Low cost VPS server: can you boot your own ISO?
If you require a documented custom-ISO workflow, netcup’s server guide describes uploading and attaching one; IONOS’s import guide is scoped to Cloud Servers, while the reviewed OVHcloud VPS guide describes selecting a compatible listed image and does not settle custom-ISO support.
What this comparison answers
This is a documentation check, not a test of a customer control panel or a claim that every plan has the same options. It asks whether the reviewed official instructions identify a user-supplied ISO path, and whether that instruction is clearly labeled for VPS. Provider account, region, product generation, and plan can affect the controls shown; check the exact service before ordering around an installation requirement.
A listed reinstallation workflow and a custom-media workflow are different evidence. Where the reviewed page only describes compatible provider images, this article records that limit in the evidence rather than turning silence into a product restriction.
What the official pages document
| Provider page | Documented path | Scope caveat |
|---|---|---|
| netcup media documentation [A] | The control panel accepts a user-supplied ISO and lets the customer mount it as boot media through the virtual optical drive. | The page is under netcup server documentation and explicitly discusses VPS/server features. It warns that BIOS compatibility may depend on the operating system and that installing a new OS removes existing hard-drive contents. |
| IONOS ISO import [B] | Import an ISO from a URL, choose whether it is an application or operating system, and select a data center. | The guide labels its scope “Cloud Servers.” Do not apply its workflow or stated image-size limit to an IONOS VPS contract without matching product documentation. |
| IONOS VPS getting started [C] | For VPS products managed in Cloud Panel, the guide describes actions including opening a remote console and reinstalling an image. | This VPS guide does not establish that the Cloud Server ISO import path is available to VPS customers. |
| OVHcloud VPS management [D] | Reinstall by choosing an operating system from the compatible options shown in the control panel. | The reviewed page documents that selection route. It does not establish whether custom ISO upload is supported or unavailable. |
Decision rule: require an explicit VPS match
Before choosing a low-cost VPS for a custom OS, ask the provider to confirm the exact product family, whether you can supply the ISO or only choose a listed image, and which boot mode and disk-erasure conditions apply. Save the answer with the plan details.
On the reviewed evidence, netcup documents a custom ISO path in its server documentation. IONOS documents ISO import for Cloud Servers, but the reviewed VPS guide is a separate scope. OVHcloud documents a VPS reinstall picker; the cited page alone cannot answer the custom-ISO question. This is a difference in documented evidence, not a ranking of providers.
Pre-purchase check
- Write down the exact product family and plan shown on the order page. Do not treat “cloud server” and “VPS” labels as interchangeable.
- Open the provider’s official instructions for that product. Search the page for an explicit user-uploaded ISO or custom-media action, not just “reinstall.”
- Confirm how the image is supplied (for example, upload versus URL), where it is attached, and whether the documented workflow applies to your region and plan. The reviewed IONOS import guide describes a URL-based import for Cloud Servers; the netcup page describes upload and attachment.
- Ask whether the installer formats the system disk and what happens to additional disks. The netcup guide warns that installing a new operating system removes data from the server hard drive; back up and verify the exact service instructions before starting.
- Keep the provider’s written answer and the source URL beside your order record. If the official page does not answer the requirement, mark it “unconfirmed” and obtain product-specific confirmation before buying.
Image-size figure and its limit
The IONOS ISO-import guide states a maximum image size of 500 GB for the Cloud Server image-import process. That number belongs to the cited Cloud Server workflow; it is not evidence of an IONOS VPS limit or of a netcup/OVHcloud limit. No other capacity, price, or compatibility figure is inferred here. [B]
Questions buyers ask
Can I install my own ISO on any low cost VPS?
The reviewed documents do not support a universal yes. netcup documents a customer-supplied ISO workflow for its server products. IONOS’s import instructions are explicitly for Cloud Servers, and the reviewed OVHcloud VPS page covers listed compatible images without resolving custom-media support. Match the instructions to the exact VPS product before relying on them. [A] [B] [D]
Evidence and number sources
Official pages checked October 14, 2026. The date is this review date, not a provider promise or offer expiry. No account was accessed and no ISO was installed.
- [A] netcup Server Media documentation: Media. Basis for the custom ISO upload/attach workflow, BIOS compatibility caveat, and data-removal warning for a new OS installation.
- [B] IONOS Help: Importing an ISO Image. Page labels the feature for Cloud Servers; basis for the URL import steps and the 500 GB maximum image size stated for that workflow.
- [C] IONOS Help: VPS: Getting started. Basis for the separate VPS product scope and documented Cloud Panel image-reinstall action.
- [D] OVHcloud Documentation: VPS management from the Control Panel. Basis for reinstalling from the compatible OS options shown; this page does not resolve custom ISO availability.
Download the dated comparison
This CSV records each documentation path with its product-scope caveat and buyer check.
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Before ordering, confirm in writing that the custom installation path is available for the exact product and plan. For data-preservation questions during a standard OS reinstall, see the separate guide on what survives an operating system reinstall.