Removing old Naemon logfiles

In an OMD environment Naemon writes its logfile to var/naemon/naemon.log. At midnight a logrotate job moves the logfile to the folder var/naemon/archive, renaming naemon.log to naemon.log-YYYMMDD. By default none of the archived logs is ever deleted. If your disk space is limited, you may want to discard old logs after some months or years.

Create a file ~/local/bin/purge_naemon_archive with the following content.

#!/bin/bash

archive_dir=$OMD_ROOT/var/naemon/archive

today=$(date +%Y%m%d)
days_to_keep=${CONFIG_NAEMON_ARCHIVES_RETENTION:-365}
# the oldest day in yyyymmdd format
cutoff_date=$(date -d "$today - $days_to_keep days" +%Y%m%d)

for file in "$archive_dir"/naemon.log-*
do
    # extract the date from the filename
    file_date=$(basename "$file" | cut -d '-' -f 2)

    # if the file's date is older than the cutoff date, delete it
    # (yyyymmdd format allows integer operations)
    if [[ "$file_date" -lt "$cutoff_date" ]]
    then
        rm "$file"
    fi
done

Make it executable with:

chmod 755 ~/local/bin/purge_naemon_archive

Then create a cronjob by writing this line into the file ~/etc/cron.d/purge_naemon_archive:

10 0 * * * $OMD_ROOT/local/bin/purge_naemon_archive

Finally, restart the cron daemon:

omd restart crontab

Now archived logfiles will be deleted if they are older than a year. You can define your own retention period by setting the environment variable CONFIG_NAEMON_ARCHIVES_RETENTION to the number of days you want to keep the log files. (You can add the variable to ~/etc/environment)

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