289 lines
7.2 KiB
Groff
289 lines
7.2 KiB
Groff
.\" This file contains changes from the Open Software Foundation.
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.\"
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.\" from: @(#)newsyslog.8
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.\" $Id: newsyslog.8,v 1.18 1999/04/10 15:09:07 chuckr Exp $
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.\"
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.\" Copyright 1988, 1989 by the Massachusetts Institute of Technology
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.\"
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.\" Permission to use, copy, modify, and distribute this software
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.\" and its documentation for any purpose and without fee is
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.\" hereby granted, provided that the above copyright notice
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.\" appear in all copies and that both that copyright notice and
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.\" this permission notice appear in supporting documentation,
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.\" and that the names of M.I.T. and the M.I.T. S.I.P.B. not be
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.\" used in advertising or publicity pertaining to distribution
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.\" of the software without specific, written prior permission.
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.\" M.I.T. and the M.I.T. S.I.P.B. make no representations about
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.\" the suitability of this software for any purpose. It is
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.\" provided "as is" without express or implied warranty.
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.\"
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.Dd January 27, 1999
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.Dt NEWSYSLOG 8
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.Os
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.Sh NAME
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.Nm newsyslog
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.Nd maintain system log files to manageable sizes
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.Sh SYNOPSIS
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.Nm newsyslog
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.Op Fl Fnrv
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.Op Fl f Ar config_file
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.Sh DESCRIPTION
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.Nm Newsyslog
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is a program that should be scheduled to run periodically by
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.Xr cron 8 .
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When it is executed it archives log files if necessary. If a log file
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is determined to require archiving,
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.Nm
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rearranges the files so that
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.Dq Va logfile
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is empty,
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.Dq Va logfile Ns Li \&.0
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has
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the last period's logs in it,
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.Dq Va logfile Ns Li \&.1
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has the next to last
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period's logs in it, and so on, up to a user-specified number of
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archived logs. Optionally the archived logs can be compressed to save
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space.
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.Pp
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A log can be archived for three reasons:
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.Bl -enum -offset indent
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.It
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It is larger than the configured size (in kilobytes).
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.It
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A configured number of hours have elapsed since the log was last
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archived.
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.It
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This is the specific configured hour for rotation of the log.
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.El
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The granularity of
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.Nm
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is dependent on how often it is scheduled to run by
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.Xr cron 8 .
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Since the program is quite fast, it may be scheduled to run every hour
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without any ill effects,
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and mode three (above) assumes that this is so.
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.Pp
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When starting up,
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.Nm
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reads in a configuration file to determine which logs may potentially
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be archived.
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By default, this configuration file is
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.Pa /etc/newsyslog.conf .
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Each line of the file contains information about a particular log file
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that should be handled by
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.Nm newsyslog .
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Each line has five mandatory fields and four optional fields, with a
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whitespace separating each field. Blank lines or lines beginning with
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``#'' are ignored. The fields of the configuration file are as
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follows:
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.Pp
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.Bl -tag -width indent
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.It Ar logfile_name
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Name of the system log file to be archived.
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.It Ar owner:group
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This optional field specifies the owner and group for the archive file.
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The ":" is essential, even if the
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.Ar owner
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or
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.Ar group
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field is left blank. The field may be numeric, or a name which is
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present in
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.Pa /etc/passwd
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or
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.Pa /etc/group .
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.It Ar mode
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Specify the mode of the log file and archives.
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.It Ar count
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Specify the number of archive files to be kept
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besides the log file itself.
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.It Ar size
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When the size of the log file reaches
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.Ar size
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in kilobytes,
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the log file will be trimmed as described above. If this field
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is replaced by an asterisk
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.Pq Ql \&* ,
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then the size of the log file is not taken into account
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when determining when to trim the log file.
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.It Ar when
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The
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.Ar when
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field can consist of an interval, a specific time, or both. If
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the
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.Ar when
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field is an asterisk
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.Pq Ql \&*
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log rotation will depend only on the contents of the
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.Ar size
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field.
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Otherwise, the
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.Ar when
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field consists of an optional interval in hours, optionally followed
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by an
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.So Li \&@ Sc Ns No -sign
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and a time in a restricted
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.Tn ISO 8601
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format. If a time is specified, the log file will only be trimmed
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if
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.Nm newsyslog
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is run within one hour of the specified time. If an
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interval is specified, the log file will be trimmed if that many hours have
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passed since the last rotation. When both a time and an interval are
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specified, both conditions must be satisfied for the rotation to take
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place.
