Why does auditd report "Audit daemon is low on disk space for logging" warning in messages log ?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5

Issue

  • audtitd daemon reported "Audit daemon is low on disk space for logging" warning in /var/log/messages file.

Resolution

There are different options to overcome this situation:

  • Clear unwanted files from /var to recover free space.
  • Increase the size of /var file system.
  • The /etc/audit/auditd.conf configuration file contains the space_left option which describes numeric value in megabytes that tells the audit daemon when to perform a configurable action because the system is starting to run low on disk space. Check auditd.conf man page for more information on possible actions and their behavior.

Root Cause

  • The /var file system does not have enough free space.
  • The auditd daemon writes "Audit daemon is low on disk space for logging" in messages log file when the log destination file system does not have enough free space.

Diagnostic Steps

  • Corresponding code for this error message:

    if (admin)
         action = config->admin_space_left_action;
         else
         action = config->space_left_action;
         switch (action)
         {
         case FA_IGNORE:
         break;
         case FA_SYSLOG:
         audit_msg(LOG_ALERT,
         "Audit daemon is low on disk space for logging");
         break;
    

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