title: Dockerfile for Jenkins
body: <p>I'm absolutely new in Docker and Jenkins and I want to try to ask you, maybe you are able to help me.</p>
  
  <p>I want to create a Dockerfile with all necessarily Jenkins parts to be able to create an automated task for checking out a github.</p>
  
  <p>So firstly I found the public dockerfile on github (<a href="https://github.com/jenkinsci/docker/blob/master/Dockerfile" rel="nofollow noreferrer">https://github.com/jenkinsci/docker/blob/master/Dockerfile</a>), but it includes a lot of parameters and I'm not sure, if is necessarily to use the whole Dockerfile. </p>
  
  <p>Firstly, can you just give me an advice, how to modify the dockerfile? Or is recommended to use the original Dockerfile (URL is upper)?</p>
  
  <p>Thank you for any advice, guys, have a nice day.</p>