Not create rbac roles on k8s cluster that have rbac disabled.

Fixes https://github.com/rook/rook/issues/1221

cluster/charts/rook/templates/deployment.yaml

@@ -23,6 +23,10 @@ spec:
         env:
         - name: ROOK_REPO_PREFIX
           value: {{ .Values.image.prefix }}
+{{- if not .Values.rbacEnable }}
+        - name: RBAC_ENABLED
+          value: "false"
+{{- end }}
         - name: ROOK_LOG_LEVEL
           value: {{ .Values.logLevel }}
         - name: NODE_NAME

cluster/examples/kubernetes/rook-operator.yaml

@@ -123,6 +123,9 @@ spec:
         env:
         - name: ROOK_REPO_PREFIX
           value: rook
+        # To disable RBAC, uncomment the following:
+        # - name: RBAC_ENABLED
+        #  value: "false"
         # The interval to check if every mon is in the quorum.
         - name: ROOK_MON_HEALTHCHECK_INTERVAL
           value: "45s"

pkg/operator/k8sutil/rbac.go

@@ -22,6 +22,7 @@ package k8sutil
 
 import (
 	"fmt"
+	"os"
 
 	"k8s.io/api/core/v1"
 	"k8s.io/api/rbac/v1beta1"
@@ -30,6 +31,10 @@ import (
 	"k8s.io/client-go/kubernetes"
 )
 
+const (
+	enableRBACEnv = "RBAC_ENABLED"
+)
+
 func MakeRole(clientset kubernetes.Interface, namespace, name string, rules []v1beta1.PolicyRule) error {
 
 	err := makeServiceAccount(clientset, namespace, name)
@@ -37,6 +42,10 @@ func MakeRole(clientset kubernetes.Interface, namespace, name string, rules []v1
 		return err
 	}
 
+	if !isRBACEnabled() {
+		return nil
+	}
+
 	// Create the role if it doesn't yet exist.
 	// If the role already exists we have to update it. Otherwise if the permissions change during an upgrade,
 	// the create will fail with an error that we're changing the permissions.
@@ -72,6 +81,10 @@ func MakeClusterRole(clientset kubernetes.Interface, namespace, name string, rul
 		return err
 	}
 
+	if !isRBACEnabled() {
+		return nil
+	}
+
 	// Create the cluster scoped role if it doesn't yet exist.
 	// If the role already exists we have to update it. Otherwise if the permissions change during an upgrade,
 	// the create will fail with an error that we're changing the permissions.
@@ -110,3 +123,11 @@ func makeServiceAccount(clientset kubernetes.Interface, namespace, name string)
 	}
 	return nil
 }
+
+func isRBACEnabled() bool {
+	r := os.Getenv(enableRBACEnv)
+	if r == "false" {
+		return false
+	}
+	return true
+}

pkg/operator/k8sutil/rbac_test.go

@@ -21,11 +21,13 @@ which also has the apache 2.0 license.
 package k8sutil
 
 import (
+	"os"
 	"testing"
 
 	"github.com/rook/rook/pkg/operator/test"
 	"github.com/stretchr/testify/assert"
 	"k8s.io/api/rbac/v1beta1"
+	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
@@ -146,3 +148,83 @@ func TestMakeClusterRole(t *testing.T) {
 	assert.Equal(t, 1, len(role.Rules[0].Resources))
 	assert.Equal(t, 2, len(role.Rules[0].Verbs))
 }
+
+func TestMakeRoleRBACDisabled(t *testing.T) {
+	os.Setenv(enableRBACEnv, "false")
+	defer os.Unsetenv(enableRBACEnv)
+	clientset := test.New(1)
+	namespace := "myns"
+	name := "myapp"
+
+	rules := []v1beta1.PolicyRule{
+		{
+			APIGroups: []string{""},
+			Resources: []string{"namespaces", "secrets", "pods", "services", "nodes", "configmaps", "events"},
+			Verbs:     []string{"get", "list", "watch", "create", "update"},
+		},
+		{
+			APIGroups: []string{"extensions"},
+			Resources: []string{"thirdpartyresources", "deployments", "daemonsets", "replicasets"},
+			Verbs:     []string{"get", "list", "create", "delete"},
+		},
+		{
+			APIGroups: []string{"apiextensions.k8s.io"},
+			Resources: []string{"customresourcedefinitions"},
+			Verbs:     []string{"get", "list", "create"},
+		},
+		{
+			APIGroups: []string{"storage.k8s.io"},
+			Resources: []string{"storageclasses"},
+			Verbs:     []string{"get", "list"},
+		},
+	}
+
+	err := MakeRole(clientset, namespace, name, rules)
+
+	_, err = clientset.RbacV1beta1().Roles(namespace).Get(name, metav1.GetOptions{})
+	assert.NotNil(t, err)
+	assert.True(t, errors.IsNotFound(err))
+
+	account, err := clientset.CoreV1().ServiceAccounts(namespace).Get(name, metav1.GetOptions{})
+	assert.Nil(t, err)
+	assert.Equal(t, namespace, account.Namespace)
+
+	_, err = clientset.RbacV1beta1().RoleBindings(namespace).Get(name, metav1.GetOptions{})
+	assert.NotNil(t, err)
+	assert.True(t, errors.IsNotFound(err))
+}
+
+func TestMakeClusterRoleRBACDisabled(t *testing.T) {
+	os.Setenv(enableRBACEnv, "false")
+	defer os.Unsetenv(enableRBACEnv)
+	clientset := test.New(1)
+	namespace := "myns"
+	name := "myapp"
+
+	rules := []v1beta1.PolicyRule{
+		{
+			APIGroups: []string{""},
+			Resources: []string{"pods", "secrets", "configmaps", "persistentvolumes", "nodes/proxy"},
+			Verbs:     []string{"get", "list"},
+		},
+		{
+			APIGroups: []string{"storage.k8s.io"},
+			Resources: []string{"storageclasses"},
+			Verbs:     []string{"get"},
+		},
+	}
+
+	err := MakeClusterRole(clientset, namespace, name, rules)
+	assert.Nil(t, err)
+	_, err = clientset.RbacV1beta1().ClusterRoles().Get(name, metav1.GetOptions{})
+	assert.NotNil(t, err)
+	assert.True(t, errors.IsNotFound(err))
+
+	account, err := clientset.CoreV1().ServiceAccounts(namespace).Get(name, metav1.GetOptions{})
+	assert.Nil(t, err)
+	assert.Equal(t, namespace, account.Namespace)
+
+	_, err = clientset.RbacV1beta1().ClusterRoleBindings().Get(name, metav1.GetOptions{})
+	assert.NotNil(t, err)
+	assert.True(t, errors.IsNotFound(err))
+}