Linux/logging

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Linux logs are save usually in /var/log folder. Most linux distribution uses syslog, syslog-ng or rsyslog software for logging or sending them to remote servers. Analytics and visualisation software such a Elasticsearch and Kibana can be used for log inspection.

Usage by Distribution:

  • Debian/Ubuntu: rsyslog
  • RHEL/Fedora:

Standard logs:

  • Debian/Ubuntu: /var/log/syslog
  • RHEL/Fedora: /var/log/message

SSH sessions logging:

  • Debian/Ubuntu: /var/log/auth.log
  • RHEL/Fedora: /var/log/secure

Rsyslog[edit]

Rsyslogd supports queued operations to handle offline outputs. Official documentation: https://www.rsyslog.com/doc/v8-stable/configuration/index.html

Rsyslog Configuration[edit]

Default configuration files by Distribution:

Docker[edit]

docker logs command show docker logs. See also https://stackoverflow.com/questions/30969435/where-is-the-docker-daemon-log/30970134#30970134 for further information about docker logs.

See also[edit]