docker link issue

lolwat.sh

#!/bin/bash

echo Creating MySQL data container
docker create --name foo-mysql-data -v /var/lib/mysql mysql:5.6

echo 'Creating MySQL server container'
docker run --name foo-mysql --volumes-from foo-mysql-data -e MYSQL_ROOT_PASSWORD=password -d mysql:5.6

echo 1st attempt to create database, will fail without sleep
#Error follows:
#Warning: Using a password on the command line interface can be insecure.
#mysqladmin: connect to server at 'mysql' failed
#error: 'Can't connect to MySQL server on 'mysql' (111)'
#Check that mysqld is running on mysql and that the port is 3306.
#You can check this by doing 'telnet mysql 3306'

docker run -it --rm --link foo-mysql:mysql mysql:5.6 /bin/bash -c 'mysqladmin --host=mysql --password=$MYSQL_ENV_MYSQL_ROOT_PASSWORD create wordpress'

echo 2nd attempt to create database, will pass with sleep
docker run -it --rm --link foo-mysql:mysql mysql:5.6 /bin/bash -c 'sleep 10 && mysqladmin --host=mysql --password=$MYSQL_ENV_MYSQL_ROOT_PASSWORD create wordpress'