{{tag>linux debian log rotate logrotate cron crontab}}
======logrotate======
There are a number of ways to rotate logs.
  -Using a script and cron (or systemd.timer)
  -Using ''logrotate''

====Logrotate using script====

edit the sudo crontab ''sudo crontab -e'':
<code>
Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat,sun
# |  |  |  |  |
# *  *  *  *  *   user-name command to be executed
# 0  0  1  *  * /home/shared/Myscripts/rotatelog.sh /var/log/UPS/UPSLog.Log #Rotate NUT UPS log file
</code>

where ''/home/shared/Myscripts/rotatelog.sh'' is:
<code>#!/bin/bash
logfile=$1
if [ ! -f $logfile ]; then
  echo "log file not found $logfile"
  exit 1
fi
timestamp=`date +%Y%m%d`
newlogfile=$logfile.$timestamp
cp $logfile $newlogfile
cat /dev/null > $logfile
gzip -f -9 $newlogfile
</code>
Remember to make executable (''sudo chmod +x /home/shared/Myscripts/rotatelog.sh'')

====logrotate====
  -Install logrotate
    - debian: ''sudo apt install logrotate''
    - Arch: ''sudo pacman -S logrotate''
  *The main logrotate configuration file is here: ''/etc/logrotate.conf''
  *

====Links====
[[https://www.linuxshelltips.com/rotate-logs-with-logrotate-linux/|How to Rotate Logs With Logrotate in Linux]]


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