Abayomi Ogunnusi

Posted on May 10, 2022

Docker: NodeJs and MongoDb Services

#docker #devops #javascript #node

Hello there, This post is a continuation of my docker article. To check click the links.
Docker in and out
Dockerize NodeJs app

To follow along, you must have docker and node installed.

Today, we will learn how we can deploy two services NodeJs app with MongoDb.

Find the source code here

Agenda

🎯 Node Project Setup
🎯 Docker setup
🎯 Folder structure
🎯 Code breakdown

Initiate the project

npm init -y

Install the dependencies

npm i express dotenv mongoose

package.json

Docker Setup

To pull node and mongo image, go to docker hub and get the official images. click
Make sure your docker deamon is on. Click on the docker desktop to activate the deamon.

To check if your docker is installed on your machine, run docker --version in your terminal

Pull node image

Pull the mongo image

Check the docker images

docker image ls

Folder structure

Here's our folder structure in its most basic architecture.

Code breakdown

🐋 Database setup

In this config folder, we imported the mongoose module, connected to our database and exported the configuration.

⚠️ Note:

The docker-node-mongo can be named anything
Notice the mongo:27017/docker-node-mongo, this replaces the localhost we use in our development mode.

🐋 Model and Schema

Here we import the mongoose library and create a new schema for the user.

🐋 Routes

We write the business logic and export the express router and thereafter mount it in the main entry file app.js

🐋 .env

🐋 app.js



const express = require('express');
const dotenv = require('dotenv');
dotenv.config();
const connectDb = require('./config/db');

const app = express();

connectDb();
const port = process.env.NODE_LOCAL_PORT || 3020;

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.get('/', (req, res) => {
  res.send('Hello World');
});

app.use('/', require('./routes/user'));

app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});

Now, let's test our app locally by running the following command:
npm start

Next, let's stop the server by running Ctrl + C.

Docker file

The first line is the base image that we want to use.

The WORKDIR command is used to set the working directory for the container.

We copy the package.json file to the current directory.
We install our dependencies.

The COPY command copies the contents of the current directory to the Dockerfile's context.

The EXPOSE command is used to expose ports to the outside world.

The CMD directive is used to specify the command that will be run when the image is run.

⚠️ We could actually go ahead to build this image using this Dockerfile by running the build command like docker build -t [name of container] and then run using docker run -p 8082:8082 [image name] ... but it will not connect to the mongodb service. In other to be able to run the two services we need a docker-compose.yml file

Docker compose file

Lastly, we setup our docker-compose.yml for the app and mongo service. This file helps us to build and link our NodeJs app to the mongo image.

Testing

To test we run this command:
docker-compose up -d

The -d flag means we are running the container in a detached mode.

To check running containers

We see the two containers up and running.

Let's go over to our browser

Testing the POST route.

Lets check our created user using the docker exec command.
Check the running container

Enter into the mongo container

Conclusion

I hope this post was helpful. Check the above link for the source code if you get stuck while following along.

Reference

Traversy Media, Docker with Mongo

Top comments (20)

Chandrashekhar Mehta • Nov 29 '23

Thank you very much! for creating this
It's very helpful to me while doing a course on Coursera. You have created such an easy way to perform the steps.

Muhammad Zahak • Dec 15 '23

is your code run ?

Chandrashekhar Mehta • Dec 16 '23

yes

Muhammad Zahak • Dec 16 '23

How kindly explain so that I can sort out, it is not running when I run command 'npm start'

Chandrashekhar Mehta • Dec 16 '23

send your discord user name, I will connect with you and explain or if you can explain your problem here in detail

Comment deleted

Chandrashekhar Mehta • Dec 17 '23

your github repo has nothing to solve

Muhammad Zahak • Dec 15 '23

I couldn't done this. is the documentation correct or something missing or not guided according to the beginner level ?

Chandrashekhar Mehta • Dec 17 '23

Everything is correct; just follow the steps. Did you install Node and Docker?

Muhammad Zahak • Dec 21 '23

yes, but when I run localhost to check docker container it is not respond and when I run command 'npm start' the other port for node is running.

Chandrashekhar Mehta • Dec 23 '23

Yes, actually, there is a problem with the Mongoose file db.js

`const mongoose = require('mongoose');
const mongoURI = "mongodb://localhost:27017"

const connectDb = async () => {
try {
mongoose.set('strictQuery', false)
mongoose.connect(mongoURI)
console.log('Mongo connected')
}
catch(error) {
console.log(error)
process.exit()
}
}
module.exports = connectDb;
`

try this code instead.
hope this will help to resolve.

Muhammad Zahak • Dec 25 '23

C:\Users\zahak\OneDrive\Desktop\webApp\node_modules\express\lib\router\index.js:469
throw new TypeError('Router.use() requires a middleware function but got a ' + gettype(fn))
^

TypeError: Router.use() requires a middleware function but got a Object
at Function.use (C:\Users\zahak\OneDrive\Desktop\webApp\node_modules\express\lib\router\index.js:469:13)
at Function. (C:\Users\zahak\OneDrive\Desktop\webApp\node_modules\express\lib\application.js:227:21)
at Array.forEach ()
at Function.use (C:\Users\zahak\OneDrive\Desktop\webApp\node_modules\express\lib\application.js:224:7)
at Object. (C:\Users\zahak\OneDrive\Desktop\webApp\app.js:18:5)
at Module._compile (node:internal/modules/cjs/loader:1256:14)
at Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
at Module.load (node:internal/modules/cjs/loader:1119:32)
at Module._load (node:internal/modules/cjs/loader:960:12)
at Function.executeUserEntryPoint as runMain

Now this error I'm facing

Chandrashekhar Mehta • Dec 25 '23

send your app.js and user.js file to me, there's probably problem with your routes

Muhammad Zahak • Dec 25 '23

how ? where ?

Chandrashekhar Mehta • Dec 26 '23

can you push it on your github ?

Muhammad Zahak • Dec 26 '23

doing

Muhammad Zahak • Dec 31 '23

pushed Code, have you seen yet ?

Chandrashekhar Mehta • Jan 18

Sorry, bro, I was busy for a few days. couldn't see it; I even didn't get this notification. Will see and let you know asap.

Muhammad Zahak • Dec 22 '23