How To Setup Subdomains & LetsEncrypt On NGINX

Managing several domains and ensuring them with SSL/TLS certificates is common in running a website. This post will walk over creating subdomains and obtaining free SSL/TLS certificates on an NGINX web server with LetsEncrypt.

Prerequisites

• An NGINX web server housed on your machine
• A domain name you own and manage
• SSH access to your server

Install LetsEncrypt Client

We must first install the LetsEncrypt client so that we may get and renew SSL/TLS certificates:

sudo apt install certbot python3-certbot-nginx -y

Set NGINX for Subdomains

We will next arrange NGINX to manage our subdomains. Write a fresh configuration file for every subdomain:

sudo nano /etc/nginx/conf.d/subdomain.example.com.conf

Add the following material, substituting your real subdomain for “subdomain.example.com” and “path/to/your/website” with the proper path:

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

    location / {
        root /path/to/your/website;
        index index.html index.htm index.nginx-debian.html;
    }
}

Proceed this with every subdomain you wish to set up.

Also Check: How to Install Docker on Ubuntu 22.04

Get SSL/TLS Certificates via LetsEncrypt

Let’s now obtain SSL/TLS certificates with LetsEncrypt:

sudo certbot --nginx -d example.com -d www.example.com -d subdomain.example.com

Swap your real domain and subdomains for “example.com,” “www.example.com,” and “subdomain.example.com”. Use the prompts to finish the certificate-acquiring process.

Check SSL/TLS Settings

Visit your domain and subdomain in a web browser to confirm that your SSL/TLS setup is operational. See the padlock icon to indicate a safe connection.

Automate Certificate Renewal

Since LetsEncrypt certificates are good for ninety days, we must arrange automatic renewal. Make a cron task to update the certificates:

sudo crontab -e

Add this line to renew the certificates once a month:

0 0 1 * * /usr/bin/certbot renew --quiet

Conclusion

At last Using LetsEncrypt, you have now established subdomains and acquired free SSL/TLS certificates on your NGINX web server. For maximum performance and security, keep your system and NGINX setup current.

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