Template

Cluster scoped resource

apiVersion: tenantoperator.stakater.com/v1alpha1
kind: Template
metadata:
  name: redis
resources:
  helm:
    releaseName: redis
    chart:
      repository:
        name: redis
        repoUrl: https://charts.bitnami.com/bitnami
        version: 0.0.15
    values: |
      redisPort: 6379
---
apiVersion: tenantoperator.stakater.com/v1alpha1
kind: Template
metadata:
  name: networkpolicy
parameters:
  - name: CIDR_IP
    value: "172.17.0.0/16"
resources:
  manifests:
    - kind: NetworkPolicy
      apiVersion: networking.k8s.io/v1
      metadata:
        name: deny-cross-ns-traffic
      spec:
        podSelector:
          matchLabels:
            role: db
        policyTypes:
        - Ingress
        - Egress
        ingress:
        - from:
          - ipBlock:
              cidr: "${{CIDR_IP}}"
              except:
              - 172.17.1.0/24
          - namespaceSelector:
              matchLabels:
                project: myproject
          - podSelector:
              matchLabels:
                role: frontend
          ports:
          - protocol: TCP
            port: 6379
        egress:
        - to:
          - ipBlock:
              cidr: 10.0.0.0/24
          ports:
          - protocol: TCP
            port: 5978
---
apiVersion: tenantoperator.stakater.com/v1alpha1
kind: Template
metadata:
  name: resource-mapping
resources:
  resourceMappings:
    secrets:
      - name: secret-s1
        namespace: namespace-n1
    configMaps:
      - name: configmap-c1
        namespace: namespace-n2

Templates are used to initialize Namespaces, share common resources across namespaces, and map secrets/configmaps from one namespace to other namespaces.

• They either contain one or more Kubernetes manifests, a reference to secrets/configmaps, or a Helm chart.
• They are being tracked by TemplateInstances in each Namespace they are applied to.
• They can contain pre-defined parameters such as ${namespace}/${tenant} or user-defined ${MY_PARAMETER} that can be specified within an TemplateInstance.

Also, you can define custom variables in Template and TemplateInstance . The parameters defined in TemplateInstance are overwritten the values defined in Template .

Manifest Templates: The easiest option to define a Template is by specifying an array of Kubernetes manifests which should be applied when the Template is being instantiated.

Helm Chart Templates: Instead of manifests, a Template can specify a Helm chart that will be installed (using Helm template) when the Template is being instantiated.

Resource Mapping Templates: A template can be used to map secrets and configmaps from one tenant's namespace to another tenant's namespace, or within a tenant's namespace.

Mandatory and Optional Templates

Templates can either be mandatory or optional. By default, all Templates are optional. Cluster Admins can make Templates mandatory by adding them to the spec.templateInstances array within the Tenant configuration. All Templates listed in spec.templateInstances will always be instantiated within every Namespace that is created for the respective Tenant.