Apache CloudStack

Apache CloudStack is self-hosted software for deploying and managing IaaS clouds built from virtual machines. It is aimed at cloud providers, managed service providers, telcos, and enterprises with the capacity to operate their own infrastructure. Its appeal is broad control across hypervisors and management interfaces; the tradeoff is that operators retain substantial security and maintenance responsibilities.

Overview

CloudStack brings compute orchestration, network services, account management, and resource accounting into a platform for public, private, and hybrid clouds. It can manage tens of thousands of physical servers across geographically distributed data centers, making it a credible option for organizations running infrastructure at considerable scale. That capacity is useful only when the organization can support the underlying environment; CloudStack is not a hosted service that takes infrastructure operations off its hands.

Administrators can manage a cloud through a web UI, command-line tools, or a RESTful API. Optional AWS EC2- and S3-compatible APIs may suit teams whose workflows already use those interfaces. The Apache License, Version 2.0 means there is no software license fee, but the organization still needs to provide and operate the infrastructure.

Key features

Compute and management

CloudStack supports XenServer or XCP, KVM, Hyper-V, and VMware ESXi with vSphere; its supported hypervisors also include BareMetal, LXC, and Xen Project. This range gives infrastructure teams flexibility when building around different virtualization environments. It does not remove the work of operating and maintaining the chosen hosts.

High availability, live migration, and disaster recovery are supported alongside compute orchestration. These capabilities address important infrastructure needs, but the project does not thereby assume responsibility for the reliability or security of an operator’s deployment.

Identity, storage, and integrations

Authentication options include OAuth2 single sign-on, two-factor authentication, TOTP, SAML, and LDAP. Storage support includes iSCSI and NFS, Ceph RBD with KVM, volume encryption, snapshots, and storage tiering. Together, these options give administrators several ways to fit access and storage into an environment, while leaving configuration and ongoing protection to the operator.

Integrations include Terraform, Ansible, Kubernetes, Prometheus, VMware NSX, Ceph, MinIO, and billing portals. Long Term Support releases receive bug and security fixes for 18 months after the main release, a defined support window that teams should factor into upgrade planning.

Pricing

Apache CloudStack: free. The free, open-source IaaS software is suitable for organizations willing to run and maintain their own cloud. There is no commercial plan pricing listed; the free license does not cover infrastructure or the operational work of securing and monitoring it.

Platforms

CloudStack is self-hosted and supports Linux, web access, and API access. Its deployment model suits teams that need to operate their cloud environment directly, rather than use a service hosted for them.

Who it's for

Cloud solution providers, managed service providers, telcos, and enterprises are the clearest fit. The scale and range of interfaces make CloudStack relevant to organizations building or managing their own IaaS, particularly when they need a choice of hypervisors. Smaller teams without capacity for infrastructure operations should look for a managed approach instead.

Security is an explicit operator responsibility: protections against denial-of-service and brute-force attacks, monitoring, and securing hosts, management servers, system VMs, and routers all remain with the organization. Potential vulnerabilities in a released version should be reported to the Apache Software Foundation security team by email. Community help is available through the project mailing list, and some companies offer commercial support.

Pros and cons

• Pros: Broad hypervisor support gives infrastructure teams options across BareMetal, Hyper-V, KVM, LXC, vSphere via vCenter, XenServer, and Xen Project.
• Pros: Web, command-line, and API management provide different ways to operate the cloud, with optional EC2- and S3-compatible APIs.
• Pros: High availability, live migration, disaster recovery, and multiple storage options address needs of large self-managed environments.
• Cons: Operators must secure and monitor the full environment, including hosts and system components; the software does not remove that burden.
• Cons: Long Term Support releases receive fixes for 18 months after the main release, so teams need to plan around that support period.

Alternatives

For a different route to infrastructure orchestration, Cloudify offers a free Community plan with no time limit, but requires Docker or a VM setup and a cloud provider to run workloads. Rancher is another open-source option with community support on its free plan. OpenNebula offers a Community Edition described as a complete core platform with public open-source releases and no stated host limit.

If the need is infrastructure as code rather than a cloud management platform, Terraform has a free plan capped at 500 managed resources, one concurrent remote run, and one concurrent agent run; OpenTofu is a free, open-source infrastructure-as-code tool. Kubernetes is a free open-source platform, while Pulumi offers a free plan limited to one user and up to 500 workflow minutes. Spacelift may suit teams comparing infrastructure automation plans; its free tier covers two users and one public worker.

Browse more options in Cloud Orchestration Software, Virtualization Management Software, Multi-Cloud Management Software, Cloud Management Software, and Cloud Automation Software.

Verdict

Choose Apache CloudStack if your organization needs self-hosted IaaS with broad hypervisor choice and can take responsibility for operating and securing it. Its scale, access options, and infrastructure capabilities make it a strong fit for providers and larger enterprises; teams seeking a managed cloud or relief from security operations should look elsewhere.