DNS and BIND 第五章 DNS和Email
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2008/05/31 .. by Rico
2008/05/31 .. by Rico
"And here Alice began to get rather sleepy, and went on saying to herself, in a dreamy sort of way, "Do cats eat bats? Do cats eat bats?" and sometimes "Do bats eat cats?" for, you see, as she couldn't answer either question, it didn't much matter which way she put it."
我打赌看过那么长一章内容后你也一定昏昏欲睡了。感谢的是本章系统管理员和邮件管理员会感兴趣：DNS如何影响email。就是你没兴趣，起码它也没那么长。（对我这个翻译来说也乐意听到！）
与主机表相比域名系统的改进之一是支持高级邮件路由。邮箱软件在只有HOSTS.TXT文件时(或者其衍生物/etc/hosts)，能做的就是把邮件发到某个主机的IP地址。如果失败，即延迟再重发，也不能把邮件弹给发信人。
DNS提供了一个机制，指定邮递的备份主机，并允许主机假定其它主机的邮件处理响应。这允许不运行邮件软件的无盘主机借助服务器拥有邮件地址。
DNS不像主机表一样允许在email目标中使用任意名称。可以用你的域名作为email目标，或者在你的zone数据文件添加纯粹的email目标域名，此域名不代表任何一台特定主机。一个单纯的逻辑email目标也有可能代表好几台邮件服务器。而在主机表下，邮件目标只能永远是主机。
总之，这些特性让管理员能更加灵活地在其网络上设置email。
DNS and BIND 第四章 设置BIND
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2008/05/29 .. by Rico
2008/05/29 .. by Rico
"It seems very pretty," she said when she had finished it, "but it's rather hard to understand!" (You see she didn't like to confess, even to herself, that she couldn't make it out at all.) "Somehow it seems to fill my head with ideasonly I don't exactly know what they are!"
如果你已经勤奋地阅读前面每章内容，现在一定渴望弄台域名服务器跑跑。本章就是为这写的。让我们建起几个域名服务器。还有些人浏览了一下目录然后直接跳到本章，要注意我们使用的概念不少是在前面中提到的。
有一些实际情况会影响你如何建立自己的域名服务器。最大一种情况是你是如何联到互联网上：完全存取（比如，你能够ftp到ftp.rs.internic.net上），有限存取（被安全防火墙限制），还是根本不能存取。本章假定你能够完全存取。其他的将在第11章讨论。
在本章，我们建立两个虚拟域名服务器，你可以把它作为建立你自己的域名服务器的例子来模仿。我们描述的细节足够你让自己的域名服务器跑起来。后续章节主要是做些补充并继续深入。如果你的nameserer已经跑起来了，浏览一下本章熟悉一下相应词汇，或者检查一下你建立自己的域名服务器时有没有漏掉什么。
Linux Find SCSI Hard Disk Model
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2008/05/28 .. by Rico
2008/05/28 .. by Rico
Simply use utility called sdparm to fetch SCSI / SATA device information. Inquiry data including Vital Product Data (VPD) pages can also be displayed. Commands associated with starting and stopping the medium; loading and unloading the medium; and other housekeeping functions may also be performed by this utility.
In short you can get or set SCSI hard disk parameters. If you are using ATA ( IDE ) hard disk use hdparm utility.
Install sdparm utility
In short you can get or set SCSI hard disk parameters. If you are using ATA ( IDE ) hard disk use hdparm utility.
Install sdparm utility
# yum install sdparm
DNS and BIND 第三章 我如何开始
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2008/05/27 .. by Rico
2008/05/27 .. by Rico
"What do you call yourself?" the Fawn said at last. Such a soft sweet voice it had!
"I wish I knew!" thought poor Alice. She answered, rather sadly, "Nothing, just now."
"Think again," it said: "that won't do."
Alice thought, but nothing came of it. "Please, would you tell me what you call yourself?"
she said timidly. "I think that might help a little."
"I'll tell you, if you come a little further on," the Fawn said. "I can't remember here."
"I wish I knew!" thought poor Alice. She answered, rather sadly, "Nothing, just now."
"Think again," it said: "that won't do."
Alice thought, but nothing came of it. "Please, would you tell me what you call yourself?"
she said timidly. "I think that might help a little."
"I'll tell you, if you come a little further on," the Fawn said. "I can't remember here."
现在你理解了域名系统后面的原理，我们可以介入更多实用事务了。在你设置你的zone之前，你需要获得BIND软件。通常它是大部分基于Unix操作系统的标准。不过你可能想找到使用最新的功能及安全增强的最新的版本。
一旦有了BIND，你需要为你的主zone想个域名；这可能并不像说的那样容易，因为要在域名空间上找到合适的位置。想好域名后，你需要联系你选择的域名的父域名管理员申请此域名。
事情得一件件办，现在我们讨论从哪获得BIND。
DNS and BIND 第二章 DNS如何工作
: 2008/05/24 .. by Rico
2008/05/24 .. by Rico
" . . . and what is the use of a book," thought Alice, "without pictures or conversations?"
域名系统基本是就是主机信息的数据库。一般来说，你可以看成：用点分隔的名称、域名服务器、以及隐藏的域名空间。要始终记住的是，DNS服务提供的是internet主机信息。
前面我们已经涉及了DNS的一些重要方面，包括它的C/S架构及数据库的结构。然而，我们并没有深入更多细节，并且没有解释DNS的操作细节。
在本章，我们将解释并描述DNS的工作机制。我们还将介绍阅读本书后续部分的铺垫知识。
首先，让我们再更深入地了解一下上一章介绍过的概念的更多细节。
