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If you need to see more log information than that, simply change the number 10 to the number of lines that you need to see And if you would like to view the errors or logs in real time as they are being generated, you should use the -f option for the tail command This provides a valuable debugging tool, because you can try things out with the server (such as requesting web pages or restarting Apache) and view the results of your experiments in a separate virtual terminal window The tail command with the -f switch is shown here:
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This command will constantly tail the logs until you terminate the program (using ctrl-c)
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In this chapter, we covered the process of setting up your own web server using Apache from the ground up This chapter by itself is enough to get you going with a top-level page and a basic configuration It is highly recommended that you take some time to page through the Apache manual It is well written, concise, and flexible enough that you can set up just about any configuration imaginable In addition to the manual documentation, several good books about Apache have been written Ben Laurie and Peter Laurie s Apache: The Definitive Guide, Third Edition (O Reilly, 2002) covers the details of Apache quite well The text focuses on Apache and Apache only, so you don t have to wade through hundreds of pages to find what you need
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Linux Administration: A Beginner s Guide
he Simple Mail Transfer Protocol (SMTP) is the de facto standard for mail transport across the Internet Anyone who wants to have a mail server capable of sending and receiving mail across the Internet must be able to support it Many internal networks have also taken to using SMTP for their private mail services because of its platform independence and availability across all popular operating systems In this chapter, we ll first discuss the mechanics of SMTP as a protocol and its relationship to other mail-related protocols, such as Post Office Protocol (POP) and Internet Message Access Protocol (IMAP) Then we will go over the Postfix SMTP server, one of the easier and more secure SMTP servers out there
UNDERSTANDING SMTP
The SMTP protocol defines the method by which mail is sent from one host to another That s it It does not define how the mail should be stored It does not define how the mail should be displayed to the recipient SMTP s strength is its simplicity, and that is due, in part, to the dynamic nature of networks during the early 1980s (The SMTP protocol was originally defined in 1982) Back in those days, people were linking networks together with everything short of bubble gum and glue SMTP was the first mail standard that was independent of the transport mechanism This meant people using Transmission Control Protocol/Internet Protocol (TCP/IP) networks could use the same format to send a message as someone using two cans and a string SMTP is also independent of operating systems, which means each system can use its own style of storing mail without worrying about how the sender of a message stores his mail You can draw parallels to how the phone system works: Each phone service provider has its own independent accounting system However, they all have agreed upon a standard way to link their networks together so that calls can go from one network to another transparently
Rudimentary SMTP Details
Ever had a friend who sent you an e-mail on behalf of some government agency informing you that you owe taxes from the previous year, plus additional penalties Somehow, a message like this ends up in a lot of people s mailboxes around April Fool s Day We re going to show you how they did it and, what s even more fun, how you can do it yourself (Not that we would advocate such behavior, of course) The purpose of this example is to show how the SMTP protocol sends a message from one host to another After all, more important than learning how to forge an e-mail is learning how to troubleshoot mail-related problems So in this example, you are acting as the sending host, and whichever machine you connect to is the receiving host
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