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SYSLOG-NG-DEBUN

Section: The syslo-n-debun manual pag (1)
Updated: 07/16/2025
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NAME

syslo-n-debun - syslog-ng DEBUg buNdle generator

SYNOPSIS

syslog-ng-debun [options]

DESCRIPTION

NOTE: The syslog-ng-debun application is distributed with the system logging application, and is usually part of the package. The latest version of the application is available at .

This manual page is only an abstract, for the complete documentation of syslog-ng, see m[blue]The syslog-ng Administrator Guidem[][1].

The syslog-ng-debun tool collects and saves information about your installation, making troubleshooting easier, especially if you ask help about your related problem.

GENERAL OPTIONS

-r

: Run syslog-ng-debun. Using this option is required to actually execute the data collection with syslog-ng-debun. It is needed to prevent accidentally running syslog-ng-debun.

-h

: Display the help page.

-l

: Do not collect privacy-sensitive data, for example, process tree, fstab, and so on. If you use with -d, then the following parameters will be used for debug mode:-Fev

-R <directory>

: The directory where is installed instead of /opt/syslog-ng.

-W <directory>

: Set the working directory, where the debug bundle will be saved. Default value: /tmp. The name of the created file is syslog.debun.${host}.${date}.${3-random-characters-or-pid}.tgz

DEBUG MODE OPTIONS

-d

: Start in debug mode, using the -Fedv --enable-core options.
Warning! Using this option under high message load may increase disk I/O during the debug, and the resulting debug bundle can be huge. To exit debug mode, press Enter.

-D <options>

: Start in debug mode, using the specified command-line options. To exit debug mode, press Enter. For details on the available options, see ???.

-t <seconds>

: Run in noninteractive debug mode for <seconds>, and automatically exit debug mode after the specified number of seconds.

-w <seconds>

: Wait <seconds> seconds before starting debug mode.

SYSTEM CALL TRACING

-s

: Enable syscall tracing (strace -f or truss -f). Note that using -s itself does not enable debug mode, only traces the system calls of an already running process. To trace system calls in debug mode, use both the -s and -d options.

PACKET CAPTURE OPTIONS

Capturing packets requires a packet capture tool on the host. The syslog-ng-debun tool attempts to use tcpdump on most platforms, except for Solaris, where it uses snoop.

-i <interface>

: Capture packets only on the specified interface, for example, eth0.

-p

: Capture incoming packets using the following filter: port 514 or port 601 or port 53

-P <options>

: Capture incoming packets using the specified filter.

-t <seconds>

: Run in noninteractive debug mode for <seconds>, and automatically exit debug mode after the specified number of seconds.

EXAMPLES

syslog-ng-debun -r

Create a simple debug bundle, collecting information about your environment, for example, list packages containing the word: syslog, ldd of your syslog-binary, and so on.

syslog-ng-debun -r -l

Similar to syslog-ng-debun -r, but without privacy-sensitive information. For example, the following is NOT collected: fstab, df output, mount info, ip / network interface configuration, DNS resolv info, and process tree.

syslog-ng-debun -r -d

Similar to syslog-ng-debun -r, but it also stops syslog-ng, then restarts it in debug mode (-Fedv --enable-core). To stop debug mode, press Enter. The output of the debug mode collected into a separate file, and also added to the debug bundle.

syslog-ng-debun -r -s

Trace the system calls (using strace or truss) of an already running process.

syslog-ng-debun -r -d -s

Restart in debug mode, and also trace the system calls (using strace or truss) of the process.

syslog-ng-debun -r -p

Run packet capture (pcap) with the filter: port 514 or port 601 or port 53 Also waits for pressing Enter, like debug mode.

syslog-ng-debun -r -p -t 10

Noninteractive debug mode: Similar to syslog-ng-debun -r -p, but automatically exit after 10 seconds.

syslog-ng-debun -r -P "host 1.2.3.4"  -D "-Fev --enable-core"

Change the packet-capturing filter from the default to host 1.2.3.4. Also change debugging parameters from the default to -Fev --enable-core. Since a timeout (-t) is not given, waits for pressing Enter.

syslog-ng-debun -r -p -d -w 5 -t 10

Collect pcap and debug mode output following this scenario:

: * Start packet capture with default parameters (-p)

: * Wait 5 seconds (-w 5)

: * Stop syslog-ng

: * Start syslog-ng in debug mode with default parameters (-d)

: * Wait 10 seconds (-t 10)

: * Stop syslog-ng debugging

: * Start syslog-ng

: * Stop packet capturing

FILES

/usr/local/bin/loggen

AUTHOR

This manual page was written by the Balabit Documentation Team <documentation@balabit.com>.

COPYRIGHT

NOTES

1.

The syslo-ng Administrator Guide

: https://www.balabit.com/support/documentation/

2.

The 4.9 Administrator Guide

: https://www.balabit.com/documents/syslo-n-os-lates-guides/en/syslo-n-os-guid-admin/html/index.html

3.

syslo-ng mailing list

: https://lists.balabit.hu/mailman/listinfo/syslo-ng

4.

syslo-ng blogs

: https://syslo-ng.org/blogs/