Merge branch '38668-revert-copied-kubernetesservice-logic-ee' into 'master'

Port to EE: Copy `KubernetesService` logic in `Clusters::Platforms::Kubernetes` to make it interchangeable. And implement a selector.

See merge request gitlab-org/gitlab-ee!3551

app/controllers/projects/branches_controller.rb

@@ -41,7 +41,7 @@ class Projects::BranchesController < Projects::ApplicationController
     branch_name = sanitize(strip_tags(params[:branch_name]))
     branch_name = Addressable::URI.unescape(branch_name)
 
-    redirect_to_autodeploy = project.empty_repo? && project.deployment_services.present?
+    redirect_to_autodeploy = project.empty_repo? && project.deployment_platform.present?
 
     result = CreateBranchService.new(project, current_user)
         .execute(branch_name, ref)

app/helpers/auto_devops_helper.rb

@@ -26,7 +26,7 @@ module AutoDevopsHelper
 
   def auto_devops_warning_message(project)
     missing_domain = !project.auto_devops&.has_domain?
-    missing_service = !project.kubernetes_service&.active?
+    missing_service = !project.deployment_platform&.active?
 
     if missing_service
       params = {

app/models/ci/pipeline.rb

@@ -378,7 +378,7 @@ module Ci
     end
 
     def has_kubernetes_active?
-      project.kubernetes_service&.active?
+      project.deployment_platform&.active?
     end
 
     def has_stage_seeds?

app/models/clusters/cluster.rb

@@ -17,8 +17,7 @@ module Clusters
     # we force autosave to happen when we save `Cluster` model
     has_one :provider_gcp, class_name: 'Clusters::Providers::Gcp', autosave: true
 
-    # We have to ":destroy" it today to ensure that we clean also the Kubernetes Integration
-    has_one :platform_kubernetes, class_name: 'Clusters::Platforms::Kubernetes', autosave: true, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
+    has_one :platform_kubernetes, class_name: 'Clusters::Platforms::Kubernetes'
 
     has_one :application_helm, class_name: 'Clusters::Applications::Helm'
     has_one :application_ingress, class_name: 'Clusters::Applications::Ingress'
@@ -29,15 +28,9 @@ module Clusters
     validates :name, cluster_name: true
     validate :restrict_modification, on: :update
 
-    # TODO: Move back this into Clusters::Platforms::Kubernetes in 10.3
-    # We need callback here because `enabled` belongs to Clusters::Cluster
-    # Callbacks in Clusters::Platforms::Kubernetes will not be called after update
-    after_save :update_kubernetes_integration!
-
     delegate :status, to: :provider, allow_nil: true
     delegate :status_reason, to: :provider, allow_nil: true
     delegate :on_creation?, to: :provider, allow_nil: true
-    delegate :update_kubernetes_integration!, to: :platform, allow_nil: true
 
     delegate :active?, to: :platform_kubernetes, prefix: true, allow_nil: true
     delegate :installed?, to: :application_helm, prefix: true, allow_nil: true

app/models/clusters/platforms/kubernetes.rb

 module Clusters
   module Platforms
     class Kubernetes < ActiveRecord::Base
+      include Gitlab::CurrentSettings
+      include Gitlab::Kubernetes
+      include ReactiveCaching
+
+      prepend EE::KubernetesService
+
       self.table_name = 'cluster_platforms_kubernetes'
+      self.reactive_cache_key = ->(kubernetes) { [kubernetes.class.model_name.singular, kubernetes.id] }
 
       belongs_to :cluster, inverse_of: :platform_kubernetes, class_name: 'Clusters::Cluster'
 
@@ -29,19 +36,14 @@ module Clusters
       validates :api_url, url: true, presence: true
       validates :token, presence: true
 
-      # TODO: Glue code till we migrate Kubernetes Integration into Platforms::Kubernetes
-      after_destroy :destroy_kubernetes_integration!
+      after_save :clear_reactive_cache!
 
       alias_attribute :ca_pem, :ca_cert
 
       delegate :project, to: :cluster, allow_nil: true
       delegate :enabled?, to: :cluster, allow_nil: true
 
-      class << self
-        def namespace_for_project(project)
-          "#{project.path}-#{project.id}"
-        end
-      end
+      alias_method :active?, :enabled?
 
       def actual_namespace
         if namespace.present?
@@ -51,58 +53,127 @@ module Clusters
         end
       end
 
