How to fix docker: Got permission denied issue

docker-permission.txt

If you want to run docker as non-root user then you need to add it to the docker group.
1. Create the docker group if it does not exist
  $ sudo groupadd docker
2. Add your user to the docker group.
  $ sudo usermod -aG docker $USER
3. Run the following command or Logout and login again and run (that doesn't work you may need to reboot your machine first)
  $ newgrp docker
4. Check if docker can be run without root
  $ docker run hello-world
  
source: https://stackoverflow.com/questions/48957195/how-to-fix-docker-got-permission-denied-issue  

If you want to run docker as non-root user then you need to add it to the docker group.

1. Create the docker group if it does not exist
   $ sudo groupadd docker
2. Add your user to the docker group.
   $ sudo usermod -aG docker $USER
3. Run the following command or Logout and login again and run (that doesn't work you may need to reboot your machine first)
   $ newgrp docker
4. Check if docker can be run without root
   $ docker run hello-world

source: https://stackoverflow.com/questions/48957195/how-to-fix-docker-got-permission-denied-issue