Enable Kubernetes RBAC for GitLab Managed Apps for existing clusters

app/controllers/projects/clusters_controller.rb

@@ -157,7 +157,8 @@ class Projects::ClustersController < Projects::ApplicationController
         :namespace,
         :api_url,
         :token,
-        :ca_cert
+        :ca_cert,
+        :authorization_type
       ]).merge(
         provider_type: :user,
         platform_type: :kubernetes

app/helpers/clusters_helper.rb

@@ -11,4 +11,8 @@ module ClustersHelper
       render 'projects/clusters/gcp_signup_offer_banner'
     end
   end
+
+  def rbac_clusters_feature_enabled?
+    Feature.enabled?(:rbac_clusters)
+  end
 end

app/models/clusters/applications/helm.rb

@@ -32,7 +32,8 @@ module Clusters
       def install_command
         Gitlab::Kubernetes::Helm::InitCommand.new(
           name: name,
-          files: files
+          files: files,
+          rbac: cluster.platform_kubernetes_rbac?
         )
       end
 

app/models/clusters/applications/ingress.rb

@@ -39,6 +39,7 @@ module Clusters
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: name,
           version: VERSION,
+          rbac: cluster.platform_kubernetes_rbac?,
           chart: chart,
           files: files
         )

app/models/clusters/applications/jupyter.rb

@@ -40,6 +40,7 @@ module Clusters
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: name,
           version: VERSION,
+          rbac: cluster.platform_kubernetes_rbac?,
           chart: chart,
           files: files,
           repository: repository

app/models/clusters/applications/prometheus.rb

@@ -48,6 +48,7 @@ module Clusters
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: name,
           version: VERSION,
+          rbac: cluster.platform_kubernetes_rbac?,
           chart: chart,
           files: files
         )
@@ -71,7 +72,7 @@ module Clusters
       private
 
       def kube_client
-        cluster&.kubeclient
+        cluster&.kubeclient&.core_client
       end
     end
   end

app/models/clusters/applications/runner.rb

@@ -33,6 +33,7 @@ module Clusters
         Gitlab::Kubernetes::Helm::InstallCommand.new(
           name: name,
           version: VERSION,
+          rbac: cluster.platform_kubernetes_rbac?,
           chart: chart,
           files: files,
           repository: repository

app/models/clusters/cluster.rb

@@ -42,6 +42,7 @@ module Clusters
     delegate :on_creation?, to: :provider, allow_nil: true
 
     delegate :active?, to: :platform_kubernetes, prefix: true, allow_nil: true
+    delegate :rbac?, to: :platform_kubernetes, prefix: true, allow_nil: true
     delegate :installed?, to: :application_helm, prefix: true, allow_nil: true
     delegate :installed?, to: :application_ingress, prefix: true, allow_nil: true
 

app/models/clusters/platforms/kubernetes.rb

@@ -5,6 +5,7 @@ module Clusters
     class Kubernetes < ActiveRecord::Base
       include Gitlab::Kubernetes
       include ReactiveCaching
+      include EnumWithNil
 
       self.table_name = 'cluster_platforms_kubernetes'
       self.reactive_cache_key = ->(kubernetes) { [kubernetes.class.model_name.singular, kubernetes.id] }
@@ -47,6 +48,12 @@ module Clusters
 
       alias_method :active?, :enabled?
 
+      enum_with_nil authorization_type: {
+        unknown_authorization: nil,
+        rbac: 1,
+        abac: 2
+      }
+
       def actual_namespace
         if namespace.present?
           namespace
@@ -95,7 +102,7 @@ module Clusters
       end
 
       def kubeclient
-        @kubeclient ||= build_kubeclient!
+        @kubeclient ||= build_kube_client!(api_groups: ['api', 'apis/rbac.authorization.k8s.io'])
       end
 
       private
@@ -115,15 +122,16 @@ module Clusters
         slug.gsub(/[^-a-z0-9]/, '-').gsub(/^-+/, '')
       end
 
-      def build_kubeclient!(api_path: 'api', api_version: 'v1')
+      def build_kube_client!(api_groups: ['api'], api_version: 'v1')
         raise "Incomplete settings" unless api_url && actual_namespace
 
         unless (username && password) || token
           raise "Either username/password or token is required to access API"
         end
 
-        ::Kubeclient::Client.new(
-          join_api_url(api_path),
+        Gitlab::Kubernetes::KubeClient.new(
+          api_url,
+          api_groups,
           api_version,
           auth_options: kubeclient_auth_options,
           ssl_options: kubeclient_ssl_options,
@@ -133,7 +141,7 @@ module Clusters
 
       # Returns a hash of all pods in the namespace
       def read_pods
-        kubeclient = build_kubeclient!
+        kubeclient = build_kube_client!
 
         kubeclient.get_pods(namespace: actual_namespace).as_json
       rescue Kubeclient::HttpError => err
@@ -157,15 +165,6 @@ module Clusters
         { bearer_token: token }
       end
 
-      def join_api_url(api_path)
-        url = URI.parse(api_url)
-        prefix = url.path.sub(%r{/+\z}, '')
-
-        url.path = [prefix, api_path].join("/")
-
-        url.to_s
-      end
-
       def terminal_auth
         {
           token: token,

app/models/project_services/kubernetes_service.rb

@@ -96,10 +96,10 @@ class KubernetesService < DeploymentService
 
   # Check we can connect to the Kubernetes API
   def test(*args)
-    kubeclient = build_kubeclient!
+    kubeclient = build_kube_client!
 
-    kubeclient.discover
-    { success: kubeclient.discovered, result: "Checked API discovery endpoint" }
+    kubeclient.core_client.discover
+    { success: kubeclient.core_client.discovered, result: "Checked API discovery endpoint" }
   rescue => err
     { success: false, result: err }
   end
@@ -144,7 +144,7 @@ class KubernetesService < DeploymentService
   end
 
   def kubeclient
-    @kubeclient ||= build_kubeclient!
+    @kubeclient ||= build_kube_client!(api_groups: ['api', 'apis/rbac.authorization.k8s.io'])
   end
 
   def deprecated?
@@ -182,11 +182,12 @@ class KubernetesService < DeploymentService
     slug.gsub(/[^-a-z0-9]/, '-').gsub(/^-+/, '')
   end
 
-  def build_kubeclient!(api_path: 'api', api_version: 'v1')
+  def build_kube_client!(api_groups: ['api'], api_version: 'v1')
     raise "Incomplete settings" unless api_url && actual_namespace && token
 
-    ::Kubeclient::Client.new(
-      join_api_url(api_path),
+    Gitlab::Kubernetes::KubeClient.new(
+      api_url,
+      api_groups,
       api_version,
       auth_options: kubeclient_auth_options,
       ssl_options: kubeclient_ssl_options,
@@ -196,7 +197,7 @@ class KubernetesService < DeploymentService
 
   # Returns a hash of all pods in the namespace
   def read_pods
-    kubeclient = build_kubeclient!
+    kubeclient = build_kube_client!
 
     kubeclient.get_pods(namespace: actual_namespace).as_json
   rescue Kubeclient::HttpError => err
@@ -220,15 +221,6 @@ class KubernetesService < DeploymentService
     { bearer_token: token }
   end
 
-  def join_api_url(api_path)
-    url = URI.parse(api_url)
-    prefix = url.path.sub(%r{/+\z}, '')
-
-    url.path = [prefix, api_path].join("/")
-
-    url.to_s
-  end
-
   def terminal_auth
     {
       token: token,

app/views/projects/clusters/user/_form.html.haml

@@ -25,5 +25,14 @@
       = platform_kubernetes_field.label :namespace, s_('ClusterIntegration|Project namespace (optional, unique)'), class: 'label-bold'
       = platform_kubernetes_field.text_field :namespace, class: 'form-control', placeholder: s_('ClusterIntegration|Project namespace')
 
+    - if rbac_clusters_feature_enabled?
+      .form-group
+        .form-check
+          = platform_kubernetes_field.check_box :authorization_type, { class: 'form-check-input' }, 'rbac', 'abac'
+          = platform_kubernetes_field.label :authorization_type, s_('ClusterIntegration|RBAC-enabled cluster (experimental)'), class: 'form-check-label label-bold'
+          .form-text.text-muted
+            = s_('ClusterIntegration|Enable this setting if using role-based access control (RBAC).')
+            = s_('ClusterIntegration|This option will allow you to install applications on RBAC clusters.')
+
     .form-group
       = field.submit s_('ClusterIntegration|Add Kubernetes cluster'), class: 'btn btn-success'

app/views/projects/clusters/user/_show.html.haml

@@ -26,5 +26,14 @@
       = platform_kubernetes_field.label :namespace, s_('ClusterIntegration|Project namespace (optional, unique)'), class: 'label-bold'
       = platform_kubernetes_field.text_field :namespace, class: 'form-control', placeholder: s_('ClusterIntegration|Project namespace')
 
