Let's Encrypt with Certbot in Nginx - Mini Project: Build & Apply

Let's Encrypt with Certbot

📖 Scenario: You are setting up a secure website using nginx web server. To make your website safe, you want to add a free SSL certificate from Let's Encrypt. This certificate will encrypt the data between your website and visitors.We will use Certbot, a tool that helps get and install these certificates automatically.

🎯 Goal: Learn how to configure nginx and use Certbot to get a Let's Encrypt SSL certificate and enable HTTPS on your website.

📋 What You'll Learn

Create a basic nginx server block configuration file for your domain

Add a variable for your domain name

Use Certbot command to request and install the SSL certificate

Show the nginx status to confirm HTTPS is enabled

💡 Why This Matters

🌍 Real World

Websites need SSL certificates to secure user data and improve trust. Let's Encrypt provides free certificates, and Certbot automates their installation and renewal.

💼 Career

Many DevOps and system administrator roles require setting up secure web servers with automated SSL management to ensure safe and reliable web services.

1

Create nginx server block configuration

Create a file named /etc/nginx/sites-available/example.com with this exact content:

server {
    listen 80;
    server_name example.com www.example.com;

    root /var/www/example.com/html;
    index index.html;

    location / {
        try_files $uri $uri/ =404;
    }
}

Nginx

# Create the nginx server block configuration file with the exact content
# Your code here

Hint

This is the basic nginx configuration for your website listening on port 80 (HTTP).

2

Add domain variable for Certbot

Create a shell variable named DOMAIN and set it to example.com.

Nginx

server {
    listen 80;
    server_name example.com www.example.com;

    root /var/www/example.com/html;
    index index.html;

    location / {
        try_files $uri $uri/ =404;
    }
}

# Define the domain variable
# Your code here

Hint

This variable will be used in the Certbot command to specify your domain.

3

Request and install SSL certificate with Certbot

Write the Certbot command to request and install a Let's Encrypt SSL certificate for the domain stored in $DOMAIN. Use the nginx plugin and run it in non-interactive mode with email [e-mail] and agree to terms of service.

Nginx

server {
    listen 80;
    server_name example.com www.example.com;

    root /var/www/example.com/html;
    index index.html;

    location / {
        try_files $uri $uri/ =404;
    }
}

DOMAIN=example.com

# Run Certbot command to get and install SSL certificate
# Your code here

Hint

This command tells Certbot to use the nginx plugin to automatically configure SSL for your domain.

4

Check nginx status to confirm HTTPS

Write the command to check the nginx service status to confirm it is running with the new SSL configuration.

Nginx

server {
    listen 80;
    server_name example.com www.example.com;

    root /var/www/example.com/html;
    index index.html;

    location / {
        try_files $uri $uri/ =404;
    }
}

DOMAIN=example.com

sudo certbot --nginx -d $DOMAIN -d www.$DOMAIN --non-interactive --agree-tos --email [e-mail]

# Check nginx service status
# Your code here

Hint

This command shows if nginx is active and running with the new SSL setup.

Practice

1. What is the main purpose of using Certbot with nginx when working with Let's Encrypt?

easy

A. To create backups of nginx configuration files

B. To configure nginx to serve static files faster

C. To monitor server performance and uptime

D. To automatically obtain and install SSL certificates for secure HTTPS connections

Solution

1. Step 1: Understand Certbot's role

   Certbot is a tool designed to automate the process of obtaining SSL certificates from Let's Encrypt.

2. Step 2: Connect Certbot with nginx

   Certbot can automatically configure nginx to use these certificates, enabling HTTPS.

3. Final Answer:

   To automatically obtain and install SSL certificates for secure HTTPS connections -> Option D

4. Quick Check:

   Certbot = SSL automation [OK]

Hint: Certbot automates SSL setup for nginx [OK]

Common Mistakes:

• Thinking Certbot monitors server performance
• Confusing Certbot with backup tools
• Believing Certbot speeds up static file delivery

2. Which of the following is the correct command to obtain and install a certificate for nginx using Certbot?

easy

A. certbot renew --nginx

B. certbot --nginx -d example.com

C. certbot --apache -d example.com

D. certbot install --nginx example.com

Solution

1. Step 1: Identify the command to obtain and install

   The command to get and install a certificate for nginx is 'certbot --nginx -d domain'.

2. Step 2: Check options correctness

   certbot --nginx -d example.com uses '--nginx' and '-d example.com' correctly. certbot --apache -d example.com is for Apache, A is for renewal, D is invalid syntax.

3. Final Answer:

   certbot --nginx -d example.com -> Option B

4. Quick Check:

   Certbot obtain + nginx = certbot --nginx -d [OK]

Hint: Use '--nginx' flag with '-d' domain to get cert [OK]

Common Mistakes:

• Using '--apache' flag for nginx
• Confusing 'renew' with 'obtain' commands
• Using invalid 'install' subcommand

3. After running certbot --nginx -d example.com successfully, what will be the expected change in the nginx configuration?

medium

A. nginx config will include SSL directives and listen on port 443

B. nginx will stop serving HTTP requests

C. nginx config will remove all server blocks

D. nginx will only serve HTTP on port 80

Solution

1. Step 1: Understand Certbot's nginx plugin effect

   Certbot modifies nginx config to add SSL settings and enable HTTPS on port 443.

2. Step 2: Analyze expected config changes

   It does not remove server blocks or disable HTTP; it adds SSL directives alongside HTTP.

3. Final Answer:

   nginx config will include SSL directives and listen on port 443 -> Option A

4. Quick Check:

   Certbot adds SSL and port 443 config [OK]

Hint: Certbot adds SSL and port 443 to nginx config [OK]

Common Mistakes:

• Thinking HTTP is disabled after certbot run
• Believing server blocks are deleted
• Assuming nginx only listens on port 80

4. You ran certbot --nginx -d example.com but got an error: Failed authorization procedure. What is the most likely cause?

medium

A. Certbot version is too new

B. nginx is not installed on the server

C. Port 80 is blocked or not accessible from the internet

D. The domain name is misspelled in the command

Solution

1. Step 1: Understand the error meaning

   'Failed authorization procedure' means Let's Encrypt could not verify domain ownership.

2. Step 2: Identify common cause

   Let's Encrypt uses HTTP challenge on port 80; if blocked, verification fails.

3. Final Answer:

   Port 80 is blocked or not accessible from the internet -> Option C

4. Quick Check:

   Port 80 open = authorization success [OK]

Hint: Check port 80 accessibility for HTTP challenge [OK]

Common Mistakes:

• Assuming nginx absence causes authorization error
• Ignoring domain spelling mistakes
• Blaming Certbot version without checking network

5. You want to automate renewal of your Let's Encrypt certificates on nginx using Certbot. Which approach is best?

hard

A. Set up a cron job to run certbot renew --quiet regularly

B. Manually run certbot --nginx -d example.com every month

C. Restart nginx daily to trigger automatic renewal

D. Delete old certificates and request new ones weekly

Solution

1. Step 1: Understand Certbot renewal process

   Certbot can renew certificates automatically using the 'renew' command.

2. Step 2: Automate renewal with cron

   Setting a cron job to run 'certbot renew --quiet' regularly ensures certificates renew before expiry without manual work.

3. Final Answer:

   Set up a cron job to run certbot renew --quiet regularly -> Option A

4. Quick Check:

   Automate renewal with cron + certbot renew [OK]

Hint: Use cron with 'certbot renew --quiet' for auto-renewal [OK]

Common Mistakes:

• Manually renewing certificates often
• Restarting nginx does not renew certs
• Deleting certs causes downtime and errors