尝试将当前用户添加到docker组:

sudo usermod -aG docker $USER

然后注销并重新登录。

我也有类似的问题。我不得不注销并再次登录到shell，因为我刚刚安装了Docker，下面的命令在我的环境中没有显示。

export DOCKER_HOST=127.0.0.1:4243 >> ~/.bashrc

I also had the same issue. The problem was in sockets allocated to docker-daemon and docker-client. First, permission was not set for the docker-client on docker.sock You can set it using "sudo usermod -aG docker $USER" Then check your bash file where the docker-client is running, For me it was on 0.0.0.0:2375, while docker-daemon was running on unix socket.(It was set in the configuration file of dockerd). Just comment the bash-line and it'll work fine. But if you want to make it work on TCP port instead of unix socket, change the configuration file of dockerd and set it on 0.0.0.0.2375 and keep the line in bash as it is if present or set it to 0.0.0.0:2375.

Linux

Linux安装后步骤文档揭示了以下步骤:

创建docker组。 Sudo groupadd docker 将用户添加到docker组。 sudo usermod -aG docker $(whoami) 退出并重新登录以确保docker以正确的权限运行。 码头工人开始。 Sudo服务docker启动

Mac OS X

正如Dayel Ostraco所说，有必要添加环境变量:

docker-machine start # Start virtual machine for docker
docker-machine env  # It's helps to get environment variables
eval "$(docker-machine env default)" # Set environment variables

docker-machine start命令输出注释来指导这个过程。

检查你是否正在使用Docker Machine:)

运行docker-machine env default就可以了。

因为根据文档:

Docker Machine is a tool that lets you install Docker Engine on virtual hosts, and manage the hosts with docker-machine commands. You can use Machine to create Docker hosts on your local Mac or Windows box, on your company network, in your data center, or on cloud providers like AWS or Digital Ocean. Using docker-machine commands, you can start, inspect, stop, and restart a managed host, upgrade the Docker client and daemon, and configure a Docker client to talk to your host. Point the Machine CLI at a running, managed host, and you can run docker commands directly on that host. For example, run docker-machine env default to point to a host called default, follow on-screen instructions to complete env setup, and run docker ps, docker run hello-world, and so forth.

https://docs.docker.com/machine/overview/

如果上面所有的解决方案都不起作用，你可以尝试检查/var/run/docker.sock的所有权:

ls -l /var/run/docker.sock

如果你不是所有者，那么使用以下命令改变所有者:

sudo chown *your-username* /var/run/docker.sock

然后，您可以继续尝试轻松地执行Docker命令