Docker command can't connect to Docker daemon
You need to add your current user to the docker group as follows:
sudo usermod -aG docker $(whoami)
then logout & login again into the system or restart the system.
test by docker version
for further info how to install docker-engine follow docker documentation
Add the user to the docker group
Add the docker group if it doesn't already exist:
sudo groupadd docker
Add the connected user "${USER}" to the docker group:
sudo gpasswd -a ${USER} docker
Restart the Docker daemon:
sudo service docker restart
Either do a
newgrp docker
or log out/in to activate the changes to groups.
Usually, the following command does the trick:
sudo service docker restart
This, instead of docker start
for the cases where Docker seems to already be running.
If that works then, as suggested and in another answer and on this GitHub issue, if you haven't added yourself in the docker group do it by running:
sudo usermod -aG docker <your-username>
And you're most likely good to go.
As for anybody else bumping into this, in some OS's docker doesn't start right after you install it and, as a result, the same can't connect to daemon message
appears. In this case you can first verify that Docker is indeed not running by checking the status of your docker service by executing:
sudo service docker status
If the output looks something like: docker stop/waiting
instead of docker start/running, process 15378
then it obviously means Docker is not active. In this case make sure you start it with:
sudo service docker start
And, as before, you'll most likely be good to go.