How does a day in a life of an Apache log message in modern systemd based Linux system look like? I would expect it to be something like that:

  1. Apache daemon writes a log message using syslog(3)
  2. this log message is written to /run/systemd/journal/dev-log
  3. systemd-journald reads the log message from /run/systemd/journal/dev-log
  4. systemd-journald writes it to /run/systemd/journal/syslog
  5. rsyslogd or syslog-ng listen on /run/systemd/journal/syslog, get the message and then process it based on their configuration

Am I missing something? Is it possible that Apache logs(for example access log messages) directly to files, bypassing the whole logging system altogether?

up vote 8 down vote accepted
+100

It depends on the Apache configuration. As documented in mod_log_config, CustomLog can be used to send logs directly a file or pipe them to a command. That command could in turn pipe the contents on to a syslog daemon or even into the systemd journal.

The not-yet-released Apache 2.5 allows logging directly to systemd via mod_journald.

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