title: Unable to run build for gitlab-ci
body: <p>Gitlab unable to complete gitlab-ci build for the project. Logs showing it cannot connect to docker endpoint.</p>
  
  <blockquote>
    <p>gitlab-ci-multi-runner 0.7.1 (ee7a001) Using Docker executor with
    image ruby:2.1 ... Pulling docker image mysql:latest ...</p>
    
    <p>ERROR: Build failed with: cannot connect to Docker endpoint</p>
  </blockquote>
  
  <p>Please provide some solution.</p>