How to Create a Docker Image From a Container

I wanted to bake in a Database into the MySQL docker image on hub.docker.com.

1. Dockerfile

FROM mysql:5.7

# Add a database
ENV MYSQL_DATABASE my_database

COPY ./sql/ /docker-entrypoint-initdb.d/

RUN docker-entrypoint.sh

CMD ["mysqld"]

2. Build. the container

> docker build --force-rm -t my_docker_account/mysql:5.7-baked-in-db ./Dockerfile

3. Run the container
We need to run the container so the MySQL image will import the SQL files and the database. Note “–name my_mysql“, we’re giving our container a nickname here which we will refer to later on.

> docker run --rm -d -p 3306:3306 --name my_mysql -e MYSQL_ROOT_PASSWORD=secret my_docker_account/mysql:5.7-baked-in-db 

4. Log into the box (optional)
You can log into the box to have a look around if you like

> docker exec -it my_mysql /bin/bash

5. Use the container ID and push to the image namespace

> docker commit my_mysql my_docker_account/mysql:5.7-baked-in-db 
> docker push my_docker_account/mysql:5.7-baked-in-db 

Now you have a pushed pre-built MySQL container as an image.

 

Gareth

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