Howto persist MongoDB - data of a running Docker container in a new image?

Question

i have a running Mongo DB Container called xyz from offical Mongo Image. i created the container with docker run -d -p 21707:21707 mongo In this container i create

Answer 1

I wanted to make an image to test things around authentication and I has the same issue. I solved it this way:

Dockerfile

FROM mongo

COPY setup.sh /
RUN chmod +x /setup.sh
RUN /setup.sh

ENTRYPOINT ["/usr/bin/mongod"]
CMD ["--auth", "--dbpath=/containerdb"]

setup.sh

#!/bin/bash

mkdir containerdb

mongod --auth --dbpath=/containerdb &

until mongo admin --eval 'db.createUser({"user":"root", "pwd":"password", "roles": [ "root" ] })'
do
  echo 'Mongo not yet ready, waiting 1 sec until retry'
  sleep 1
done

mongod --shutdown --dbpath=/containerdb

Bim! When you run this image you have a mongodb with authentication activated and a root user. The key is to workaround the VOLUME in the base Dockerfile by storing the data somewhere else.