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Scaling Out With Docker and Nginx
# Use a standard Node image from Docker Hub
FROM node:boron
# The Dockerfile's author
LABEL Usama Ashraf
# Create a directory in the container where the code will be placed
RUN mkdir -p /backend-dir-inside-container
# Set this as the default, working directory.
# We'll land here when we SSH into the container.
WORKDIR /backend-dir-inside-container
# Copy everything inside src to our directory in the container
#ADD ./src /backend-dir-inside-container
# Our Nginx container will forward HTTP traffic to containers of
# this image via port 3000.
EXPOSE 3000
version: '3.2'
services:
backend1:
build: ./backend
tty: true
volumes:
- './backend/src:/backend-dir-inside-container'
backend2:
build: ./backend
tty: true
volumes:
- './backend/src:/backend-dir-inside-container'
backend3:
build: ./backend
tty: true
volumes:
- './backend/src:/backend-dir-inside-container'
loadbalancer:
build: ./load-balancer
tty: true
links:
- backend1
- backend2
- backend3
ports:
- '8080:8080'
volumes:
backend:
const express = require('express')
const app = express()
app.get('/', (req, res) => {
console.log('I just received a GET request on port 3000!')
res.send('Hello World!');
})
app.listen(3000, () => console.log('I just connected on port 3000!'))
# Use the standard Nginx image from Docker Hub
FROM nginx
# The Dockerfile's author
LABEL Usama Ashraf
# Copy custom configuration file from the current directory
COPY nginx.conf /etc/nginx/nginx.conf
EXPOSE 8080
# Start Nginx when the container has provisioned.
CMD ["nginx", "-g", "daemon off;"]
events { worker_connections 1024; }
http {
upstream localhost {
server backend1:3000;
server backend2:3000;
server backend3:3000;
}
server {
listen 8080;
server_name localhost;
location / {
proxy_pass http://localhost;
proxy_set_header Host $host;
}
}
}
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