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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-9&nbsp;<BR>发信站:&nbsp;BBS&nbsp;水木清华站&nbsp;(Sun&nbsp;Feb&nbsp;&nbsp;4&nbsp;15:49:12&nbsp;2001)&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>9.&nbsp;常见问题解答&nbsp;<BR>本节中我将列出一些关於&nbsp;DNS&nbsp;以及本文件最常被提出的问题．还有解答&nbsp;:-)&nbsp;在写&nbsp;<BR>信给我前请先阅读过本节．&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>如何在防火墙之内使用&nbsp;DNS&nbsp;?&nbsp;&nbsp;<BR>一些提示:&nbsp;`forwarders',&nbsp;`slave',&nbsp;以及参考本文件最後面的文献列表．&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>如何利用&nbsp;DNS&nbsp;提供的可用位址於某一服务，如&nbsp;www.busy.site，以获得负荷平衡&nbsp;<BR>或类似的效果?&nbsp;&nbsp;<BR>为&nbsp;www.busy.site&nbsp;加上许多&nbsp;A&nbsp;记录，而且使用&nbsp;bind&nbsp;4.9.3&nbsp;或以後的版本．这样&nbsp;<BR>&nbsp;bind&nbsp;会使用&nbsp;round-robin&nbsp;演算法找寻答案．这不能在更早版本的&nbsp;bind&nbsp;上工作&nbsp;<BR>．&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>我想在一封闭的&nbsp;Intranet&nbsp;上架设&nbsp;DNS．我该怎麽做?&nbsp;&nbsp;<BR>把暂存档案丢掉只留区域档案．这也表示你将不需要更新暂存档案．&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>我的系统没有&nbsp;ndc&nbsp;程式．我该怎麽办?&nbsp;&nbsp;<BR>你的系统安装过一旧的，可能过期的&nbsp;bind&nbsp;程式．如果安全性对你很重要:&nbsp;立刻将&nbsp;<BR>&nbsp;bind&nbsp;升级．如果不是，你也可以用这旧的．你可直接执行&nbsp;named&nbsp;而不是&nbsp;ndc&nbsp;&nbsp;<BR>start．&nbsp;ndc&nbsp;reload&nbsp;变成&nbsp;named.reload&nbsp;而&nbsp;ndc&nbsp;restart&nbsp;变成&nbsp;named.restart．&nbsp;<BR>所有这些程式可能都在&nbsp;/usr/sbin&nbsp;里．&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>如何建立次要名称伺服器?&nbsp;&nbsp;<BR>如果主要名称伺服器的地址是&nbsp;127.0.0.1，在你的次要名称伺服器的&nbsp;named.&nbsp;<BR>boot&nbsp;档案中放一行:&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>------------------------------------------------------------------------&nbsp;<BR>--------&nbsp;<BR>&nbsp;<BR>&nbsp;&nbsp;secondary&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linux.bogus&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;127.0.0.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;sz/linux.bogus&nbsp;<BR>&nbsp;&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>------------------------------------------------------------------------&nbsp;<BR>--------&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>我希望离线时&nbsp;bind&nbsp;仍继续执行．&nbsp;&nbsp;<BR>我收到来自&nbsp;Ian&nbsp;Clark&nbsp;&lt;&nbsp;<A HREF="mailto:ic@deakin.edu.au>">ic@deakin.edu.au></A>&nbsp;的信件解释他如何办到这点．&nbsp;&nbsp;<BR>&nbsp;<BR>I&nbsp;run&nbsp;named&nbsp;on&nbsp;my&nbsp;'Masquerading'&nbsp;machine&nbsp;here.