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moby--moby/docs/getstarted/step_three.md
Victoria Bialas 0254c12e1e surfacing Learn by example topics to top level of Docker Engine docs 
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WIP: merging 3 getting started tutorials into one to cover all platforms, added new files

fixing broken images and links in 3-in-1 getting started, re-wrote story flow, linked to Toolbox, d4mac,d4win

Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
2016-06-14 21:08:44 -07:00

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Find and run the whalesay image

People all over the world create Docker images. You can find these images by browsing the Docker Hub. In this next section, you'll search for and find the image you'll use in the rest of this getting started.

Step 1: Locate the whalesay image

  1. Open your browser and browse to the Docker Hub.

    Browse Docker Hub

    The Docker Hub contains images from individuals like you and official images from organizations like RedHat, IBM, Google, and a whole lot more.

  2. Click Browse & Search.

    The browser opens the search page.

  3. Enter the word whalesay in the search bar.

    Browse Docker Hub

  4. Click on the docker/whalesay image in the results.

    The browser displays the repository for the whalesay image.

    Browse Docker Hub

    Each image repository contains information about an image. It should include information such as what kind of software the image contains and how to use it. You may notice that the whalesay image is based on a Linux distribution called Ubuntu. In the next step, you run the whalesay image on your machine.

Step 2: Run the whalesay image

Make sure Docker is running. On Docker for Mac and Docker for Windows, this is indicated by the Docker whale showing in the status bar.

  1. Open a command-line terminal.

  2. Type the docker run docker/whalesay cowsay boo command and press RETURN.

    This command runs the whalesay image in a container. Your terminal should look like the following:

     $ docker run docker/whalesay cowsay boo
 Unable to find image 'docker/whalesay:latest' locally
 latest: Pulling from docker/whalesay
 e9e06b06e14c: Pull complete
 a82efea989f9: Pull complete
 37bea4ee0c81: Pull complete
 07f8e8c5e660: Pull complete
 676c4a1897e6: Pull complete
 5b74edbcaa5b: Pull complete
 1722f41ddcb5: Pull complete
 99da72cfe067: Pull complete
 5d5bd9951e26: Pull complete
 fb434121fc77: Already exists
 Digest: sha256:d6ee73f978a366cf97974115abe9c4099ed59c6f75c23d03c64446bb9cd49163
 Status: Downloaded newer image for docker/whalesay:latest
  _____
 < boo >
  -----
     \
      \
       \     
                     ##        .            
               ## ## ##       ==            
            ## ## ## ##      ===            
        /""""""""""""""""___/ ===        
   ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~   
        \______ o          __/            
         \    \        __/             
           \____\______/

    The first time you run a software image, the docker command looks for it on your local system. If the image isn't there, then docker gets it from the hub.

  3. While still in the command line terminal, type docker images command and press RETURN.

    The command lists all the images on your local system. You should see docker/whalesay in the list.

     $ docker images
 REPOSITORY           TAG         IMAGE ID            CREATED            VIRTUAL SIZE
 docker/whalesay      latest      fb434121fc77        3 hours ago        247 MB
 hello-world          latest      91c95931e552        5 weeks ago        910 B

    When you run an image in a container, Docker downloads the image to your computer. This local copy of the image saves you time. Docker only downloads the image again if the image's source changes on the hub. You can, of course, delete the image yourself. You'll learn more about that later. Let's leave the image there for now because we are going to use it later.

  4. Take a moment to play with the whalesay container a bit.

    Try running the whalesay image again with a word or phrase. Try a long or short phrase. Can you break the cow?

     $ docker run docker/whalesay cowsay boo-boo
  _________
 < boo-boo >
  ---------
     \
      \
       \     
                     ##        .            
               ## ## ##       ==            
            ## ## ## ##      ===            
        /""""""""""""""""___/ ===        
   ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~   
        \______ o          __/            
         \    \        __/             
           \____\______/

Where to go next

On this page, you learned to search for images on Docker Hub. You used your command line to run an image. Think about it, effectively you ran a piece of Linux software on your Mac computer. You learned that running an image copies it on your computer. Now, you are ready to create your own Docker image. Go on to the next part to build your own image.