-      def default_namespace
-        self.class.namespace_for_project(project) if project
+      def predefined_variables
+        config = YAML.dump(kubeconfig)
+
+        variables = [
+          { key: 'KUBE_URL', value: api_url, public: true },
+          { key: 'KUBE_TOKEN', value: token, public: false },
+          { key: 'KUBE_NAMESPACE', value: actual_namespace, public: true },
+          { key: 'KUBECONFIG', value: config, public: false, file: true }
+        ]
+
+        if ca_pem.present?
+          variables << { key: 'KUBE_CA_PEM', value: ca_pem, public: true }
+          variables << { key: 'KUBE_CA_PEM_FILE', value: ca_pem, public: true, file: true }
+        end
+
+        variables
       end
 
-      def kubeclient
-        @kubeclient ||= kubernetes_service.kubeclient if manages_kubernetes_service?
+      # Constructs a list of terminals from the reactive cache
+      #
+      # Returns nil if the cache is empty, in which case you should try again a
+      # short time later
+      def terminals(environment)
+        with_reactive_cache do |data|
+          pods = filter_by_label(data[:pods], app: environment.slug)
+          terminals = pods.flat_map { |pod| terminals_for_pod(api_url, actual_namespace, pod) }
+          terminals.each { |terminal| add_terminal_auth(terminal, terminal_auth) }
+        end
       end
 
-      def update_kubernetes_integration!
-        raise 'Kubernetes service already configured' unless manages_kubernetes_service?
+      # Caches resources in the namespace so other calls don't need to block on
+      # network access
+      def calculate_reactive_cache
+        return unless enabled? && project && !project.pending_delete?
+
+        # We may want to cache extra things in the future
+        { pods: read_pods }
+      end
+
+      def kubeclient
+        @kubeclient ||= build_kubeclient!
+      end
 
-        # This is neccesary, otheriwse enabled? returns true even though cluster updated with enabled: false
-        cluster.reload
+      private
 
-        ensure_kubernetes_service&.update!(
-          active: enabled?,
-          api_url: api_url,
-          namespace: namespace,
+      def kubeconfig
+        to_kubeconfig(
+          url: api_url,
+          namespace: actual_namespace,
           token: token,
-          ca_pem: ca_cert
-        )
+          ca_pem: ca_pem)
       end
 
-      def active?
-        manages_kubernetes_service?
+      def default_namespace
+        return unless project
+
+        slug = "#{project.path}-#{project.id}".downcase
+        slug.gsub(/[^-a-z0-9]/, '-').gsub(/^-+/, '')
       end
 
-      private
+      def build_kubeclient!(api_path: 'api', api_version: 'v1')
+        raise "Incomplete settings" unless api_url && actual_namespace
 
-      def enforce_namespace_to_lower_case
-        self.namespace = self.namespace&.downcase
+        unless (username && password) || token
+          raise "Either username/password or token is required to access API"
+        end
+
+        ::Kubeclient::Client.new(
+          join_api_url(api_path),
+          api_version,
+          auth_options: kubeclient_auth_options,
+          ssl_options: kubeclient_ssl_options,
+          http_proxy_uri: ENV['http_proxy']
+        )
       end
 
-      # TODO: glue code till we migrate Kubernetes Service into Platforms::Kubernetes class
-      def manages_kubernetes_service?
-        return true unless kubernetes_service&.active?
+      # Returns a hash of all pods in the namespace
+      def read_pods
+        kubeclient = build_kubeclient!
+
+        kubeclient.get_pods(namespace: actual_namespace).as_json
+      rescue KubeException => err
+        raise err unless err.error_code == 404
 
-        kubernetes_service.api_url == api_url
+        []
       end
 
-      def destroy_kubernetes_integration!
-        return unless manages_kubernetes_service?
+      def kubeclient_ssl_options
+        opts = { verify_ssl: OpenSSL::SSL::VERIFY_PEER }
 
-        kubernetes_service&.destroy!
+        if ca_pem.present?
+          opts[:cert_store] = OpenSSL::X509::Store.new
+          opts[:cert_store].add_cert(OpenSSL::X509::Certificate.new(ca_pem))
+        end
+
+        opts
       end
 
-      def kubernetes_service
-        @kubernetes_service ||= project&.kubernetes_service
+      def kubeclient_auth_options
+        { bearer_token: token }
       end
 
