syslog-ng

syslog-ng is an enhanced log daemon, supporting a wide range of input and output methods: syslog, unstructured text, message queues, databases (SQL and NoSQL alike), and more.

Quickstart

The simplest configuration accepts system logs from /dev/log (from applications or forwarded by systemd) and writes everything to a single file:

This one additionally processes logs from the network (TCP/514 by default):

This config is designed for structured/application logging, using local submission via JSON, and outputting in key=value format:

To submit a structured log using

, you might run:

In which case the resulting message will be:

For a brief introduction to configuring the syslog-ng application, see the quickstart guide.

Features

• Receive and send RFC3164 and RFC5424 style syslog messages
• Receive and send JSON formatted messages
• Work with any kind of unstructured data
• Classify and structure logs using built-in parsers (csv-parser(), db-parser(), kv-parser(), etc.)
• Normalize, crunch, and process logs as they flow through the system
• Hand over logs for further processing using files, message queues (like AMQP), or databases (like PostgreSQL or MongoDB)
• Forward logs to big data tools (like Elasticsearch, Apache Kafka, or Apache Hadoop)

Performance

• syslog-ng provides performance levels comparable to a large cluster when running on a single node
• In the simplest use case, it scales up to 600-800k messages per second
• But classification, parsing, and filtering still produce several tens of thousands of messages per second

Community

• syslog-ng is developed by a community of volunteers, the best way to contact us is via our github project page project, our gitter channel or our mailing list.
• syslog-ng is integrated into almost all Linux distributions and BSDs, it is also incorporated into a number of products, see our powered by syslog-ng page for more details.

Sponsors

• Balabit is the original commercial sponsor of the syslog-ng project, and was acquired by One Identity in 2018. One Identity offers a commercial edition for syslog-ng, called the syslog-ng Premium Edition.
• Axoflow is the company of Balazs Scheidler, the original creator and main developer of syslog-ng.

Feedback

We are really interested to see who uses our software, so if you do use it and you like what you see, please tell us about it. A star on github or an email saying thanks means a lot already, but telling us about your use case, your experience, and things to improve would be much appreciated.

Just send an email to feedback (at) syslog-ng.org.

Feedback Powers Open Source.

Installation from source

Releases and precompiled tarballs are available on GitHub.

To compile from source, the easiest is to use

, a docker based, self-hosted compile/build/release infrastructure within the source tree. See

dbld/README.md

for more information.

For the brave souls who want to compile syslog-ng from scratch, the usual drill applies:

$ ./configure && make && make install

The extra effort in contrast with the dbld based build is the need to fetch and install all build dependencies of syslog-ng (of which there are a few).

If you don't have a configure script (because of cloning from git, for example), run

./autogen.sh

to generate it.

Some of the functionality of syslog-ng is compiled only if the required development libraries are present. The configure script displays a summary of enabled features at the end of its run. For details, see the syslog-ng compiling instructions.

Installation from binaries

Binaries are available in various Linux distributions and contributors maintain packages of the latest and greatest syslog-ng version for various OSes.

Debian/Ubuntu

Simply invoke the following command as root:

The latest versions of syslog-ng are available for a wide range of Debian and Ubuntu releases from our APT repository.

The packages and the APT repository are provided "as is" without warranty of any kind, on a best-effort level.

Supported distributions

syslog-ng packages are released for the following distribution versions:

Adding the APT repository

1. Download and store the release signing key:

   with newer apt (like on Debian 13 - Trixie)

2. Add the repository containing the latest stable build of syslog-ng to your APT sources. For example if you are running Debian 13 on ARM64, you would use

   debian-trixie-arm64
   (see chart above) NOTE: For X86-64 you do not have to use any postfix, so, for Debian 13 on X86-64, you should simply use
   debian-trixie
   .

   on newer OSes (like on Debian 13 - Trixie)

3. Update your repositories with

4. Now install syslog-ng:

Nightly builds

Nightly packages are built and released from the git

branch everyday.

Use

instead of

stable

in step 2 to use the nightly APT repository. e.g.:

Nightly builds can be used for testing purposes (obtaining new features and bugfixes) at the risk of breakage.

RHEL

Simply invoke the following command as root:

The latest versions of syslog-ng are available for a wide range of RHEL releases from our DNF repository.

The packages and the DNF repository are provided "as is" without warranty of any kind, on a best-effort level.

Supported distributions

syslog-ng packages are released for the following distribution versions:

Adding the DNF repository

1. Download and install the repository definition:

2. Refresh repsitory metadata:

3. Now install syslog-ng:

Nightly builds

Nightly packages are built and released from the git

branch everyday.

Use

instead of

stable

in step 1 to use the nightly DNF repository. E.g.:

Nightly builds can be used for testing purposes (obtaining new features and bugfixes) at the risk of breakage.

Arch Linux

Fedora

syslog-ng is available as a Fedora package that you can install using dnf:

You can download packages for the latest versions from here.

For instructions on how to install syslog-ng on RPM distributions, see the blog post Installing latest syslog-ng on RHEL and other RPM distributions.

If you wish to install the latest RPM package that comes from a recent commit in Git for testing purposes, read the blog post, RPM packages from syslog-ng Git HEAD.

macOS

Others

Binaries for other platforms are listed on the official third party page.

Installation from Docker image

Binaries are also available as a Docker image. You can get:

• the latest official release with

  docker pull balabit/syslog-ng:latest

• the latest developer nigthly build with

  docker pull balabit/syslog-ng:nightly

Documentation

For the latest, markdown based version, see the syslog-ng documentation center.
The official documentation of the earlier versions (3.X) of syslog-ng Open Source Edition provided by One Identity is available here.

Contributing

If you would like to contribute to syslog-ng, to fix a bug or create a new module, the syslog-ng developer pages helps you take the first steps to working with the code base.