Start MySQL with dynamic IP address in Ubuntu

 put these code in /etc/init.d/mysql

#pick up the new IP address
IP=`ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'`

# replacement in my.cnf
 OLD=`cat /etc/mysql/my.cnf  | grep 'bind-address'| awk '{ print $3}'`

 sed -i "s/$OLD/$IP/g" /etc/mysql/my.cnf