## Docker

Create folder with...

- `server.js`

```JS
const http = require('http')

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' })
  res.end('Hello World\n')
})

server.listen(4000)

console.log('Server running at http://localhost:4000')

```

- `package.json`

```JSON
{
  "scripts": {
    "start": "node server.js"
  }
}
```

- `Dockerfile`

```Dockerfile
FROM node:16.6.1
COPY . /src
RUN cd /src && npm install
EXPOSE 4000
CMD ["node", "/src/server.js"]
```

Build the Docker image: `docker build -t hello-world .`

Run the image in a container: `docker run -d -p 4001:4000 hello-world`

The -d flag says to run the container in the background (daemon mode).
The -p flag maps port 4000 from the container to port 4001 on the docker machine.

View your new container: `docker ps -a`

Check the logs for your container: `docker logs <container-id>`
Check the port of the container: `docker port <container-id>`

Open the app running on the docker machine: open `http://locahost:4001`

## Notes

If you make changes to your application, you will need to rebuild your image and restart your container.

The docker-machine command controls the virtual machine that is running Docker on your machine.

View logs for a docker container: `docker logs <container-id>`

List the running containers: `docker ps -a`

List all local images: `docker images`

Remove an image: `docker rmi <image-id>`

Remove a container: `docker rm <container-id>`