title: How to send syslog to graylog
body: <p>we have many Centos clients (Centos 5-7). I want that all clients send logs via syslog to the graylog server. This works on clients where rsyslog is installed. But the old clients don't have rsyslog. They use syslog. </p>
  
  <p>What should I change in the <code>/etc/syslog.conf</code> file to make it work?
  Thanks for any help.</p>