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Unix® and Linux® System Administration Handbook, Fourth Edition by Ben Whaley, Trent R. Hein, Garth Snyder, Evi Nemeth

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11. Syslog and Log Files

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System daemons, the kernel, and various utilities and services all emit data that is logged and eventually ends up on your finite-sized disks. Most of that data has a limited useful life and needs to be summarized, compressed, archived, and eventually thrown away. Access and audit data may need to be managed closely according to regulatory retention rules or site security policies.

Experienced administrators review logs sooner rather than later. Log files often contain important hints that point toward the resolution of vexing configuration problems. When a daemon refuses to start or a chronic error continues to plague ...

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