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Version: 1.8

Connect Expressjs With Mongodb Database

Introduction​

In this application, you will learn about how to create a Expressjs Application that connects to mongoDb.

Follow the below-mentioned steps, to deploy the application on Devtron using mongoDb Helm Chart.

1. Deploy mongoDb Helm Chart​

To deploy mongoDb Helm Chart, you can refer to our documentation on Deploy mongoDb Helm Chart.

2. Fork the Git Repository​

For this example, we are using the following GitHub Repo, you can clone this repository and make following changes in the files.

Dockerfile​

This is the Dockerfile. This exposes our expressjs application to port number 8080

FROM node:7
WORKDIR /app
COPY package.json /app
RUN npm install
COPY . /app
CMD node server.js
EXPOSE 8080

db.js File​

This file will be used to connect to our database. This will include the service-name of the mongoDb Helm Chart, that you have deployed in Step1.

The syntax is as follows:

<service-name>:27017/<database-name>

This maps our service name to mongoDb's port number 27017.

module.exports = {
    DB: 'mondo-dev-mongodb-replicaset-client:27017/sale'
}

3. Create Application on Devtron​

To learn how to create an application on Devtron, refer to our documentation on Creating Application

Git Repository​

In this example, we are using the url of the forked Git Repository.

Docker configuration​

Give, the path of the Dockerfile.

Configure Deployment Template​

Enable Ingress, and give the path on which you want to host the application.

Set up the CI/CD Pipelines​

Set up the CI/CD pipelines. You can set them to trigger automatically or manually.

Trigger Pipelines​

Trigger the CI Pipeline, build should be Successful, then trigger the CD Pipeline, deployment pipeline will be initiated, after some time the status should be Healthy

4. Final Step​

Check the Expressjs app connected to mongodb database, running successfully by hitting your application url.

The syntax is: http://<hostname>/<path>/

path will be the one that you have given in Step 3 while configuring the Deployment Template.

The output of our application would be as follows:

You can see that we are getting the JSON response. We have successfully connected our expressjs application to the mongoDb database.