Content-type: text/html Man page of SYSLOG-NG


Section: Maintenance Commands (8)
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syslog-ng - logs system messages  


NOTE: This file is not up to date. Please refer to the html documentation.

syslog-ng [ -dFsvV ] [ -f <config-filename> ] [ -p <pid-filename> ] [ -C <chroot-dir> ] [ -u <user> ] [ -g <group> ]  


syslog-ng reads and logs messages to the system console, log files, other machines and/or users as specified by its configuration file.

The configuration file is read at startup and is reread after receipt of a hangup (HUP) signal. When reloading the configuration file, all destination files are closed and reopened as appropriate. For more information about the configuration file, see syslog-ng.conf(5).

Typically messages are sent to syslog-ng via a Unix domain socket (/dev/log) or via UDP, to port 514 or to whatever syslog/udp is defined to be in /etc/services. To receieve messages from the kernel, /dev/klog is opened for reading.

Messages sent to syslog-ng should be an entire line, prefixed by a priority code in between '<' and '>'. Definititions of the recognised values can be found in the include file <sys/syslog.h>.

syslog-ng can be configured to pass messages on to other syslog-ng's and when doing so, it sends the message on with the priority as a prefix.

It is not necessary to terminate a message with a line feed or carriage return.



-C  <directory>, --chroot=<directory>
Chroot to directory.
-d, --debug
Set "debug mode". Prints out various messages to aid in debugging and stops it from becoming a daemon. To activate debugging in the yacc parser, either use this option twice or combine with -v.
-F, --foreground
Don't fork into background.
-f  <filename>, --cfgfile=<filename>
Instead of reading the normal /etc/syslog-ng/syslog-ng.conf file for configuration information, use the filename given instead.
-g  <group>, --group=<group>
Switch to group.
-p  <filename>, --pidfile=<filename>
Write the current PID information to the specified file. Defaults to /var/run/
-s, --syntax-only
Only read and parse the configuration file. See also the option -f.
-u  <user>, --group=<user>
Switch to user.
-v, --verbose
Enable verbose mode. Process will not become a daemon. Prints out fewer messages, compared to -d.
-V, --version
Print the version number.


It is expected that syslog-ng will run as root, however, if not running on a priviledged port of it it owned its own log directories, etc, it might run as a non-root user.  


syslog-ng.conf(5), logger(1), syslog(2), syslog(3), services(5), syslog.conf(5), klogd(8), syslogd(8), sysklogd(8)  


Configuration file for syslog-ng. See syslog-ng.conf(5) for more information.
The file containing the process id of syslog-ng.


If you find any, please send email to the syslog-ng mailing list at




This document was created by man2html, using the manual pages.
Time: 04:17:51 GMT, September 24, 2010