# Concepts

This chapter describes important rsyslog concepts and objects. Where appropriate, it also refers to configurations settings to affect the respective objects.

- Understanding rsyslog Queues
  - Where are Queues Used?
  - Queue Modes
  - Limiting the Queue Size
  - Worker Thread Pools
  - Filled-Up Queues
- The Janitor Process
- Message parsers in rsyslog
  - Intro
  - What are message parsers?
  - How are message parsers used?
  - Which message parsers are available
  - Conclusion
- Multiple Rulesets in rsyslog
  - What is a Ruleset?
  - What does “To bind to a Ruleset” mean?
  - Why are rulesets important for different parser configurations?
  - Can I use a different Ruleset as the default?
  - Rulesets and Queues
  - Examples
  - Performance
  - See Also
- NetStream Drivers
  - Current Network Stream Drivers

See also

Help with configuring/using `Rsyslog`:

- Mailing list - best route for general questions

- GitHub: rsyslog source project - detailed questions, reporting issues that are believed to be bugs with `Rsyslog`

- Stack Exchange (View, Ask) - experimental support from rsyslog community

See also

Contributing to `Rsyslog`:

- Source project: rsyslog project README.

- Documentation: rsyslog-doc project README

Copyright 2008-2020 Rainer Gerhards (Großrinderfeld), and Others.