Chapitre 15. Configuring a remote logging solution

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To ensure that logs from various machines in your environment are recorded centrally on a logging server, you can configure the Rsyslog application to record logs that fit specific criteria from the client system to the server.

15.1. The Rsyslog logging service

The Rsyslog application, in combination with the systemd-journald service, provides local and remote logging support in Red Hat Enterprise Linux. The rsyslogd daemon continuously reads syslog messages received by the systemd-journald service from the Journal. rsyslogd then filters and processes these syslog events and records them to rsyslog log files or forwards them to other services according to its configuration.

The rsyslogd daemon also provides extended filtering, encryption protected relaying of messages, input and output modules, and support for transportation using the TCP and UDP protocols.

In /etc/rsyslog.conf, which is the main configuration file for rsyslog, you can specify the rules according to which rsyslogd handles the messages. Generally, you can classify messages by their source and topic (facility) and urgency (priority), and then assign an action that should be performed when a message fits these criteria.

In /etc/rsyslog.conf, you can also see a list of log files maintained by rsyslogd. Most log files are located in the /var/log/ directory. Some applications, such as httpd and samba, store their log files in a subdirectory within /var/log/.

Ressources supplémentaires

  • The rsyslogd(8) and rsyslog.conf(5) man pages.
  • Documentation installed with the rsyslog-doc package in the /usr/share/doc/rsyslog/html/index.html file.
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