-      def ensure_kubernetes_service
-        @kubernetes_service ||= kubernetes_service || project&.build_kubernetes_service
+      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,
+          ca_pem: ca_pem,
+          max_session_time: current_application_settings.terminal_max_session_time
+        }
+      end
+
+      def enforce_namespace_to_lower_case
+        self.namespace = self.namespace&.downcase
       end
     end
   end

app/models/environment.rb

@@ -137,16 +137,16 @@ class Environment < ActiveRecord::Base
     end
   end
 
-  def deployment_service_ready?
-    project.deployment_service.present? && available? && last_deployment.present?
+  def has_terminals?
+    project.deployment_platform.present? && available? && last_deployment.present?
   end
 
   def terminals
-    project.deployment_service.terminals(self) if deployment_service_ready?
+    project.deployment_platform.terminals(self) if has_terminals?
   end
 
   def rollout_status
-    project.deployment_service.rollout_status(self) if deployment_service_ready?
+    project.deployment_platform.rollout_status(self) if has_terminals?
   end
 
   def has_metrics?

app/models/project.rb

@@ -906,12 +906,10 @@ class Project < ActiveRecord::Base
     @ci_service ||= ci_services.reorder(nil).find_by(active: true)
   end
 
-  def deployment_services
-    services.where(category: :deployment)
-  end
-
-  def deployment_service
-    @deployment_service ||= deployment_services.reorder(nil).find_by(active: true)
+  # TODO: This will be extended for multiple enviroment clusters
+  def deployment_platform
+    @deployment_platform ||= clusters.find_by(enabled: true)&.platform_kubernetes
+    @deployment_platform ||= services.where(category: :deployment).reorder(nil).find_by(active: true)
   end
 
   def monitoring_services
@@ -1557,9 +1555,9 @@ class Project < ActiveRecord::Base
   end
 
   def deployment_variables
-    return [] unless deployment_service
+    return [] unless deployment_platform
 
-    deployment_service.predefined_variables
+    deployment_platform.predefined_variables
   end
 
   def auto_devops_variables

app/models/project_services/kubernetes_service.rb

+##
+# NOTE:
+# We'll move this class to Clusters::Platforms::Kubernetes, which contains exactly the same logic.
+# After we've migrated data, we'll remove KubernetesService. This would happen in a few months.
+# If you're modyfiyng this class, please note that you should update the same change in Clusters::Platforms::Kubernetes.
 class KubernetesService < DeploymentService
   include Gitlab::CurrentSettings
   include Gitlab::Kubernetes

app/serializers/environment_entity.rb

@@ -23,7 +23,7 @@ class EnvironmentEntity < Grape::Entity
     stop_project_environment_path(environment.project, environment)
   end
 
-  expose :terminal_path, if: ->(*) { environment.deployment_service_ready? } do |environment|
+  expose :terminal_path, if: ->(*) { environment.has_terminals? } do |environment|
     can?(request.current_user, :admin_environment, environment.project) &&
       terminal_project_environment_path(environment.project, environment)
   end

app/views/projects/clusters/new.html.haml

@@ -5,7 +5,7 @@
   .col-sm-4
     = render 'sidebar'
   .col-sm-8
-    - if @project.kubernetes_service&.active?
+    - if @project.deployment_platform&.active?
       %h4.prepend-top-0= s_('ClusterIntegration|Cluster management')
 
       %p= s_('ClusterIntegration|A cluster has been set up on this project through the Kubernetes integration page')

app/views/projects/edit.html.haml

@@ -159,7 +159,7 @@
             %ul
               %li Be careful. Renaming a project's repository can have unintended side effects.
               %li You will need to update your local repositories to point to the new location.
-              - if @project.deployment_services.any?
+              - if @project.deployment_platform.present?
                 %li Your deployment services will be broken, you will need to manually fix the services after renaming.
           = f.submit 'Rename project', class: "btn btn-warning"
       - if can?(current_user, :change_namespace, @project)

app/views/projects/environments/_terminal_button.html.haml

-- if environment.deployment_service_ready? && can?(current_user, :admin_environment, @project)
+- if environment.has_terminals? && can?(current_user, :admin_environment, @project)
   = link_to terminal_project_environment_path(@project, environment), class: 'btn terminal-button' do
     = icon('terminal')

app/views/projects/show.html.haml

@@ -67,7 +67,7 @@
         - if koding_enabled? && @repository.koding_yml.blank?
           %li.missing
             = link_to  _('Set up Koding'), add_koding_stack_path(@project)
-        - if @repository.gitlab_ci_yml.blank? && @project.deployment_service.present?
+        - if @repository.gitlab_ci_yml.blank? && @project.deployment_platform.present?
           %li.missing
             = link_to add_special_file_path(@project, file_name: '.gitlab-ci.yml', commit_message: 'Set up auto deploy', branch_name: 'auto-deploy', context: 'autodeploy') do
               #{ _('Set up auto deploy') }

lib/gitlab/prometheus/queries/query_additional_metrics.rb

@@ -76,7 +76,7 @@ module Gitlab
             timeframe_start: timeframe_start,
             timeframe_end: timeframe_end,
             ci_environment_slug: environment.slug,
-            kube_namespace: environment.project.kubernetes_service&.actual_namespace || '',
+            kube_namespace: environment.project.deployment_platform&.actual_namespace || '',
             environment_filter: %{container_name!="POD",environment="#{environment.slug}"}
           }
         end

spec/controllers/projects/branches_controller_spec.rb

@@ -113,10 +113,44 @@ describe Projects::BranchesController do
           expect(response).to redirect_to project_tree_path(project, branch)
         end
 
