Unix

Automating Linux and Unix System Administration (2nd by Kirk Bauer, Nate Campi

By Kirk Bauer, Nate Campi

Even if you would like a community of ten Linux desktops and a server or a knowledge middle with a number of thousand UNIX nodes, you want to understand how to automate a lot of the deploy, configuration, and conventional process administration.

Build your community as soon as utilizing cfengine, and the community construct will paintings, with out consumer intervention, on any you wish. Automating Linux and Unix approach management, moment variation is exclusive in its concentrate on the way to make the process administrator's activity more uncomplicated and extra effective: rather than simply handling the method administrator's time, the booklet explains the expertise to automate repetitive initiatives and the method to automate successfully.

* either new and professional pros will take advantage of industry–leading insights into the automation process.
*System directors will reach an intensive grab of cfengine, kickstart, and shell scripting for automation.
*After analyzing all chapters and following all workouts during this e-book, the reader could be capable of organize something from a Linux information heart to a small place of work community.

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Additional resources for Automating Linux and Unix System Administration (2nd Edition)

Example text

That second host might have been configured to forward ood)]cajp connections anywhere—including untrusted hosts. So, prudent users forward their agents only to specific hosts. These select machines allow only trusted users access to the nkkp account, and they also limit the hosts to which they will forward the ood)]cajp session. You can also do this on the command line instead of modifying the actual ood[ _kjbec file; simply specify the option )kBkns]n`=cajpjkxuao to the ood command. Also note that, in the ]qpdkneva`[gauo file, you can use the bnki directive to restrict which remote hosts are allowed to connect with the specified key (discussed next in the “Restricting RSA Authentication” section).

Pull You can take one of two main approaches when configuring, maintaining, and modifying systems: the “push” method or the “pull” method. The “push” method is when you have one or more systems contact the rest of the systems and perform the necessary tasks. 13 14 CHAPTER 1 N I NTRODUC ING THE BA S IC S OF A UTOM A T I O N You implement the “pull” method by having the systems contact one or more servers on a regular basis to receive configuration instructions and configure themselves. Both methods have their advantages and disadvantages.

This entire chapter is devoted to SSH because it plays such an important part in securely automating system administration. In this introductory chapter, we assume that you already have SSH installed and operating properly. x using version 2 of the SSH protocol. If you are using another version of SSH, the principles are the same, but the implementation details might differ. For a more thorough and complete discussion of SSH, we highly recommend SSH, The Secure Shell: The Definitive Guide, Second Edition by Daniel J.

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