Take back your servers. Leave the public cloud.
AWS, Azure, Google Cloud, OVHcloud: you rent infrastructure you can neither audit nor take back. Bunker is an open-source cloud suite, hosted in Europe, that you run as a managed sovereign cloud or install on your own servers.
Most "alternatives" to the public cloud just move the dependence from one vendor to another. You change the logo on the invoice, the lock-in stays.
Bunker is open source and re-internalisable: you can audit the code, run it on your own hardware, and get your data back in open formats. The day you want to bring everything in-house, the code is already yours.
Why self-host instead of rent
A predictable bill
No egress fees, and a bill that stays stable month to month. Hyperscaler prices climb by around 10% a year; a suite you host keeps spending under control.
Real sovereignty
Data under European law, with no exposure to the US Cloud Act or FISA 702. For healthcare, the public sector and finance, that is often a compliance prerequisite.
Auditable code
The suite is open source. Your teams and auditors can inspect what hosts your data, line by line. No proprietary vendor can offer that.
Re-internalisable
Run it as a managed sovereign cloud, or install it on your own servers. You arbitrate on your own constraints rather than a vendor's.
Bunker against the hyperscalers
| Criterion | Bunker | AWS | OVHcloud | Jotelulu |
|---|---|---|---|---|
| Auditable open source | Yes | No | Partial (OpenStack IaaS) | No |
| Self-hostable / re-internalisable | Yes, on your hardware | No | No | No |
| Jurisdiction | Europe | Cloud Act (US) | France | Spain / EU |
| Vendor lock-in | None (open formats) | High | Medium | High (white-label) |
| Egress fees | None | Charged | Reduced | Depends on reseller |
| On-premise AI / GPU | Yes | Yes (expensive) | Yes | Not positioned |
| Model | Direct: managed or on-premise | Managed public | Managed public | Indirect, white-label |
Leave the hyperscaler without building a new prison
Migrating from AWS to another proprietary public cloud means leaving with the same constraints: closed code, specific formats, egress fees. Bunker breaks that cycle. Because the suite is open source, you keep control of the layer that runs your applications, and you decide where it runs.
In practice, you can start on our managed sovereign cloud, then gradually repatriate to your own servers when your team is ready. No further migration, no proprietary format to convert back.
The code is public.
Bunker is built in the open. Inspect the architecture, open an issue, or deploy it yourself.
View the repository on GitHubFrequently asked questions
Is Bunker really an alternative to AWS?
For most B2B workloads (servers, object storage, databases, AI), yes. Bunker covers the infrastructure an SME or mid-market company needs, open source and hosted in Europe. For very specific AWS managed services, an audit of your workloads tells apart what repatriates easily from what needs work.
Can I really self-host Bunker?
Yes. The suite is open source and the repository is public. You can install it on your own servers, or start on our managed sovereign cloud and repatriate later. You always keep the option to bring the infrastructure back in-house.
Isn't OVHcloud already a European alternative to AWS?
OVHcloud is a solid European sovereign cloud. The difference is reversibility: OVHcloud stays a platform you rent and cannot take back in-house. Bunker is open source and re-internalisable, which removes lock-in even towards us.
How much does migrating off a hyperscaler cost?
It depends on volume and dependencies. We start with an audit of the existing setup, then migrate in batches starting with the least risky workloads. The return is calculated over several years, egress fees and sovereignty included. Tell us about your project for an estimate.
Take back control of your infrastructure
We audit your existing setup and build your path, from managed sovereign cloud to self-hosting.