Download Automating Linux and Unix System Administration by Nathan Campi, Kirk Bauer PDF

By Nathan Campi, Kirk Bauer

Bauer K., Campi N. Automating Linux and Unix procedure management, moment variation (Apress, 2008)(ISBN 1430210591)

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Sample text

You can also use classes in cfengine to perform different actions on different systems (discussed throughout the book). These approaches will be necessary to some degree, but your first and best option is to minimize these differences among your systems. 50ROJECTdppl6++sss*cjq*knc) is helpful because the GNU developers have created open source versions of most standard UNIX commands. You can compile these to run on any system, but most of them are binary programs, so you’ll need to compile each program for each platform or find prebuilt packages.

Once that command terminates, any stored keys are lost. This is fine when you can start your entire X session as you just saw, but what if you can’t? You can use the ood)]cajp command as shown in the next section to start a new ood)]cajp for each login. This works well, unless you have a good number of simultaneous logins, in which case you will have to add your SSH keys for each session. If you are in this situation, consider using a tool called keychain that allows all your logins on the same system to share the same ood)]cajp easily.

We already mentioned that in many cases automation techniques provide automatic documentation. You should take full advantage of this easy documentation whenever possible. Consider, as an example, a web server under your control. You can manually configure the web server and document the process for yourself and others in the future, or you can write a script to configure the web server for you. With a script, you can’t neglect anything—if you forget to do something, the web server does not run properly.

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