I have installed docker on ubuntu 14.04, it told me installed successfully. Then I entered sudo docker version
, it returned
Client: Version: 1.9.1 API version: 1.21 Go version: go1.4.2 Git commit: a34a1d5 Built: Fri Nov 20 13:12:04 UTC 2015 OS/Arch: linux/amd64 Cannot connect to the Docker daemon. Is the docker daemon running on this host?
I entered sudo service docker status
, I got
docker start/running, process 8063
I tried sudo docker images
and sudo docker info
, I got the same reply:
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
I do not know why it returned this, I tried to pull ubuntu using sudo docker pull ubuntu
, and got
Using default tag: latest Cannot connect to the Docker daemon. Is the docker daemon running on this host?
Please tell me how can I solve this problem, how can I pull and run docker image. And is docker -d
the same as docker deamon
?
Check what's displayed under “Active.” If you see active (running) in green, the Docker daemon is running and your containers should be up. An active state of inactive indicates the service has stopped. Try to bring it up by running sudo systemctl start docker .
Conclusion. The Docker daemon is a backend service of Docker that controls the Docker container. To resolve the Docker daemon is not running error, you first need to verify if the service of Docker Desktop is running or not. If the service is running then update the WSL package.
You need to add your current user to docker
group like following:
sudo usermod -aG docker <your username>
Also, you can use USER
environment variable like:
sudo usermod -aG docker $USER
Then restart the system. As the docker documentation says:
The docker daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user root and other users can access it with
sudo
. For this reason, docker daemon always runs as the root user.To avoid having to use
sudo
when you use thedocker
command, create a Unix group calleddocker
and add users to it. When the docker daemon starts, it makes the ownership of the Unix socket read/writable by thedocker
group.
If adding user to the docker
group doesn't work then try restarting the service:
sudo service docker restart
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