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The error message tells you that your current user can't access the docker engine, because you're lacking permissions to access the unix socket to communicate with the engine.
As a temporary solution, you can use
sudo to run the failed command as root.
However it is recommended to fix the issue by adding the current user to the
docker group :
Run this command in your favourite shell and then completely log out of your account and log back in (if in doubt, reboot!):
sudo usermod -a -G docker $USER
sudo usermod -a -G docker $USER
After doing that, you should be able to run the command without any issues. Run
docker run hello-world as a normal user
in order to check if it works. Reboot if the issue still persists.
Logging out and logging back in is required because the group change will not have an effect unless your session is closed.Control Docker Service
Now you have Docker installed onto your machine, start the Docker service in case if it is not started automatically after the installation
# systemctl start docker # systemctl enable docker
Once the service is started, verify your installation by running the following command.
# docker run -it centos echo Hello-World
Let's see what happens when we run " docker run " command. Docker starts a container with centos base image since we are running this centos container for the first time, the output will look like below.
Unable to find image 'centos:latest' locally Trying to pull repository docker.io/centos ... 0114405f9ff1: Download complete 511136ea3c5a: Download complete b6718650e87e: Download complete 3d3c8202a574: Download complete Status: Downloaded newer image for docker.io/centos:latest Hello-World
Docker looks for centos image locally, and it is not found, it starts downloading the centos image from Docker registry. Once the image has been downloaded, it will start the container and echo the command " Hello-World " in the console which you can see at the end of the output.
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Last modified: March 12, 2019