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syslog-ng(8) The syslog-ng OSE manual page syslog-ng(8) NAME syslog-ng - syslog-ng system logger application SYNOPSIS syslog-ng [options] DESCRIPTION This manual page is only an abstract. The syslog-ng OSE application is a flexible and highly scalable system logging application. Typically, syslog-ng OSE is used to manage log messages and implement centralized logging, where the aim is to collect the log messages of several devices on a single, central log server. The different devices - called syslog-ng OSE clients - all run sys- log-ng OSE, and collect the log messages from the various applications, files, and other sources. The clients send all important log messages to the remote syslog-ng OSE server, where the server sorts and stores them. OPTIONS --caps Run syslog-ng OSE process with the specified POSIX capability flags. • If the --no-caps option is not set, syslog-ng OSE has been compiled with the --enable-linux-caps compile option, and the host supports CAPSYSLOG, syslog-ng OSE uses the following ca- pabilities: "capnetbindservice, capnetbroadcast, capnetraw, capdacreadsearch, capdacoverride, capchown, capfowner=p cap- syslog=ep" • If the --no-caps option is not set, and the host does not sup- port CAPSYSLOG, syslog-ng OSE uses the following capabilities: "capnetbindservice, apnetbroadcast, capnetraw, capdacread- search, capdacoverride, capchown, capfowner=p capsys_admin=ep" For example: /usr/local/sbin/syslog-ng -Fv --caps cap_sys_admin,cap_chown,cap_dac_override,cap_net_bind_service,cap_fowner=pi NOTE: The capabilities are not case sensitive, the following command is also good: /usr/local/sbin/syslog-ng -Fv --caps CAP_SYS_ADMIN,CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_NET_BIND_SERVICE,CAP_FOWNER=pi For details on the capability flags, see the following man pages: cap_from_text(3) and capabilities(7) --cfgfile <file> or -f <file> Use the specified configuration file. --chroot <dir> or -C <dir> Change root to the specified directory. The configuration file is read after chrooting so, the configuration file must be available within the chroot. That way it is also possible to reload the syslog-ng OSE configuration after chrooting. However, note that the --user and --group options are resolved before chrooting. --check-startup Available in syslog-ng OSE 4.5 and later versions. This option can be used to perform a complete configuration ini- tialization with syslog-ng OSE, then exit with the exit code indicating the result. This option can also be used to check if the configuration is semantically valid and that syslog-ng OSE can actually start. (The --syntax-only option catches only syntactical errors.) Furthermore, --check-startup can also be used in a Kubernetes envi- ronment, to run it as a dedicated configuration check container. NOTE: This option is highly likely to fail if another syslog-ng OSE in- stance is running in the background, since it initializes several processes, such as network listeners. In such a case, the network ad- dress would already be in use. --control <file> or -c <file> Set the location of the syslog-ng OSE control socket. Default value: /var/run/syslog-ng.ctl --debug or -d Start syslog-ng OSE in debug mode. --default-modules A comma-separated list of the modules that are loaded automati- cally. Modules not loaded automatically can be loaded by including the @module <modulename> statement in the syslog-ng OSE configuration file. Available only in syslog-ng OSE version 4.1 and later. --enable-core Enable syslog-ng OSE to write core files in case of a crash to help support and debugging. --fd-limit <number> Set the minimal number of required file descriptors (fd-s). This sets how many files syslog-ng OSE can keep open simultaneously. Default value: 4096. NOTE: This does not override the global ulimit setting of the host. --foreground or -F Do not daemonize, run in the foreground. When running in the fore- ground, syslog-ng OSE starts from the current directory (${CWD}) so it can create core files (normally, syslog-ng OSE starts from ${PRE- FIX}/var). --group <group> or -g <group> Switch to the specified group after initializing the configuration file. --help or -h Display a brief help message. --module-registry Display the list and description of the available modules. NOTE: Not all of these modules are loaded automatically, only the ones specified in the --default-modules option. Available only in syslog-ng OSE 4.0 and later. --no-caps Run syslog-ng OSE as root, without capability-support. This is the default behavior. On Linux, it is possible to run syslog-ng OSE as non-root with capability-support if syslog-ng OSE was compiled with the --enable-linux-caps option enabled. (Run syslog-ng --version to display the list of enabled build parameters.) To run syslog-ng OSE with specific capabilities, use the --caps op- tion. --persist-file <persist-file> or -R <persist-file> Set the path and name of the syslog-ng.persist file where the per- sistent options and data are stored. --pidfile <pidfile> or -p <pidfile> Set path to the PID file where the pid of the main process is stored. --preprocess-into <output-file> After processing the configuration file and resolving included files and variables, write the resulting configuration into the speci- fied output file. Available only in syslog-ng OSE 4.0 and later. --process-mode <mode> Sets how to run syslog-ng OSE: in the foreground (mainly used for debugging), in the background as a daemon, or in safe-background mode. By default, syslog-ng OSE runs in safe-background mode. This mode cre- ates a supervisor process called supervising syslog-ng OSE, that restarts syslog-ng OSE if it crashes. --stderr or -e Log internal messages of syslog-ng OSE to stderr. Mainly used for debugging purposes in conjunction with the --foreground option. If not specified, syslog-ng OSE will log such messages to its internal source. --syntax-only or -s Verify that the configuration file is syntactically correct and exit. --user <user> or -u <user> Switch to the specified user after initializing the configuration file (and optionally chrooting). NOTE: It is not possible to reload the syslog-ng OSE configuration if the specified user has no privilege to create the /dev/log file. --verbose or -v Enable verbose logging used to troubleshoot syslog-ng OSE. --version or -V Display version number and compilation information, and also the list and short description of the available modules. For detailed de- scription of the available modules, see the --module-registry option. NOTE: Not all of these modules are loaded automatically, only the ones specified in the --default-modules option. --worker-threads Sets the number of worker threads syslog-ng OSE can use, including the main syslog-ng OSE thread. See the syslog-ng OSE Administrator Guide[1] for details. NOTE: Certain operations in syslog-ng OSE can use threads that are not limited by this option. This setting has effect only when syslog-ng OSE is running in multithreaded mode. Available only in syslog-ng OSE 4.0 and later. FILES /usr/local/ /usr/local/etc/syslog-ng.conf SEE ALSO syslog-ng.conf(5) NOTE: If you experience any problems or need help with syslog-ng OSE, see the syslog-ng OSE Administration Guide[1], or visit the syslog-ng OSE mailing list[2]. For news and notifications about syslog-ng OSE, visit the syslog-ng OSE blogs[3]. AUTHOR This manual page was generated from the syslog-ng OSE Administration Guide[1], which was written by several contributors to whom we'd like to extend our sincere thanks. COPYRIGHT NOTES [1] syslog-ng OSE Administration Guide <https://syslog-ng.github.io/admin-guide/README> [2] syslog-ng OSE mailing list <https://lists.balabit.hu/mailman/listinfo/syslog-ng> [3] syslog-ng OSE blogs <https://syslog-ng.com/blog/> 4.9.0 03 September 2025 syslog-ng(8)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | SEE ALSO | AUTHOR | COPYRIGHT | NOTES
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