🌈🌈🌈 Initial commit 🌈🌈🌈

Author: monodot

.gitignore

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+node_modules

README.md

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+# docker-network-demo
+
+**A demo of joining two Docker containers to a network.** This demo involves two containers, one for an application and one for a database. Both containers are joined to a _user-defined bridge network_, and the application container fetches data from the database.
+
+The application itself is a simple Node.js application that uses the [Express](https://expressjs.com/) framework. It exposes a REST API at `localhost:8080/addresses` that fetches a list of addresses from the Postgresql database.
+
+## To run
+
+To try out this demo, first build the images:
+
+```bash
+docker build -t address-book app
+
+docker build -t address-db db
+```
+
+Then create a bridge network, and run the containers:
+
+```bash
+docker network create address-app
+
+docker run -d --name address-db --network address-app address-db:latest
+
+docker run -d --name address-book --network address-app address-book:latest
+```
+
+Now you can test the application from another container; we'll use an Alpine Linux container for this:
+
+```bash
+docker run -it --rm --network address-app alpine:latest
+```
+
+Then inside the Alpine container, install the **curl** command, and use it to test the API:
+
+```bash
+apk add --no-cache curl
+curl address-book:3000/addresses
+```
+
+You should see output like this, which proves that the application container has successfully fetched data from the database container:
+
+```json
+[{"id":1,"first_name":"John","last_name":"Doe","email":"john@example.com","phone":"555-555-5555"},{"id":2,"first_name":"Jane","last_name":"Doe","email":"jane@example.com","phone":"555-555-5557"},{"id":3,"first_name":"Susan","last_name":"Smith","email":"susan@example.com","phone":"555-555-5558"},{"id":4,"first_name":"Bob","last_name":"Smith","email":"bob@example.com","phone":"555-555-5559"}]
+```
+
+## Cleanup
+
+```bash
+$ docker stop address-book address-db
+$ docker rm address-book address-db
+$ docker network rm address-app
+```
+
+## License
+
+MIT

app/Dockerfile

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+FROM docker.io/library/node:18
+
+WORKDIR /app
+
+COPY package.json .
+
+RUN npm install
+
+COPY . .
+
+CMD ["node", "server.js"]