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

Try:

[cloud_user@aryan1c ~]$ sudo systemctl start docker
[cloud_user@aryan1c ~]$ sudo systemctl enable docker 

[cloud_user@aryan1c ~]$ sudo systemctl start docker
[cloud_user@aryan1c ~]$ sudo systemctl enable docker
[cloud_user@aryan1c ~]$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[cloud_user@aryan1c ~]$