+    - if rbac_clusters_feature_enabled?
+      .form-group
+        .form-check
+          = platform_kubernetes_field.check_box :authorization_type, { class: 'form-check-input', disabled: true }, 'rbac', 'abac'
+          = platform_kubernetes_field.label :authorization_type, s_('ClusterIntegration|RBAC-enabled cluster (experimental)'), class: 'form-check-label label-bold'
+          .form-text.text-muted
+            = s_('ClusterIntegration|Enable this setting if using role-based access control (RBAC).')
+            = s_('ClusterIntegration|This option will allow you to install applications on RBAC clusters.')
+
     .form-group
       = field.submit s_('ClusterIntegration|Save changes'), class: 'btn btn-success'

changelogs/unreleased/29398-support-kubernetes-rbac-for-gitlab-managed-apps.yml

+---
+title: Support Kubernetes RBAC for GitLab Managed Apps when adding a existing cluster
+merge_request: 21127
+author:
+type: changed

db/migrate/20180815040323_add_authorization_type_to_cluster_platforms_kubernetes.rb

+# frozen_string_literal: true
+
+class AddAuthorizationTypeToClusterPlatformsKubernetes < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    add_column :cluster_platforms_kubernetes, :authorization_type, :integer, limit: 2
+  end
+end

db/schema.rb

@@ -588,6 +588,7 @@ ActiveRecord::Schema.define(version: 20180826111825) do
     t.string "encrypted_password_iv"
     t.text "encrypted_token"
     t.string "encrypted_token_iv"
+    t.integer "authorization_type", limit: 2
   end
 
   add_index "cluster_platforms_kubernetes", ["cluster_id"], name: "index_cluster_platforms_kubernetes_on_cluster_id", unique: true, using: :btree

lib/gitlab/kubernetes/cluster_role_binding.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Kubernetes
+    class ClusterRoleBinding
+      attr_reader :name, :cluster_role_name, :subjects
+
+      def initialize(name, cluster_role_name, subjects)
+        @name = name
+        @cluster_role_name = cluster_role_name
+        @subjects = subjects
+      end
+
+      def generate
+        ::Kubeclient::Resource.new.tap do |resource|
+          resource.metadata = metadata
+          resource.roleRef = role_ref
+          resource.subjects = subjects
+        end
+      end
+
+      private
+
+      def metadata
+        { name: name }
+      end
+
+      def role_ref
+        {
+          apiGroup: 'rbac.authorization.k8s.io',
+          kind: 'ClusterRole',
+          name: cluster_role_name
+        }
+      end
+    end
+  end
+end

lib/gitlab/kubernetes/helm.rb

@@ -3,6 +3,9 @@ module Gitlab
     module Helm
       HELM_VERSION = '2.7.2'.freeze
       NAMESPACE = 'gitlab-managed-apps'.freeze
+      SERVICE_ACCOUNT = 'tiller'.freeze
+      CLUSTER_ROLE_BINDING = 'tiller-admin'.freeze
+      CLUSTER_ROLE = 'cluster-admin'.freeze
     end
   end
 end

lib/gitlab/kubernetes/helm/api.rb

@@ -9,7 +9,11 @@ module Gitlab
 
         def install(command)
           namespace.ensure_exists!
+
+          create_service_account(command)
+          create_cluster_role_binding(command)
           create_config_map(command)
+
           kubeclient.create_pod(command.pod_resource)
         end
 
@@ -41,6 +45,50 @@ module Gitlab
             kubeclient.create_config_map(config_map_resource)
           end
         end
+
+        def create_service_account(command)
+          command.service_account_resource.tap do |service_account_resource|
+            break unless service_account_resource
+
+            if service_account_exists?(service_account_resource)
+              kubeclient.update_service_account(service_account_resource)
+            else
+              kubeclient.create_service_account(service_account_resource)
+            end
+          end
+        end
+
+        def create_cluster_role_binding(command)
+          command.cluster_role_binding_resource.tap do |cluster_role_binding_resource|
+            break unless cluster_role_binding_resource
+
+            if cluster_role_binding_exists?(cluster_role_binding_resource)
+              kubeclient.update_cluster_role_binding(cluster_role_binding_resource)
+            else
+              kubeclient.create_cluster_role_binding(cluster_role_binding_resource)
+            end
+          end
+        end
+
+        def service_account_exists?(resource)
+          resource_exists? do
+            kubeclient.get_service_account(resource.metadata.name, resource.metadata.namespace)
+          end
+        end
+
+        def cluster_role_binding_exists?(resource)
+          resource_exists? do
+            kubeclient.get_cluster_role_binding(resource.metadata.name)
+          end
+        end
+
+        def resource_exists?
+          yield
+        rescue ::Kubeclient::HttpError => e
+          raise e unless e.error_code == 404
+
+          false
+        end
       end
     end
   end

lib/gitlab/kubernetes/helm/base_command.rb

@@ -3,7 +3,9 @@ module Gitlab
     module Helm
       module BaseCommand
         def pod_resource
-          Gitlab::Kubernetes::Helm::Pod.new(self, namespace).generate
+          pod_service_account_name = rbac? ? service_account_name : nil
+
+          Gitlab::Kubernetes::Helm::Pod.new(self, namespace, service_account_name: pod_service_account_name).generate
         end
 
         def generate_script
@@ -26,6 +28,14 @@ module Gitlab
           Gitlab::Kubernetes::ConfigMap.new(name, files).generate
         end
 
+        def service_account_resource
+          nil
+        end
+
+        def cluster_role_binding_resource
+          nil
+        end
+
         def file_names
           files.keys
         end
@@ -34,6 +44,10 @@ module Gitlab
           raise "Not implemented"
         end
 
+        def rbac?
+          raise "Not implemented"
+        end
+
         def files
           raise "Not implemented"
         end
@@ -47,6 +61,10 @@ module Gitlab
         def namespace
           Gitlab::Kubernetes::Helm::NAMESPACE
         end
+
+        def service_account_name
+          Gitlab::Kubernetes::Helm::SERVICE_ACCOUNT
+        end
       end
     end
   end

lib/gitlab/kubernetes/helm/init_command.rb

@@ -6,9 +6,10 @@ module Gitlab
 
         attr_reader :name, :files
 
-        def initialize(name:, files:)
+        def initialize(name:, files:, rbac:)
           @name = name
           @files = files
+          @rbac = rbac
         end
 
         def generate_script
@@ -17,15 +18,62 @@ module Gitlab
           ].join("\n")
         end
 
+        def rbac?
+          @rbac
+        end
+
+        def service_account_resource
+          return unless rbac?
+
+          Gitlab::Kubernetes::ServiceAccount.new(service_account_name, namespace).generate
+        end
+
+        def cluster_role_binding_resource
+          return unless rbac?
+
+          subjects = [{ kind: 'ServiceAccount', name: service_account_name, namespace: namespace }]
+
+          Gitlab::Kubernetes::ClusterRoleBinding.new(
+            cluster_role_binding_name,
+            cluster_role_name,
+            subjects
+          ).generate
+        end
+
         private
 
         def init_helm_command
-          tls_flags = "--tiller-tls" \
-            " --tiller-tls-verify --tls-ca-cert #{files_dir}/ca.pem" \
-            " --tiller-tls-cert #{files_dir}/cert.pem" \
-            " --tiller-tls-key #{files_dir}/key.pem"
+          command = %w[helm init] + init_command_flags
+
+          command.shelljoin + " >/dev/null\n"
+        end
+
+        def init_command_flags
+          tls_flags + optional_service_account_flag
+        end
+
+        def tls_flags
+          [
+            '--tiller-tls',
+            '--tiller-tls-verify',
+            '--tls-ca-cert', "#{files_dir}/ca.pem",
+            '--tiller-tls-cert', "#{files_dir}/cert.pem",
+            '--tiller-tls-key', "#{files_dir}/key.pem"
+          ]
+        end
+
+        def optional_service_account_flag
+          return [] unless rbac?
+
+          ['--service-account', service_account_name]
+        end
+
+        def cluster_role_binding_name
+          Gitlab::Kubernetes::Helm::CLUSTER_ROLE_BINDING
+        end
 
