cannot open connection of database in docker - mysql

Question

sql docker:
FROM ubuntu:latest
RUN apt-get update
RUN apt-get upgrade -y
RUN apt-get -y install mysql-client mysql-server curl
RUN sed -i -e"s/^bind-address\s*=\s*127.0.0.1/bind-address = 0.0.0.0/" /etc/mysql/my.cnf
ADD database.sql /var/db/database.sql
ENV user admin
ENV password admin
ENV url file:/var/db/database.sql
ENV right WRITE
ADD ./start-database.sh /usr/local/bin/start-database.sh
RUN chmod +x /usr/local/bin/start-database.sh
EXPOSE 3306
CMD ["/usr/local/bin/start-database.sh"]
--------\------
startdatabase.sh
#!/bin/bash
# This script starts the database server.
echo "Creating user $user for databases loaded from $url"
# Import database if provided via 'docker run --env url="http:/ex.org/db.sql"'
echo "Adding data into MySQL"
/usr/sbin/mysqld &
sleep 5
curl $url -o import.sql
# Fixing some phpmysqladmin export problems
sed -ri.bak 's/-- Database: (.*?)/CREATE DATABASE \1;\nUSE \1;/g' import.sql
# Fixing some mysqldump export problems (when run without --databases switch)
# This is not tested so far
# if grep -q "CREATE DATABASE" import.sql; then :; else sed -ri.bak 's/-- MySQL dump/CREATE DATABASE `database_1`;\nUSE `database_1`;\n-- MySQL dump/g' import.sql; fi
mysql --default-character-set=utf8 < import.sql
rm import.sql
mysqladmin shutdown
echo "finished"
# Now the provided user credentials are added
/usr/sbin/mysqld &
sleep 5
echo "Creating user"
echo "CREATE USER '$user' IDENTIFIED BY '$password'" | mysql --default-character-set=utf8
echo "REVOKE ALL PRIVILEGES ON *.* FROM '$user'#'%'; FLUSH PRIVILEGES" | mysql --default-character-set=utf8
echo "GRANT SELECT ON *.* TO '$user'#'%'; FLUSH PRIVILEGES" | mysql --default-character-set=utf8
#if [ "$right" = "WRITE" ]; then
#echo "adding write access"
echo "GRANT ALL PRIVILEGES ON *.* TO '$user'#'%' WITH GRANT OPTION; FLUSH PRIVILEGES" | mysql --default-character-set=utf8
echo "finished"
#fi
# And we restart the server to go operational
mysqladmin shutdown
echo "Starting MySQL Server"
/usr/sbin/mysqld
When I run this docker file of sql it runs.
But when I link it to application using the command
$ docker run --link mysqldb -d abc // here abc is image name of application
& mysqldb is name of sql db image.
it terminates the server and shows cannot open the connection.
Even though I had provided privileges to it and also provided the ip addr of sql image to application image.
I have seen that my sql server is running properly and it connect to mysql client also.
Please proivide a better solution**