History
The syslog-ng project began in 1998, when Balázs Scheidler, the primary author of syslog-ng, ported the existing nsyslogd code to Linux. The 1.0.x branch of syslog-ng was still based on the nsyslogd sources and are available in the syslog-ng source archive.
Right after the release of syslog-ng 1.0.x, a reimplementation of the code base started to address some of the shortcomings of nsyslogd and to address the licensing concerns of Darren Reed, the original nsyslogd author. This reimplementation was named stable in the October 1999 with the release of 1.2.0. This time around, syslog-ng depended on some code originally developed for lsh by Niels Möller.
Three major releases (1.2, 1.4 and 1.6) were using this code base, the last release of the 1.6.x branch in February 2007. In this period of about 8 years, syslog-ng became one of the popular alternative syslog implementations.
In a volunteer based effort, yet another rewrite was started back in 2001, dropping lsh code and using the more widely available GLib library. This rewrite of the codebase took its time, the first stable release of 2.0.0 happened in October 2006.
Development efforts were focused on improving the 2.0.x branch; support for 1.6.x was dropped at the end of 2007. Support for 2.X was dropped at the end of 2009, but it is still used in some Linux distributions. Balabit, the company behind syslog-ng, started a parallel, commercial fork of syslog-ng, called syslog-ng Premium Edition. Portions of the commercial income are used to sponsor development of the free version.
Syslog-ng version 3.0 was released in the fourth quarter of 2008.
Starting with the 3.0 version developments efforts were parallel on the Premium and on the Open Source Editions. PE efforts were focused on quality, transport reliability, performance and encrypted log storage. The Open Source Edition efforts focused on improving the flexibility of the core infrastructure to allow more and more different, non-syslog message sources.
Both the OSE & PE forks produced two releases (3.1 and 3.2) in 2010.
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