Cannot Connect to The Docker Daemon at Unix:///Var/Run/Docker.Sock

docker：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Just solved a similar issue with this

The first thing you should do is to have Docker Desktop installed on your pc, of which you can get here https://docs.docker.com/desktop/windows/wsl/

You should also enable wsl2,
Just going through the documentation from the link above should be enough.

Make sure you go into Settings>Resources>WSL Integration and enable Ubuntu-20.04 or any other distro you are using.

Also make sure Settings>General>Use the WSL 2 based engine... box is checked

docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? Linux Bash Shell on windows 10

It seems like you wont be able to use docker in Windows 10 family, since docker Desktop requires specific Windows version, as said in official documentation.

System Requirements

Windows 10 64-bit: Pro, Enterprise, or Education (Build 15063 or later).

What you can try is to run linux-based virtual machine on you Windows host, and run docker inside of it. But even if you succeeded, you will lose all advantages of the docker in resources consumption.

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? inside a Dockerfile

You can't (*) run Docker inside Docker containers or images. You can't (*) start background services inside a Dockerfile. As you say, commands like systemctl and service don't (*) work inside Docker anywhere. And in any case you can't use any host-system resources, including the host's Docker socket, from anywhere in a Dockerfile.

You need to redesign this Dockerfile so that it only installs the software and makes no attempt to start it. Ideally a container would start only a single server, and would run it in the foreground as its CMD; otherwise you might depend on things like supervisord to have multiple servers if you must. If your application heavily relies on being able to start things in Docker, you might find it much easier to install in a virtual machine.

(*) Technically there are ways to do all of these things, but they're all tricky and complicated and have implications (up to potentially giving your container unrestricted root access over the host, and your container startup actively reconfiguring some low-level host details).

Custom Gitlab Runner Failing - Cannot connect to the Docker daemon

Your DOCKER_HOST variable value is not correct.

Use DOCKER_HOST: "tcp://docker:2375"

adding volumes = ["/var/run/docker.sock /var/run/docker.sock" "/cache"] in /etc/gitlab-runner/config.toml

I would recommend removing the volume mount of /var/run/docker.sock from the runner configuration here. This is not necessary when leveraging the docker:dind service container method. Though, it technically won't cause issues.

privileged: true in /etc/gitlab-runner/config.toml

[...]

used DOCKER_TLS_CERTDIR: '' in gitlab-ci.yml as variable

These changes are good, keep these changes.

This error may indicate that the docker daemon is not running

On Linux you should check the daemon status by systemctl status docker.service, then:

sudo systemctl enable docker.service
sudo systemctl enable docker.socket

sudo systemctl start docker.socket
sudo systemctl start docker.service

On Windows you should check its status by the Windows Service Manager.

Pycharm 2022 cannot connect to the docker service. It does not find it

Appart from the official "solution" from Intelillj I find it easier with this workaround:

1. Help -> Find Action -> Registry
2. Disable python.use.targets.api
3. Try to configure the interpreter again

There is an official solution from Intelillj that you can check here:

https://intellij-support.jetbrains.com/hc/en-us/community/posts/6870884026898-Pycharm-2022-2-upgrade-and-Docker-issues

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