-          "helm init #{tls_flags} >/dev/null"
+        def cluster_role_name
+          Gitlab::Kubernetes::Helm::CLUSTER_ROLE
         end
       end
     end

lib/gitlab/kubernetes/helm/install_command.rb

@@ -6,10 +6,11 @@ module Gitlab
 
         attr_reader :name, :files, :chart, :version, :repository
 
-        def initialize(name:, chart:, files:, version: nil, repository: nil)
+        def initialize(name:, chart:, files:, rbac:, version: nil, repository: nil)
           @name = name
           @chart = chart
           @version = version
+          @rbac = rbac
           @files = files
           @repository = repository
         end
@@ -22,6 +23,10 @@ module Gitlab
           ].compact.join("\n")
         end
 
+        def rbac?
+          @rbac
+        end
+
         private
 
         def init_command
@@ -29,28 +34,51 @@ module Gitlab
         end
 
         def repository_command
-          "helm repo add #{name} #{repository}" if repository
+          ['helm', 'repo', 'add', name, repository].shelljoin if repository
         end
 
         def script_command
-          init_flags = "--name #{name}#{optional_tls_flags}#{optional_version_flag}" \
-            " --namespace #{Gitlab::Kubernetes::Helm::NAMESPACE}" \
-            " -f /data/helm/#{name}/config/values.yaml"
+          command = ['helm', 'install', chart] + install_command_flags
+
+          command.shelljoin + " >/dev/null\n"
+        end
+
+        def install_command_flags
+          name_flag      = ['--name', name]
+          namespace_flag = ['--namespace', Gitlab::Kubernetes::Helm::NAMESPACE]
+          value_flag     = ['-f', "/data/helm/#{name}/config/values.yaml"]
 
-          "helm install #{chart} #{init_flags} >/dev/null\n"
+          name_flag +
+            optional_tls_flags +
+            optional_version_flag +
+            optional_rbac_create_flag +
+            namespace_flag +
+            value_flag
+        end
+
+        def optional_rbac_create_flag
+          return [] unless rbac?
+
+          # jupyterhub helm chart is using rbac.enabled
+          #   https://github.com/jupyterhub/zero-to-jupyterhub-k8s/tree/master/jupyterhub
+          %w[--set rbac.create=true,rbac.enabled=true]
         end
 
         def optional_version_flag
-          " --version #{version}" if version
+          return [] unless version
+
+          ['--version', version]
         end
 
         def optional_tls_flags
-          return unless files.key?(:'ca.pem')
+          return [] unless files.key?(:'ca.pem')
 
-          " --tls" \
-            " --tls-ca-cert #{files_dir}/ca.pem" \
-            " --tls-cert #{files_dir}/cert.pem" \
-            " --tls-key #{files_dir}/key.pem"
+          [
+            '--tls',
+            '--tls-ca-cert', "#{files_dir}/ca.pem",
+            '--tls-cert', "#{files_dir}/cert.pem",
+            '--tls-key', "#{files_dir}/key.pem"
+          ]
         end
       end
     end

lib/gitlab/kubernetes/helm/pod.rb

@@ -2,9 +2,10 @@ module Gitlab
   module Kubernetes
     module Helm
       class Pod
-        def initialize(command, namespace_name)
+        def initialize(command, namespace_name, service_account_name: nil)
           @command = command
           @namespace_name = namespace_name
+          @service_account_name = service_account_name
         end
 
         def generate
@@ -12,13 +13,14 @@ module Gitlab
 
           spec[:volumes] = volumes_specification
           spec[:containers][0][:volumeMounts] = volume_mounts_specification
+          spec[:serviceAccountName] = service_account_name if service_account_name
 
           ::Kubeclient::Resource.new(metadata: metadata, spec: spec)
         end
 
         private
 
-        attr_reader :command, :namespace_name, :kubeclient, :config_map
+        attr_reader :command, :namespace_name, :service_account_name
 
         def container_specification
           {

lib/gitlab/kubernetes/kube_client.rb

+# frozen_string_literal: true
+
+require 'uri'
+
+module Gitlab
+  module Kubernetes
+    # Wrapper around Kubeclient::Client to dispatch
+    # the right message to the client that can respond to the message.
+    # We must have a kubeclient for each ApiGroup as there is no
+    # other way to use the Kubeclient gem.
+    #
+    # See https://github.com/abonas/kubeclient/issues/348.
+    class KubeClient
+      include Gitlab::Utils::StrongMemoize
+
+      SUPPORTED_API_GROUPS = [
+        'api',
+        'apis/rbac.authorization.k8s.io',
+        'apis/extensions'
+      ].freeze
+
+      # Core API methods delegates to the core api group client
+      delegate :get_pods,
+        :get_secrets,
+        :get_config_map,
+        :get_namespace,
+        :get_pod,
+        :get_service,
+        :get_service_account,
+        :delete_pod,
+        :create_config_map,
+        :create_namespace,
+        :create_pod,
+        :create_service_account,
+        :update_config_map,
+        :update_service_account,
+        to: :core_client
+
+      # RBAC methods delegates to the apis/rbac.authorization.k8s.io api
+      # group client
+      delegate :create_cluster_role_binding,
+        :get_cluster_role_binding,
+        :update_cluster_role_binding,
+        to: :rbac_client
+
+      # Deployments resource is currently on the apis/extensions api group
+      delegate :get_deployments,
+        to: :extensions_client
+
+      # non-entity methods that can only work with the core client
+      # as it uses the pods/log resource
+      delegate :get_pod_log,
+        :watch_pod_log,
+        to: :core_client
+
+      def initialize(api_prefix, api_groups = ['api'], api_version = 'v1', **kubeclient_options)
+        raise ArgumentError unless check_api_groups_supported?(api_groups)
+
+        @api_prefix = api_prefix
+        @api_groups = api_groups
+        @api_version = api_version
+        @kubeclient_options = kubeclient_options
+      end
+
+      def discover!
+        clients.each(&:discover)
+      end
+
+      def clients
+        hashed_clients.values
+      end
+
+      def core_client
+        hashed_clients['api']
+      end
+
+      def rbac_client
+        hashed_clients['apis/rbac.authorization.k8s.io']
+      end
+
+      def extensions_client
+        hashed_clients['apis/extensions']
+      end
+
+      def hashed_clients
+        strong_memoize(:hashed_clients) do
+          @api_groups.map do |api_group|
+            api_url = join_api_url(@api_prefix, api_group)
+            [api_group, ::Kubeclient::Client.new(api_url, @api_version, **@kubeclient_options)]
+          end.to_h
+        end
+      end
+
+      private
+
+      def check_api_groups_supported?(api_groups)
+        api_groups.all? {|api_group| SUPPORTED_API_GROUPS.include?(api_group) }
+      end
+
+      def join_api_url(api_prefix, api_path)
+        url = URI.parse(api_prefix)
+        prefix = url.path.sub(%r{/+\z}, '')
+
+        url.path = [prefix, api_path].join("/")
+
+        url.to_s
+      end
+    end
+  end
+end

lib/gitlab/kubernetes/service_account.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Kubernetes
+    class ServiceAccount
+      attr_reader :name, :namespace_name
+
+      def initialize(name, namespace_name)
+        @name = name
+        @namespace_name = namespace_name
+      end
+
+      def generate
+        ::Kubeclient::Resource.new(metadata: metadata)
+      end
+
+      private
+
+      def metadata
+        {
+          name: name,
+          namespace: namespace_name
+        }
+      end
+    end
+  end
+end

locale/gitlab.pot

@@ -1359,6 +1359,9 @@ msgstr ""
 msgid "ClusterIntegration|Did you know?"
 msgstr ""
 
+msgid "ClusterIntegration|Enable this setting if using role-based access control (RBAC)."
+msgstr ""
+
 msgid "ClusterIntegration|Enter the details for your Kubernetes cluster"
 msgstr ""
 
@@ -1542,6 +1545,9 @@ msgstr ""
 msgid "ClusterIntegration|Prometheus is an open-source monitoring system with %{gitlabIntegrationLink} to monitor deployed applications."
 msgstr ""
 
