Скрипт восстановления MySQL репликации

#!/bin/bash
## Tool to unstick MySQL Replicators.
## Set to run from cron once a minute.
 
# */1 * * * * /usr/local/bin/whip_slave_mysql > /dev/null 2>&1
 
# Last updated: MM/DD/YYYY
 
COMMANDS="mysql grep awk logger"
 
export PATH='/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin'
 
for i in $COMMANDS
do
        X=`echo $i | tr '[a-z]' '[A-Z]'`
        export $X=`type -p $i`
done
 
# Define variables
USERNAME=root
PASSWORD=xxxxxxxx
 
# Define Functions
## Obtain MwSQL slave server status
function SLAVE()
{
        STATUS=`$MYSQL -u $USERNAME -p$PASSWORD -e \
                "SHOW SLAVE STATUS \G" |
                $GREP Seconds_Behind_Master |
                $AWK '{print $2}'`
}
 
## Skip errors
function UNSTICK()
{
        $MYSQL -u $USERNAME -p$PASSWORD -e \
                "STOP SLAVE; SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1; START SLAVE;"
        sleep 5
        # Check everything again
        CHECK
}
 
## Decide what to do...
function CHECK()
{
        # Obtain status
        SLAVE
        if [ $STATUS = NULL ]
        then
                # I think the replicator is broken
                echo "MySQL Slave database is not replicating. Fixing..." | $LOGGER
                UNSTICK
        else
                # Everything should be fine
                echo "MySQL Slave is $STATUS seconds behind its Master." | $LOGGER
        fi
}
 
## Are we running?
function ALIVE()
{
        UP=`$MYSQL -u $USERNAME -p$PASSWORD -e \
                "SHOW SLAVE STATUS \G" |
                $GREP Slave_IO_Running |
                $AWK '{print $2}'`
 
        if [ $UP = Yes ]
        then
                # Let's check if everything is good, then...
                CHECK
        else
                # Uh oh...let's not do anything.
                echo "MySQL Slave IO is not running!" | $LOGGER
                exit 1
        fi
}
 
# How is everything?
ALIVE
 
#EoF
exit 0