🚀 docker-testapp

A simple Node.js + MongoDB full stack demo app containerized using Docker, with Mongo Express for database UI management.

👨‍💻 Made by Tanvir Anjom Siddique
📺 Learned from YouTube: Apna College Official

View as website

🐳 Docker Command Reference

Sl. Command Description Reason
1 docker compose -f mongodb.yaml up Builds (if needed) and starts containers First-time setup to pull images and run MongoDB & Mongo Express
2 docker compose -f mongodb.yaml down Stops and removes containers, networks, volumes Clean teardown to remove all Docker resources
3 docker compose -f mongodb.yaml start Starts existing, already created containers Reuse previously created containers without rebuilding
4 docker compose -f mongodb.yaml stop Gracefully stops containers without removing them Use this to stop the environment temporarily
5 docker ps Lists active containers Ensures that services are running
6 docker images Lists available images Check if images were successfully pulled
7 docker network ls Shows available Docker networks Ensure Mongo and Express are on the same network
8 docker logs <container_name> View runtime logs of a container Debug startup or runtime errors
9 docker exec -it <container_name> bash Access shell inside a running container Manually inspect or interact with the container
10 docker rm <container_id> Remove a specific container For cleanup if not using Compose
11 docker rmi <image_id> Remove a specific image Cleanup unused Docker images

🔧 Setup Environment via Docker

🧠 First-time setup (build & run containers + create network)

Ensure Docker Desktop is running on your system. Then open terminal in your project root and run:

docker compose -f mongodb.yaml up

Or run it in the background:

docker compose -f mongodb.yaml up -d

✅ To stop environment (but keep containers for later use):

docker compose -f mongodb.yaml stop

🔁 Restart later without rebuilding containers:

docker compose -f mongodb.yaml start

❌ Remove containers and images entirely (full clean):

docker compose -f mongodb.yaml down

💾 Will MongoDB Data Be Lost After Stopping Docker?

✅ To ensure persistent storage, declare volumes explicitly:

version: "3.8"

services:
  mongo:
    image: mongo
    ports:
      - "27017:27017"
    environment:
      MONGO_INITDB_ROOT_USERNAME: admin
      MONGO_INITDB_ROOT_PASSWORD: qwerty
    volumes:
      - D:/gitProjectsTanvirAnjomSiddique/All_Github_Projects/docker-testapp/data:/data/db

  mongo-express:
    image: mongo-express
    ports:
      - "8081:8081"
    environment:
      ME_CONFIG_MONGODB_ADMINUSERNAME: admin
      ME_CONFIG_MONGODB_ADMINPASSWORD: qwerty
      ME_CONFIG_MONGODB_URL: mongodb://admin:qwerty@mongo:27017/

volumes:
  mongodb_data:

To remove persistent data manually:

docker volume rm mongodb_data

🧱 Setup MongoDB via Mongo Express

⚙️ Run Node.js Server

Make sure Node.js is installed.

npm install
node server.js

Expected output:

[
  {
    "_id": "686f916e9c6b5f37b65bd45d",
    "username": "Jane Doe",
    "email": "jane@gmail.com",
    "password": "password"
  }
]

🐋 Dockerize Node.js App

Dockerfile structure:

FROM node
WORKDIR /docker-testapp
COPY . .
RUN npm install
CMD ["node", "server.js"]

Build Docker image:

docker build -t testapp:1.0 .

⬆️ Publish Docker Image to DockerHub

docker build -t tanviranjomsiddique/testapp .
docker login
docker push tanviranjomsiddique/testapp

💾 Docker Volumes Explained

Volumes are persistent data stores.

# Bind mount from host to container
docker run -it -v D:/gitProjectsTanvirAnjomSiddique/All_Github_Projects/docker-testapp/data:/test/data ubuntu

# Inside container
cd /test/data
echo "hello!" >> data.txt
cat data.txt
exit

🔁 Docker Volumes Commands

docker volume ls              # list all volumes
docker volume create VOL     # create named volume
docker volume rm VOL         # remove specific volume
docker volume prune          # delete all unused volumes

Types of Mounts:

🌐 Docker Networks

docker network ls
docker network create myNetwork

Types of networks: