title: nginx unknown directive health_check
body: <p>I am new to nginx. I am using - </p>
  
  <pre><code>health_check uri=/some/uri
  </code></pre>
  
  <p>but on running the test with this command - </p>
  
  <pre><code> sudo /usr/sbin/nginx -t -c /etc/nginx/nginx.conf
  </code></pre>
  
  <p>I get the following error - </p>
  
  <pre><code>nginx: [emerg] unknown directive "health_check" in /etc/nginx/sites-enabled/abc.conf:121
  </code></pre>
  
  <p>Can someone tell what is wrong here..? I have used apache2 to do all jing-bang but I do not have much knowledge about nginx..</p>