+        shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+          it 'redirects to autodeploy setup page' do
+            result = { status: :success, branch: double(name: branch) }
+
+            expect_any_instance_of(CreateBranchService).to receive(:execute).and_return(result)
+            expect(SystemNoteService).to receive(:new_issue_branch).and_return(true)
+
+            post :create,
+              namespace_id: project.namespace.to_param,
+              project_id: project.to_param,
+              branch_name: branch,
+              issue_iid: issue.iid
+
+            expect(response.location).to include(project_new_blob_path(project, branch))
+            expect(response).to have_gitlab_http_status(302)
+          end
+        end
+
+        context 'when user configured kubernetes from Integration > Kubernetes' do
+          before do
+            project.services << build(:kubernetes_service)
+          end
+
+          it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+        end
+
+        context 'when user configured kubernetes from CI/CD > Clusters' do
+          before do
+            create(:cluster, :provided_by_gcp, projects: [project])
+          end
+
+          it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+        end
+
         it 'redirects to autodeploy setup page' do
           result = { status: :success, branch: double(name: branch) }
 
-          project.services << build(:kubernetes_service)
+          create(:cluster, :provided_by_gcp, projects: [project])
 
           expect_any_instance_of(CreateBranchService).to receive(:execute).and_return(result)
           expect(SystemNoteService).to receive(:new_issue_branch).and_return(true)

spec/controllers/projects/environments_controller_spec.rb

@@ -34,7 +34,7 @@ describe Projects::EnvironmentsController do
 
     context 'when requesting JSON response for folders' do
       before do
-        allow_any_instance_of(Environment).to receive(:deployment_service_ready?).and_return(true)
+        allow_any_instance_of(Environment).to receive(:has_terminals?).and_return(true)
         allow_any_instance_of(Environment).to receive(:rollout_status).and_return(kube_deployment_rollout_status)
 
         create(:environment, project: project,

spec/ee/spec/models/project_services/kubernetes_service_spec.rb

@@ -4,51 +4,65 @@ describe KubernetesService, models: true, use_clean_rails_memory_store_caching:
   include KubernetesHelpers
   include ReactiveCachingHelpers
 
-  let(:project) { build_stubbed(:kubernetes_project) }
-  let(:service) { project.kubernetes_service }
+  shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+    let(:service) { project.deployment_platform }
 
-  describe '#rollout_status' do
-    let(:environment) { build(:environment, project: project, name: "env", slug: "env-000000") }
+    describe '#rollout_status' do
+      let(:environment) { build(:environment, project: project, name: "env", slug: "env-000000") }
 
-    subject(:rollout_status) { service.rollout_status(environment) }
+      subject(:rollout_status) { service.rollout_status(environment) }
 
-    context 'with valid deployments' do
-      before do
-        stub_reactive_cache(
-          service,
-          deployments: [kube_deployment(app: environment.slug), kube_deployment]
-        )
-      end
+      context 'with valid deployments' do
+        before do
+          stub_reactive_cache(
+            service,
+            deployments: [kube_deployment(app: environment.slug), kube_deployment]
+          )
+        end
 
-      it 'creates a matching RolloutStatus' do
-        expect(rollout_status).to be_kind_of(::Gitlab::Kubernetes::RolloutStatus)
-        expect(rollout_status.deployments.map(&:labels)).to eq([{ 'app' => 'env-000000' }])
+        it 'creates a matching RolloutStatus' do
+          expect(rollout_status).to be_kind_of(::Gitlab::Kubernetes::RolloutStatus)
+          expect(rollout_status.deployments.map(&:labels)).to eq([{ 'app' => 'env-000000' }])
+        end
       end
-    end
 
-    context 'with empty list of deployments' do
-      before do
-        stub_reactive_cache(
-          service,
-          deployments: []
-        )
-      end
+      context 'with empty list of deployments' do
+        before do
+          stub_reactive_cache(
+            service,
+            deployments: []
+          )
+        end
 