+msgid "ClusterIntegration|RBAC-enabled cluster (experimental)"
+msgstr ""
+
 msgid "ClusterIntegration|Read our %{link_to_help_page} on Kubernetes cluster integration."
 msgstr ""
 
@@ -1620,6 +1626,9 @@ msgstr ""
 msgid "ClusterIntegration|This account must have permissions to create a Kubernetes cluster in the %{link_to_container_project} specified below"
 msgstr ""
 
+msgid "ClusterIntegration|This option will allow you to install applications on RBAC clusters."
+msgstr ""
+
 msgid "ClusterIntegration|Toggle Kubernetes Cluster"
 msgstr ""
 

spec/controllers/projects/clusters_controller_spec.rb

@@ -274,11 +274,43 @@ describe Projects::ClustersController do
       context 'when creates a cluster' do
         it 'creates a new cluster' do
           expect(ClusterProvisionWorker).to receive(:perform_async)
+
+          expect { go }.to change { Clusters::Cluster.count }
+            .and change { Clusters::Platforms::Kubernetes.count }
+
+          expect(response).to redirect_to(project_cluster_path(project, project.clusters.first))
+
+          expect(project.clusters.first).to be_user
+          expect(project.clusters.first).to be_kubernetes
+        end
+      end
+
+      context 'when creates a RBAC-enabled cluster' do
+        let(:params) do
+          {
+            cluster: {
+              name: 'new-cluster',
+              platform_kubernetes_attributes: {
+                api_url: 'http://my-url',
+                token: 'test',
+                namespace: 'aaa',
+                authorization_type: 'rbac'
+              }
+            }
+          }
+        end
+
+        it 'creates a new cluster' do
+          expect(ClusterProvisionWorker).to receive(:perform_async)
+
           expect { go }.to change { Clusters::Cluster.count }
             .and change { Clusters::Platforms::Kubernetes.count }
+
           expect(response).to redirect_to(project_cluster_path(project, project.clusters.first))
+
           expect(project.clusters.first).to be_user
           expect(project.clusters.first).to be_kubernetes
+          expect(project.clusters.first).to be_platform_kubernetes_rbac
         end
       end
     end

spec/factories/clusters/platforms/kubernetes.rb

@@ -16,5 +16,9 @@ FactoryBot.define do
         platform_kubernetes.ca_cert = File.read(pem_file)
       end
     end
+
+    trait :rbac_enabled do
+      authorization_type :rbac
+    end
   end
 end

spec/features/projects/clusters/user_spec.rb

@@ -38,6 +38,28 @@ describe 'User Cluster', :js do
       end
     end
 
+    context 'rbac_clusters feature flag is enabled' do
+      before do
+        stub_feature_flags(rbac_clusters: true)
+
+        fill_in 'cluster_name', with: 'dev-cluster'
+        fill_in 'cluster_platform_kubernetes_attributes_api_url', with: 'http://example.com'
+        fill_in 'cluster_platform_kubernetes_attributes_token', with: 'my-token'
+        check 'cluster_platform_kubernetes_attributes_authorization_type'
+        click_button 'Add Kubernetes cluster'
+      end
+
+      it 'user sees a cluster details page' do
+        expect(page).to have_content('Kubernetes cluster integration')
+        expect(page.find_field('cluster[name]').value).to eq('dev-cluster')
+        expect(page.find_field('cluster[platform_kubernetes_attributes][api_url]').value)
+          .to have_content('http://example.com')
+        expect(page.find_field('cluster[platform_kubernetes_attributes][token]').value)
+          .to have_content('my-token')
+        expect(page.find_field('cluster[platform_kubernetes_attributes][authorization_type]', disabled: true)).to be_checked
+      end
+    end
+
     context 'when user filled form with invalid parameters' do
       before do
         click_button 'Add Kubernetes cluster'

spec/lib/gitlab/kubernetes/cluster_role_binding_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Kubernetes::ClusterRoleBinding do
+  let(:cluster_role_binding) { described_class.new(name, cluster_role_name, subjects) }
+  let(:name) { 'cluster-role-binding-name' }
+  let(:cluster_role_name) { 'cluster-admin' }
+
+  let(:subjects) { [{ kind: 'ServiceAccount', name: 'sa', namespace: 'ns' }] }
+
+  describe '#generate' do
+    let(:role_ref) do
+      {
+        apiGroup: 'rbac.authorization.k8s.io',
+        kind: 'ClusterRole',
+        name: cluster_role_name
+      }
+    end
+
+    let(:resource) do
+      ::Kubeclient::Resource.new(
+        metadata: { name: name },
+        roleRef: role_ref,
+        subjects: subjects
+      )
+    end
+
+    subject { cluster_role_binding.generate }
+
+    it 'should build a Kubeclient Resource' do
+      is_expected.to eq(resource)
+    end
+  end
+end

spec/lib/gitlab/kubernetes/helm/api_spec.rb

@@ -5,9 +5,18 @@ describe Gitlab::Kubernetes::Helm::Api do
   let(:helm) { described_class.new(client) }
   let(:gitlab_namespace) { Gitlab::Kubernetes::Helm::NAMESPACE }
   let(:namespace) { Gitlab::Kubernetes::Namespace.new(gitlab_namespace, client) }
-  let(:application) { create(:clusters_applications_prometheus) }
-
-  let(:command) { application.install_command }
+  let(:application_name) { 'app-name' }
+  let(:rbac) { false }
+  let(:files) { {} }
+
+  let(:command) do
+    Gitlab::Kubernetes::Helm::InstallCommand.new(
+      name: application_name,
+      chart: 'chart-name',
+      rbac: rbac,
+      files: files
+    )
+  end
 
   subject { helm }
 
@@ -28,6 +37,8 @@ describe Gitlab::Kubernetes::Helm::Api do
     before do
       allow(client).to receive(:create_pod).and_return(nil)
       allow(client).to receive(:create_config_map).and_return(nil)
+      allow(client).to receive(:create_service_account).and_return(nil)
+      allow(client).to receive(:create_cluster_role_binding).and_return(nil)
       allow(namespace).to receive(:ensure_exists!).once
     end
 
@@ -39,7 +50,7 @@ describe Gitlab::Kubernetes::Helm::Api do
     end
 
     context 'with a ConfigMap' do
-      let(:resource) { Gitlab::Kubernetes::ConfigMap.new(application.name, application.files).generate }
+      let(:resource) { Gitlab::Kubernetes::ConfigMap.new(application_name, files).generate }
 
       it 'creates a ConfigMap on kubeclient' do
         expect(client).to receive(:create_config_map).with(resource).once
@@ -47,6 +58,96 @@ describe Gitlab::Kubernetes::Helm::Api do
         subject.install(command)
       end
     end
+
+    context 'without a service account' do
+      it 'does not create a service account on kubeclient' do
+        expect(client).not_to receive(:create_service_account)
+        expect(client).not_to receive(:create_cluster_role_binding)
+
+        subject.install(command)
+      end
+    end
+
+    context 'with a service account' do
+      let(:command) { Gitlab::Kubernetes::Helm::InitCommand.new(name: application_name, files: files, rbac: rbac) }
+
+      context 'rbac-enabled cluster' do
+        let(:rbac) { true }
+
+        let(:service_account_resource) do
+          Kubeclient::Resource.new(metadata: { name: 'tiller', namespace: 'gitlab-managed-apps' })
+        end
+
+        let(:cluster_role_binding_resource) do
+          Kubeclient::Resource.new(
+            metadata: { name: 'tiller-admin' },
+            roleRef: { apiGroup: 'rbac.authorization.k8s.io', kind: 'ClusterRole', name: 'cluster-admin' },
+            subjects: [{ kind: 'ServiceAccount', name: 'tiller', namespace: 'gitlab-managed-apps' }]
+          )
+        end
+
+        context 'service account and cluster role binding does not exist' do
+          before do
+            expect(client).to receive('get_service_account').with('tiller', 'gitlab-managed-apps').and_raise(Kubeclient::HttpError.new(404, 'Not found', nil))
+            expect(client).to receive('get_cluster_role_binding').with('tiller-admin').and_raise(Kubeclient::HttpError.new(404, 'Not found', nil))
+          end
+
+          it 'creates a service account, followed the cluster role binding on kubeclient' do
+            expect(client).to receive(:create_service_account).with(service_account_resource).once.ordered
+            expect(client).to receive(:create_cluster_role_binding).with(cluster_role_binding_resource).once.ordered
+
+            subject.install(command)
+          end
+        end
+
+        context 'service account already exists' do
+          before do
+            expect(client).to receive('get_service_account').with('tiller', 'gitlab-managed-apps').and_return(service_account_resource)
+            expect(client).to receive('get_cluster_role_binding').with('tiller-admin').and_raise(Kubeclient::HttpError.new(404, 'Not found', nil))
+          end
+
+          it 'updates the service account, followed by creating the cluster role binding' do
+            expect(client).to receive(:update_service_account).with(service_account_resource).once.ordered
+            expect(client).to receive(:create_cluster_role_binding).with(cluster_role_binding_resource).once.ordered
+
+            subject.install(command)
+          end
+        end
+
+        context 'service account and cluster role binding already exists' do
+          before do
+            expect(client).to receive('get_service_account').with('tiller', 'gitlab-managed-apps').and_return(service_account_resource)
+            expect(client).to receive('get_cluster_role_binding').with('tiller-admin').and_return(cluster_role_binding_resource)
+          end
+
+          it 'updates the service account, followed by creating the cluster role binding' do
+            expect(client).to receive(:update_service_account).with(service_account_resource).once.ordered
+            expect(client).to receive(:update_cluster_role_binding).with(cluster_role_binding_resource).once.ordered
+
+            subject.install(command)
+          end
+        end
+
+        context 'a non-404 error is thrown' do
+          before do
+            expect(client).to receive('get_service_account').with('tiller', 'gitlab-managed-apps').and_raise(Kubeclient::HttpError.new(401, 'Unauthorized', nil))
+          end
+
+          it 'raises an error' do
+            expect { subject.install(command) }.to raise_error(Kubeclient::HttpError)
+          end
+        end
+      end
+
+      context 'legacy abac cluster' do
+        it 'does not create a service account on kubeclient' do
+          expect(client).not_to receive(:create_service_account)
+          expect(client).not_to receive(:create_cluster_role_binding)
+
+          subject.install(command)
+        end
+      end
+    end
   end
 
