FAQ about Stackhero for Valkey cloud

Stackhero strives to always provide a recent and stable version of Valkey, ensuring access to the latest features and full capabilities of your Valkey instance.

Valkey is an open-source fork of Redis, licensed under the permissive BSD 3-Clause licence and backed by the Linux Foundation.
Redis was historically open source under the BSD licence. In 2024, Redis Inc. (the company behind Redis) moved Redis to more restrictive source-available licences (RSALv2 and SSPLv1). Because of that, the Linux Foundation, the Redis community, and some core maintainers created Valkey, a fork of the last open-source version of Redis.
Redis later returned to open source with Redis 8 in 2025 under the AGPLv3 licence. Valkey keeps the permissive BSD licence, has its own development team, regular updates, and new features.

Yes, Valkey is fully open source under the permissive BSD 3-Clause licence. It is a community-driven fork of Redis 7.2, created in 2024 under the Linux Foundation after Redis moved to source-available licensing. Redis itself later became open source again under the AGPLv3 licence with Redis 8 (May 2025), so today both Valkey and Redis are open source. See the official Valkey website for more information.

Valkey is licensed under the BSD 3-Clause licence, the same permissive open source licence Redis used before 2024. BSD 3-Clause is OSI-approved and lets you use, modify, and redistribute Valkey freely, including in commercial contexts. Valkey is backed by the Linux Foundation. See valkey.io for more information.

We do not restrict access to any Valkey command. You have full and unlimited access.

Three modules maintained by the Valkey project are included at no extra cost, under the same BSD 3-Clause licence as Valkey itself: search (valkey-search) for secondary indexing and vector search, JSON (valkey-json) for native JSON document support, and Bloom (valkey-bloom) for Bloom filters.
They are disabled by default. Enable the ones you need from the "Modules" option in your service configuration, and your Valkey service will restart with them loaded.
Important: once you have stored data of a module type, you should keep that module enabled, as Valkey requires it to read that data back.
See the Valkey modules documentation for further details.

Yes. The search module indexes vector embeddings and supports similarity queries (exact KNN and approximate search with HNSW), so you can implement semantic search, recommendation systems, and retrieval-augmented generation without adding a separate vector database to your stack.
You can combine a vector query with filters on numeric, tag, and text fields in a single request.
Note that valkey-search implements a focused set of FT.* commands (FT.CREATE, FT.SEARCH, FT.AGGREGATE, FT.INFO, FT.DROPINDEX). If you require the full range of advanced full-text features, the search query engine of Redis offers broader coverage.
See the Valkey search documentation for the query syntax.

No, and that is exactly the value Stackhero offers. There is no server for you to manage: Stackhero takes care of the operating system, security patches, service configuration, TLS certificates, firewall, monitoring, and daily atomic backups.
Everything you would normally do via SSH is available as a supervised action in your dashboard, with a single click: change the configuration, upgrade to a new version, resize the instance, open or close a port, or restore a backup.
You retain full access to the service itself, its admin console, its APIs, and your data. Nothing belonging to your application is out of your reach.
This also reduces your attack surface: there is no SSH key to rotate, leak, or be brute-forced.
If the dashboard does not provide an option you need, please let us know. Extending the configuration page is how the platform evolves.

No. That is precisely the purpose of Stackhero: you benefit from a production-ready Valkey without needing to hire anyone to operate it. No provisioning, no operating system to update, no backup scripts to write or test, no monitoring stack to set up, no on-call rota to manage.
Your team can focus on what makes your product unique, and all the infrastructure work that used to take weeks simply disappears.

Absolutely! Your instance has its own firewall where you can decide which IPs have access to which port in two clicks.

Premium support is included with every plan at no additional cost. There are no support tiers to purchase and no priority support fees. Support is available via email and online chat during office hours, from 9am to 6pm Central European Time. Typically, you will receive a first response within the hour.

Outside these hours, your services continue to be monitored. Stackhero provides 24/7 monitoring. If downtime is detected, automated remediation is triggered immediately, and an on-call engineer is alerted if the issue is not resolved. You do not need to be the first to notice an incident. You also do not need to manage your own on-call rota.

