policy-nginx-deployment-templatized.yaml

# This sample policy demonstrates configuring a nginx pod on managedclusters with the configuration customized to the target cluster using managedcluster templates

# In the below policy, 
# container image tag is dynamically set based on the ocp version of  the target cluster using  the fromclusterclaim template
# a couple of example env-variables on the container are also dyanmically set from values of a Secret resource on the target managedcluster using fromSecret template

apiVersion: policy.open-cluster-management.io/v1
kind: Policy
metadata:
  name: policy-nginx-deployment-templatized
  annotations:
    policy.open-cluster-management.io/standards: NIST 800-53
    policy.open-cluster-management.io/categories: CM Configuration Management
    policy.open-cluster-management.io/controls: CM-2 Baseline Configuration
spec:
  remediationAction: inform
  disabled: false
  policy-templates:
    - objectDefinition:
        apiVersion: policy.open-cluster-management.io/v1
        kind: ConfigurationPolicy
        metadata:
          name: policy-nginx-deployment
        spec:
          remediationAction: inform
          severity: low
          namespaceSelector:
            exclude:
              - kube-*
            include:
              - default
          object-templates:
            - complianceType: musthave
              objectDefinition:
                apiVersion: apps/v1
                kind: Deployment
                metadata:
                  name: nginx-deployment-templatized
                  labels:
                    app: nginx
                spec:
                  replicas: '{{ if eq (fromClusterClaim "env") "prod" }} {{ 3 | toInt }} {{ else }} {{ 1  | toInt }} {{ end }}'
                  selector:
                    matchLabels:
                      app: nginx
                  template:
                    metadata:
                      labels:
                        app: nginx
                    spec:
                      containers:
                        - name: nginx
                          #if ocpversion is 4.9 set nginx version to  1.21.4 else 1.20.2
                          image: '{{- if eq (fromClusterClaim "version.openshift.io") "4.9.13" -}} nginx:1.21.4 {{- else -}} nginx:1.20.2 {{- end -}}'
                          ports:
                            - containerPort: 80
                          env: # tls key and crt to communicate to hub are dynamically set
                          - name: hub.tls.crt
                            value: '{{- fromSecret "open-cluster-management-agent" "hub-kubeconfig-secret" "tls.crt" | base64dec -}}'
                          - name: hub.tls.key
                            value: '{{- fromSecret "open-cluster-management-agent" "hub-kubeconfig-secret" "tls.key" | base64dec -}}'
---
apiVersion: policy.open-cluster-management.io/v1
kind: PlacementBinding
metadata:
  name: binding-policy-nginx-deployment-templatized
placementRef:
  name: placement-policy-nginx-deployment-templatized
  kind: PlacementRule
  apiGroup: apps.open-cluster-management.io
subjects:
- name: policy-nginx-deployment-templatized
  kind: Policy
  apiGroup: policy.open-cluster-management.io
---
apiVersion: apps.open-cluster-management.io/v1
kind: PlacementRule
metadata:
  name: placement-policy-nginx-deployment-templatized
spec:
  clusterConditions:
  - status: "True"
    type: ManagedClusterConditionAvailable
  clusterSelector:
    matchExpressions:
      - {key: vendor, operator: In, values: ["OpenShift"]}