&nbsp;I&nbsp;have&nbsp;&nbsp;<BR>two&nbsp;root.cache&nbsp;files,&nbsp;one&nbsp;called&nbsp;root.cache.real&nbsp;which&nbsp;contains&nbsp;&nbsp;<BR>the&nbsp;real&nbsp;root&nbsp;server&nbsp;names&nbsp;and&nbsp;the&nbsp;other&nbsp;called&nbsp;root.cache.fake&nbsp;&nbsp;<BR>which&nbsp;contains...&nbsp;<BR>&nbsp;<BR>--------------&nbsp;<BR>;&nbsp;root.cache.fake&nbsp;<BR>;&nbsp;this&nbsp;file&nbsp;contains&nbsp;no&nbsp;information&nbsp;<BR>--------------&nbsp;<BR>&nbsp;<BR>When&nbsp;I&nbsp;go&nbsp;off&nbsp;line&nbsp;I&nbsp;copy&nbsp;the&nbsp;root.cache.fake&nbsp;file&nbsp;to&nbsp;root.cache&nbsp;and&nbsp;<BR>restart&nbsp;named.&nbsp;<BR>&nbsp;<BR>When&nbsp;I&nbsp;go&nbsp;online&nbsp;I&nbsp;copy&nbsp;root.cache.real&nbsp;to&nbsp;root.cache&nbsp;and&nbsp;restart&nbsp;<BR>named.&nbsp;<BR>&nbsp;<BR>This&nbsp;is&nbsp;done&nbsp;from&nbsp;ip-down&nbsp;&amp;&nbsp;ip-up&nbsp;respectively.&nbsp;<BR>&nbsp;<BR>The&nbsp;first&nbsp;time&nbsp;I&nbsp;do&nbsp;a&nbsp;query&nbsp;off&nbsp;line&nbsp;on&nbsp;a&nbsp;domain&nbsp;name&nbsp;named&nbsp;doesn't&nbsp;<BR>have&nbsp;details&nbsp;for&nbsp;it&nbsp;puts&nbsp;an&nbsp;entry&nbsp;like&nbsp;this&nbsp;in&nbsp;messages..&nbsp;<BR>&nbsp;<BR>Jan&nbsp;28&nbsp;20:10:11&nbsp;hazchem&nbsp;named[10147]:&nbsp;No&nbsp;root&nbsp;nameserver&nbsp;for&nbsp;class&nbsp;IN&nbsp;<BR>&nbsp;<BR>which&nbsp;I&nbsp;can&nbsp;live&nbsp;with.&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>It&nbsp;certainly&nbsp;seems&nbsp;to&nbsp;work&nbsp;for&nbsp;me.&nbsp;I&nbsp;can&nbsp;use&nbsp;the&nbsp;nameserver&nbsp;for&nbsp;<BR>local&nbsp;machines&nbsp;while&nbsp;off&nbsp;the&nbsp;'net&nbsp;without&nbsp;the&nbsp;timeout&nbsp;delay&nbsp;for&nbsp;<BR>external&nbsp;domain&nbsp;names&nbsp;and&nbsp;I&nbsp;while&nbsp;on&nbsp;the&nbsp;'net&nbsp;queries&nbsp;for&nbsp;external&nbsp;<BR>domains&nbsp;work&nbsp;normally&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>名称伺服器将暂存资料保存在那儿?&nbsp;有任何方法可以控制它的大小吗?&nbsp;&nbsp;<BR>所有的暂存资料都保存在记忆体中，任何时刻它都不会被写入磁碟中．每次你杀掉&nbsp;<BR>&nbsp;named&nbsp;时这些暂存资料就没有了．没有任何方法可以控制暂存资料．&nbsp;named&nbsp;用一&nbsp;<BR>些简单的法则来管理它．你不能用任何理由任何方法控制暂存资料或其大小．如果&nbsp;<BR>你希望如此你可以自己去改&nbsp;named&nbsp;的程式．不过最好别这麽做．&nbsp;&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>如何在重新起始&nbsp;named&nbsp;之间保存暂存资料?&nbsp;我可以把它存下来吗?&nbsp;&nbsp;<BR>不!&nbsp;named&nbsp;被杀掉时不会保留暂存资料．这就是说暂存资料必须在每次你杀掉并重&nbsp;<BR>新起始&nbsp;named&nbsp;後重新建立．&nbsp;没有办法让&nbsp;named&nbsp;将暂存资料存到档案里．如果你&nbsp;<BR>希望如此你可以自己去改&nbsp;named&nbsp;的程式．不过最好别这麽做．&nbsp;&nbsp;<BR>&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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