[docker] Docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock

If you may get errors like below,

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock

or

level=error msg="failed to dial gRPC: cannot connect to the Docker daemon. Is 'docker daemon' running on this host?: dial unix /var/run/docker.sock: connect: permission denied"

Just try to execute the following commands,

$ sudo su - jenkins
$ sudo usermod -a -G docker $USER
$ sudo chown jenkins:docker /var/run/docker.sock

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