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

By Kirk Bauer, Nathan Campi

This can be the second one version of a identify that succeeded prior to its time – this moment version comes at a well timed juncture for Linux directors and should develop into a key reference. If Linux directors are looking to construct a small or medium-sized community or datacenter, this is often the ebook to teach them find out how to do it by way of automating the construct procedure. Linux datacenters have elevated over the past five years and actually millions of Linux process directors on all five continents want this data.

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Extra resources for Automating Linux and Unix System Administration, Second Edition (Expert's Voice in Linux)

Example text

Each and every step in an automation or administrative script needs to ensure sucCESSDONTEVERMOVEONBLINDLYWITHTHEASSUMPTIONTHATACOMMANDWORKED%VEN C H A P T E R 2 N A P P LY I N G P R A C T I C A L A U T O M A T I O N something as simple as copying a few config files into a new user’s home directory can fail when a disk fills up. Assumptions can and will bite you. Focusing on Results When in doubt, opt for simplicity. Don’t attempt fancy logic and complicated commands when the goal is simple.

You probably won’t ever need to automate ISO-file creation (although every site is different), but it’s important to remember that the vast majority of automation operations are based on copying and/or modifying files. Either you need to update a file by copying a new file over it, edit the file in place, or copy out an additional file or files. Often when files change or new files are distributed, a process on the host needs to restart so the host can recognize the change. Sometimes a host process starts for the first time if the new files comprise a new server/daemon process distributed as a package, tarball, or simply a file.

If it generates any errors, you might find it difficult to determine what failed. Plus, you might encounter problems because the script attempts all the steps regardless of any errors resulting from earlier steps. ejkn`anpkna_aeraukqn l]ooskn`(]j`pk]og]jumqaopekjopd]pukqi]ud]ra* AKB Because the revised script ensures that it’s running on the right host and that an argument is passed to it, it now helps the SA make sure it’s not called incorrectly. This helps the author and any other users of the script.

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