How to Run MongoDB as a Docker Container ?
MongoDB is an open-source document-oriented database designed to store a large scale of data and allows you to work with that data very efficiently. It is categorized under the NoSQL (Not only SQL) database because the storage and retrieval of data in MongoDB are not in the form of tables.
In this guide, we’ll learn how to run MongoDB as a docker Container. Let’s first quickly understand what exactly is a docker container.
What Is a Docker Container ?
Containerization is OS-based virtualization that creates multiple virtual units in the userspace, known as Containers. Containers share the same host kernel but are isolated from each other through private namespaces and resource control mechanisms at the OS level.
Container-based Virtualization provides a different level of abstraction in terms of virtualization and isolation when compared with hypervisors. Hypervisors use a lot of hardware which results in overhead in terms of virtualizing hardware and virtual device drivers. A full operating system (e.g -Linux, Windows) runs on top of this virtualized hardware in each virtual machine instance. To Know more about Docker Containers refer to the Containerization using Docker.
To deploy your application in the form of containers you need to build a docker image by which you can run as a container to build an image you need to write the Dockerfile.
Can MongoDB Run in a Docker Container ?
Yes, you can run MongoDB as a Docker container. In DockerHub there are two types of MongoDB images community edition and enterprise edition you can any of them according to the organization’s need to run as a Docker Container or you can build your own Docker Image by writing the Dockerfile according to your own requirements. To know about Dockerfile syntax refer to the What is Dockerfile Syntax ?
How to Set up MongoDB on Docker
To use MongoDB with Docker, follow these easy steps:
Step 1: Pull the MongoDB container.
docker pull mongo:latest
Step 2: Run the container.
docker run -d -p 27017:27017 --name=mongo-example mongo:latest
Where the -d flag runs the container in detach (background) mode, -p 27017:27017 bound the container’s port 27017 to 27017 of the host, and –name=mongo-example will give a name to your container instead of an arbitrary name.
Step 3: Verify the state.
docker ps
As you can see the container is running successfully.
Step 4: Access the MongoDB shell in the running container
docker exec -it mongo-example mongo
As you can see we can access the interactive shell.
What Are The Benefits of Using Docker ?
-
Platform Independent: Docker containers are platform independent means the Docker image can build in one environment and it can be run in the other environment. It will be consistent across all the environments you are going to run the image as a container.
-
Light Weight: Docker Containers are light in weight when compared to the Virtualization deployment so they can easy to maintain occupies less space.
-
Easy Scaling: In virtualization deployment, if you want to scale then you need to entire virtual machine but in Docker containers you just need to scale the containers that can be automated depending on the incoming traffic.
-
Load Balancing: The load balancing can be done across two containers depending on the load the application is receiving and also you can divert the traffic to the multiple containers y depending on the amount of traffic it is receiving.
-
Resource Isolation: You can allocate a specific amount of resources like CPU, Memory, and storage to the applications which will ensure that they will not reach the allocated limit.
Docker And MongoDB Atlas
MongoDB Atlas
MongoDB Atlas is a database service (DBaaS) platform that is managed and taken completely by MongoDB. Where you need to focus merely on your data extraction and data intrusion rest will be taken care of by the MongoDB itself like scaling and load balancing and the underlying infrastructure. To connect to this database the preferred way using the application which is containerized.
The applications which are deployed using the Docker in the form of containers will be very stable across all the environments so it is very preferable with the help of database string you can extract the data from the MongoDB database.