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

Example 1: 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

Example 2: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

sudo dockerd

Example 3: 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

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