Reinstalling the Operating System

Reinstalling the Operating System (VMmanager 6)

Reinstalling the operating system allows you to reset your VPS or Dedicated Server to a clean state. UP-NETWORK uses VMmanager 6, which provides a safe, automated OS reinstallation workflow.

This guide explains how to access the reinstall interface, choose an OS template, configure SSH keys, and start the reinstall process.

---

1. Before You Start

✔ Reinstalling the OS will:

• Delete all data on the server

• reset all partitions & network configs

• reinstall the selected OS template

• generate a new root/admin password (if applicable)

❗ Make sure to:

• Backup your data before reinstalling

• Remove encryption or custom bootloaders

• Save your IPv6 configuration if you use it

---

2. Accessing the Reinstall Page

VPS

1

Access via VPS dashboard

Go to your dashboard: https://vps.upn.li

Select your VPS, open the left menu, and click Reinstall OS.

Dedicated Server

1

Access via UP-NETWORK customer area

Go to the UP-NETWORK customer area, open your dedicated server, click Manage in VMmanager, then click Reinstall OS.

---

3. Choosing an OS Template

VMmanager 6 displays all OS templates available for your service.

Available categories may include:

• Linux: Debian, Ubuntu, AlmaLinux, Rocky, CentOS Stream

• Windows Server

• BSD (FreeBSD, pfSense, etc.)

• Custom ISO (if enabled by support)

• Cloud-Init enabled images

Each OS template comes with:

• Version (example: Ubuntu 22.04 LTS)

• Architecture (x86_64)

• Cloud-Init support (if included)

• Optional SSH key injection

Choose the template you want to install.

---

4. Setting Up Access Credentials

According to VMmanager 6 standards:

A. Using a root/admin password

VMmanager can generate a new password automatically.

1

Check “Set password”

2

Enter your desired password

3

Leave blank to auto-generate (the new password will be shown after installation)

---

B. Using an SSH Key (recommended)

VMmanager 6 supports SSH key injection via Cloud-Init.

1

Tick “Use SSH key”

2

Paste your public key (format: ssh-ed25519 ... or ssh-rsa ...)

3

VMmanager will add it automatically to /root/.ssh/authorized_keys

This is the most secure method.

---

5. Optional — Custom Disk Partitioning

Depending on the OS template, VMmanager 6 may allow:

• Automatic partitioning

• Custom disk layout

• LVM or ext4 selection

• Encryption (if template supports it)

UP-NETWORK defaults to:

• ext4

• Automatic partitioning

• Recommended layout for SSD/NVMe

---

6. Starting the Reinstallation

When all settings are ready:

1

Click “Reinstall”

2

Confirm — VMmanager will ask to confirm data loss.

3

The server will reboot into ISO / deployment mode

4

Installation begins automatically

---

7. Installation Duration

Typical install times:

OS	Time
Debian/Ubuntu	30–60 seconds
AlmaLinux/Rocky	1–2 minutes
Windows Server	5–10 minutes
Custom ISO	depends on installer

The VMmanager panel will show the installation progress and status.

---

8. Retrieving Your New Login Credentials

After installation, VMmanager displays:

• The new root/admin password (if password method chosen)

• The server's IPv4

• The server’s IPv6 (if enabled)

• Access instructions

Example VMmanager output:

OS successfully installed.
Login: root
Password: ********
IPv4: XXX
IPv6: XXX

---

9. After Installation — Recommended Actions

✔ Update system packages

apt update && apt upgrade -y

✔ Reconfigure IPv6 if necessary

(see the IPv6 tutorial)

✔ Reapply your firewall rules

UP-NETWORK recommends:

• UFW (Ubuntu)

• Firewalld (RHEL)

• Windows Firewall for Windows

✔ Reimport SSH keys

If you did not use Cloud-Init SSH injection.

---

10. Troubleshooting

No network after reinstall

Check:

• ens18 or eth0 naming

• DHCP vs static assignment

• IPv6 prefix and gateway (IPV6_GTW)

Password not working

• VMmanager may enforce Cloud-Init for certain templates

• Use SSH key method instead

• Check the VMmanager console (VNC / HTML5)

Stuck on “installing OS”

Possible causes:

• Custom ISO errors

• Disk full

• Bootloader lock

• Corrupted FS

Open a ticket and UP-NETWORK engineers will assist you.

---

Summary

• All reinstallations are done through VMmanager 6

• Choose your OS → set password/SSH → reinstall

• The server reboots and wipes all data

• New login credentials are displayed after installation