syslog log file sizes

mscomms · #1 (**permalink**) 06-18-2003

I am logging the messages from a router network and the log files are getting enormous is there any way to limit the size of the log file by either wrapping it or preferably creating a new one and renaiming the old.

Cheers

mike

Optimus_P · #2 (**permalink**) 06-18-2003

you can have a cron job that checks the file size.

i.e.

if [ file_size > preset_size ]; then
copy the file || email the file as an attachment
cat_null_into_the_file_to_clear_it_out > file
fi

Neo · #3 (**permalink**) 06-18-2003

For syslog, try this:

# cat $logfile | gzip -9 > $logfile.$date && > $logfile.

This compresses the file as it rotates it, zeros it out and then keeps the same indoe open to any application that might have it open already.

Make sure that this will do what you want though. For instance, if your log files are buffered, or the app reads in the log file for read/write, this might not work. Works fine for syslog:

From:

http://pcunix.com/Bofcusm/315.html

mscomms · #4 (**permalink**) 06-19-2003

cheers both I will give this a go

mscomms · #5 (**permalink**) 06-19-2003

sorted thanks, here is the complete script

Code:

#!/bin/bash

#######################################################################
#                                                                     #
# Script created mike smith (mike.smith@neosnetworks)                 #
#                                                                     #
#        Last edit 19/06/2003 Ver1                                    #
#######################################################################

# Check logfile is specified in command line

if [ $# -lt 1 ] ; then
        echo
        echo You need to specify the logfile to rotate i.e. /var/syslogs/riverstone
        exit 0
fi

# Set Variables

LOGFILE="$1"
FileDate=`date +%d%m%Y`
OUTFILE=$LOGFILE.$FileDate.gz

#Rotate File

cat $LOGFILE | gzip -9 > $OUTFILE && > $LOGFILE
#

a bit rough and ready but it does the job

Code tags added for readability --- Perderabo

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