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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta name="generator" content="HTML Tidy, see www.w3.org" /><title>System Accounts</title><meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" /><link rel="HOME" title="FreeBSD Handbook" href="index.html" /><link rel="UP" title="Users and Basic Account Management" href="users.html" /><link rel="PREVIOUS" title="The Superuser Account" href="users-superuser.html" /><link rel="NEXT" title="User Accounts" href="users-user.html" /><link rel="STYLESHEET" type="text/css" href="docbook.css" /></head><body class="SECT1" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#840084"alink="#0000FF"><div class="NAVHEADER"><table summary="Header navigation table" width="100%" border="0" cellpadding="0"cellspacing="0"><tr><th colspan="3" align="center">FreeBSD Handbook</th></tr><tr><td width="10%" align="left" valign="bottom"><a href="users-superuser.html"accesskey="P">Prev</a></td><td width="80%" align="center" valign="bottom">Chapter 13 Users and Basic AccountManagement</td><td width="10%" align="right" valign="bottom"><a href="users-user.html"accesskey="N">Next</a></td></tr></table><hr align="LEFT" width="100%" /></div><div class="SECT1"><h1 class="SECT1"><a id="USERS-SYSTEM" name="USERS-SYSTEM">13.4 System Accounts</a></h1><p>System users are those used to run services such as DNS, mail, web servers, and soforth. The reason for this is security; if all services ran as the superuser, they couldact without restriction.</p><p>Examples of system users are <tt class="USERNAME">daemon</tt>, <ttclass="USERNAME">operator</tt>, <tt class="USERNAME">bind</tt> (for the Domain NameService), and <tt class="USERNAME">news</tt>. Often sysadmins create <ttclass="USERNAME">httpd</tt> to run web servers they install.</p><p><tt class="USERNAME">nobody</tt> is the generic unprivileged system user. However, itis important to keep in mind that the more services that use <ttclass="USERNAME">nobody</tt>, the more files and processes that user will becomeassociated with, and hence the more privileged that user becomes.</p></div><div class="NAVFOOTER"><hr align="LEFT" width="100%" /><table summary="Footer navigation table" width="100%" border="0" cellpadding="0"cellspacing="0"><tr><td width="33%" align="left" valign="top"><a href="users-superuser.html"accesskey="P">Prev</a></td><td width="34%" align="center" valign="top"><a href="index.html"accesskey="H">Home</a></td><td width="33%" align="right" valign="top"><a href="users-user.html"accesskey="N">Next</a></td></tr><tr><td width="33%" align="left" valign="top">The Superuser Account</td><td width="34%" align="center" valign="top"><a href="users.html"accesskey="U">Up</a></td><td width="33%" align="right" valign="top">User Accounts</td></tr></table></div><p align="center"><small>This, and other documents, can be downloaded from <ahref="ftp://ftp.FreeBSD.org/pub/FreeBSD/doc/">ftp://ftp.FreeBSD.org/pub/FreeBSD/doc/</a>.</small></p><p align="center"><small>For questions about FreeBSD, read the <ahref="http://www.FreeBSD.org/docs.html">documentation</a> before contacting <<ahref="mailto:questions@FreeBSD.org">questions@FreeBSD.org</a>>.<br />For questions about this documentation, e-mail <<ahref="mailto:doc@FreeBSD.org">doc@FreeBSD.org</a>>.</small></p></body></html>⌨️ 快捷键说明
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