-      it 'creates a matching RolloutStatus' do
-        expect(rollout_status).to be_kind_of(::Gitlab::Kubernetes::RolloutStatus)
-        expect(rollout_status).to be_not_found
+        it 'creates a matching RolloutStatus' do
+          expect(rollout_status).to be_kind_of(::Gitlab::Kubernetes::RolloutStatus)
+          expect(rollout_status).to be_not_found
+        end
       end
-    end
 
-    context 'not yet loaded deployments' do
-      before do
-        stub_reactive_cache
-      end
+      context 'not yet loaded deployments' do
+        before do
+          stub_reactive_cache
+        end
 
-      it 'creates a matching RolloutStatus' do
-        expect(rollout_status).to be_kind_of(::Gitlab::Kubernetes::RolloutStatus)
-        expect(rollout_status).to be_loading
+        it 'creates a matching RolloutStatus' do
+          expect(rollout_status).to be_kind_of(::Gitlab::Kubernetes::RolloutStatus)
+          expect(rollout_status).to be_loading
+        end
       end
     end
   end
+
+  context 'when user configured kubernetes from Integration > Kubernetes' do
+    let(:project) { create(:kubernetes_project) }
+
+    it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+  end
+
+  context 'when user configured kubernetes from CI/CD > Clusters' do
+    let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+    let(:project) { cluster.project }
+
+    it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+  end
 end

spec/features/auto_deploy_spec.rb

@@ -4,52 +4,74 @@ describe 'Auto deploy' do
   let(:user) { create(:user) }
   let(:project) { create(:project, :repository) }
 
-  before do
-    create :kubernetes_service, project: project
-    project.team << [user, :master]
-    sign_in user
-  end
+  shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+    context 'when no deployment service is active' do
+      before do
+        trun_off
+      end
 
-  context 'when no deployment service is active' do
-    before do
-      project.kubernetes_service.update!(active: false)
+      it 'does not show a button to set up auto deploy' do
+        visit project_path(project)
+        expect(page).to have_no_content('Set up auto deploy')
+      end
     end
 
-    it 'does not show a button to set up auto deploy' do
-      visit project_path(project)
-      expect(page).to have_no_content('Set up auto deploy')
+    context 'when a deployment service is active' do
+      before do
+        trun_on
+        visit project_path(project)
+      end
+
+      it 'shows a button to set up auto deploy' do
+        expect(page).to have_link('Set up auto deploy')
+      end
+
+      it 'includes OpenShift as an available template', :js do
+        click_link 'Set up auto deploy'
+        click_button 'Apply a GitLab CI Yaml template'
+
+        within '.gitlab-ci-yml-selector' do
+          expect(page).to have_content('OpenShift')
+        end
+      end
+
+      it 'creates a merge request using "auto-deploy" branch', :js do
+        click_link 'Set up auto deploy'
+        click_button 'Apply a GitLab CI Yaml template'
+        within '.gitlab-ci-yml-selector' do
+          click_on 'OpenShift'
+        end
+        wait_for_requests
+        click_button 'Commit changes'
+
+        expect(page).to have_content('New Merge Request From auto-deploy into master')
+      end
     end
   end
 
-  context 'when a deployment service is active' do
+  context 'when user configured kubernetes from Integration > Kubernetes' do
     before do
-      project.kubernetes_service.update!(active: true)
-      visit project_path(project)
+      create :kubernetes_service, project: project
+      project.team << [user, :master]
+      sign_in user
     end
 
-    it 'shows a button to set up auto deploy' do
-      expect(page).to have_link('Set up auto deploy')
-    end
+    let(:trun_on) { project.deployment_platform.update!(active: true) }
+    let(:trun_off) { project.deployment_platform.update!(active: false) }
 
-    it 'includes OpenShift as an available template', :js do
-      click_link 'Set up auto deploy'
-      click_button 'Apply a GitLab CI Yaml template'
+    it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+  end
 
-      within '.gitlab-ci-yml-selector' do
-        expect(page).to have_content('OpenShift')
-      end
+  context 'when user configured kubernetes from CI/CD > Clusters' do
+    before do
+      create(:cluster, :provided_by_gcp, projects: [project])
+      project.team << [user, :master]
+      sign_in user
     end
 
-    it 'creates a merge request using "auto-deploy" branch', :js do
-      click_link 'Set up auto deploy'
-      click_button 'Apply a GitLab CI Yaml template'
-      within '.gitlab-ci-yml-selector' do
-        click_on 'OpenShift'
-      end
-      wait_for_requests
-      click_button 'Commit changes'
+    let(:trun_on) { project.deployment_platform.cluster.update!(enabled: true) }
+    let(:trun_off) { project.deployment_platform.cluster.update!(enabled: false) }
 
