[Docker] Integrate a MySQL Docker Container Into an Application

Starting up our server and running the curl command curl localhost:3000/health, we find that we get an error. Our server is complaining about us not having a database. Since this is a fresh install, we have no data at all. SQL comes with a file called init.sql inside of your db folder that will create a database, add the necessary tables for our application, and prepopulate the table with a single entry. We just have to put it in the folder that MySQL will use to populate the database!

In this case, any .sql file in the /docker-entrypoint-initdb.d folder will be executed against our MySQL server as soon as the container is started. If there were any .sh file in there, they would also be automatically executed.

in db/init.sql:

create database if not exists images;
grant select, insert, update, delete on images.* to 'user'@'%';
use images;
create table images( id INT AUTO_INCREMENT PRIMARY KEY, caption VARCHAR(100), filename VARCHAR(255) );
insert into images(caption, filename) values("Hello", "hello-caption.gif");

Locate db folder.

Then run:

docker run -p 3306:3306 -d --name k8scourse-db -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root --rm -v $(pwd)/init.sql:/docker-entrypoint-initdb.d/init.sql mysql:5.7 

We added -v $(pwd)/init.sql:/docker-entrypoint-initdb.d/init.sql

A volume file which located in db/init.sql, copy file to /docker-entrypoint-initdb.d/init.sq.

Then mysql will automatically init table according to init.sql file