Segmentation Fault: Core dumped..;-)

My cron framework..;-) How do you do it?

Posted : May 4, 2004 at 10:41 am [America/Los_Angeles]

Ok, so here’s Anand’s Law :

For every transactional web application out there in businesses, there are atleast twice as many scheduled (cron) jobs propping it up.

Here are some details of how I tend to handle my cron needs:

Folder (adjust it to your liking):
-------------------------------------
/usr/local/allcrons

Sub-folders (feel free to add/subtract):
-----------------------------------------------
bin/ etc/ log/ var/

Main cron script (allcrons/bin/run.sh):
----------------------------------------------
#!/bin/sh

# Top level folder
CRON_TOP=/usr/local/allcrons
export CRON_TOP

#### Log folder
CRON_LOG=${CRON_TOP}/var/log
export CRON_LOG

### Capturing the date/time
CRON_EXEC_TIME=`date +%d-%m-%y_%H.%M.%S`
export CRON_EXEC_TIME

### Email Address
EMAIL_ADDRESS=<your-email-address>
export EMAIL_ADDRESS

#### Environment variables
export PATH=$PATH:/usr/local/mysql/bin
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/lib:/usr/lib

########################################################################
# Display the end of execution
########################################################################
function displayfinalbanner () {
        echo
        echo "Execution completed !!!"
        echo
}

########################################################################
# Function to display usage information and exit
########################################################################
function displayusagebanner () {
        echo "usage: ${0} <param>"
        cat <<EOF
        where <param> equals one of the following:

        mysqlbk: Execute MySQL backup
EOF
}

########################################################################
# Getting ready to start execution...
########################################################################
function init() {
        echo "Setting the current dir to ${CRON_TOP} ..."
        echo
        cd ${CRON_TOP}
        PRESENT_DIR=`pwd`
        echo "Changed current dir to ${PRESENT_DIR} ..."
        echo
}

########################################################################
# Execute MySQL Backup
########################################################################
function mysqlbk() {
        echo "Starting mysqldump..." >> ${CRON_TOP}/var/cron-output.txt
        mysqldump --add-drop-table --extended-insert --lock-tables -u <your-blogdb-id> 
              --password="<your-blogdb-password>" <your-blogdb> > ${CRON_TOP}/db/mt.dmp

        echo "Compressing the dump using bzip2..." >> ${CRON_TOP}/var/cron-output.txt
        bzip2 -f ${CRON_TOP}/db/mt.dmp
}       

########################################################################
# Function to start email before a run
########################################################################
function startmail () {
        echo "Starting cron run..." > ${CRON_TOP}/var/cron-output.txt
        echo "-----------------------------" >> ${CRON_TOP}/var/cron-output.txt
        echo "" >> ${CRON_TOP}/var/cron-output.txt
}

########################################################################
# Function to send email after a run
########################################################################
function sendmail () {
        echo ""  >> ${CRON_TOP}/var/cron-output.txt
        echo "Signed"  >> ${CRON_TOP}/var/cron-output.txt
        echo "The Ghost who walks, talks and emails...."  >> ${CRON_TOP}/var/cron-output.txt
        # Send email
        /usr/lib/sendmail ${EMAIL_ADDRESS} < ${CRON_TOP}/var/cron-output.txt
}

#### Check for proper usage (mainly number of arguments passed)
ERROR=1
ARGS=$#
if [ $ARGS -lt 1 ]
then
  displayusagebanner
  exit 1
fi

case ${1} in
mysqlbk|MYSQLBK)
        init
        startmail
        mysqlbk
        sendmail
        ;;
        *)
        displayusagebanner
        exit 1
    ;;
esac

echo
displayfinalbanner

# End

Cron entries (allcrons/etc/cron.txt):
0 1 * * * /usr/local/allcrons/bin/run.sh mysqlbk > /tmp/cron-mysqlbk.log 2>&1

How to add it to your crontab:
(unix-prompt)>crontab cron.txt

So, if I want to add a new cron, all I do is:

1. Update my ‘displayusagebanner’ banner method, add a new method (’doblah’) and then create a new ‘case’ entry to call the new method.

   - Anand

   Category: Services and Software

   Viewed: 841 times