Cannot connect to the Docker daemon at unix var run docker sock Is the docker daemon running

It seems the docker service is not running in your system. You need to start the docker service using the below command.

    $ systemctl start docker

To Resolve the “cannot connect to the Docker daemon” Error, you can use:

• Method 1: Check the Docker Engine.
  
• Method 2: Assign Ownership to the Docker Unix Socket.
  
• Method 3: Check the Ownership of Used Files.
  
• Method 4: Add Your User to the Docker Group.
  
• Method 5: Add Environment Tables on OS X.