-      expect(page).to have_content('New Merge Request From auto-deploy into master')
-    end
+    it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
   end
 end

spec/features/projects/clusters/interchangeability_spec.rb

+require 'spec_helper'
+
+feature 'Interchangeability between KubernetesService and Platform::Kubernetes' do
+  EXCEPT_METHODS = %i[test title description help fields initialize_properties namespace namespace= api_url api_url=].freeze
+  EXCEPT_METHODS_GREP_V = %w[_touched? _changed? _was].freeze
+
+  it 'Clusters::Platform::Kubernetes covers core interfaces in KubernetesService' do
+    expected_interfaces = KubernetesService.instance_methods(false)
+    expected_interfaces = expected_interfaces - EXCEPT_METHODS
+    EXCEPT_METHODS_GREP_V.each do |g|
+      expected_interfaces = expected_interfaces.grep_v(/#{Regexp.escape(g)}\z/)
+    end
+
+    expect(expected_interfaces - Clusters::Platforms::Kubernetes.instance_methods).to be_empty
+  end
+end

spec/features/projects/environments/environment_spec.rb

@@ -101,35 +101,48 @@ feature 'Environment' do
           end
 
           context 'with terminal' do
-            let(:project) { create(:kubernetes_project, :test_repo) }
+            shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+              context 'for project master' do
+                let(:role) { :master }
 
-            context 'for project master' do
-              let(:role) { :master }
+                scenario 'it shows the terminal button' do
+                  expect(page).to have_terminal_button
+                end
 
-              scenario 'it shows the terminal button' do
-                expect(page).to have_terminal_button
+                context 'web terminal', :js do
+                  before do
+                    # Stub #terminals as it causes js-enabled feature specs to render the page incorrectly
+                    allow_any_instance_of(Environment).to receive(:terminals) { nil }
+                    visit terminal_project_environment_path(project, environment)
+                  end
+
+                  it 'displays a web terminal' do
+                    expect(page).to have_selector('#terminal')
+                    expect(page).to have_link(nil, href: environment.external_url)
+                  end
+                end
               end
 
-              context 'web terminal', :js do
-                before do
-                  # Stub #terminals as it causes js-enabled feature specs to render the page incorrectly
-                  allow_any_instance_of(Environment).to receive(:terminals) { nil }
-                  visit terminal_project_environment_path(project, environment)
-                end
+              context 'for developer' do
+                let(:role) { :developer }
 
-                it 'displays a web terminal' do
-                  expect(page).to have_selector('#terminal')
-                  expect(page).to have_link(nil, href: environment.external_url)
+                scenario 'does not show terminal button' do
+                  expect(page).not_to have_terminal_button
                 end
               end
             end
 
-            context 'for developer' do
-              let(:role) { :developer }
+            context 'when user configured kubernetes from Integration > Kubernetes' do
+              let(:project) { create(:kubernetes_project, :test_repo) }
 
-              scenario 'does not show terminal button' do
-                expect(page).not_to have_terminal_button
-              end
+              it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+            end
+
+            context 'when user configured kubernetes from CI/CD > Clusters' do
+              let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+              let(:project) { cluster.project }
+
+              it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
             end
           end
 

spec/features/projects/environments/environments_spec.rb

@@ -208,22 +208,35 @@ feature 'Environments page', :js do
         end
 
         context 'when kubernetes terminal is available' do
-          let(:project) { create(:kubernetes_project, :test_repo) }
+          shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+            context 'for project master' do
+              let(:role) { :master }
 
-          context 'for project master' do
-            let(:role) { :master }
+              it 'shows the terminal button' do
+                expect(page).to have_terminal_button
+              end
+            end
+
+            context 'when user is a developer' do
+              let(:role) { :developer }
 
-            it 'shows the terminal button' do
-              expect(page).to have_terminal_button
+              it 'does not show terminal button' do
+                expect(page).not_to have_terminal_button
+              end
             end
           end
 
-          context 'when user is a developer' do
-            let(:role) { :developer }
+          context 'when user configured kubernetes from Integration > Kubernetes' do
+            let(:project) { create(:kubernetes_project, :test_repo) }
 
-            it 'does not show terminal button' do
-              expect(page).not_to have_terminal_button
-            end
+            it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+          end
+
+          context 'when user configured kubernetes from CI/CD > Clusters' do
+            let(:cluster) { create(:cluster, :provided_by_gcp, projects: [create(:project, :repository)]) }
+            let(:project) { cluster.project }
+
+            it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
           end
         end
       end

spec/lib/gitlab/ci/build/policy/kubernetes_spec.rb

@@ -4,11 +4,24 @@ describe Gitlab::Ci::Build::Policy::Kubernetes do
   let(:pipeline) { create(:ci_pipeline, project: project) }
 
   context 'when kubernetes service is active' do
-    set(:project) { create(:kubernetes_project) }
+    shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+      it 'is satisfied by a kubernetes pipeline' do
+        expect(described_class.new('active'))
+          .to be_satisfied_by(pipeline)
+      end
+    end
 
