By Michael W. Lucas
The definitive consultant to OpenBSD
Foreword through Henning Brauer, OpenBSD PF Developer
OpenBSD, the based, hugely safe Unix-like working approach, is customary because the foundation for serious DNS servers, routers, firewalls, and extra. This long-awaited moment variation of Absolute OpenBSD continues writer Michael Lucas's trademark simple and functional method that readers have loved for years. You'll study the intricacies of the platform, the technical info at the back of convinced layout judgements, and top practices, with bits of humor sprinkled all through. This variation has been thoroughly up to date for OpenBSD 5.3, together with new insurance of OpenBSD's boot procedure, security measures like W^X and ProPolice, and complex 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 quickly and potent utilizing the ports and applications system
* provide clients simply the entry they want with teams, sudo, and chroots
* Configure OpenBSD's safe implementations of SNMP, DHCP, NTP, sensors, and more
* customise the install and improve procedures in your community and undefined, or construct a customized OpenBSD release
Whether you're a brand new person trying to find an entire advent to OpenBSD or an skilled sysadmin trying to find a refresher, Absolute OpenBSD, second Edition provides you with every little thing you want to grasp the intricacies of the world's safest working system.
"The definitive publication on OpenBSD will get a long-overdue refresh."
-Theo de Raadt, OpenBSD Founder
Read Online or Download Absolute OpenBSD: UNIX for the Practical Paranoid (2nd Edition) PDF
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Extra resources for Absolute OpenBSD: UNIX for the Practical Paranoid (2nd Edition)
These systems can still be security risks, so you should include them in your automation system. You have to be aware of conflicts that might arise between your automation system and the user’s own actions. The user might destroy something your system did, in C HA P TER 1 N I N T R O D U C I N G T H E B A S I C S O F A U T O M A T I O N which case the system should do it again automatically. Similarly, your automation might destroy changes the user wanted to make on his or her system—you would have to work with the user to find a different way to make the change.
Allowing Limited Command Execution Suppose you have a script that monitors a set of servers. Root access is not necessary for monitoring the systems. The script does, however, need to reboot the machines in some C HA P TER 3 N US ING S S H TO A U T O M A T E S Y S T E M A D M I N I S T R A T I O N S E C U R E L Y cases, which does require root access. The following configuration, when placed in znkkp+ ]qpdkneva`[gauo, allows this specific key to reboot the system and nothing more: jk)lknp)bkns]n`ejc(_kii]j`9+o^ej+na^kkp(jk)lpu ood)no]=>***UV Whoever possesses the specified private key cannot open an interactive shell or forward ports.
What happens if some systems are currently unavailable? Are they just forgotten? This is where the pull method really shines. If you make a change to one or more configuration servers, all your systems will pick up those changes when they can. If a system is a laptop at somebody’s home, it might not get the changes until the next day. If a system has hardware problems, it might not get the changes until the next week. But all your systems will eventually have the changes applied—and most almost immediately.
Absolute OpenBSD: UNIX for the Practical Paranoid (2nd Edition) by Michael W. Lucas