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.Pp
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The particular format of the time is
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.Sm off
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.Oo
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.Oo
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.Oo
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.Oo
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.Oo
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.Va \&cc
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.Oc
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.Va \&yy
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.Oc
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.Va \&mm
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.Oc
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.Va \&dd
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.Oc
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.Oo
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.Li \&T
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.Oo
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.Va \&hh
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.Oo
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.Va \&mm
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.Oo
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.Va \&ss
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.Oc
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.Oc
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.Oc
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.Oc
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.Oc .
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.Sm on
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Optional date fields default to the appropriate component of the
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current date; optional time fields default to midnight; hence if today
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is January 22, 1999, the following date specifications are all
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equivalent:
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.Pp
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.Bl -item -compact -offset indent
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.It
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.Sq Li 19990122T000000
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.It
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.Sq Li 990122T000000
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.It
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.Sq Li 0122T000000
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.It
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.Sq Li 22T000000
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.It
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.Sq Li T000000
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.It
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.Sq Li T0000
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.It
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.Sq Li T00
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.It
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.Sq Li 22T
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.It
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.Sq Li \&T
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.It
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.Sq Li \&
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.El
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.Pp
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There is no provision for specification of a timezone. There is
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little point in specifying an explicit minutes or seconds component in
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the current implementation, since the only comparison is `within the
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hour'.
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.It Ar flags
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This optional field specifies if the archive should have any
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special processing done to the archived log files.
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The
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.Ar Z
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flag will make the archive files compress to save space by
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using
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.Xr gzip 1 .
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The
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.Ar B
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flag means that the file is a binary file, and so the
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.Tn ASCII
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message which
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.Nm
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inserts to indicate the fact that the logs have been
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turned over should not be included. The
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.Ar -
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flag means nothing, but can be used as a placeholder when the
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.Ar path_to_pid_file
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field is specified.
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.It Ar path_to_pid_file
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This optional field specifies
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the file name to read to find the daemon process id. If this
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field is present, a
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.Ar signal_number
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is sent the process id contained in this
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file. This field must start with "/" in order to be recognized
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properly.
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.It Ar signal_number
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This optional field specifies
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the signal number will be sent to the daemon process. By default
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a SIGHUP will be sent.
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.El
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.Sh OPTIONS
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The following options can be used with newsyslog:
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.Bl -tag -width indent
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.It Fl f Ar config_file
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Instruct newsyslog to use
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.Ar config_file
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instead of
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.Pa /etc/newsyslog.conf
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for its configuration file.
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.It Fl v
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Place
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.Nm
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in verbose mode. In this mode it will print out each log and its
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reasons for either trimming that log or skipping it.
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.It Fl n
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Cause
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.Nm
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not to trim the logs, but to print out what it would do if this option
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were not specified.
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.It Fl r
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Remove the restriction that
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.Nm
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must be running as root. Of course,
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.Nm
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will not be able to send a HUP signal to
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.Xr syslogd 8
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so this option should only be used in debugging.
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.It Fl F
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Force
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.Nm
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to trim the logs, even if the trim conditions have not been met. This
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option is useful for diagnosing system problems by providing you with
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fresh logs that contain only the problems.
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.El
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.Sh FILES
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.Bl -tag -width /etc/newsyslog.confxxxx -compact
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.It Pa /etc/newsyslog.conf
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.Nm
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configuration file.
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.El
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.Sh BUGS
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Doesn't yet automatically read the logs to find security breaches.
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.Sh AUTHORS
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.An Theodore Ts'o ,
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MIT Project Athena
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.Pp
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Copyright 1987, Massachusetts Institute of Technology
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.Sh COMPATIBILITY
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Previous versions of the chown utility used the dot (``.'') character to
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distinguish the group name.
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Begining with
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.Fx 4.0 ,
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this has been changed to be a colon (``:'') character so that user and group
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names may contain the dot character.
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.Sh "SEE ALSO"
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.Xr gzip 1 ,
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.Xr syslog 3 ,
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.Xr chown 8 ,
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.Xr syslogd 8
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