Linux System Administration Recipes A Problem-Solution Approach

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CHAPTER 3 ■ MONITORING AND UPDATING■ Note Be very, very careful with this! If you type something wrong, you could hose not just one system but allthe systems you’re connected to. However, used carefully, it can be incredibly useful. Just check twice (maybeeven three times in some cases...) before you hit Enter.It’s available as a package for Debian/Ubuntu:sudo apt-get install clustersshor can be installed from source (http://sourceforge.net/projects/clusterssh/).Generate a default global config file with this:cssh -u > /etc/csshrcThen, to set up a system-wide cluster definition, edit the /etc/clusters file to look somethinglike this:servers server1 server2 server3This creates a group called servers, with members server1, server2, and server3. If you nowtype this:cssh serversyou’ll see three SSH windows opening, one to each of the servers.■ Note You can also generate a personal config file with this:cssh -u > /$HOME/.csshrcand can add cluster definitions to this with the same syntax as with the /etc/clusters file. Any cluster definitionsin here will of course exist only for you, rather than being system-wide.92Download at WoweBook.Com
CHAPTER 3 ■ MONITORING AND UPDATINGWith this setup, though, you’ll be logging on as whatever user you’re currently logged in as. To set itup so that you log in as a specific user (say, as root), you can use this syntax in the cluster tag:servers root@server1 root@server2 root@server3It becomes even more useful if you have login via SSH key set up; see recipe 6-1 for more on this.■ Note You can also stick clusters together. If you set up these cluster definitions (tags):servers server1 server2 server3desktops desktop1 desktop2 desktop3all servers desktopsthen cssh all will connect to all six machines at once.93Download 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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CHAPTER 6 ■ SECURING YOUR SYSTEMS
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C H A P T E R 7■ ■ ■Working w
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CHAPTER 7 ■ WORKING WITH APACHEOn
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CHAPTER 7 ■ WORKING WITH APACHEdi
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CHAPTER 7 ■ WORKING WITH APACHE4.
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CHAPTER 7 ■ WORKING WITH APACHE
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CHAPTER 7 ■ WORKING WITH APACHEAl
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CHAPTER 7 ■ WORKING WITH APACHE
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C H A P T E R 8■ ■ ■Making Be
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CHAPTER 8 ■ USING THE COMMAND LIN
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C H A P T E R 9■ ■ ■Working w
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CHAPTER 9 ■ WORKING WITH TEXT IN
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C H A P T E R 10■ ■ ■Things G
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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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Linux System Administration Recipes A Problem-Solution Approach

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