Everything is included. The price displayed on the pricing page is the total amount you pay: the service itself, the dedicated and isolated infrastructure it runs on, unlimited and unmetered network traffic, daily atomic backups and their storage, free and unlimited backup restorations, updates and version upgrades, TLS certificates, your custom domain, the firewall, monitoring, and premium support.
There are no setup fees, no per-user or per-seat charges, no support add-ons, no traffic costs, and no fees for restoring a backup.

At the start of each month, our system calculates how many hours your services were running and generates a detailed invoice.
You receive a single monthly invoice covering all your services, presented clearly and easy to understand. Your accounts department will appreciate that!
There is no commitment: you can stop billing for a service with a single click, and you are only charged for the hours it was active.

Stackhero is a French company operating under European and French laws.
Servers are located, depending on your choice, either in the European Union (France) or in the USA.
Backups are stored in the European Union.

Your data is backed up automatically at least once per day for every service and every plan. Additional backups are also taken automatically during sensitive operations such as updates or upgrades.
Retention: one backup per day is kept for 7 days, one per week for 1 month, and one per month for 3 months.
Each backup is stored in a vault located at least 200 km from the datacentre hosting your service, so a physical incident cannot affect both sites at once.
You can restore backups at any time, as often as needed, with a single click. There are no restoration fees or limits on the number of restores.

The issue with traditional backup systems is that files are saved at different time intervals.
Let's say you have 2 files, a.txt and b.txt. Your backup starts at 9am and finishes at 10am.
The file a.txt will contain data from 9am and b.txt will contain data from 10am.
This is typical in backup systems and presents a significant problem leading to consistency issues.

This is why we developed an in-house backup system that captures an atomic image of your instance at a precise moment.
Atomic in the sense that we can guarantee all files from the backup are taken exactly at the same time.
If your backup starts at 9am, all files will have data from 9am. You have a perfectly consistent and reliable backup.

Backups are initially sent to a dedicated server, which verifies and validates the data. Once these checks are approved, the backups are encrypted and archived.
Encryption employs ECDH and Curve25519 as part of the OpenPGP protocol, with a unique key generated for each backup.

Your service consists of several subservices, each running in containers within an environment dedicated exclusively to you.
This environment is private and isolated from other customers, ensuring a high level of security and optimal performance.
Everything is hosted on a bare-metal server running Stackhero DC OS, our own Linux distribution, with disks physically connected to your instance to provide maximum IOPS.

This isolation is achieved through a dedicated virtual machine for each customer, rather than shared containers on a multi-tenant host.

We use disks that are physically connected to your instances.
We do not use network disks, unlike traditional cloud solutions, which are slow and costly.
This way, we ensure optimal performance and exceptional IOPS.

We developed our own cloud software solution, making us entirely independent from cloud providers. We deploy this innovative solution directly on bare-metal servers, offering you exceptional performance and stability.

Stackhero is a French company established in 2009. The platform itself was launched in 2018, following two years of development, and has been running production workloads ever since.
The company is profitable and independent, with no external investors and no planned exit. This stability is important when choosing a provider to host a service that is not easily moved. Stackhero is designed to be here in ten years' time.

As soon as you choose the European region for your service, yes, and in the fullest sense: Stackhero is a European company, subject to European law, with software infrastructure designed and managed in-house, in datacentres located in Europe.
It is not simply a management layer on top of a hyperscaler. No part of your service depends on a non-European provider.

Both benefit from the same platform. A startup can launch its first Valkey in production within two minutes on the smallest plan, then scale up to dozens of vCPUs as the product grows, without changing provider or migrating anything.
Larger organisations have access to the features they need (included for all companies on all plans): ISO 27001 certification, a GDPR-compliant Data Processing Agreement, a contractual 99.9% SLA, dedicated and isolated infrastructure, and a single monthly invoice that is straightforward for accounts to process.
In all cases, you simply need to adjust the size of the instance.

The primary mission of Stackhero is to provide a platform that is easy to use, extremely reliable, and highly secure.
A key element in achieving this mission is the annual attainment of the ISO 27001 certification, a globally recognised quality and security label.
This certification, awarded following a rigorous audit conducted by an independent external body, attests to compliance with the strictest international standards in information security.