Set Up MongoDB on Docker
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MongoDB is an open-source NoSQL database utilizing JSON-like documents and schemata that support rapid iterative development. Its scale-out architecture is popular with application developers who use agile methodologies to move quickly. As it’s popular within the agile community, using MongoDB with Docker is an excellent approach for a continuous integration and development (CI/CD) workflow.
Before You Begin
To complete the examples in this guide, first set up and secure a Linode with Docker installed. You can accomplish this by utilizing the Docker Marketplace App, or through manual installation. Instructions for both approaches are provided below.
This guide assumes you are comfortable with the command-line interface (CLI) on a Unix-like system and using it to work with programs.
Set up a Linode with Docker
Docker Marketplace App
You can quickly set up a secure, updated Linode with the Docker Marketplace App. For instructions, see our guide on How to Deploy Docker with Marketplace Apps. For the purposes of this guide, we recommend deploying the Docker Marketplace App with the Docker Options:
- The limited sudo user to be created for the Linode
- The password for the limited sudo user
- The limited sudo user SSH Public Key that will be used to access the Linode
- Disable root access over SSH? (yes)
Familiarize yourself with our Getting Started guide and complete the steps for updating your Linode.
Complete the sections of our Securing Your Server to create a standard user account, harden SSH access and remove unnecessary network services.
Install Docker on your Linode by following the steps in our guide on How to Install and Use Docker on Ubuntu and Debian.
Verify Docker Installation
Verify that Docker is installed on your Linode:
You can expect an output similar to the following:
Docker version 20.10.8, build 3967b7d
This guide is written for a non-root user. Commands that require elevated privileges are prefixed with
sudo. If you’re not familiar with the
sudo command, visit our Users and Groups guide.
All configuration files should be edited with elevated privileges. Remember to include
sudo before running your text editor.
How to Install a MongoDB Docker Container
Docker makes creating a MongoDB image very easy, as they keep an officially maintained version at the Docker Hub. To install it:
Download and install the MongoDB image from Docker Hub:
sudo docker pull mongo
The output as the image downloads should resemble the following:
Using default tag: latest latest: Pulling from library/mongo 16ec32c2132b: Pull complete 6335cf672677: Pull complete cbc70ccc8ebe: Pull complete 0d1a3c6bd417: Pull complete 960f3b9b27d3: Pull complete aff995a136b4: Pull complete 4249be7550a8: Pull complete cc105ff5aa3c: Pull complete 82819807d07a: Pull complete 81447d2c233f: Pull complete Digest: sha256:54d24682d00278f64bf21ff62b7ee62b59dae50f65139831a884b345922b0f8a Status: Downloaded newer image for mongo:latest docker.io/library/mongo:latest
NoteThis command pulls the latest version by default (as it says in the first line of the output). To pull a specific version, add the tag for that version to the command. For example, to install MongoDB 4.4.6, enter
docker pull mongo:4.4.6.
Ensure the image has been installed:
sudo docker images
The output should look like this:
REPOSITORY TAG IMAGE ID CREATED SIZE mongo latest 07630e791de3 2 weeks ago 449MB
Create a container with the
mongoimage in detached mode so that it is still interactive on your system:
sudo docker run --name mongo_example -d mongo
Ensure the container is running:
sudo docker ps
The output should look like this:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 1f88d00b9e78 mongo "docker-entrypoint.s…" 4 seconds ago Up 4 seconds 27017/tcp mongo_example
MongoDB is now running as a Docker Container.
How to Log Into MongoDB on the Container
Enter the following to gain the bash prompt within the container:
sudo docker exec -it mongo_example bash
Once at the container’s command prompt, enter the
mongosh shell, you can test queries and operations directly with your database.
mongoshell has been deprecated in MongoDB v5.0, but is still accessible as an alternative to
How to Configure MongoDB in a Docker Container
For details on configuring MongoDB, see the MongoDB manual. However,
mongod (MongoDB’s primary daemon) flags are usually set to configure MongoDB, and the
docker run command is designed to pass the
For example, to turn off the scripting engine, add the flag to the end of the command like the following:
sudo docker run --name mongo_example2 -d mongo --noscripting
As another example, to turn off the scripting engine and turn on IPv6, enter the following:
sudo docker run --name mongo_example3 -d mongo --noscripting --ipv6
How to Save MongoDB data from a Docker Container
Since MongoDB is being run on a Docker Container, its data won’t persist when it’s exited (as it saves the data in the /data/db directory in the container itself). If you need the MongoDB data to persist, you must create and mount a Docker Volume or mount a directory from your host system.
Adding a Docker Volume to a MongoDB Container
Creating and adding a volume for the container to use is straightforward if you are familiar with Docker.
Create a Docker Volume for the data to reside on by entering the following:
sudo docker volume create mongo_volume
Then create a
docker runcommand to attach the volume to the container and map it to the
/data/dbcontainer directory by entering:
sudo docker run -it -v mongo_volume:/data/db --name mongo_example4 -d mongo
Mounting a Host System Directory in a MongoDB Docker Container
If you want data to persist and access the data outside of Docker, you can use a directory on your host system.
To mount a host system directory:
Create a directory on your system (if you don’t have one you want to use) at the root level of your system by entering:
sudo mkdir -p /mongo_data_directory
Then execute a
docker runcommand to mount the directory and map it to
sudo docker run -it -v /mongo_data_directory:/data/db --name mongo_example5 -d mongo
Learning how to use MongoDB on Docker is vital for CI/CD workflows and rapid iterative development. Continuing with some of Docker’s MongoDB information at the Docker Hub is an excellent companion to this article.
To learn more about
mongod options to be passed in
docker run, review the
mongod MongoDB Package Components section of the MongoDB Manual.
Also, if you plan on upgrading to MongoDB Enterprise, see Install MongoDB Enterprise with Docker in the MongoDB Manual for instructions
You may wish to consult the following resources for additional information on this topic. While these are provided in the hope that they will be useful, please note that we cannot vouch for the accuracy or timeliness of externally hosted materials.
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