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--- products:ict:linux:logging [2023/10/08 20:24] – wikiadmin
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 Remember to regularly check your logs for important system information and potential issues. Rsyslog provides a flexible and powerful way to manage and centralize your system logs, making it easier to troubleshoot problems and monitor system performance.
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+====== Difference between syslog and rsyslog ======
+Syslog and rsyslog are both components of the system logging infrastructure in Unix and Unix-like operating systems, but there are important differences between them:
+. **Syslog (syslogd):**
+   - **Legacy Daemon:** Syslog, often referred to as `syslogd`, is the original and legacy system logging daemon. It has been around for a long time and is still found on many Unix-based systems.
+   - **Basic Functionality:** Syslog provides basic logging functionality, allowing the logging of messages from various processes and facilities to specified log files or remote servers.
+   - **Limited Features:** Syslog has limited filtering and routing capabilities compared to rsyslog, making it less flexible and versatile.
+. **Rsyslog:**
+   - **Modern Replacement:** Rsyslog is an enhanced and more modern version of syslogd. It was developed to address the limitations of syslog and provide additional features and flexibility.
+   - **Advanced Features:** Rsyslog offers a wide range of advanced features, including flexible message filtering, log message enrichment, support for structured log formats (like JSON), rate limiting, and more.
+   - **Compatibility:** Rsyslog is compatible with traditional syslog configurations, so it can be used as a drop-in replacement for syslogd.
+   - **Modularity:** Rsyslog is highly modular, allowing you to extend its functionality with plugins and modules. This makes it more adaptable to different logging requirements.
+   - **Performance:** Rsyslog is often considered more efficient and scalable than syslogd, making it a better choice for high-performance environments.
+   - **Reliability:** Rsyslog includes features like disk and memory buffers to ensure that log messages are not lost even during high loads or when the logging system experiences temporary issues.
+In summary, while syslogd (syslog) is the older and more basic logging daemon, rsyslog is a more feature-rich and modern replacement. Rsyslog is recommended for systems where advanced logging features, scalability, and reliability are important. However, on some legacy systems, syslogd may still be in use due to its simplicity and widespread adoption.