Our innovative open-source software KubePlus offers a solution to deliver any Helm chart as-a-service. It enables platform teams to deliver any Kubernetes application as-a-service to their customers.
KubePlus takes an application Helm chart and delivers it as-a-service by abstracting it under provider and consumer APIs. The consumer of the service can simply use Kubernetes native consumer API or consumer UI to provision the application. This also enables provider of the service to apply policies and monitor the instances of the application behind the scene using the provider API. This open-source KubePlus software forms the foundation for our KubePlus SaaS Manager offering.
Provider API is delivered as a CRD (named ResourceComposition) that allows creating new CRDs as consumer APIs abstracting Helm charts.
Provider API - CRD for CRDs
KubePlus offers a CRD named ResourceComposition (Provider API) to
- Compose new CRDs (Consumer APIs) to publish services from Helm charts
- Define tenant level resource policies (e.g. Node selection, CPU/Memory limits, etc.)
- Get tenant level consumption metrics for CPU/Memory/Storage/Network
Resource relationship graphs
Application instances are realized by establishing relationships between available Kubernetes Resources / APIs (built-in or Custom). These relationships are primarily of four types - (1) Owner references, (2) Labels, (3) Annotations, (4) Spec Properties. KubePlus is able to construct Kubernetes Resource relationship graphs for a running application stack. This enables KubePlus to build resource topologies and offer fine grained visibility and control at the instance or tenant level.
Creating a service using Provider API
Here we demonstrate how a multi-tenant WordPress service can be created from WordPress Helm chart. KubePlus takes Helm chart and other policy and monitoring inputs through ResourceComposition CRD as shown below to deliver a new CRD for Wordpress as-a-Service.
A new CRD named WordpressService has been created here using ResourceComposition CRD as shown above.
Creating a tenant using Consumer API
Creating tenant using consumer UI
KubePlus offers a pre-built consumer UI that wraps consumer API to simplify provisioning of the application for the consumers of the service.
Creating tenant using WordpressService CRD
Consumers can also use Consumer API / service CRD directly.
Here is a YAML definition that allows us to create first tenant using newly created WordpressService CRD.
Managing the service with Provider tooling
Resource relationship graph for the tenant1
Here is a visual representation of the complete resource relationship graph of the WordpressService instance. This can be discovered using KubePlus kubectl plugin - 'kubectl connections WordpressService wp-service-tenant1'. This is essential to troubleshoot or monitor running instances of your service.
Tenant level policies applied to the pods
Consumption metrics
Kubectl command output that shows CPU, Memory, Storage and Network consumption metrics for tenant1.
CPU utilization in Prometheus
KubePlus offers tenant level consumption metrics that can be directly discovered in any Prometheus based monitoring infrastructure.