   describe '#status' do

spec/lib/gitlab/kubernetes/helm/base_command_spec.rb

@@ -2,14 +2,24 @@ require 'spec_helper'
 
 describe Gitlab::Kubernetes::Helm::BaseCommand do
   let(:application) { create(:clusters_applications_helm) }
+  let(:rbac) { false }
+
   let(:test_class) do
     Class.new do
       include Gitlab::Kubernetes::Helm::BaseCommand
 
+      def initialize(rbac)
+        @rbac = rbac
+      end
+
       def name
         "test-class-name"
       end
 
+      def rbac?
+        @rbac
+      end
+
       def files
         {
           some: 'value'
@@ -19,7 +29,7 @@ describe Gitlab::Kubernetes::Helm::BaseCommand do
   end
 
   let(:base_command) do
-    test_class.new
+    test_class.new(rbac)
   end
 
   subject { base_command }
@@ -34,6 +44,14 @@ describe Gitlab::Kubernetes::Helm::BaseCommand do
     it 'should returns a kubeclient resoure with pod content for application' do
       is_expected.to be_an_instance_of ::Kubeclient::Resource
     end
+
+    context 'when rbac is true' do
+      let(:rbac) { true }
+
+      it 'also returns a kubeclient resource' do
+        is_expected.to be_an_instance_of ::Kubeclient::Resource
+      end
+    end
   end
 
   describe '#pod_name' do

spec/lib/gitlab/kubernetes/helm/init_command_spec.rb

@@ -2,9 +2,135 @@ require 'spec_helper'
 
 describe Gitlab::Kubernetes::Helm::InitCommand do
   let(:application) { create(:clusters_applications_helm) }
-  let(:commands) { 'helm init --tiller-tls --tiller-tls-verify --tls-ca-cert /data/helm/helm/config/ca.pem --tiller-tls-cert /data/helm/helm/config/cert.pem --tiller-tls-key /data/helm/helm/config/key.pem >/dev/null' }
+  let(:rbac) { false }
+  let(:files) { {} }
+  let(:init_command) { described_class.new(name: application.name, files: files, rbac: rbac) }
 
-  subject { described_class.new(name: application.name, files: {}) }
+  let(:commands) do
+    <<~EOS
+    helm init --tiller-tls --tiller-tls-verify --tls-ca-cert /data/helm/helm/config/ca.pem --tiller-tls-cert /data/helm/helm/config/cert.pem --tiller-tls-key /data/helm/helm/config/key.pem >/dev/null
+    EOS
+  end
+
+  subject { init_command }
 
   it_behaves_like 'helm commands'
+
+  context 'on a rbac-enabled cluster' do
+    let(:rbac) { true }
+
+    it_behaves_like 'helm commands' do
+      let(:commands) do
+        <<~EOS
+        helm init --tiller-tls --tiller-tls-verify --tls-ca-cert /data/helm/helm/config/ca.pem --tiller-tls-cert /data/helm/helm/config/cert.pem --tiller-tls-key /data/helm/helm/config/key.pem --service-account tiller >/dev/null
+        EOS
+      end
+    end
+  end
+
+  describe '#rbac?' do
+    subject { init_command.rbac? }
+
+    context 'rbac is enabled' do
+      let(:rbac) { true }
+
+      it { is_expected.to be_truthy }
+    end
+
+    context 'rbac is not enabled' do
+      let(:rbac) { false }
+
+      it { is_expected.to be_falsey }
+    end
+  end
+
+  describe '#config_map_resource' do
+    let(:metadata) do
+      {
+        name: 'values-content-configuration-helm',
+        namespace: 'gitlab-managed-apps',
+        labels: { name: 'values-content-configuration-helm' }
+      }
+    end
+
+    let(:resource) { ::Kubeclient::Resource.new(metadata: metadata, data: files) }
+
+    subject { init_command.config_map_resource }
+
+    it 'returns a KubeClient resource with config map content for the application' do
+      is_expected.to eq(resource)
+    end
+  end
+
+  describe '#pod_resource' do
+    subject { init_command.pod_resource }
+
+    context 'rbac is enabled' do
+      let(:rbac) { true }
+
+      it 'generates a pod that uses the tiller serviceAccountName' do
+        expect(subject.spec.serviceAccountName).to eq('tiller')
+      end
+    end
+
+    context 'rbac is not enabled' do
+      let(:rbac) { false }
+
+      it 'generates a pod that uses the default serviceAccountName' do
+        expect(subject.spec.serviceAcccountName).to be_nil
+      end
+    end
+  end
+
+  describe '#service_account_resource' do
+    let(:resource) do
+      Kubeclient::Resource.new(metadata: { name: 'tiller', namespace: 'gitlab-managed-apps' })
+    end
+
+    subject { init_command.service_account_resource }
+
+    context 'rbac is enabled' do
+      let(:rbac) { true }
+
+      it 'generates a Kubeclient resource for the tiller ServiceAccount' do
+        is_expected.to eq(resource)
+      end
+    end
+
+    context 'rbac is not enabled' do
+      let(:rbac) { false }
+
+      it 'generates nothing' do
+        is_expected.to be_nil
+      end
+    end
+  end
+
+  describe '#cluster_role_binding_resource' do
+    let(:resource) do
+      Kubeclient::Resource.new(
+        metadata: { name: 'tiller-admin' },
+        roleRef: { apiGroup: 'rbac.authorization.k8s.io', kind: 'ClusterRole', name: 'cluster-admin' },
+        subjects: [{ kind: 'ServiceAccount', name: 'tiller', namespace: 'gitlab-managed-apps' }]
+      )
+    end
+
+    subject { init_command.cluster_role_binding_resource }
+
+    context 'rbac is enabled' do
+      let(:rbac) { true }
+
+      it 'generates a Kubeclient resource for the ClusterRoleBinding for tiller' do
+        is_expected.to eq(resource)
+      end
+    end
+
+    context 'rbac is not enabled' do
+      let(:rbac) { false }
+
+      it 'generates nothing' do
+        is_expected.to be_nil
+      end
+    end
+  end
 end

spec/lib/gitlab/kubernetes/helm/install_command_spec.rb

@@ -3,14 +3,17 @@ require 'rails_helper'
 describe Gitlab::Kubernetes::Helm::InstallCommand do
   let(:files) { { 'ca.pem': 'some file content' } }
   let(:repository) { 'https://repository.example.com' }
+  let(:rbac) { false }
   let(:version) { '1.2.3' }
 
   let(:install_command) do
     described_class.new(
       name: 'app-name',
       chart: 'chart-name',
+      rbac: rbac,
       files: files,
-      version: version, repository: repository
+      version: version,
+      repository: repository
     )
   end
 
