auditd is the userspace component to the Linux Auditing System. It's
responsible for writing audit records to the disk. Viewing the logs
is done with the ausearch or aureport utilities. Configuring the
audit system or loading rules is done with the auditctl utility.
During startup, the rules in /etc/audit/audit.rules are read by
auditctl and loaded into the kernel. Alternately, there is also an
augenrules program that reads rules located in /etc/audit/rules.d/
and compiles them into an audit.rules file. The audit daemon itself
has some configuration options that the admin may wish to customize.
They are found in the auditd.conf file.
-f leave the audit daemon in the foreground for debugging.
Messages also go to stderr rather than the audit log.
-l allow the audit daemon to follow symlinks for config files.
-n no fork. This is useful for running off of inittab or systemd.
specify when starting if auditd should change the current
value for the kernel enabled flag. Valid values for
ENABLE_STATE are "disable", "enable" or "nochange". The
default is to enable (and disable when auditd terminates). The
value of the enabled flag may be changed during the lifetime
of auditd using 'auditctl -e'.
SIGHUP causes auditd to reconfigure. This means that auditd re-reads
the configuration file. If there are no syntax errors, it will
proceed to implement the requested changes. If the reconfigure
is successful, a DAEMON_CONFIG event is recorded in the logs.
If not successful, error handling is controlled by
space_left_action, admin_space_left_action, disk_full_action,
and disk_error_action parameters in auditd.conf.
caused auditd to discontinue processing audit events, write a
shutdown audit event, and exit.
causes auditd to immediately rotate the logs. It will consult
the max_log_file_action to see if it should keep the logs or
causes auditd to attempt to resume logging. This is usually
needed after logging has been suspended.
/etc/audit/auditd.conf - configuration file for audit daemon
/etc/audit/audit.rules - audit rules to be loaded at startup
/etc/audit/rules.d/ - directory holding individual sets of rules to
be compiled into one file by augenrules.
A boot param of audit=1 should be added to ensure that all processes
that run before the audit daemon starts is marked as auditable by the
kernel. Not doing that will make a few processes impossible to
The audit daemon can receive audit events from other audit daemons
via the audisp-remote audispd plugin. The audit daemon may be linked
with tcp_wrappers to control which machines can connect. If this is
the case, you can add an entry to hosts.allow and deny.
This page is part of the audit (Linux Audit) project. Information
about the project can be found at
⟨http://people.redhat.com/sgrubb/audit/⟩. If you have a bug report
for this manual page, send it to email@example.com. This page
was obtained from the project's upstream Git repository
⟨https://github.com/linux-audit/audit-userspace.git⟩ on 2017-03-13.
If you discover any rendering problems in this HTML version of the
page, or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to firstname.lastname@example.org
Red Hat Sept 2013 AUDITD(8)