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System Administration
Unix System Administration class taught at the University of Colorado that focuses on OpenBSD.
www.cs.colorado.edu/

OpenBSD: Administration Functionality
A table displaying common services with the name of the program in OpenBSD, how to manage system services, configuration files locations and additional notes.
www.darwinsys.com/

Soft Updates v. Journaling
Whitepaper exploring the benefits of Soft Updates and journaling, comparing their behavior on both micro-benchmarks and workload-based macrobenchmarks.
www.usenix.org/

SMTP AUTH Mini-HOWTO
Describes how to set up Sendmail with SMTP AUTH [RFC 2554] support on OpenBSD.
www.gnutec.com/

Opening the Source Repository with Anonymous CVS
Whitepaper by OpenBSD founder, Theo de Raadt, and AT&T researcher, Charles D. Cranor, describing the development and concepts of the Anonymous CVS source file distribution mechanism.
www.usenix.org/

Soft Updates
Whitepaper by Marshall Kirk McKusick and Gregory R. Ganger on eliminating synchronous writes in the Fast Filesystem. Included in OpenBSD since OpenBSD 2.7 Release.
www.usenix.org/

PureBSD
Information and HOWTOs for OpenBSD.
www.purebsd.com/

proctools
Provides the pgrep and pkill commands, which, respectively, scan for and send signals to processes that are matched by command line options.
sourceforge.net/

PXE daemon
Implementation of the Intel PXE bootstrap protocol for OpenBSD.
www.kano.org.uk/

Stephanie
Hardening OpenBSD for multiuser environments. Mike Schiffman (a.k.a route) gives us Trusted Path Execution patches for 2.8 and 2.9.
www.packetfactory.net/