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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Singleton Template"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90505">90505</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Singleton Template
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>systemd
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>general
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>systemd-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>contact@leesah.name
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>systemd-bugs@lists.freedesktop.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Systemd must provide an option in Unit configuration to indicate a template to
be singleton.

There are use cases where a template should have only one instance at a time,
and whenever it is instantiated, the existing instance must be stopped first.

My own case is described in this question on Stackoverflow:
<a href="http://stackoverflow.com/questions/30208805/systemd-how-to-write-a-singleton-unit-template">http://stackoverflow.com/questions/30208805/systemd-how-to-write-a-singleton-unit-template</a></pre>
        </div>
      </p>
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