title: nginx : access.log and error.log file empty
body: <p>I have just installed nginx on Ubuntu 14.04 using the command</p>
  
  <pre><code>sudo apt-get install nginx
  </code></pre>
  
  <p>Now, when I open my browser and type in the address <code>localhost</code> then I am correctly shown the "Welcome to nginx" page. Also, I checked the config file located in <code>/etc/nginx/nginx.conf</code> and found the following log settings:</p>
  
  <pre><code>access_log /var/log/nginx/access.log;
  error_log /var/log/nginx/error.log;
  </code></pre>
  
  <p>However, when I check these two files, both are empty. I have opened the <code>localhost</code> page multiple times but still the log files are empty. What might be wrong with my setup ?</p>