In our previous post we went through the steps to Setup a Docker Container With MongoDB manually.

Docker has a simple DSL that lets you automate all of these steps to make a conainer.

Docker file syntax

Every line in a docker file has the following structure: INSTRUCTION arguments

Comments are ignored, and the first line in the docker file should contain the command FROM <image

Commands available full details

• FROM (select the base image)
• MAINTAINER (Set the author field for images)
• RUN (run a command, and commit)
• CMD (the default execution command for the container)
• EXPOSE (set the port to be publicly exposed)
• ENV (set environment variables)
• ADD (add files from source and copy them to the container)
• ENTRYPOINT (configure the container to run as an executable)
• VOLUME (add a volume)
• USER (set the user)
• WORKDIR (set working directory)

MongoDB dockerfile

We create a dockerfile, and just use all the same commands we used previously touch Dockerfile

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FROM ubuntu:latest
RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
RUN echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | tee /etc/apt/sources.list.d/10gen.list
RUN dpkg-divert --local --rename --add /sbin/initctl
RUN ln -s /bin/true /sbin/initctl
RUN apt-get update
RUN apt-get install mongodb-10gen
RUN mkdir -p /data/db
EXPOSE 27017
CMD ["usr/bin/mongod", "--smallfiles"]

Then we issue:

sudo docker build -t codiez/mongodb .

and start it up with…

sudo docker run -d codiez/mongodb

In the next post, we will discuss creating a SAAS database service using docker and mongodb.