Prepare your Docker environment

Test Docker version

1. Run docker --version and ensure that you have a supported version of Docker:

   docker --version

   Otput:
   Docker version 17.12.0-ce, build c97c6d6

2. Run docker info or (docker version without --) to view even more details about your docker installation:

   docker info

   Output:
   
   Containers: 0 
   Running: 0 
   Paused: 0 
   Stopped: 0 
   Images: 0 
   Server Version: 17.12.0-ce 
   Storage Driver: overlay2 ...

3. To list the image in a docker:

   docker image ls

4. List the hello-world container (spawned by the image) which exits after displaying its message. If it were still running, you would not need the --all option:

   docker container ls --all

   Output:

   CONTAINER ID     IMAGE           COMMAND      CREATED            STATUS
   54f4984ed6a8     hello-world     "/hello"     20 seconds ago     Exited (0) 19 seconds ago

5. Test that your installation works by running the simple Docker image, hello-world:

   docker run hello-world

   Output:

   Hello from Docker!
   This message shows that your installation appears to be working correctly.