Unix

Absolute OpenBSD: UNIX for the Practical Paranoid (2nd by Michael W. Lucas

By Michael W. Lucas

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The definitive consultant to OpenBSD

Foreword by way of Henning Brauer, OpenBSD PF Developer

OpenBSD, the stylish, hugely safe Unix-like working method, is favourite because the foundation for severe DNS servers, routers, firewalls, and extra. This long-awaited moment version of Absolute OpenBSD keeps writer Michael Lucas's trademark common and useful procedure that readers have loved for years. You'll study the intricacies of the platform, the technical information in the back of sure layout judgements, and most sensible practices, with bits of humor sprinkled all through. This variation has been thoroughly up to date for OpenBSD 5.3, together with new assurance of OpenBSD's boot approach, safety features like W^X and ProPolice, and complicated networking techniques.

You'll learn the way to:
* deal with community site visitors with VLANs, trunks, IPv6, and the PF packet filter
* Make software program administration speedy and powerful utilizing the ports and applications system
* supply clients in simple terms the entry they wish with teams, sudo, and chroots
* Configure OpenBSD's safe implementations of SNMP, DHCP, NTP, sensors, and more
* customise the deploy and improve procedures to your community and undefined, or construct a customized OpenBSD release

Whether you're a brand new consumer searching for an entire advent to OpenBSD or an skilled sysadmin searching for a refresher, Absolute OpenBSD, second Edition offers you every little thing you want to grasp the intricacies of the world's safest working system.

"The definitive booklet on OpenBSD will get a long-overdue refresh."

-Theo de Raadt, OpenBSD Founder

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Additional resources for Absolute OpenBSD: UNIX for the Practical Paranoid (2nd Edition)

Sample text

In an ideal world, you would read every man page and be able to hold an integrated image of the system in your head. Because most of us can’t do this, this section directs you to related man pages. org/ and its various online mirrors. One of the interesting things about the web-based man pages is that you can look at them for both previous releases and for other architectures. Do you want to know if there’s a difference between the sysctl command for i386 and Loongson hardware? The web versions will let you compare two different man pages.

I still have bad days due to people, mind you, but I largely solve them by other means. Don’t ask about the mounds of dirt in my backyard. xxx Introduction What Is BSD? In the 1970s, AT&T needed a lot of specialized, custom-written computer software to run its business. The company was forbidden to compete in the computer industry, so it could not sell this software. Instead, AT&T licensed its software and the related source code to universities for nominal sums. Universities saved money by using this software instead of commercial equivalents with pricey licenses, and university students got access to this nifty technology and could learn how everything worked.

There is no toll-free number to call and no vendor to guide you. No, you may not speak to the manager of the support team. There isn’t one. The management is you. Many commercial operating systems conceal their inner workings, and the only access you get is through the programs, application programming interfaces (APIs), and application binary interfaces (ABIs) they provide. If you want to learn more about how your operating system works, you can’t (unless you reverse-engineer it). When something breaks, you either live with it or pay the vendor to solve the problem.

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