Linux System Administration Recipes A Problem-Solution Approach

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CHAPTER 7 ■ WORKING WITH APACHEapache2 -k stop; apachectl startHere’s a default /etc/apache2/apache2.conf file to start off with:ServerRoot "/etc/apache2"LockFile /var/lock/apache2/accept.lockPidFile ${APACHE_PID_FILE}Timeout 300KeepAlive OnMaxKeepAliveRequests 100KeepAliveTimeout 15User ${APACHE_RUN_USER}Group ${APACHE_RUN_GROUP}AccessFileName .htaccessOrder allow,denyDeny from allDefaultType text/plainHostnameLookups OffErrorLog /var/log/apache2/error.logLogLevel warnInclude /etc/apache2/mods-enabled/*.loadInclude /etc/apache2/mods-enabled/*.confInclude /etc/apache2/ports.confInclude /etc/apache2/conf.d/Include /etc/apache2/sites-enabled/ServerAdmin webmaster@localhostDocumentRoot /var/www/Options FollowSymLinksAllowOverride NoneThe first thing to do is to test this config file:apache2 -tThis will check that the config files are syntactically correct. It’s a very useful one to use before youtry restarting your production server!158Download at WoweBook.Com
CHAPTER 7 ■ WORKING WITH APACHEOnce you’ve run that test, just use apachectl start to start Apache with this config (then useapachectl stop to stop it again). Now let’s try some of the possible options you can use for testingalternative configs.■ Note In Debian/Ubuntu, you may find that you need to source the Apache environment variables before usingapache2 as shown in this recipe, or you’ll get error messages such as this:apache2: bad user name ${APACHE_RUN_USER}Do this with the following:. /etc/apache2/envvars1. Start Apache using an alternative DocumentRoot:apache2 -k start -c "DocumentRoot /var/www/html_debug/"The DocumentRoot processing directive specifies the directory that will beserved as the root of your web space. So, when starting Apache with theprevious command, if you then went to http://www.example.com, the pageserved would be /var/www/html_debug/index.html. This is useful if you’retesting alternative versions of your web site, because it avoids having to editthe DocumentRoot option.You can also use -c to set any other directive. Note that -c processes thedirective after reading the config files (so it will overwrite config file settings),whereas -C will process the directive before the config files. Use this if youwant to set something that will affect the rest of the config processing, such assetting a custom log file with the following:apache2 -k start -C "CustomLog /var/log/apache2/testlog"Bear in mind that later directives in the file may override directives set with -C,such as if the standard apache2.conf has a CustomLog directive set, for example.You may be better off using a separate config altogether, as in the nextsuggestion.2. Start Apache with an entirely different config file:apache2 -k start -f conf/httpd.conf.debugThis is useful if you’re changing a big stack of options at once (and so using -cwould be unwieldy) or testing something like SSL (see recipe 7-4).159Download at WoweBook.Com
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Contents■About the Author .......
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■ CONTENTS3-7. Writing a Nagios P
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■ CONTENTS■Chapter 8: Using the
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■ CONTENTSAbout the Author■Juli
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■ CONTENTSAcknowledgmentsMany tha
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■ CONTENTSIntroductionThis book i
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■ INTRODUCTIONDownloading the Cod
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C H A P T E R 1■ ■ ■Saving Yo
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CHAPTER 1 ■ SAVING YOURSELF EFFOR
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C H A P T E R 2■ ■ ■Centraliz
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CHAPTER 2 ■ CENTRALIZING YOUR NET
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C H A P T E R 3■ ■ ■Monitorin
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CHAPTER 3 ■ MONITORING AND UPDATI
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C H A P T E R 4■ ■ ■Taking Ba
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CHAPTER 4 ■ TAKING BACKUPS AND MA
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Page 157 and 158: CHAPTER 6 ■ SECURING YOUR SYSTEMS
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CHAPTER 10 ■ THINGS GO IN, THINGS
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CHAPTER 10 ■ THINGS GO IN, THINGS
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C H A P T E R 11■ ■ ■Tracking
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CHAPTER 11 ■ TRACKING DOWN BUGSTh
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CHAPTER 11 ■ TRACKING DOWN BUGS01
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CHAPTER 11 ■ TRACKING DOWN BUGS
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CHAPTER 11 ■ TRACKING DOWN BUGSTh
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CHAPTER 11 ■ TRACKING DOWN BUGSAn
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CHAPTER 11 ■ TRACKING DOWN BUGS#
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C H A P T E R 12■ ■ ■Managing
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CHAPTER 12 ■ MANAGING TIME AND PE
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APPENDIX■ ■ ■Perl TipsSee rec
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APPENDIX ■ PERL TIPS• Date::Par
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APPENDIX ■ PERL TIPSPerl Syntax N
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■ ■ ■Index■Symbols$CDPATH,
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■ INDEXenscript option (printing)
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■ INDEX■NNagiosadding hosts to,
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■ INDEXsyslogcentralized logging
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