docker:无法连接到位于 unix:///var/run/docker.sock 的 Docker 守护进程。 docker 守护进程是 运行 吗?

docker:Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

我正在通过 Visual Studio 代码(VScode,版本 1.66)远程连接到学校服务器(Ubuntu 20.04.2 LTS)以执行一些任务,今天我按照 docker.com (https://docs.docker.com/engine/install/ubuntu/) 在 Ubuntu.

上安装 docker 引擎

当我 sudo docker run hello-world 验证 Docker 引擎在所有步骤后由 运行 hello-world 图像正确安装时,它显示如下错误:

docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
See 'docker run --help'.

之后我查看 docker version,它显示

Client: Docker Engine - Community
 Version: 20.10.14
 API version: 1.41
 Go version: go1.16.15
 Git commit: a224086
 Built: Thu Mar 24 01:48:02 2022
 OS/Arch: linux/amd64
 Context: default
 Experimental: true
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

再看sudo docker info,显示

Client:
 Context: default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Docker Buildx (Docker Inc., v0.8.1-docker)
  scan: Docker Scan (Docker Inc., v0.17.0)

Server:
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
errors pretty printing info

我卸载重装后docker按照这个教程,还是报这样的错误,我想我需要按照docker的服务器端,但是我不知道怎么办做吗?

这是历史:

root@yp:~# sudo apt-get remove docker docker-engine docker.io containerd runc
...
root@yp:~# sudo apt-get update
...
root@yp:~# sudo apt-get install \
>     ca-certificates \
>     curl \
>     gnupg \
>     lsb-release
...
root@yp:~# curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
...
root@yp:~# echo \
>   "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
>   $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
...
root@yp:~# sudo apt-get update
...
root@yp:~# sudo apt-get install docker-ce docker-ce-cli containerd.io
...
root@yp:~# sudo docker run hello-world
docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
See 'docker run --help'.

您应该首先在 systemctl

中启动并启用 docker
 systemctl start docker
 systemctl enable docker