A dockerized mongod instance with authentication enabled


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Here’s just a quick walkthrough showing how to create a dockerized instance of a standalone MongoDB instance.

First, from within a terminal, create a folder to hold the Dockerfile…

mkdir Docker_MongoDB_Image
cd Docker_MongoDB_Image
touch Dockerfile

Edit the Dockerfile…

vi Dockerfile

Enter the following text. You may wish to modify the file slightly. For example; if you need to set any of the proxy values or the MongoDB admin password.

FROM centos
#ENV http_proxy XXXXXXXXXXXXXXXXXX
#ENV https_proxy XXXXXXXXXXXXXXX

MAINTAINER Rhys Campbell no_mail@no_mail.cc

RUN echo $'[mongodb-org-3.4] \n\
name=MongoDB Repository \n\
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.4/x86_64/ \n\
gpgcheck=1 \n\
enabled=1 \n\
gpgkey=https://www.mongodb.org/static/pgp/server-3.4.asc ' > /etc/yum.repos.d/mongodb-org-3.4.repo

RUN yum clean all && yum install -y mongodb-org-server mongodb-org-shell mongodb-org-tools
RUN mkdir -p /data/db && chown -R mongod:mongod /data/db
RUN /usr/bin/mongod -f /etc/mongod.conf && sleep 5 && mongo admin --eval "db.createUser({user:\"admin\",pwd:\"secret\",roles:[{role:\"root\",db:\"admin\"}]}); db.shutdownServer()"
RUN echo $'security: \n\
  authorization: enabled \n ' >> /etc/mongod.conf
RUN sed -i 's/^  bindIp: 127\.0\.0\.1/  bindIp: \[127\.0\.0\.1,0\.0\.0\.0\]/' /etc/mongod.conf
RUN sed -i 's/^  fork: true/  fork: false/' /etc/mongod.conf
RUN chown mongod:mongod /etc/mongod.conf
RUN cat /etc/mongod.conf

EXPOSE 27017

ENTRYPOINT /usr/bin/mongod -f /etc/mongod.conf

Build the image from within the current dirfectory…

docker build -t mongod-instance . --no-cache

Run the image and map to the 27017 port…

docker run  -p 27017:27017 --name mongod-instance -t mongod-instance

Inspect the mapped port with…

docker ps

The output should look something like this…

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                      NAMES
5e7e4a069f4a        mongod-instance     "/bin/sh -c '/usr/..."   2 hours ago         Up 2 hours          0.0.0.0:27017->27017/tcp   mongod-instance

We can view the docker ip address with this command…

docker-machine ls

Output looks like this…

NAME      ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER        ERRORS
default   *        virtualbox   Running   tcp://192.168.99.100:2376           v17.05.0-ce

You can connect to the dockerized mongod instance with this command…

mongo admin -u admin -p --port 27017 --host 192.168.99.100

When you are done with the instance it can be destroyed with…

docker stop mongod-instance
docker rm mongod-instance

Update: I’ve added this to my Docker Hub account so you can grab the image directly from there.

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