June 2025
Beginner to intermediate
1180 pages
37h 48m
English
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14.12 Logging (Syslog)
The kernel, various administration tools (PAM, APT, dpkg) and most network services log events and errors to countless files in /var/log. These logging files are extremely useful during the startup of a new service to find configuration errors. When a server is running, logging files can provide clues to security issues.
To avoid the need for each program to implement its own logging functions, the kernel and a number of admin tools and server services make use of central logging functions, usually referred to as syslog. There are various implementations of syslog; the most popular one currently is rsyslogd.
However, not all network services use syslog. In particular, the “big” server services, such as Apache, CUPS, ...
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