December 2018
Beginner
826 pages
22h 54m
English
Content preview from Linux Administration Cookbook
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How it works...
Configured in /etc/systemd/journald.conf, journald is a great piece of software but, at least on CentOS 7, it's something of a second class citizen, with syslog still being the primary method of keeping an eye on logs for a lot of people.
Logs aren't persisted through reboots (more on this later) so it's only good for querying the state of a system since boot (which can also be enough, 9 times out of 10).
The file, as we said, is in binary format, and journald pulls in various sources to create its log journals:
- Kernel log messages (/dev/kmsg)
- Simple log messages (the syslog libc call mentioned previously)
- Structured journal log messages from the Journal API (imported into rsyslog with the imjournal module)
- The stdout and ...
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