "/home/wuguozhang/.docker")
最终成功找到一个meta.json文件里有设置

cat /home/wuguozhang/.docker/contexts/meta/fe9c6bd7a66301f49ca9b6a70b217107cd1284598bfc254700c989b916da791e/meta.json 
{"Name":"desktop-linux","Metadata":{},"Endpoints":{"docker":{"Host":"unix:///home/wuguozhang/.docker/desktop/docker.sock","SkipTLSVerify":false}}}

最后修改这个文件，把unix://xxxxx更好之后，就全部都正常了