@@ -21,9 +24,52 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
       <<~EOS
       helm init --client-only >/dev/null
       helm repo add app-name https://repository.example.com
-      helm install chart-name --name app-name --tls --tls-ca-cert /data/helm/app-name/config/ca.pem --tls-cert /data/helm/app-name/config/cert.pem --tls-key /data/helm/app-name/config/key.pem --version 1.2.3 --namespace gitlab-managed-apps -f /data/helm/app-name/config/values.yaml >/dev/null
+      #{helm_install_comand}
       EOS
     end
+
+    let(:helm_install_comand) do
+      <<~EOS.squish
+      helm install chart-name
+        --name app-name
+        --tls
+        --tls-ca-cert /data/helm/app-name/config/ca.pem
+        --tls-cert /data/helm/app-name/config/cert.pem
+        --tls-key /data/helm/app-name/config/key.pem
+        --version 1.2.3
+        --namespace gitlab-managed-apps
+        -f /data/helm/app-name/config/values.yaml >/dev/null
+      EOS
+    end
+  end
+
+  context 'when rbac is true' do
+    let(:rbac) { true }
+
+    it_behaves_like 'helm commands' do
+      let(:commands) do
+        <<~EOS
+        helm init --client-only >/dev/null
+        helm repo add app-name https://repository.example.com
+        #{helm_install_command}
+        EOS
+      end
+
+      let(:helm_install_command) do
+        <<~EOS.squish
+        helm install chart-name
+          --name app-name
+          --tls
+          --tls-ca-cert /data/helm/app-name/config/ca.pem
+          --tls-cert /data/helm/app-name/config/cert.pem
+          --tls-key /data/helm/app-name/config/key.pem
+          --version 1.2.3
+          --set rbac.create\\=true,rbac.enabled\\=true
+          --namespace gitlab-managed-apps
+          -f /data/helm/app-name/config/values.yaml >/dev/null
+        EOS
+      end
+    end
   end
 
   context 'when there is no repository' do
@@ -33,7 +79,21 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
       let(:commands) do
         <<~EOS
         helm init --client-only >/dev/null
-         helm install chart-name --name app-name --tls --tls-ca-cert /data/helm/app-name/config/ca.pem --tls-cert /data/helm/app-name/config/cert.pem --tls-key /data/helm/app-name/config/key.pem --version 1.2.3 --namespace gitlab-managed-apps -f /data/helm/app-name/config/values.yaml >/dev/null
+        #{helm_install_command}
+        EOS
+      end
+
+      let(:helm_install_command) do
+        <<~EOS.squish
+        helm install chart-name
+          --name app-name
+          --tls
+          --tls-ca-cert /data/helm/app-name/config/ca.pem
+          --tls-cert /data/helm/app-name/config/cert.pem
+          --tls-key /data/helm/app-name/config/key.pem
+          --version 1.2.3
+          --namespace gitlab-managed-apps
+          -f /data/helm/app-name/config/values.yaml >/dev/null
         EOS
       end
     end
@@ -47,7 +107,17 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
         <<~EOS
         helm init --client-only >/dev/null
         helm repo add app-name https://repository.example.com
-         helm install chart-name --name app-name --version 1.2.3 --namespace gitlab-managed-apps -f /data/helm/app-name/config/values.yaml >/dev/null
+        #{helm_install_command}
+        EOS
+      end
+
+      let(:helm_install_command) do
+        <<~EOS.squish
+        helm install chart-name
+           --name app-name
+           --version 1.2.3
+           --namespace gitlab-managed-apps
+           -f /data/helm/app-name/config/values.yaml >/dev/null
         EOS
       end
     end
@@ -61,12 +131,61 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
         <<~EOS
         helm init --client-only >/dev/null
         helm repo add app-name https://repository.example.com
-         helm install chart-name --name app-name --tls --tls-ca-cert /data/helm/app-name/config/ca.pem --tls-cert /data/helm/app-name/config/cert.pem --tls-key /data/helm/app-name/config/key.pem --namespace gitlab-managed-apps -f /data/helm/app-name/config/values.yaml >/dev/null
+        #{helm_install_command}
+        EOS
+      end
+
+      let(:helm_install_command) do
+        <<~EOS.squish
+        helm install chart-name
+          --name app-name
+          --tls
+          --tls-ca-cert /data/helm/app-name/config/ca.pem
+          --tls-cert /data/helm/app-name/config/cert.pem
+          --tls-key /data/helm/app-name/config/key.pem
+          --namespace gitlab-managed-apps
+          -f /data/helm/app-name/config/values.yaml >/dev/null
         EOS
       end
     end
   end
 
+  describe '#rbac?' do
+    subject { install_command.rbac? }
+
+    context 'rbac is enabled' do
+      let(:rbac) { true }
+
+      it { is_expected.to be_truthy }
+    end
+
+    context 'rbac is not enabled' do
+      let(:rbac) { false }
+
+      it { is_expected.to be_falsey }
+    end
+  end
+
+  describe '#pod_resource' do
+    subject { install_command.pod_resource }
+
+    context 'rbac is enabled' do
+      let(:rbac) { true }
+
+      it 'generates a pod that uses the tiller serviceAccountName' do
+        expect(subject.spec.serviceAccountName).to eq('tiller')
+      end
+    end
+
+    context 'rbac is not enabled' do
+      let(:rbac) { false }
+
+      it 'generates a pod that uses the default serviceAccountName' do
+        expect(subject.spec.serviceAcccountName).to be_nil
+      end
+    end
+  end
+
   describe '#config_map_resource' do
     let(:metadata) do
       {
@@ -84,4 +203,20 @@ describe Gitlab::Kubernetes::Helm::InstallCommand do
       is_expected.to eq(resource)
     end
   end
+
+  describe '#service_account_resource' do
+    subject { install_command.service_account_resource }
+
+    it 'returns nothing' do
+      is_expected.to be_nil
+    end
+  end
+
+  describe '#cluster_role_binding_resource' do
+    subject { install_command.cluster_role_binding_resource }
+
+    it 'returns nothing' do
+      is_expected.to be_nil
+    end
+  end
 end

spec/lib/gitlab/kubernetes/helm/pod_spec.rb

@@ -5,8 +5,9 @@ describe Gitlab::Kubernetes::Helm::Pod do
     let(:app) {  create(:clusters_applications_prometheus) }
     let(:command) {  app.install_command }
     let(:namespace) { Gitlab::Kubernetes::Helm::NAMESPACE }
+    let(:service_account_name) { nil }
 
-    subject { described_class.new(command, namespace) }
+    subject { described_class.new(command, namespace, service_account_name: service_account_name) }
 
     context 'with a command' do
       it 'should generate a Kubeclient::Resource' do
@@ -58,6 +59,20 @@ describe Gitlab::Kubernetes::Helm::Pod do
         expect(volume.configMap['items'].first['key']).to eq(:'values.yaml')
         expect(volume.configMap['items'].first['path']).to eq(:'values.yaml')
       end
+
+      it 'should have no serviceAccountName' do
+        spec = subject.generate.spec
+        expect(spec.serviceAccountName).to be_nil
+      end
+
+      context 'with a service_account_name' do
+        let(:service_account_name) { 'sa' }
+
+        it 'should use the serviceAccountName provided' do
+          spec = subject.generate.spec
+          expect(spec.serviceAccountName).to eq(service_account_name)
+        end
+      end
     end
   end
 end

