Use this documentation with care! It describes the heavily outdated version 5, which was actively developed around 2010 and is considered dead by the rsyslog team for many years now.

This documentation reflects the latest update of the previously existing (now removed) v5-stable branch. It describes the 5.10.2 version, which was never released. As such, it contains some content that does not apply to any released version.

To obtain the doc that properly matches your installed v5 version, obtain the doc set from your distro. Each version of rsyslog contained the version that exactly matches it.

As general advise, it is strongly suggested to upgrade to the current version supported by the rsyslog project. The current version can always be found on the right-hand side info box on the rsyslog web site.

Note that there is no rsyslog community support available for this heavily outdated version. If you need to stick with it, please ask your distribution for support.


RainerScript supports a currently quite limited set of functions:

  • getenv(str) - like the OS call, returns the value of the environment variable, if it exists. Returns an empty string if it does not exist.
  • strlen(str) - returns the length of the provided string
  • tolower(str) - converts the provided string into lowercase

The following example can be used to build a dynamic filter based on some environment variable:

if $msg contains getenv('TRIGGERVAR') then /path/to/errfile

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