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Reinstall

Proxmox KVM module WHMCS

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The Reinstall page allows clients to reinstall the operating system on their virtual machine. This is a destructive operation that replaces the current OS with a fresh installation from the selected template.

Process

  1. Navigate to the service and click Reinstall in the sidebar or from the action buttons on the overview page.
  2. A warning is displayed: reinstalling will completely remove all data on all disks of the virtual machine, and all snapshots will also be deleted.
  3. Select the desired operating system from the Select operating system dropdown. The available options are configured by the administrator in the product settings.
  4. To protect against accidental reinstallation, type the word REINSTALL in the confirmation field.
  5. Click the Reinstall button to begin the process.

Reinstall page

What Happens During Reinstall

  • The VM is stopped if currently running.
  • All data on all disks is destroyed.
  • All existing snapshots are deleted.
  • The VM is redeployed from the selected OS template using the module's deploy pipeline.
  • Cloud-init configuration is reapplied (hostname, IP addresses, DNS, user credentials).
  • Network identity is preserved — the original IPv4/IPv6 addresses, the same network card MAC address, the VLAN tag and the VMID are kept so that inventory systems, firewalls and DNS records continue to work without changes.
  • A new root password is generated and sent to the client via email.

Backups survive a reinstall. The reinstall procedure explicitly deletes only the VM's disks and snapshots — any existing backup archives are kept intact. This gives you a safety net: even after reinstalling a brand-new OS, you can still restore a previous backup to return to the pre-reinstall state. Use this carefully.

Important Notes

  • This operation is irreversible for the data on the VM disks. All data will be permanently lost.
  • The Reinstall feature must be enabled in the product's Client Area Permissions by the administrator.
  • Only OS templates approved by the administrator appear in the dropdown list.
  • The VM must not be locked by another operation (backup, snapshot, migration) when initiating a reinstall.
  • The REINSTALL confirmation word must be typed in capital letters exactly — it's an intentional speed-bump to prevent accidental reinstalls.
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