Just a simple Mysql Replication Health Check script I wrote. You can put this in a cron.

MySQL Replication Check

#!/bin/bash

### VARIABLES ### \
SCRIPTWHERE="/jk/monitor"
EMAIL=""
TMP_STATUS="$SCRIPTWHERE/slave_status"

SERVER=$(hostname)
MYSQL_CHECK=$(mysql -e "SHOW VARIABLES LIKE '%version%';" || echo 1)
$(/usr/bin/mysql -e "SHOW SLAVE STATUS \G" > $TMP_STATUS)
$(date >> $TMP_STATUS)

LAST_ERRNO=$(grep "Last_Errno" $TMP_STATUS | awk '{ print $2 }')
#SECONDS_BEHIND_MASTER=$(grep "Seconds_Behind_Master" $TMP_STATUS | awk '{ print $2 }')
IO_IS_RUNNING=$(grep "Slave_IO_Running" $TMP_STATUS | awk '{ print $2 }')
SQL_IS_RUNNING=$(grep "Slave_SQL_Running" $TMP_STATUS | awk '{ print $2 }')
ERRORS=()

### Run Some Checks ###

## Check if I can connect to Mysql ##
if [ "$MYSQL_CHECK" == 1 ]
then
    ERRORS=("${ERRORS[@]}" "Can't connect to MySQL (Check Pass)")
fi

## Check For Last Error ##
if [ "$LAST_ERRNO" != 0 ]
then
    ERRORS=("${ERRORS[@]}" "Error when processing relay log (Last_Errno)")
fi

## Check if IO thread is running ##
if [ "$IO_IS_RUNNING" != "Yes" ]
then
    ERRORS=("${ERRORS[@]}" "I/O thread for reading the master's binary log is not running (Slave_IO_Running)")
fi

## Check for SQL thread ##
if [ "$SQL_IS_RUNNING" != "Yes" ]
then
    ERRORS=("${ERRORS[@]}" "SQL thread for executing events in the relay log is not running (Slave_SQL_Running)")
fi

## Check how slow the slave is ##
#if [ "$SECONDS_BEHIND_MASTER" == "NULL" ]
#then
#    ERRORS=("${ERRORS[@]}" "The Slave is reporting 'NULL' (Seconds_Behind_Master)")
#elif [ "$SECONDS_BEHIND_MASTER" > 60 ]
#then
#    ERRORS=("${ERRORS[@]}" "The Slave is at least 60 seconds behind the master (Seconds_Behind_Master)")
#fi

### Send and Email if there is an error ###
if [ "${#ERRORS[@]}" -gt 0 ]
then
    MESSAGE="An error has been detected on ${SERVER} involving the mysql replciation. Below is a list of the reported errors:\n\n
    $(for i in $(seq 1 ${#ERRORS[@]}) ; do echo "\t${ERRORS[$i]}\n" ; done)
    Please correct this ASAP
    "
#    echo -e $MESSAGE | mail -s "Mysql Replication for $SERVER is reporting Error" ${EMAIL}

# For Slack
echo "$MESSAGE" > $SCRIPTWHERE/local-slave-err.log
date >> $SCRIPTWHERE/local-slave-err.log

cat $SCRIPTWHERE/local-slave-err.log

SUBMSG="Mysql Replication for $SERVER is reporting Error"
bash $SCRIPTWHERE/slack.sh -c test-JK -u "$(hostname)" -i comet -C 1974D2 -p enable -T "$SUBMSG" -F "$SCRIPTWHERE/local-slave-err.log"

fi