Absolute OpenBSD: Unix for the Practical Paranoid

Absolute OpenBSD: Unix for the Practical Paranoid

Michael W. Lucas

Language: English

Pages: 536

ISBN: 1593274769

Format: PDF / Kindle (mobi) / ePub

The definitive guide to OpenBSD

Foreword by Henning Brauer, OpenBSD PF Developer

OpenBSD, the elegant, highly secure Unix-like operating system, is widely used as the basis for critical DNS servers, routers, firewalls, and more. This long-awaited second edition of Absolute OpenBSD maintains author Michael Lucas's trademark straightforward and practical approach that readers have enjoyed for years. You'll learn the intricacies of the platform, the technical details behind certain design decisions, and best practices, with bits of humor sprinkled throughout. This edition has been completely updated for OpenBSD 5.3, including new coverage of OpenBSD's boot system, security features like W^X and ProPolice, and advanced networking techniques.

You'll learn how to:

  • Manage network traffic with VLANs, trunks, IPv6, and the PF packet filter
  • Make software management quick and effective using the ports and packages system
  • Give users only the access they need with groups, sudo, and chroots
  • Configure OpenBSD's secure implementations of SNMP, DHCP, NTP, hardware sensors, and more
  • Customize the installation and upgrade processes for your network and hardware, or build a custom OpenBSD release

Whether you're a new user looking for a complete introduction to OpenBSD or an experienced sysadmin looking for a refresher, Absolute OpenBSD, 2nd Edition will give you everything you need to master the intricacies of the world's most secure operating system.

"The definitive book on OpenBSD gets a long-overdue refresh."

-Theo de Raadt, OpenBSD Founder

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On the disk, in bytes. The 6 b size is the size of a block on disk, in bytes. Finally, 7 cpg shows the number of cylinders per cylinder group. Anytime you feel confused in the disk partitioning process, print your current disklabel and compare it to your notes on how you want the partitioning to look. Now that you can see what the disk partitioning looks like, let's add a partition or four. Adding Partitions This IDE drive is 20GB, and I want to divide it as follows. • 500MB root • 500MB.

Partition per operating system! It's perfectly safe to assign the "a" partition to /database, and on the third drive you can assign it to /home without a problem. Other Disklabel Operations The disklabel editor is extraordinarily powerful and will let you do many things. Most of these functions should never be necessary, but are available if you need them. disklabel(8) also has many functions that are not intended for use when installing a system, but are useful when working with disks on a.

Sectors 500.0MB in 64 cyl groups (16 c/g, 7.88MB/g, 1920 i/g) Once all of your partitions have been formatted, you'll see the mount point and mount option information for each partition. /dev/wd0a on /mnt type ffs (rw, asynchronous, local, ctime=Sun Oct 13 12:59:20 2002) /dev/sd0a on /mnt/database type ffs (rw, asynchronous, local, nodev, nosuid, ctime=Sun Oct 13 12:59:20 2002) ... Note that OpenBSD 3.2 and later mounts everything but / nodev and nosuid. Thanks to the systrace mechanism.

Mount(8) have many more options; check out Chapter 18 for the most common ones or the man page for the full gory details.) # fsck -p # mount -a Once you're in single-user mode and have your file systems mounted, all of the usual commandline functions should be available. You can edit configuration files, start and stop programs, and generally do whatever you like. What exactly you want to do depends on exactly what your problem is. Starting the Network in Single-User Mode The shell script.

Way or you need to configure an add-on access control tool. Only give the root password to those users you trust. All other users should be given access to particular tasks via sudo(8). Using the Root Password The su(1) command allows one user to become another user, if you have that user's password. I could use Chris's password to access Chris's account, just as if I was him. I could use Phil's password to effectively become Phil. Or, I could use the root password to become root. Using su is.

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