Beginning Web Development With Perl : From Novice to ... - Nabo

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194CHAPTER 10 ■ APACHE AND MOD_PERLYou can download mod_perl’s source code from http://perl.apache.org/, and you canget the source code for the Apache web server from http://httpd.apache.org/. Download thelatest mod_perl in the 1.0 series and the latest Apache in the 1.3 series. Although the Apache 2.0and mod_perl 2.0 series are available, the 1.N branch of each of these applications is much morewidely deployed in production environments. Over the next three to five years, this situationwill likely change, as is inevitable in the world of software.Unpacking the CodeIn these examples, I’ve downloaded the source code to my home directory, /home/suehring. Within that directory are the two tarred files containing the source code:mod_perl-1.0-current.tar.gz and apache_1.N.NN.tar.gz.Unpack the Apache source:tar -zxvf apache_1.3.33.tar.gzUnpack the mod_perl source:tar -zxvf mod_perl-1.0-current.tar.gzLooking for PrerequisitesBuilding Apache and mod_perl requires some supporting software to be available. Most systemswill have this software already loaded. However, if you haven’t compiled software on thesystem before and no other software has been built as part of an installation, there’s a chancethat one or more of these prerequisites might not be installed.Every Linux distribution I’ve ever used has the software available through the normalpackage-management tools. Therefore, if you find that you’re missing a prerequisite, consultyour distribution’s documentation for installation of that prerequisite. It will likely be an easyprocess, since the prerequisites for building mod_perl are quite common.The following three commands are recommended by the mod_perl documentation todetermine the status of the prerequisites:make -vgcc -vperl -vI would hope by this point in the book that the Perl command will be successful! If any ofthese return something like Command not found, you’ll need to install the prerequisite beforeproceeding.Building and Installing mod_perlCompiling Apache customized for a particular installation is a complex process. Locations for files,static linking, which modules to install, and other considerations make Apache one of the morecomplicated configurations of all Linux software. It would be quite difficult to select a certain set orsubset of options to satisfy every need. The Apache documentation (http://httpd.apache.org/) isa good starting point for those wishing to learn about Apache’s configuration options. In addition,the INSTALL documentation that comes with the Apache source is another great resource. For thepurposes of this chapter, I’m going to show you how to build Apache with mod_perl with all optionsenabled.
CHAPTER 10 ■ APACHE AND MOD_PERL 195■Note Best practice system administration says, and I agree, that enabling all options is a bad idea on productionsystems. More applications and options mean a greater footprint in terms of both resources andsecurity. The difference in resources between everything and a minimum set of functions isn’t incrediblylarge with Apache and mod_perl, especially with modern hardware. However, more code almost alwaysmeans more chances for bugs that could crop up at the most inopportune time. From a security standpoint,if something doesn’t exist, it can’t be exploited. When everything is compiled in, a security exploitfor a piece of the code would make the program vulnerable. For these reasons, I recommend spendingtime learning exactly which Apache modules you need and disabling those you don’t need.With both the Apache and mod_perl sources unzipped, change into the mod_perl sourcedirectory:cd mod_perl-1.NNFor example, to change into the mod_perl directory for version 1.29, this command wouldget you there:cd mod_perl-1.29mod_perl uses Perl to create the Makefile and uses some command-line arguments andswitches to configure the compile process. Chief among those command-line arguments isthe location of the Apache source code. Since you unpacked the Apache source to the directoryone level up from the mod_perl source directory, however, mod_perl will be able to find it.From within the mod_perl source directory, type the following:perl Makefile.PL EVERYTHING=1 USE_APACI=1The Makefile.pl script will now run. Pay particular attention to any warnings and followtheir instructions. Here is an example:************* WARNING *************Your Perl is configured to link against libgdbm,but libgdbm.so was not found.You could just symlink it to /usr/lib/libgdbm.so.1.7.3************* WARNING *************The script will ask a couple questions about how to build the software:Will configure via APACIConfigure mod_perl with ../apache_1.3.33/src ? [y]Shall I build httpd in ../apache_1.3.33/src for you? [y]The script will create a Makefile checking for other prerequisites such as the Perl developmentfiles. If you installed Perl as a package with your distribution (this is usually the case),you might need to install the Perl development package as well. I recommend installing thispackage from your distribution, rather than downloading a new version of Perl and compilingit from source.