spec/lib/gitlab/kubernetes/kube_client_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Kubernetes::KubeClient do
+  include KubernetesHelpers
+
+  let(:api_url) { 'https://kubernetes.example.com/prefix' }
+  let(:api_groups) { ['api', 'apis/rbac.authorization.k8s.io'] }
+  let(:api_version) { 'v1' }
+  let(:kubeclient_options) { { auth_options: { bearer_token: 'xyz' } } }
+
+  let(:client) { described_class.new(api_url, api_groups, api_version, kubeclient_options) }
+
+  before do
+    stub_kubeclient_discover(api_url)
+  end
+
+  describe '#hashed_clients' do
+    subject { client.hashed_clients }
+
+    it 'has keys from api groups' do
+      expect(subject.keys).to match_array api_groups
+    end
+
+    it 'has values of Kubeclient::Client' do
+      expect(subject.values).to all(be_an_instance_of Kubeclient::Client)
+    end
+  end
+
+  describe '#clients' do
+    subject { client.clients }
+
+    it 'is not empty' do
+      is_expected.to be_present
+    end
+
+    it 'is an array of Kubeclient::Client objects' do
+      is_expected.to all(be_an_instance_of Kubeclient::Client)
+    end
+
+    it 'has each API group url' do
+      expected_urls = api_groups.map { |group| "#{api_url}/#{group}" }
+
+      expect(subject.map(&:api_endpoint).map(&:to_s)).to match_array(expected_urls)
+    end
+
+    it 'has the kubeclient options' do
+      subject.each do |client|
+        expect(client.auth_options).to eq({ bearer_token: 'xyz' })
+      end
+    end
+
+    it 'has the api_version' do
+      subject.each do |client|
+        expect(client.instance_variable_get(:@api_version)).to eq('v1')
+      end
+    end
+  end
+
+  describe '#core_client' do
+    subject { client.core_client }
+
+    it 'is a Kubeclient::Client' do
+      is_expected.to be_an_instance_of Kubeclient::Client
+    end
+
+    it 'has the core API endpoint' do
+      expect(subject.api_endpoint.to_s).to match(%r{\/api\Z})
+    end
+  end
+
+  describe '#rbac_client' do
+    subject { client.rbac_client }
+
+    it 'is a Kubeclient::Client' do
+      is_expected.to be_an_instance_of Kubeclient::Client
+    end
+
+    it 'has the RBAC API group endpoint' do
+      expect(subject.api_endpoint.to_s).to match(%r{\/apis\/rbac.authorization.k8s.io\Z})
+    end
+  end
+
+  describe '#extensions_client' do
+    subject { client.extensions_client }
+
+    let(:api_groups) { ['apis/extensions'] }
+
+    it 'is a Kubeclient::Client' do
+      is_expected.to be_an_instance_of Kubeclient::Client
+    end
+
+    it 'has the extensions API group endpoint' do
+      expect(subject.api_endpoint.to_s).to match(%r{\/apis\/extensions\Z})
+    end
+  end
+
+  describe '#discover!' do
+    it 'makes a discovery request for each API group' do
+      client.discover!
+
+      api_groups.each do |api_group|
+        discovery_url = api_url + '/' + api_group + '/v1'
+        expect(WebMock).to have_requested(:get, discovery_url).once
+      end
+    end
+  end
+
+  describe 'core API' do
+    let(:core_client) { client.core_client }
+
+    [
+      :get_pods,
+      :get_secrets,
+      :get_config_map,
+      :get_pod,
+      :get_namespace,
+      :get_service,
+      :get_service_account,
+      :delete_pod,
+      :create_config_map,
+      :create_namespace,
+      :create_pod,
+      :create_service_account,
+      :update_config_map,
+      :update_service_account
+    ].each do |method|
+      describe "##{method}" do
+        it 'delegates to the core client' do
+          expect(client).to delegate_method(method).to(:core_client)
+        end
+
+        it 'responds to the method' do
+          expect(client).to respond_to method
+        end
+      end
+    end
+  end
+
+  describe 'rbac API group' do
+    let(:rbac_client) { client.rbac_client }
+
+    [
+      :create_cluster_role_binding,
+      :get_cluster_role_binding,
+      :update_cluster_role_binding
+    ].each do |method|
+      describe "##{method}" do
+        it 'delegates to the rbac client' do
+          expect(client).to delegate_method(method).to(:rbac_client)
+        end
+
+        it 'responds to the method' do
+          expect(client).to respond_to method
+        end
+
+        context 'no rbac client' do
+          let(:api_groups) { ['api'] }
+
+          it 'throws an error' do
+            expect { client.public_send(method) }.to raise_error(Module::DelegationError)
+          end
+        end
+      end
+    end
+  end
+
+  describe 'extensions API group' do
+    let(:api_groups) { ['apis/extensions'] }
+    let(:api_version) { 'v1beta1' }
+    let(:extensions_client) { client.extensions_client }
+
+    describe '#get_deployments' do
+      it 'delegates to the extensions client' do
+        expect(client).to delegate_method(:get_deployments).to(:extensions_client)
+      end
+
+      it 'responds to the method' do
+        expect(client).to respond_to :get_deployments
+      end
+
+      context 'no extensions client' do
+        let(:api_groups) { ['api'] }
+        let(:api_version) { 'v1' }
+
+        it 'throws an error' do
+          expect { client.get_deployments }.to raise_error(Module::DelegationError)
+        end
+      end
+    end
+  end
+
+  describe 'non-entity methods' do
+    it 'does not proxy for non-entity methods' do
+      expect(client.clients.first).to respond_to :proxy_url
+
+      expect(client).not_to respond_to :proxy_url
+    end
+
+    it 'throws an error' do
+      expect { client.proxy_url }.to raise_error(NoMethodError)
+    end
+  end
+
+  describe '#get_pod_log' do
+    let(:core_client) { client.core_client }
+
+    it 'is delegated to the core client' do
+      expect(client).to delegate_method(:get_pod_log).to(:core_client)
+    end
+
+    context 'when no core client' do
+      let(:api_groups) { ['apis/extensions'] }
+
+      it 'throws an error' do
+        expect { client.get_pod_log('pod-name') }.to raise_error(Module::DelegationError)
+      end
+    end
+  end
+
+  describe '#watch_pod_log' do
+    let(:core_client) { client.core_client }
+
+    it 'is delegated to the core client' do
+      expect(client).to delegate_method(:watch_pod_log).to(:core_client)
+    end
+
+    context 'when no core client' do
+      let(:api_groups) { ['apis/extensions'] }
+
+      it 'throws an error' do
+        expect { client.watch_pod_log('pod-name') }.to raise_error(Module::DelegationError)
+      end
+    end
+  end
+
+  describe 'methods that do not exist on any client' do
+    it 'throws an error' do
+      expect { client.non_existent_method }.to raise_error(NoMethodError)
+    end
+
+    it 'returns false for respond_to' do
+      expect(client.respond_to?(:non_existent_method)).to be_falsey
+    end
+  end
+end

spec/lib/gitlab/kubernetes/service_account_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Kubernetes::ServiceAccount do
+  let(:name) { 'a_service_account' }
+  let(:namespace_name) { 'a_namespace' }
+  let(:service_account) { described_class.new(name, namespace_name) }
+
+  it { expect(service_account.name).to eq(name) }
+  it { expect(service_account.namespace_name).to eq(namespace_name) }
+
+  describe '#generate' do
+    let(:resource) do
+      ::Kubeclient::Resource.new(metadata: { name: name, namespace: namespace_name })
+    end
+
+    subject { service_account.generate }
+
+    it 'should build a Kubeclient Resource' do
+      is_expected.to eq(resource)
+    end
+  end
+end

spec/models/clusters/applications/helm_spec.rb

@@ -47,5 +47,19 @@ describe Clusters::Applications::Helm do
       cert = OpenSSL::X509::Certificate.new(subject.files[:'cert.pem'])
       expect(cert.not_after).to be > 999.years.from_now
     end
+
+    describe 'rbac' do
+      context 'non rbac cluster' do
+        it { expect(subject).not_to be_rbac }
+      end
+
+      context 'rbac cluster' do
+        before do
+          helm.cluster.platform_kubernetes.rbac!
+        end
+
+        it { expect(subject).to be_rbac }
+      end
+    end
   end
 end

spec/models/clusters/applications/ingress_spec.rb

@@ -88,9 +88,18 @@ describe Clusters::Applications::Ingress do
       expect(subject.name).to eq('ingress')
       expect(subject.chart).to eq('stable/nginx-ingress')
       expect(subject.version).to eq('0.23.0')
+      expect(subject).not_to be_rbac
       expect(subject.files).to eq(ingress.files)
     end
 
+    context 'on a rbac enabled cluster' do
+      before do
+        ingress.cluster.platform_kubernetes.rbac!
+      end
+
+      it { is_expected.to be_rbac }
+    end
+
     context 'application failed to install previously' do
       let(:ingress) { create(:clusters_applications_ingress, :errored, version: 'nginx') }
 

spec/models/clusters/applications/jupyter_spec.rb

@@ -51,10 +51,19 @@ describe Clusters::Applications::Jupyter do
       expect(subject.name).to eq('jupyter')
       expect(subject.chart).to eq('jupyter/jupyterhub')
       expect(subject.version).to eq('v0.6')
+      expect(subject).not_to be_rbac
       expect(subject.repository).to eq('https://jupyterhub.github.io/helm-chart/')
       expect(subject.files).to eq(jupyter.files)
     end
 
