user=root
port=3306
CmdPath=/opt/mysql/bin
password=xxxxxxxxxx

base_dir=/opt/mysql
inst_dir=/data/3306
alive="00"
sMysqld=0
sMysqldSafe=0
fSock=0
fPID=0

check_alive()
{
echo "running check_alive..."
if [ ps -ef | grep $port | grep -v grep | grep 'mysqld ' |awk '{print $2}' ];then
echo "Process mysqld is running!"
sMysqld=1
else
echo "Process mysqld is not running!"
sMysqld=0
fi

 if [`ps -ef | grep 3306 | grep -v grep | grep 'mysqld_safe' |awk '{print $2}'` ];then echo "Process mysqld_safe is running!"sMysqldSafe=1 else echo "Process mysqld_safe is not running!"sMysqldSafe=0 fi if [ -e${inst_dir}/mysql.sock ];thenecho "socked file exists!"fSock=1 else echo "socked file not exists!"fSock=0 fi if [ -e${inst_dir}/mysql.pid ];thenecho "pid file exists!"fPID=1 else echo "pid filenot exists!"fPID=0 fi if [ $sMysqld -eq 1 ];thenif [ $fPID -eq 0 ];thenecho "PID is missing, tring to recreate..."ps -ef | grep $port | grep -v grep | grep 'mysqld ' |awk '{print $2}' > ${inst_dir}/mysql.pidif [ -e ${inst_dir}/mysql.pid ]; thenecho "pid file is created!"elseecho "can not create PID file, please have a check!"fifiif [ $sMysqldSafe -eq 0 ];thenecho "Process mysqld_safe is missing, please have a check! May cause mysqld crash!"fiif [ $fSock -eq 1 ];thenecho "MySQL running fine!!!"alive="11"elseecho "socket file is missing, you may have to login without socket!"alive="10"fi elseecho "process mysqld is missing, mysql is stopped!"if [ $fSock -eq 1 ] | [ $fPID -eq 1 ];thenecho "mysql was stopped abnormality!"echo "cleaning socket file and pid file"alive="01"elsealive="00"fi fi

}

start_mysql()
{
check_alive
printf "MySQL is starting ... \n"
if [ $alive == "00" ]; then
${CmdPath}/mysqld_safe --defaults-file=${inst_dir}/my.cnf --user=${user} 2>&1 >/dev/null &
else
if [$alive == "11" ]; then
echo "MySQL is runnig!"
else
if [ $alive == "01" ]; then
echo "MySQL was stopped but pid or sock file still exits!"
echo "Cleanning pid or sock files!"
if [ $fSock -eq 1 ];then
rm -f ${inst_dir}/mysql.sock
fi
if [ $fPID -eq 1 ];then
rm -f ${inst_dir}/mysql.pid
fi
echo "Tring to start MySQL again!!!"
${CmdPath}/mysqld_safe --defaults-file=${inst_dir}/my.cnf --user=${user} 2>&1 >/dev/null &
fi
fi
fi
}

stop_mysql()
{
check_alive
printf "MySQL is Stopping...\n"
if [ $alive == "11" ]; then
${CmdPath}/mysqladmin -u root -p${password} -S ${inst_dir}/mysql.sock shutdown 2>&1 >/dev/null &
else
if [ $alive == "10" ]; then
${CmdPath}/mysqladmin -u root -p${password} -h $HOSTNAME -P $port --protocol tcp shutdown 2>&1 >/dev/null &
else
echo "MySQL is not running, no need stop!"
fi
fi
}

restart_mysql()
{
stop_mysql
sleep 5
if [ $? == 0 ];then
start_mysql
else
echo "stop mysql failed!"
fi
}

case $1 in

start)
start_mysql
;;
stop)
stop_mysql
;;
restart)
restart_mysql
;;
status)
status_mysql
;;
alive)
check_alive
;;
*)
printf "Please in put start|stop|restart|status as input"
;;
esac