-    it 'is satisfied by a kubernetes pipeline' do
-      expect(described_class.new('active'))
-        .to be_satisfied_by(pipeline)
+    context 'when user configured kubernetes from Integration > Kubernetes' do
+      let(:project) { create(:kubernetes_project) }
+
+      it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+    end
+
+    context 'when user configured kubernetes from CI/CD > Clusters' do
+      let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+      let(:project) { cluster.project }
+
+      it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
     end
   end
 

spec/lib/gitlab/ci/yaml_processor_spec.rb

@@ -178,15 +178,29 @@ module Gitlab
           end
 
           context 'when kubernetes is active' do
-            let(:project) { create(:kubernetes_project) }
-            let(:pipeline) { create(:ci_empty_pipeline, project: project) }
+            shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+              it 'returns seeds for kubernetes dependent job' do
+                seeds = subject.stage_seeds(pipeline)
 
-            it 'returns seeds for kubernetes dependent job' do
-              seeds = subject.stage_seeds(pipeline)
+                expect(seeds.size).to eq 2
+                expect(seeds.first.builds.dig(0, :name)).to eq 'spinach'
+                expect(seeds.second.builds.dig(0, :name)).to eq 'production'
+              end
+            end
 
-              expect(seeds.size).to eq 2
-              expect(seeds.first.builds.dig(0, :name)).to eq 'spinach'
-              expect(seeds.second.builds.dig(0, :name)).to eq 'production'
+            context 'when user configured kubernetes from Integration > Kubernetes' do
+              let(:project) { create(:kubernetes_project) }
+              let(:pipeline) { create(:ci_empty_pipeline, project: project) }
+
+              it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+            end
+
+            context 'when user configured kubernetes from CI/CD > Clusters' do
+              let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+              let(:project) { cluster.project }
+              let(:pipeline) { create(:ci_empty_pipeline, project: project) }
+
+              it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
             end
           end
 

spec/models/ci/pipeline_spec.rb

@@ -561,10 +561,23 @@ describe Ci::Pipeline, :mailer do
 
   describe '#has_kubernetes_active?' do
     context 'when kubernetes is active' do
-      let(:project) { create(:kubernetes_project) }
+      shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+        it 'returns true' do
+          expect(pipeline).to have_kubernetes_active
+        end
+      end
 
-      it 'returns true' do
-        expect(pipeline).to have_kubernetes_active
+      context 'when user configured kubernetes from Integration > Kubernetes' do
+        let(:project) { create(:kubernetes_project) }
+
+        it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+      end
+
+      context 'when user configured kubernetes from CI/CD > Clusters' do
+        let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+        let(:project) { cluster.project }
+
+        it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
       end
     end
 

spec/models/clusters/cluster_spec.rb

@@ -9,7 +9,6 @@ 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(:update_kubernetes_integration!).to(:platform) }
   it { is_expected.to respond_to :project }
 
   describe '.enabled' do

spec/models/clusters/platforms/kubernetes_spec.rb

@@ -5,6 +5,8 @@ describe Clusters::Platforms::Kubernetes, :use_clean_rails_memory_store_caching
   include ReactiveCachingHelpers
 
   it { is_expected.to belong_to(:cluster) }
+  it { is_expected.to be_kind_of(Gitlab::Kubernetes) }
+  it { is_expected.to be_kind_of(ReactiveCaching) }
   it { is_expected.to respond_to :ca_pem }
 
   describe 'before_validation' do
@@ -90,99 +92,178 @@ describe Clusters::Platforms::Kubernetes, :use_clean_rails_memory_store_caching
     end
   end
 
-  describe 'after_save from Clusters::Cluster' do
-    context 'when platform_kubernetes is being cerated' do
-      let(:enabled) { true }
-      let(:project) { create(:project) }
-      let(:cluster) { build(:cluster, provider_type: :gcp, platform_type: :kubernetes, platform_kubernetes: platform, provider_gcp: provider, enabled: enabled, projects: [project]) }
-      let(:platform) { build(:cluster_platform_kubernetes, :configured) }
-      let(:provider) { build(:cluster_provider_gcp) }
-      let(:kubernetes_service) { project.kubernetes_service }
+  describe '#actual_namespace' do
+    subject { kubernetes.actual_namespace }
 
