Apache CloudStack
| License | FOSS problems | Maintenance | SSO | Users | Tested |
|---|---|---|---|---|---|
| Apache-2.0Permissive license. Like MIT, but each contributor grants users a patent licence covering their contribution, preventing later suits. | — | Active | — | Unlimited | ❌ |
Description
Apache CloudStack is an open-source IaaS platform — a single integrated deployable covering compute, storage, and networking, rather than OpenStack's many independently operated services (Nova, Cinder, Neutron, Keystone, and the rest). Originally built by Cloud.com, acquired by Citrix in 2011, donated to the Apache Software Foundation in 2012, and a Top-Level Project since 2013.
Features
- Single integrated management server — one deployable rather than a stack of independently operated services, lower operational overhead than assembling OpenStack's equivalent.
- Multi-hypervisor support — KVM, VMware, Xen, and others behind one control plane.
- Production-ready out of the box — a working multi-tenant cloud faster than OpenStack's assembly-required model, at the cost of the fine-grained customization that assembly buys.
Usage patterns
- Turnkey multi-tenant clouds, internal or sold externally — smaller-to-mid cloud service providers (Leaseweb, Datapipe historically) and telecoms (Telia, KDDI, British Telecom) alike use it for actual customer-facing infrastructure, not just internal IT — the internal-vs-external line doesn't actually separate CloudStack from OpenStack the way scale and operational complexity tolerance does.
- Lower operational complexity as the deciding factor — the real trade-off against OpenStack: CloudStack gets a working multi-tenant cloud running with far less to operate, but with less room to customize or scale to OpenStack's largest deployments (telecom NFV, CERN-scale research computing).
License and governance
Apache-2.0. Governed by the Apache Software Foundation's standard model — a Project Management Committee, membership earned by individual merit rather than corporate seats, fully transparent process. A smaller ecosystem than OpenStack's OpenInfra Foundation (600+ contributing companies), but the ASF holds every project to a baseline activity requirement — an inactive one gets moved to the Attic and retired — so CloudStack's smaller scale reflects a leaner project, not a declining one.
Conclusion
Why you would — a working multi-tenant cloud with far less to operate than OpenStack's assembly of independent services, genuinely used at real scale by cloud providers and telecoms, not just a simplified toy for internal use.
Why you wouldn't — less room for the fine-grained customization and largest-scale deployments OpenStack's modular architecture buys — the same trade-off Infomaniak weighed when choosing to operate OpenStack's complexity (to the point of maintaining its Debian packaging upstream) over CloudStack's simpler, lower-overhead model.