cvs commit: src/usr.sbin/syslogd syslogd.c

Brooks Davis brooks at
Tue Apr 11 18:46:01 UTC 2006

On Fri, Mar 31, 2006 at 09:06:32AM +0000, Robert Watson wrote:
> On Fri, 31 Mar 2006, Peter Jeremy wrote:
> >On Thu, 2006-Mar-30 21:04:52 +0000, Christian S.J. Peron wrote:
> >> This change allows syslogd to ignore ENOSPC space errors, so that when 
> >> the
> >> filesystem is cleaned up, syslogd will automatically start logging again
> >> without requiring the reset. This makes syslogd(8) a bit more reliable.
> >
> >My sole concern with this is that this means that syslogd will keep trying 
> >to write to the full filesystem - and the kernel will log the attempts to 
> >write to a full filesystem.  Whilst there's rate limiting in the kernel, 
> >this sort of feedback loop is undesirable.
> What I'd like to see is an argument to syslogd to specify a maximum full 
> level for the target file system.  Log data is valuable, but being able to 
> write to /var/tmp/vi.recover is also important.  syslogd -l 90% could 
> specify that sylogd should not write log records, perhaps other than an 
> "out of space record" to a log file on a file system with >=90% capacity.  
> This prevents the kernel from spewing about being out of space also.  The 
> accounting code does exactly this, for identical reasons.

Anyone working on an implementation of this?  I just had more machines
blow up due to out of control logs from a crashing process in an
infinite coredump loop so I'll take a shot at it if someone else isn't.

IMO, what's really important is to keep enough space that newsyslog can
do it's job.  I have plenty of log file that should compress at better
than 10:1 since they are all the same two lines over and over, but it
doesn't do any good when newsyslog can't compress the file and create a
new one.

-- Brooks

Any statement of the form "X is the one, true Y" is FALSE.
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