Answers for "Cannot connect to the Docker daemon at unix:///var/run/docker.sock."

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

sudo su
systemctl start docker
systemctl enable docker
systemctl restart docker

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

sudo chmod 666 /var/run/docker.sock

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

sudo dockerd