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<div style="text-align:center">
    <a href="0560daemons.php">
    <span class="text_head0">认识系统服务<span class="text_head_en"> daemons</span></span></a><br />
</div>
    <div style="text-align:left">
        <a href="0560daemons.php?thisscreen=800x600"><!--切换解析度为 800x600--></a>
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        <span class="text_history">最近更新日期∶2005/10/12</span>
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<!-- 本文的档头部分 -->
<table class="head1" summary="排版∶文章档头的说明"><tr><td class="head1">
	在 Unix-Like 的系统中，常常听到这个字眼∶ daemons ！那么什么是传说中的 daemons 
	呢？这些 daemon 放在什么地方？他的功能是什么？该如何启动这些 daemons ？又如何有效的将这些
	 daemon 管理妥当！？此外，要如何视察这些 daemons 开了多少个 ports ？又这些 ports 
	要如何关闭？还有还有，晓得你的系统的这些 port 各代表的是什么服务吗？
	这些都是最基础需要注意的呢！尤其是在架设网站之前，这里个观念就显的更重要了。
</td></tr></table><br>


<!-- 本文的连结区部分 -->
<div class=block1>
<span class="text_h1">
1. <a href="#daemon">什么是 daemon 与服务 (service)</a>∶<br>
	<span class=text_h2>
	    1.1 <a href="#daemon_type">daemon 的主要分类</a><br>
	    1.2 <a href="#services">与服务有关的埠口对应资料∶/etc/services</a><br>
	    1.3 <a href="#name_rule">命名规则</a><br>
	    1.4 <a href="#Whereisdaemon">系统的 Daemons 放在哪里</a>∶ <a href="#init.d">/etc/init.d/</a>,
		<a href="#xinetd.conf">/etc/xinetd.conf</a>,
		<a href="#xinetd.d">/etc/xinetd.d</a><br>
	    1.5 <a href="#daemon_start">daemon 的启动方式</a>∶<a href="#service">service</a><br>
	</span>
2. <a href="#superd">解析 super daemon 的设定档</a><br>
	<span class=text_h2>
	    2.1 <a href="#xinetd">主要预设参数档 xinetd.conf 及相关参数原理</a><br>
	    2.2 <a href="#superd_telnet">一个简单的 telnet 范例设定</a><br>
	</span>
3. <a href="#tcp_wrappers">TCP_Wrappers</a>∶<span class=text_h2>/etc/hosts.allow, /etc/hosts.deny</span><br>
4. <a href="#open_services">系统开启的服务</a>∶<br>
	<span class=text_h2>
	    4.1 <a href="#opened">观察系统启动的服务∶</a><br>
	    4.2 <a href="#starting_daemon">设定开机后立即启动服务的方法</a>∶
		<a href="#chkconfig">chkconfig</a>, <a href="#ntsysv">ntsysv</a><br>
	    4.3 <a href="#illustrations">各个服务的简单说明</a><br>
	</span>
5. <a href="#FAQ">本章习题练习</a><br />
<span class=text_h2>
6. <a href="http://phorum.vbird.org/viewtopic.php?t=23894"
    target="_blank">针对本文的建议∶http://phorum.vbird.org/viewtopic.php?t=23894</a>
</span>
</span>
</div>


<!-- 本文的正式部分 -->
<hr><a NAME="daemon"></a><img src="images/penguin-m.gif" alt="大标题的图示" height="34" width="25" align="middle" /><span class=text_h1>什么是 daemon 与服务 (service)</span>
<div class=block1>
	如果您常常上网去查看一些资料的话，尤其是关于 Unix-Like 的相关作业系统，如
	FreeBSD, Unix, Linux 等等，应该会常常听到 daemons 这个字眼，那么 daemon
	是什么东西呀！？怎么这么常被见到？呵呵，Daemon 的字面上的意思就是『守护神、恶魔？』还真是有点奇怪呦！
	^_^""<br><br>
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