🔧🕒How to install NTP Server on Ubuntu 🐧: Sync Time Locally 🖥️ & Publicly🌐 (Cybersecurity Beginners📘)

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🕒 In this step-by-step tutorial, learn how to set up your own NTP (Network Time Protocol) server on Ubuntu using Chrony! Whether you're syncing with public time servers 🌐 or creating a local time server for your internal network 🖥️, this guide has got you covered.

💻 What You’ll Learn:
✔️ Installing Chrony on Ubuntu
✔️ Syncing time with public NTP servers (like pool.ntp.org)
✔️ Configuring your Ubuntu system as a local NTP server
✔️ Allowing other devices on your network to sync from your server
✔️ Verifying synchronization status with chronyc commands
✔️ Checking network connectivity to NTP servers

📍 IP used in this demo: 10.0.2.15
🔥 Perfect for students, system admins, and anyone diving into network time management or preparing for cybersecurity labs!

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🕒 NTP Server Setup on Ubuntu (Using Chrony)
My IP: 10.0.2.15

1️⃣ Synchronizing Time with Public NTP Servers
Install Chrony (if not already installed):

sudo apt update
sudo apt install chrony
sudo systemctl status chrony

Edit Chrony Configuration:
sudo nano /etc/chrony/chrony.conf

Add the following line:
server pool.ntp.org iburst

Restart Chrony:

sudo systemctl restart chrony

Check Synchronization Status:

chronyc tracking
chronyc sources

2️⃣ Synchronizing with a Local NTP Server
Edit Chrony Configuration:

sudo nano /etc/chrony/chrony.conf
Replace or add the line:

server 10.0.2.1 iburst

3️⃣ Allowing Other Machines to Sync from Your Ubuntu Machine
Edit Chrony Configuration:

sudo nano /etc/chrony/chrony.conf

Add this line to allow your subnet:

allow 10.0.2.0/24
Restart Chrony:

sudo systemctl restart chrony

4️⃣ Checking Network Connectivity
Test NTP server reachability:

ping pool.ntp.org