---
title: Virtual machine rebuild
description: "This guide summarizes the steps for rebuilding (reinstalling) a VPS from the [client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/). ## Overview - “Rebuild” = Reinstalls the VPS using the selected OS template. - **When executed, all data on the disk is deleted** (cannot be restored).…"
url: "https://bestnetllc.co.jp/en/docs/virtual-machine-rebuild/"
updated: "2026-10-19"
category: "BESTNET-CLOUD"
---

# Virtual machine rebuild

This guide summarizes the steps for rebuilding (reinstalling) a VPS from the [client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/).

## Overview

- “Rebuild” = Reinstalls the VPS using the selected OS template.
- **When executed, all data on the disk is deleted** (cannot be restored).

**Important:** When you execute a rebuild, existing data on the server will be lost. If you have necessary data, be sure to back it up beforehand.

## Pre-requisites (Important)

### Backup

- If you have necessary data, be sure to back it up before rebuilding.
- If you do not have a backup option, contact support first.

### Information Required for Rebuild

- The OS you want to reinstall (e.g.: Ubuntu / Debian / Rocky / Alma / OpenSense, etc.)
- The login password to be configured after rebuild (root password)

## Operating Steps

### 1. Open the management screen for the target VPS

1. Log in to the [client portal](https://bestnetllc.co.jp/en/encyclopedia/client-portal-en/).
2. From **“Services”** in the left menu, open the target VPS (e.g.: NVPS663) and display the **“Server Details”** screen.

### 2. Open “Rebuild” from “More”

1. Click **“More”** in the top right of the screen.
2. From the displayed menu, click **“Rebuild”**.

### 3. Select an OS template

1. On the “Rebuild” page, open the **“OS Template”** dropdown.
2. Select the OS template you want to reinstall.

![Screen showing selection of OS to reinstall from the OS template dropdown](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step03_os_dropdown_annotated.png)

### 4. Set password (root)

1. Enter the password to be used after rebuild in the **“Password”** field.
2. If necessary, toggle the visibility on/off using the eye icon on the right to confirm.

![Screen for entering the root password to be used after rebuild](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step04_confirm_ok-e1767503492431.png)

### 5. Execute “VPS Reinstall” and confirm by pressing “OK”

1. Click **“VPS Reinstall”**.
2. When a confirmation dialog appears, confirm the content and click **“OK”**.

**Caution:** From this point onwards, disk initialization will take place. Be very careful not to execute this by mistake.

![Confirmation dialog before executing VPS reinstall](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step04_confirm_ok_annotated.png)

### 6. Confirm the rebuild progress

1. When you return to “Server Details”, **“REBUILD”** will be displayed in the status.
2. While “Server is executing a task” is displayed in the top right of the screen, the process is in progress.
3. If necessary, press **“Refresh”** to reload the status.

![Screen showing REBUILD status during rebuild](https://bestnetllc.co.jp/wp-content/uploads/2025/12/step05_rebuild_running_annotated.png)

### 7. Confirm completion (login verification)

- When the rebuild is complete, the status display returns to normal, and information such as Uptime is displayed.
- Verify that you can log in via SSH etc. to the displayed IP address (username: `root`, password: the one set in step 4).
- After logging in, verify that the OS template is as expected by checking the OS version, etc.

## Frequently Asked Questions / Troubleshooting

### Rebuild does not finish for a long time

- First, press “Refresh” to update the screen display.
- If there is no change for a long time after that (e.g.: tens of minutes or more), contact support via a [support ticket](https://bestnetllc.co.jp/en/encyclopedia/support-ticket-en/) with the VPS name (e.g.: NVPS663) and the situation (REBUILD remaining, etc.).
- “Cancel” may cause the process to be interrupted. Before executing, confirm the impact and consult with support if you are unsure.

### Cannot log in after rebuild

- Double-check the password you entered for typos (uppercase/lowercase, symbols).
- Verify that SSH (port 22) is permitted in security groups/firewall, etc.
- Depending on the OS template, the initial login method may differ. If the template specifications are unclear, please contact support for confirmation.