+    context 'on a rbac enabled cluster' do
+      before do
+        jupyter.cluster.platform_kubernetes.rbac!
+      end
+
+      it { is_expected.to be_rbac }
+    end
+
     context 'application failed to install previously' do
       let(:jupyter) { create(:clusters_applications_jupyter, :errored, version: '0.0.1') }
 

spec/models/clusters/applications/prometheus_spec.rb

 require 'rails_helper'
 
 describe Clusters::Applications::Prometheus do
+  include KubernetesHelpers
+
   include_examples 'cluster application core specs', :clusters_applications_prometheus
   include_examples 'cluster application status specs', :cluster_application_prometheus
 
@@ -107,26 +109,14 @@ describe Clusters::Applications::Prometheus do
     end
 
     context 'cluster has kubeclient' do
-      let(:kubernetes_url) { 'http://example.com' }
-      let(:k8s_discover_response) do
-        {
-          resources: [
-            {
-              name: 'service',
-              kind: 'Service'
-            }
-          ]
-        }
-      end
-
-      let(:kube_client) { Kubeclient::Client.new(kubernetes_url) }
+      let(:kubernetes_url) { subject.cluster.platform_kubernetes.api_url }
+      let(:kube_client) { subject.cluster.kubeclient.core_client }
 
-      let(:cluster) { create(:cluster) }
-      subject { create(:clusters_applications_prometheus, cluster: cluster) }
+      subject { create(:clusters_applications_prometheus) }
 
       before do
-        allow(kube_client.rest_client).to receive(:get).and_return(k8s_discover_response.to_json)
-        allow(subject.cluster).to receive(:kubeclient).and_return(kube_client)
+        subject.cluster.platform_kubernetes.namespace = 'a-namespace'
+        stub_kubeclient_discover(subject.cluster.platform_kubernetes.api_url)
       end
 
       it 'creates proxy prometheus rest client' do
@@ -134,7 +124,7 @@ describe Clusters::Applications::Prometheus do
       end
 
       it 'creates proper url' do
-        expect(subject.prometheus_client.url).to eq('http://example.com/api/v1/namespaces/gitlab-managed-apps/service/prometheus-prometheus-server:80/proxy')
+        expect(subject.prometheus_client.url).to eq("#{kubernetes_url}/api/v1/namespaces/gitlab-managed-apps/services/prometheus-prometheus-server:80/proxy")
       end
 
       it 'copies options and headers from kube client to proxy client' do
@@ -164,9 +154,18 @@ describe Clusters::Applications::Prometheus do
       expect(subject.name).to eq('prometheus')
       expect(subject.chart).to eq('stable/prometheus')
       expect(subject.version).to eq('6.7.3')
+      expect(subject).not_to be_rbac
       expect(subject.files).to eq(prometheus.files)
     end
 
+    context 'on a rbac enabled cluster' do
+      before do
+        prometheus.cluster.platform_kubernetes.rbac!
+      end
+
+      it { is_expected.to be_rbac }
+    end
+
     context 'application failed to install previously' do
       let(:prometheus) { create(:clusters_applications_prometheus, :errored, version: '2.0.0') }
 

spec/models/clusters/applications/runner_spec.rb

@@ -46,10 +46,19 @@ describe Clusters::Applications::Runner do
       expect(subject.name).to eq('runner')
       expect(subject.chart).to eq('runner/gitlab-runner')
       expect(subject.version).to eq('0.1.31')
+      expect(subject).not_to be_rbac
       expect(subject.repository).to eq('https://charts.gitlab.io')
       expect(subject.files).to eq(gitlab_runner.files)
     end
 
+    context 'on a rbac enabled cluster' do
+      before do
+        gitlab_runner.cluster.platform_kubernetes.rbac!
+      end
+
+      it { is_expected.to be_rbac }
+    end
+
     context 'application failed to install previously' do
       let(:gitlab_runner) { create(:clusters_applications_runner, :errored, runner: ci_runner, version: '0.1.13') }
 

spec/models/clusters/cluster_spec.rb

@@ -13,6 +13,10 @@ describe Clusters::Cluster do
   it { is_expected.to delegate_method(:status_reason).to(:provider) }
   it { is_expected.to delegate_method(:status_name).to(:provider) }
   it { is_expected.to delegate_method(:on_creation?).to(:provider) }
+  it { is_expected.to delegate_method(:active?).to(:platform_kubernetes).with_prefix }
+  it { is_expected.to delegate_method(:rbac?).to(:platform_kubernetes).with_prefix }
+  it { is_expected.to delegate_method(:installed?).to(:application_helm).with_prefix }
+  it { is_expected.to delegate_method(:installed?).to(:application_ingress).with_prefix }
   it { is_expected.to respond_to :project }
 
   describe '.enabled' do

spec/models/clusters/platforms/kubernetes_spec.rb

@@ -92,6 +92,30 @@ describe Clusters::Platforms::Kubernetes, :use_clean_rails_memory_store_caching
     end
   end
 
+  describe '#kubeclient' do
+    subject { kubernetes.kubeclient }
+
+    let(:kubernetes) { build(:cluster_platform_kubernetes, :configured, namespace: 'a-namespace') }
+
+    it { is_expected.to be_an_instance_of(Gitlab::Kubernetes::KubeClient) }
+  end
+
+  describe '#rbac?' do
+    subject { kubernetes.rbac? }
+
+    let(:kubernetes) { build(:cluster_platform_kubernetes, :configured) }
+
+    context 'when authorization type is rbac' do
+      let(:kubernetes) { build(:cluster_platform_kubernetes, :rbac_enabled, :configured) }
+
+      it { is_expected.to be_truthy }
+    end
+
+    context 'when authorization type is nil' do
+      it { is_expected.to be_falsey }
+    end
+  end
+
   describe '#actual_namespace' do
     subject { kubernetes.actual_namespace }
 

spec/support/helpers/kubernetes_helpers.rb

@@ -16,6 +16,7 @@ module KubernetesHelpers
   def stub_kubeclient_discover(api_url)
     WebMock.stub_request(:get, api_url + '/api/v1').to_return(kube_response(kube_v1_discovery_body))
     WebMock.stub_request(:get, api_url + '/apis/extensions/v1beta1').to_return(kube_response(kube_v1beta1_discovery_body))
+    WebMock.stub_request(:get, api_url + '/apis/rbac.authorization.k8s.io/v1').to_return(kube_response(kube_v1_rbac_authorization_discovery_body))
   end
 
   def stub_kubeclient_pods(response = nil)
@@ -66,7 +67,8 @@ module KubernetesHelpers
       "resources" => [
         { "name" => "pods", "namespaced" => true, "kind" => "Pod" },
         { "name" => "deployments", "namespaced" => true, "kind" => "Deployment" },
-        { "name" => "secrets", "namespaced" => true, "kind" => "Secret" }
+        { "name" => "secrets", "namespaced" => true, "kind" => "Secret" },
+        { "name" => "services", "namespaced" => true, "kind" => "Service" }
       ]
     }
   end
@@ -77,7 +79,20 @@ module KubernetesHelpers
       "resources" => [
         { "name" => "pods", "namespaced" => true, "kind" => "Pod" },
         { "name" => "deployments", "namespaced" => true, "kind" => "Deployment" },
-        { "name" => "secrets", "namespaced" => true, "kind" => "Secret" }
+        { "name" => "secrets", "namespaced" => true, "kind" => "Secret" },
+        { "name" => "services", "namespaced" => true, "kind" => "Service" }
+      ]
+    }
+  end
+
+  def kube_v1_rbac_authorization_discovery_body
+    {
+      "kind" => "APIResourceList",
+      "resources" => [
+        { "name" => "clusterrolebindings", "namespaced" => false, "kind" => "ClusterRoleBinding" },
+        { "name" => "clusterroles", "namespaced" => false, "kind" => "ClusterRole" },
+        { "name" => "rolebindings", "namespaced" => true, "kind" => "RoleBinding" },
+        { "name" => "roles", "namespaced" => true, "kind" => "Role" }
       ]
     }
   end