Finding logs, using journald, and reading log files, including log preservation and rotation
In this section, you will learn how to review a system's status via logs.
Previously in this chapter, we learned how to manage system services via systemd, check their status, and check their logs. Traditionally, the different daemons and system components used to create files under the /var/log/ folder are based on the name of the daemon or service. If the service used to create several logs, it would do so inside a folder for the service (for example, httpd or samba).
The system log daemon, rsyslogd, has a new systemd partner, named systemd-journald.service, that also stores logs, but instead of using the traditional plain text format, it uses binary format, which can be queried via the journalctl command.
It's really important to get used to reading the log files as it's the basis for troubleshooting, so let's learn about general logging and how to use it.
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