Capsule implements a multi-tenant and policy-based environment in your Kubernetes cluster. It is designed as a micro-services-based ecosystem with the minimalist approach, leveraging only on upstream Kubernetes.

Kubernetes introduces the Namespace object type to create logical partitions of the cluster as isolated slices. However, implementing advanced multi-tenancy scenarios, it soon becomes complicated because of the flat structure of Kubernetes namespaces and the impossibility to share resources among namespaces belonging to the same tenant. To overcome this, cluster admins tend to provision a dedicated cluster for each groups of users, teams, or departments. As an organization grows, the number of clusters to manage and keep aligned becomes an operational nightmare, described as the well know phenomena of the clusters sprawl.

Capsule takes a different approach. In a single cluster, the Capsule Controller aggregates multiple namespaces in a lightweight abstraction called Tenant, basically a grouping of Kubernetes Namespaces. Within each tenant, users are free to create their namespaces and share all the assigned resources.

On the other side, the Capsule Policy Engine keeps the different tenants isolated from each other. Network and Security Policies, Resource Quota, Limit Ranges, RBAC, and other policies defined at the tenant level are automatically inherited by all the namespaces in the tenant. Then users are free to operate their tenants in autonomy, without the intervention of the cluster administrator.

Leave developers the freedom to self-provision their cluster resources according to the assigned boundaries.

Share a single cluster with multiple teams, groups of users, or departments by saving operational and management efforts.

Leverage Kubernetes Admission Controllers to enforce the industry security best practices and meet policy requirements.

Take control of the resources consumed by users while preventing them to overtake.

Provide multi-tenancy with a native Kubernetes experience without introducing additional management layers, plugins, or customized binaries.

Capsule is completely declarative and GitOps ready.

Assign to tenants a dedicated set of compute, storage, and network resources and avoid the noisy neighbors' effect.

Please, check the project documentation for the cool things you can do with Capsule.

Capsule is Open Source with Apache 2 license and any contribution is welcome.

• Q. How to pronounce Capsule?

  A. It should be pronounced as /ˈkæpsjuːl/.

• Q. Is it production grade?

  A. Although under frequent development and improvements, Capsule is ready to be used in production environments as currently, people are using it in public and private deployments. Check out the release page for a detailed list of available versions.

• Q. Does it work with my Kubernetes XYZ distribution?

  A. We tested Capsule with vanilla Kubernetes 1.16+ on private environments and public clouds. We expect it to work smoothly on any other Kubernetes distribution. Please, let us know if you find it doesn't.

• Q. Do you provide commercial support?

  A. Yes, we're available to help and provide commercial support. Clastix is the company behind Capsule. Please, contact us for a quote.