title: Nginx cannot write into access.log
body: <p>When nginx start, it creates log file "access.log" with 0 size. But no log are written in it.
  error.log works fine.</p>
  
  <p>nginx.conf:</p>
  
  <pre><code>http {
      access_log /usr/local/webserver/nginx/logs/access.log combined;
      ....
  }
  </code></pre>
  
  <p>The logs file is:</p>
  
  <pre><code>-rw-r--r--  1 root root    0 Mar  4 00:54 access.log
  -rw-r--r--  1 root root 3903 Mar  4 00:54 error.log
  </code></pre>
  
  <p>I am totally confused. @_@</p>
  
  <p>Is it a permission issue?</p>
  
  <p>However, in the later part of nginx.conf, in the server {} section, the access_log works! Why http {} section not working?</p>