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:title: Building a Docker Image with MongoDB
:description: How to build a Docker image with MongoDB pre-installed
:keywords: docker, example, package installation, networking, mongodb
.. _mongodb_image:
Building an Image with MongoDB
==============================
.. include:: example_header.inc
The goal of this example is to show how you can build your own
Docker images with MongoDB pre-installed. We will do that by
constructing a ``Dockerfile`` that downloads a base image, adds an
apt source and installs the database software on Ubuntu.
Creating a ``Dockerfile``
+++++++++++++++++++++++++
Create an empty file called ``Dockerfile``:
.. code-block:: bash
touch Dockerfile
Next, define the parent image you want to use to build your own image on top of.
Here, we’ll use `Ubuntu <https://index.docker.io/_/ubuntu/>`_ (tag: ``latest``)
available on the `docker index <http://index.docker.io>`_:
.. code-block:: bash
FROM ubuntu:latest
Since we want to be running the latest version of MongoDB we'll need to add the
10gen repo to our apt sources list.
.. code-block:: bash
# Add 10gen official apt source to the sources list
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
Then, we don't want Ubuntu to complain about init not being available so we'll
divert ``/sbin/initctl`` to ``/bin/true`` so it thinks everything is working.
.. code-block:: bash
# Hack for initctl not being available in Ubuntu
RUN dpkg-divert --local --rename --add /sbin/initctl
RUN ln -s /bin/true /sbin/initctl
Afterwards we'll be able to update our apt repositories and install MongoDB
.. code-block:: bash
# Install MongoDB
RUN apt-get update
RUN apt-get install mongodb-10gen
To run MongoDB we'll have to create the default data directory (because we want it to
run without needing to provide a special configuration file)
.. code-block:: bash
# Create the MongoDB data directory
RUN mkdir -p /data/db
Finally, we'll expose the standard port that MongoDB runs on, 27107, as well as
define an ``ENTRYPOINT`` instruction for the container.
.. code-block:: bash
EXPOSE 27017
ENTRYPOINT ["usr/bin/mongod"]
Now, lets build the image which will go through the ``Dockerfile`` we made and
run all of the commands.
.. code-block:: bash
sudo docker build -t <yourname>/mongodb .
Now you should be able to run ``mongod`` as a daemon and be able to connect on
the local port!
.. code-block:: bash
# Regular style
MONGO_ID=$(sudo docker run -d <yourname>/mongodb)
# Lean and mean
MONGO_ID=$(sudo docker run -d <yourname>/mongodb --noprealloc --smallfiles)
# Check the logs out
sudo docker logs $MONGO_ID
# Connect and play around
mongo --port <port you get from `docker ps`>
Sweet!
|
