Central API MVP

Right now, this repository implements issue 374. It contains a script (gen.py) to mirror all crossplane openstack provider cluster-scoped resources to namespaced resources in an SCS API group.

Also, these instructions are striving to implement namespaces as isolation mechanism to implement a multi-tenant system backed by a single Kubernetes cluster.

crossplane-contrib/x-generation might be used as soon as the required feature for namespace mapping is implemented.

Quick Start

1. Setup testing Kubernetes cluster
2. Install crossplane
3. Select fitting configuration package (containing provider definitions, XRD's and composites) and install it

   export VERSION=...
   export XPKG=... # openstack / kubernetes
   crossplane xpkg install configuration registry.scs.community/central-api/$XPKG:$VERSION
4. Setup provider config (wearing CSP hat)

   apiVersion: v1
   kind: Namespace
   metadata:
     name: tenant-name
   ---
   apiVersion: openstack.upbound.io/v1beta1
   kind: ProviderConfig
   metadata:
     name: tenant-name
   spec:
     credentials:
       secretRef:
         namespace: crossplane-system
         name: tenant-name-clouds-yaml
         key: clouds.json
       source: Secret
   ---
   apiVersion: v1
   kind: Secret
   metadata:
     name: tenant-name-clouds-yaml
     namespace: crossplane-system
   stringData:
     clouds.json: |
       {
         "auth_url": "https://api.gx-scs.sovereignit.cloud:5000",
         "application_credential_id": "...",
         "application_credential_secret": "...",
         "tenant_name": "tenant-name"
       }
5. Setup RBAC for tenants (wearing CSP hat)

   apiVersion: rbac.authorization.k8s.io/v1
   kind: ClusterRole
   metadata:
     name: tenant
   rules:
   - apiGroups:
     - api.scs.community
     resources:
     - '*'
     verbs:
     - '*'
   ---
   apiVersion: v1
   kind: ServiceAccount
   metadata:
     name: tenant
     namespace: tenant-name
   ---
   apiVersion: rbac.authorization.k8s.io/v1
   kind: RoleBinding
   metadata:
     name: scs-bind
     namespace: tenant-name
   roleRef:
     apiGroup: rbac.authorization.k8s.io
     kind: ClusterRole
     name: tenant
   subjects:
   - kind: ServiceAccount
     name: tenant
     namespace: tenant-name
6. Create resource (wearing tenant hat, kubectl --as system:serviceaccount:tenant-name:tenant -n tenant-name)

   apiVersion: api.scs.community/v1alpha1
   kind: KeypairV2
   metadata:
     name: admin
     namespace: tenant-name
   spec:
     name: admin-keypair
     publicKey: |-
       ssh-rsa ...
   ---
   apiVersion: api.scs.community/v1alpha1
   kind: InstanceV2
   metadata:
     name: testing-vm
     namespace: tenant-name
   spec:
     name: testing-vm
     keyPair: admin-keyPair
     imageName: 'Debian 12'
     flavorName: 'SCS-1V:1:20'
7. Observe creation of resources

Right now, it would be expected to hand out the ServiceAccount token to the actual tenant; When AuthN is done via OIDC (or other means), the ServiceAccount tenant-name/tenant may be dropped and RoleBinding tenant-name/scs-bind may point to an actual user/group.