title: Ansible docker invalid character %
body: <p>I am writing some ansible to automate my docker deployments.
  I am trying to set an env variable to be % but I get this error: </p>
  
  <pre><code>    ERROR! Syntax Error while loading YAML.
    found character that cannot start any token
  
  The error appears to have been in '/vagrant/roles/zoneminder_docker/tasks/main.yml': line 21, column 24, but may
      be elsewhere in the file depending on the exact syntax problem.
  
      The offending line appears to be:
  
            MYSQL_ROOT_PASSWORD: mysqlpsswd
            MYSQL_ROOT_HOST: %
                             ^ here
  </code></pre>
  
  <p>Is there any way to escape this character? As if I exclude this line, my deployment fails.</p>