Public-Helperscripts/distributed_cron.sh

#!/usr/bin/env bash

# Author: H2 invent GmbH <support@h2-invent.com>
# License: AGPLv3
# Usage: Use the helper script in cronjobs in hosts or containers.
# The cron_lock can be shared so the job will only be executed one.

TIME=$(shuf -i 0-900 -n1)
sleep 0.$TIME
echo "Sleep for 0.$TIME"

echo "Checking cron_lock file"
FILE=$1

if [ ! -f $FILE ]
then
    echo $(hostname) > $FILE
    echo "$(date) -- START CRON_LOCK -- $(hostname)" >> $FILE.log

    $2

    if [ $? -ne 0 ]
    then
        echo "FAILED -- $(date) -- $(hostname)" >> $FILE.log
    else
        echo "OK -- $(date) -- $(hostname)" >> $FILE.log
    fi

else
    echo "Other Server is running cron job"
fi

sleep 10.$TIME

if [ -f $FILE ]
then
    echo "$(date) -- REMOVE CRON_LOCK -- $(hostname)" >> $FILE.log
    rm $FILE
fi