I'm using docker in wsl2. I followed this guide for the setup and everything covered therein seems to work.
Now when I try to build a docker image in wsl2 with docker build . I get the error Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
I assume that I have to tell docker build on which IP the docker host is running (similar to docker -H 172.20.5.64 run --rm hello-world), but I have no idea how to do this?
I had the same problem, here is the solution, that worked for me:
I had to stop docker
sudo docker service stop
I had to start docker daemon
sudo dockerd
I had to stop docker daemon by pressing ctrl + z
Than i had to move the process in the background
bg %1
Then I was able to restart docker
sudo docker service start
After that, I did no longer get an error.
I hope this works for you too.
Related
I have an ubuntu 18.04 running on a metal server. My docker working good but one day i can not build new docker image, my build script hang without showing any error (the script working good before).
I tried to restart docker engine by: sudo systemctl restart docker but docker service can not active, the command: sudo systemcle stop docker not working too.
Then i rebooted my server then docker go back.
What log files should i check to know what make my docker service hang?
You can view the docker service logs using:
sudo journalctl -fu docker.service
I want to install a package by docker, following instruction in: https://dynamic-fba.readthedocs.io/en/latest/installation.html#installing-from-source
I installed ubuntu and then Docker. But I don't understand what I need to do next. There it is said to type (docker run -it -v ${PWD}:/opt/examples davidtourigny/dfba python3 examples/example1.py). I excatly type it in ubuntu but I get this error:
docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
See 'docker run --help'.
Using alternative method of dockerfile, I also get error. I don't know how to make use of make build, but used build instead following tutorials on the web.
It's my first time using Docker and I don't know what to do.
Any help is very appreciated.
The Docker application has two components, a back-end server, and a front-end cli. This way you can do cool stuff like control Docker remotely or have orchestration frameworks that manage multiple Docker nodes over the network like Kubernates.
For security, the Docker back-end server is not exposed on a normal TCP port but it uses a unix domain socket (Linux magic that makes a file act as a port) at unix:///var/run/docker.sock.
When you execute docker run -it ... the cli application will attempt to connect to the backend server, but it looks like the daemon/server is probably not running.
Try to check that daemon is running. If you are using systemd you can check with
systemctl status docker and start if is stopped with systemctl start docker finally it might be good to enable it to make sure it starts automatically on reboot, you can do that with systemctl enable docker
Make sure to start docker service (you can either go for systemctl start docker or reboot your computer).
Once this is done, it is likely that your user has no permissions to communicate with Docker without sudo. Docker has privileged access to your hardware and therefore giving a user the docker group is required for security reasons.
Run:
sudo usermod -aG docker $USER
groupadd docker
docker run hello-world
This will add you to docker group, reflect the changes inmediately and run a sample image from Docker.
If all was okay, the last command should tell you "Hello from Docker".
I am new to docker and I exited the container's shell using exit and then used sudo docker stop ABC to kill the container. However, systemctl is-active docker still shows that docker is active. Is there any way to kill docker as well or would it remain active on my system forever?
I am using Ubuntu 18.
Docker daemon is supposed to keep running in background even if you exit and remove the container. This is because in case if you want to start a new container and docker daemon is not running then you won't be able to do it.
In case if you want to, then you can do sudo systemctl stop docker to stop the docker daemon completely. But after this if you do docker run -it someimage then you'll get an error - and to fix that you'll have to restart the docker daemon - sudo systemctl start docker
Hope that clarifies everything!
I have installed minikube and started it with it's default virtual machine so basically started the minikube with minikube start. In minikube vm which i have accessed through minikube ssh i am trying to build my dockerfile after mounting the local file system but it's showing error Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
I checked the ActiveState of docker through systemctl show --property ActiveState docker and it's showing failed but the docker version is showing me all the normal details like version built etc.
This is the statement that i am trying to execute : $ sudo docker build --file=Dockerfile --tag=demo-backend:latest --rm=true .
Should i install docker seperatley and if not how should access docker in VM which is already present in my system
It looks like somehow docker has not started properly.
Please try to execute sudo systemctl start docker and let me know if that was the issue.
EDIT:
Adding more info from the comments in order to supplement the answer:
I had to set the docker environment variable to local instance of
docker running in minikube through this command: eval $(minikube
docker-env) and then restart the docker and all of this has to done in
the same shell in which i aim to access the docker otherwise it does
not works. this made me acces the docker from minikube – rehan
I'm trying to run a Java application in a docker container. The application also communicates with docker. So I used docker:latest image and installed the openjdk. Now when I am running the container in interactive mode (privileged) I get the error Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? when I input any docker command on the command line.
I run the container with docker run --privileged -ti con_name
Have you gone through this link? In there it's mentioned that /var/lib/docker needs to be a volume. In your docker run command, you are not mentioning any volumes. You might give this page a read and make sure everything is correct.