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Everything You Need to Know About DNS – Fully Explained with Hands-On Demos

In this video, we dive deep into DNS (Domain Name System) — one of the most fundamental (and misunderstood) concepts in DevOps, networking, cloud engineering, and web development.



certbot certonly --manual --preferred-challenges=dns --key-type rsa --email [email protected] \
--server "https://acme-v02.api.letsencrypt.org/..." --agree-tos -d \ *.devopshero.xyz -d devopshero.xyz

server {
listen 80;
server_name devopshero.xyz www.devopshero.xyz;
return 301 https://$server_name$request_uri;
location / {
proxy_pass http://localhost;
include proxy_params;
}
}

server {
listen 443 ssl;
server_name devopshero.xyz www.devopshero.xyz;

ssl_certificate /etc/letsencrypt/live/devopshero.xyz/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/devopshero.xyz/privkey.pem;

location / {
root /var/www/html;
index index.html index.htm;
}
}

Whether you're a beginner, a DevOps student, or prepping for an interview, this video will give you a complete understanding + practical demonstration of how DNS works in the real world.

🧠 What You'll Learn:
✅ What is DNS & how it works
✅ Root Domains, TLD, SLD, and Subdomains
✅ gTLDs vs ccTLDs explained with real-world examples
✅ Name Servers and their role in DNS resolution
✅ Hands-on: A, AAAA, CNAME, TXT, MX DNS records
✅ Tools: dig, nslookup, Cloudflare/Route 53 dashboards
✅ Real-world troubleshooting and DevOps use cases

🛠️ Demo Includes:
Setting up CNAME records on a real domain

Pointing subdomains to services (GitHub Pages, Cloudflare Pages, etc.)

Verifying DNS propagation

Using dig and ping to validate configurations

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#DNS #DevOps #CloudComputing #Networking #CNAME #NameServer #Linux #WebHosting #TXTrecord #MXrecord #Route53 #CloudflareDNS #YouTubeSeries #devopsengineering
network security
dns types
dns troubleshooting