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How to Change Hostname in Linux | Step-by-Step Guide for Beginners

In this step-by-step tutorial, you’ll learn *how to change the hostname in Linux* quickly and easily. Whether you’re using **Ubuntu, Debian, CentOS, Fedora, or any other Linux distribution**, updating the hostname is a simple yet important task that can help personalize your system or configure it for network use.

The *hostname* is the name assigned to your system on a network. Changing it can make it easier to identify your machine in a multi-computer environment, especially when working with servers, virtual machines, or cloud instances.

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🛠️ *What You’ll Learn in This Video:*

What a hostname is and why it matters in Linux
How to check your current hostname using the `hostname` and `hostnamectl` commands
How to temporarily change the hostname (valid until reboot)
How to permanently change the hostname in Linux
Editing configuration files like `/etc/hostname` and `/etc/hosts`
Applying hostname changes without rebooting
Verifying the updated hostname

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📌 *Step-by-Step Commands:*

1. *Check current hostname:*

```bash
hostname
hostnamectl
```

2. *Change hostname temporarily:*

```bash
sudo hostname new-hostname
```

3. *Change hostname permanently (recommended):*

```bash
sudo hostnamectl set-hostname new-hostname
```

4. *Edit hosts file (optional but recommended):*

```bash
sudo nano /etc/hosts
```

Update the old hostname entry to the new one.

5. *Verify changes:*

```bash
hostnamectl
```

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💡 *Pro Tips:*

Always choose a *simple, lowercase hostname* without spaces or special characters.
Use `hostnamectl` for permanent changes—it’s the most reliable method across Linux distributions.
If you’re on a **cloud server (AWS, Azure, GCP)**, check provider-specific settings, as some may override hostname changes after a reboot.

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