What is Nginx?

Nginx is a powerful web server used to serve websites and applications. It’s fast, lightweight, and can handle a lot of traffic at once. It’s also used as a reverse proxy, load balancer, and more.

Step 1: Setting Up Nginx on AWS EC2

Creating an AWS EC2 Instance

1. Sign in to AWS: Go to the AWS Management Console.

2. Launch an EC2 Instance:

   • Click on "EC2" under the "Services" menu.

   • Click "Launch Instance."

   • Choose an Amazon Machine Image (AMI) like Ubuntu or Amazon Linux.

   • Select an instance type (e.g., t2.micro for free tier).

   • Configure instance details (default settings are fine for beginners).

   • Add storage (default is 8GB, which is enough for starters).

   • Add tags (optional) and configure security groups (allow HTTP, HTTPS, and SSH).

   • Review and launch the instance.

3. Connect to Your Instance:

   • Use SSH to connect to your EC2 instance. For example:

     bash

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       ssh -i your-key.pem ubuntu@your-ec2-public-ip
     

Installing Nginx

Once you’re connected to your EC2 instance, install Nginx:

bash

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sudo apt update
sudo apt install nginx

Start Nginx and enable it to run on boot:

bash

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sudo systemctl start nginx
sudo systemctl enable nginx

Check if Nginx is running by visiting your server’s public IP in a browser. You should see the default Nginx welcome page.

Step 2: Nginx Configuration Overview

Nginx uses configuration files to control how it works. The main configuration file is located at /etc/nginx/nginx.conf. However, for hosting websites, we use server blocks (similar to virtual hosts in Apache).

Step 3: Hosting a Custom Static Website

1. Create a Website Directory:

   bash

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    sudo mkdir -p /var/www/mywebsite/html
   

2. Add Your Website Files:
   Upload your HTML, CSS, and JavaScript files to the /var/www/mywebsite/html directory.

3. Create a Server Block:
   Create a new configuration file for your website:

   bash

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    sudo nano /etc/nginx/sites-available/mywebsite
   

   Add the following:

   nginx

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    server {
        listen 80;
        server_name your-domain-or-ip;
   
        root /var/www/mywebsite/html;
        index index.html;
   
        location / {
            try_files $uri $uri/ =404;
        }
    }
   

4. Enable the Configuration:
   Create a symbolic link to enable the site:

   bash

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    sudo ln -s /etc/nginx/sites-available/mywebsite /etc/nginx/sites-enabled/
   

5. Test and Reload Nginx:
   Test the configuration for errors:

   bash

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    sudo nginx -t
   

   Reload Nginx:

   bash

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    sudo systemctl reload nginx
   

   Now, your website should be live!

Step 4: Changing the Default HTTP Port

By default, Nginx listens on port 80 for HTTP traffic. To change it:

1. Edit the Nginx configuration file:

   bash

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    sudo nano /etc/nginx/sites-available/mywebsite
   

2. Change the listen directive:

   nginx

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    listen 8080;
   

3. Reload Nginx:

   bash

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    sudo systemctl reload nginx
   

Now, your website will be accessible on port 8080.

Step 5: Nginx Logging

Nginx logs access and error messages:

• Access Logs: Located at /var/log/nginx/access.log. Tracks all requests to your server.

• Error Logs: Located at /var/log/nginx/error.log. Records errors encountered by Nginx.

You can customize logging in your server block:

nginx

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access_log /var/log/nginx/mywebsite_access.log;
error_log /var/log/nginx/mywebsite_error.log;

Step 6: Hosting Multiple Websites with Nginx

To host multiple websites, create separate server blocks for each site. For example:

nginx

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server {
    listen 80;
    server_name website1.com;
    root /var/www/website1/html;
    ...
}

server {
    listen 80;
    server_name website2.com;
    root /var/www/website2/html;
    ...
}

Enable each configuration and reload Nginx.

Step 7: Understanding MIME Types

MIME types tell browsers how to handle different file types (e.g., HTML, CSS, images). Nginx automatically detects MIME types, but you can customize them:

nginx

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types {
    text/html html;
    text/css css;
    image/png png;
}

Step 8: Using a Custom Domain with Nginx

1. Buy a Domain: Purchase a domain from a registrar like GoDaddy or Namecheap.

2. Point Domain to Your Server: Update the DNS settings to point to your EC2 instance’s public IP.

3. Update Nginx Configuration:
   Replace server_name your-domain-or-ip; with your custom domain:

   nginx

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    server_name yourdomain.com;
   

Step 9: Configuring Error Pages and Logs

To create custom error pages:

nginx

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error_page 404 /404.html;
location = /404.html {
    root /var/www/mywebsite/html;
}

Step 10: Nginx HTTPS and SSL

Secure your website with HTTPS using Let’s Encrypt:

1. Install Certbot:

   bash

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    sudo apt install certbot python3-certbot-nginx
   

2. Obtain an SSL Certificate:

   bash

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    sudo certbot --nginx -d yourdomain.com
   

3. Certbot will automatically update your Nginx configuration to use HTTPS.

Step 11: Nginx Reverse Proxy

A reverse proxy forwards client requests to backend servers. Example:

nginx

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server {
    listen 80;
    server_name yourdomain.com;

    location / {
        proxy_pass http://localhost:3000; # Forward to a Node.js app
    }
}

Step 12: Nginx Load Balancing

Distribute traffic across multiple servers:

nginx

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upstream backend {
    server 192.168.1.101;
    server 192.168.1.102;
}

server {
    listen 80;
    server_name yourdomain.com;

    location / {
        proxy_pass http://backend;
    }
}

Step 13: Nginx Backup Server

Set up a backup server for high availability:

nginx

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upstream backend {
    server 192.168.1.101;
    server 192.168.1.102 backup; # This server is used only if the primary fails
}

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