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Beginning Web Development with Perl
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PART 5 ■ ■ ■ Creating Web Tem
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■CONTENTSvii■CHAPTER 4 System I
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■CONTENTSixCreating a SOAP Listen
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■CONTENTSxiTemplate Toolkit Synta
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About the Author■STEVE SUEHRING i
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AcknowledgmentsThanks to James Lee
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xx■INTRODUCTIONThis book will use
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CHAPTER 1■ ■ ■The CGI ModuleT
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CHAPTER 1 ■ THE CGI MODULE 5for t
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CHAPTER 1 ■ THE CGI MODULE 7Obvio
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CHAPTER 1 ■ THE CGI MODULE 9exit;
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CHAPTER 1 ■ THE CGI MODULE 11Each
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CHAPTER 1 ■ THE CGI MODULE 15Upda
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CHAPTER 1 ■ THE CGI MODULE 27No m
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CHAPTER 1 ■ THE CGI MODULE 29The
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CHAPTER 1 ■ THE CGI MODULE 33Also
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CHAPTER 2■ ■ ■Popular CGI Mod
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CHAPTER 2 ■ POPULAR CGI MODULES 3
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50CHAPTER 3 ■ DATABASES AND PERLT
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52CHAPTER 3 ■ DATABASES AND PERLm
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54CHAPTER 3 ■ DATABASES AND PERLl
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56CHAPTER 3 ■ DATABASES AND PERLc
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58CHAPTER 3 ■ DATABASES AND PERLR
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62CHAPTER 3 ■ DATABASES AND PERLw
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64CHAPTER 3 ■ DATABASES AND PERLA
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74CHAPTER 4 ■ SYSTEM INTERACTION
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76CHAPTER 4 ■ SYSTEM INTERACTIONt
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78CHAPTER 4 ■ SYSTEM INTERACTIONc
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80CHAPTER 4 ■ SYSTEM INTERACTIONA
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82CHAPTER 4 ■ SYSTEM INTERACTIONm
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84CHAPTER 4 ■ SYSTEM INTERACTIONs
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86CHAPTER 4 ■ SYSTEM INTERACTIONr
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CHAPTER 5■ ■ ■LWP ModulesLWP
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CHAPTER 5 ■ LWP MODULES 91HTTP Re
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CHAPTER 5 ■ LWP MODULES 93Get Fun
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CHAPTER 5 ■ LWP MODULES 95When ca
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CHAPTER 5 ■ LWP MODULES 97These a
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CHAPTER 5 ■ LWP MODULES 99Recall
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CHAPTER 5 ■ LWP MODULES 101which
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108CHAPTER 6 ■ NET:: TOOLSCreatin
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110CHAPTER 6 ■ NET:: TOOLSThe out
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112CHAPTER 6 ■ NET:: TOOLSmy $pop
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114CHAPTER 6 ■ NET:: TOOLSthe POP
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116CHAPTER 6 ■ NET:: TOOLS($messa
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118CHAPTER 6 ■ NET:: TOOLSListing
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120CHAPTER 6 ■ NET:: TOOLSFor the
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122CHAPTER 6 ■ NET:: TOOLSNet::SM
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124CHAPTER 6 ■ NET:: TOOLS$smtpco
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126CHAPTER 6 ■ NET:: TOOLSuse Net
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128CHAPTER 6 ■ NET:: TOOLSListing
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130CHAPTER 6 ■ NET:: TOOLSFor exa
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132CHAPTER 6 ■ NET:: TOOLSSending
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PART 3■ ■ ■XML and RSS
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138CHAPTER 7 ■ SOAP-BASED WEB SER
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140CHAPTER 7 ■ SOAP-BASED WEB SER
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CHAPTER 13■ ■ ■Perl Web Sites
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CHAPTER 13 ■ PERL WEB SITES WITH
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284APPENDIX ■ PERL BASICSKeywords
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286APPENDIX ■ PERL BASICS$ perl n
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288APPENDIX ■ PERL BASICSAnd line
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290APPENDIX ■ PERL BASICSCan you
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292APPENDIX ■ PERL BASICSBy defau
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294APPENDIX ■ PERL BASICS#!/usr/b
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296APPENDIX ■ PERL BASICSThe last
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298APPENDIX ■ PERL BASICSThe NOT
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300APPENDIX ■ PERL BASICSprint "S
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302APPENDIX ■ PERL BASICSthe syst
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304APPENDIX ■ PERL BASICS$ perl s
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306APPENDIX ■ PERL BASICSThis cod
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308APPENDIX ■ PERL BASICS$a = 6 *
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310APPENDIX ■ PERL BASICS$a = "A9
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312APPENDIX ■ PERL BASICS#!/usr/b
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314APPENDIX ■ PERL BASICSmy $name
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316APPENDIX ■ PERL BASICSis short
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318APPENDIX ■ PERL BASICSLet’s
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320APPENDIX ■ PERL BASICSOther Te
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322APPENDIX ■ PERL BASICS}}}actio
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324APPENDIX ■ PERL BASICSNotice t
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326APPENDIX ■ PERL BASICSLooping
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330APPENDIX ■ PERL BASICSuntil ($
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332APPENDIX ■ PERL BASICSuse stri
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334APPENDIX ■ PERL BASICSdoneAll
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336APPENDIX ■ PERL BASICS$ perl r
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338APPENDIX ■ PERL BASICSSummaryT
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340■INDEXmethods for retrieving r
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342■INDEXdo() method for, 62dumpi
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344■INDEXhello option for Net::SM
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346■INDEXNet::DNS module, 125-128
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348■INDEXrecord with Net::DNS mod
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350■INDEXstoring mail server in e
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352■INDEXlogging based on, 229pri
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