CODEWITHSUNDEEP
mongodbdocker
craigb85
craigb85

Reputation: 11

How to create a new Mongodb in a Docker container upon startup?

Really simple Dockerfile: 

FROM mongo:3.2.10

#create DB directory
RUN mkdir -p /data/db

EXPOSE 27017

CMD ["mongod"]

When I run the container I want to automatically create a DB called "CBDB". I do not want to manually run the mongo shell, want the new DB to be created automatically.

Thanks!

Upvotes: 1

Views: 2144

Answers (1)

Toni Piza
Toni Piza

Reputation: 515

You can execute mongo as a daemon and write an script to be executed in an entrypoint.

https://docs.mongodb.com/manual/tutorial/write-scripts-for-the-mongo-shell/

As a simple example, use this Dockerfile and entrypoint:

FROM mongo:3.2.10

#create DB directory
RUN mkdir -p /data/db

EXPOSE 27017

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

ENTRYPOINT ["./entrypoint.sh"]

In the entrypoint, you can use the mongo as a daemon, and execute a one liner to create a database and a collection. Remember to use tail (or something like supervisord) to assure that the container does not gets stopped:

#!/bin/bash
mongod --fork --logpath /var/log/mongo.log
mongo --eval "db = db.getSiblingDB('new_db'); db.createCollection('new_collection');"
tail -f /var/log/mongo.log

Upvotes: 2

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