Non-root users join docker groups without sudo

Server environment: Ubuntu16.04 / centos7.6.1810, Docker version 18.09.3

1. Log in to the server as user sudo, for example, user domi

2. Before creating a docker user group, check whether the docker group exists in the user group. If the docker group exists, you do not need to create it again

sudo cat /etc/group | grep docker
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3. Create a docker group and add the corresponding users to the group (999 is the group ID, you can not specify).

sudo groupadd -g 999 docker
sudo usermod -aG docker domi
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4. Check whether the creation is successful

cat /etc/group | grep domi
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5. Log out of the current user login state and then log in again for permission to take effect or restart the Docker-daemon

sudo service docker restart   # Ubuntu
sudo systemctl restart docker  # Centos system
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6. Confirm that you can directly run the Docker command, execute the Docker command

docker  ps
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If the following prompt is displayed, the /var/run/docker.sock permission is required

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.39/info: dial Unix/var/run/docker. The sock: connect: permission denied

sudo chmod a+rw /var/run/docker.sock
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