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📁 一份很好的linux入门资料
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<HTML><HEAD>  <TITLE>BBS水木清华站∶精华区</TITLE></HEAD><BODY><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER>发信人:&nbsp;czlong&nbsp;(紫龙),&nbsp;信区:&nbsp;Linux&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>标&nbsp;&nbsp;题:&nbsp;DNS&nbsp;HOWTO&nbsp;中译版-6&nbsp;<BR>发信站:&nbsp;BBS&nbsp;水木清华站&nbsp;(Sun&nbsp;Feb&nbsp;&nbsp;4&nbsp;15:47:58&nbsp;2001)&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>6.&nbsp;维护工作&nbsp;<BR>维持它的运作．&nbsp;&nbsp;<BR>&nbsp;<BR>维持它们的继续执行之外，对於&nbsp;named&nbsp;你还有个维护的任务得要做．那就是维持&nbsp;<BR>&nbsp;root.cache&nbsp;档案的更新．最简单的方法是使用&nbsp;dig&nbsp;程式，首先不加任何参数执&nbsp;<BR>行&nbsp;dig&nbsp;程式，你将会取得从你自己伺服器得到的&nbsp;root.cache．然後以&nbsp;dig&nbsp;&nbsp;<BR>@rootserver&nbsp;.&nbsp;ns&nbsp;查问所列出的根伺服器其中之一．你将会注意到这份输出看起&nbsp;<BR>来非常地像一个&nbsp;root.cache&nbsp;档案，除了一堆额外的数字以外．这些数字不会有什&nbsp;<BR>麽妨碍．把它存放到档案里(dig&nbsp;<A HREF="mailto:@e.root-servers.net">@e.root-servers.net</A>&nbsp;.&nbsp;ns&nbsp;&gt;root.cache.new)并&nbsp;<BR>且用它来取代原本旧的&nbsp;root.cache&nbsp;档案．&nbsp;&nbsp;<BR>&nbsp;<BR>取代了原先的档案之後要记得重新启动&nbsp;named&nbsp;程式．&nbsp;&nbsp;<BR>&nbsp;<BR>Al&nbsp;Longyear&nbsp;寄给我这个指令稿，它可以自动执行来更新&nbsp;named.cache，为它安装&nbsp;<BR>个&nbsp;crontab&nbsp;项目然後忘了它．这个指令稿假设你的电子邮件可以运作而且&nbsp;&nbsp;<BR>`hostmaster'&nbsp;这个邮件别名有定义．你应该修订它以便符合你的设定．&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>------------------------------------------------------------------------&nbsp;<BR>--------&nbsp;<BR>&nbsp;<BR>#!/bin/sh&nbsp;<BR>#&nbsp;<BR>#&nbsp;Update&nbsp;the&nbsp;nameserver&nbsp;cache&nbsp;information&nbsp;file&nbsp;once&nbsp;per&nbsp;month.&nbsp;<BR>#&nbsp;This&nbsp;is&nbsp;run&nbsp;automatically&nbsp;by&nbsp;a&nbsp;cron&nbsp;entry.&nbsp;<BR>#&nbsp;<BR>(&nbsp;<BR>&nbsp;echo&nbsp;&quot;To:&nbsp;hostmaster&nbsp;&lt;hostmaster&gt;&quot;&nbsp;<BR>&nbsp;echo&nbsp;&quot;From:&nbsp;system&nbsp;&lt;root&gt;&quot;&nbsp;<BR>&nbsp;echo&nbsp;&quot;Subject:&nbsp;Automatic&nbsp;update&nbsp;of&nbsp;the&nbsp;named.boot&nbsp;file&quot;&nbsp;<BR>&nbsp;echo&nbsp;<BR>&nbsp;<BR>&nbsp;export&nbsp;PATH=/sbin:/usr/sbin:/bin:/usr/bin:&nbsp;<BR>&nbsp;cd&nbsp;/var/named&nbsp;<BR>&nbsp;<BR>&nbsp;dig&nbsp;<A HREF="mailto:@rs.internic.net">@rs.internic.net</A>&nbsp;.&nbsp;ns&nbsp;&gt;root.cache.new&nbsp;<BR>&nbsp;<BR>&nbsp;echo&nbsp;&quot;The&nbsp;named.boot&nbsp;file&nbsp;has&nbsp;been&nbsp;updated&nbsp;to&nbsp;contain&nbsp;the&nbsp;following&nbsp;&nbsp;<BR>information:&quot;&nbsp;<BR>&nbsp;echo&nbsp;<BR>&nbsp;cat&nbsp;root.cache.new&nbsp;<BR>&nbsp;<BR>&nbsp;chown&nbsp;root.root&nbsp;root.cache.new&nbsp;<BR>&nbsp;chmod&nbsp;444&nbsp;root.cache.new&nbsp;<BR>&nbsp;rm&nbsp;-f&nbsp;root.cache.old&nbsp;<BR>&nbsp;mv&nbsp;root.cache&nbsp;root.cache.old&nbsp;<BR>&nbsp;mv&nbsp;root.cache.new&nbsp;root.cache&nbsp;<BR>&nbsp;ndc&nbsp;restart&nbsp;<BR>&nbsp;echo&nbsp;<BR>&nbsp;echo&nbsp;&quot;The&nbsp;nameserver&nbsp;has&nbsp;been&nbsp;restarted&nbsp;to&nbsp;ensure&nbsp;that&nbsp;the&nbsp;update&nbsp;is&nbsp;&nbsp;<BR>complete.&quot;&nbsp;<BR>&nbsp;echo&nbsp;&quot;The&nbsp;previous&nbsp;root.cache&nbsp;file&nbsp;is&nbsp;now&nbsp;called&nbsp;/var/named/root.&nbsp;<BR>cache.old.&quot;&nbsp;<BR>)&nbsp;2&gt;&amp;1&nbsp;|&nbsp;/usr/lib/sendmail&nbsp;-t&nbsp;<BR>exit&nbsp;0&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>------------------------------------------------------------------------&nbsp;<BR>--------&nbsp;<BR>&nbsp;<BR>有些人可能用&nbsp;ftp&nbsp;从&nbsp;Internic&nbsp;得到&nbsp;root.cache&nbsp;档案．请不要用&nbsp;ftp&nbsp;来更新&nbsp;&nbsp;<BR>root.cache，上面提到的方法更为便利．&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>--&nbsp;<BR>&nbsp;<BR>※&nbsp;来源:·BBS&nbsp;水木清华站&nbsp;smth.org·[FROM:&nbsp;210.34.33.55]&nbsp;<BR><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER></BODY></HTML>

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