-      it 'updates KubernetesService' do
-        cluster.save!
+    let!(:cluster) { create(:cluster, :project, platform_kubernetes: kubernetes) }
+    let(:project) { cluster.project }
+    let(:kubernetes) { create(:cluster_platform_kubernetes, :configured, namespace: namespace) }
 
-        expect(kubernetes_service.active).to eq(enabled)
-        expect(kubernetes_service.api_url).to eq(platform.api_url)
-        expect(kubernetes_service.namespace).to eq(platform.namespace)
-        expect(kubernetes_service.ca_pem).to eq(platform.ca_cert)
-      end
+    context 'when namespace is present' do
+      let(:namespace) { 'namespace-123' }
+
+      it { is_expected.to eq(namespace) }
     end
 
-    context 'when platform_kubernetes has been created' do
-      let(:enabled) { false }
-      let!(:project) { create(:project) }
-      let!(:cluster) { create(:cluster, :provided_by_gcp, projects: [project]) }
-      let(:platform) { cluster.platform }
-      let(:kubernetes_service) { project.kubernetes_service }
+    context 'when namespace is not present' do
+      let(:namespace) { nil }
+
+      it { is_expected.to eq("#{project.path}-#{project.id}") }
+    end
+  end
 
-      it 'updates KubernetesService' do
-        cluster.update(enabled: enabled)
+  describe '#default_namespace' do
+    subject { kubernetes.send(:default_namespace) }
 
-        expect(kubernetes_service.active).to eq(enabled)
+    let(:kubernetes) { create(:cluster_platform_kubernetes, :configured) }
+
+    context 'when cluster belongs to a project' do
+      let!(:cluster) { create(:cluster, :project, platform_kubernetes: kubernetes) }
+      let(:project) { cluster.project }
+
+      it { is_expected.to eq("#{project.path}-#{project.id}") }
+    end
+
+    context 'when cluster belongs to nothing' do
+      let!(:cluster) { create(:cluster, platform_kubernetes: kubernetes) }
+
+      it { is_expected.to be_nil }
+    end
+  end
+
+  describe '#predefined_variables' do
+    let!(:cluster) { create(:cluster, :project, platform_kubernetes: kubernetes) }
+    let(:kubernetes) { create(:cluster_platform_kubernetes, api_url: api_url, ca_cert: ca_pem, token: token) }
+    let(:api_url) { 'https://kube.domain.com' }
+    let(:ca_pem) { 'CA PEM DATA' }
+    let(:token) { 'token' }
+
+    let(:kubeconfig) do
+      config_file = expand_fixture_path('config/kubeconfig.yml')
+      config = YAML.load(File.read(config_file))
+      config.dig('users', 0, 'user')['token'] = token
+      config.dig('contexts', 0, 'context')['namespace'] = namespace
+      config.dig('clusters', 0, 'cluster')['certificate-authority-data'] =
+        Base64.strict_encode64(ca_pem)
+
+      YAML.dump(config)
+    end
+
+    shared_examples 'setting variables' do
+      it 'sets the variables' do
+        expect(kubernetes.predefined_variables).to include(
+          { key: 'KUBE_URL', value: api_url, public: true },
+          { key: 'KUBE_TOKEN', value: token, public: false },
+          { key: 'KUBE_NAMESPACE', value: namespace, public: true },
+          { key: 'KUBECONFIG', value: kubeconfig, public: false, file: true },
+          { key: 'KUBE_CA_PEM', value: ca_pem, public: true },
+          { key: 'KUBE_CA_PEM_FILE', value: ca_pem, public: true, file: true }
+        )
       end
     end
 
-    context 'when kubernetes_service has been configured without cluster integration' do
-      let!(:project) { create(:project) }
-      let(:cluster) { build(:cluster, provider_type: :gcp, platform_type: :kubernetes, platform_kubernetes: platform, provider_gcp: provider, projects: [project]) }
-      let(:platform) { build(:cluster_platform_kubernetes, :configured, api_url: 'https://111.111.111.111') }
-      let(:provider) { build(:cluster_provider_gcp) }
+    context 'namespace is provided' do
+      let(:namespace) { 'my-project' }
 
       before do
-        create(:kubernetes_service, project: project)
+        kubernetes.namespace = namespace
       end
 
-      it 'raises an error' do
-        expect { cluster.save! }.to raise_error('Kubernetes service already configured')
+      it_behaves_like 'setting variables'
+    end
+
+    context 'no namespace provided' do
+      let(:namespace) { kubernetes.actual_namespace }
+
+      it_behaves_like 'setting variables'
+
+      it 'sets the KUBE_NAMESPACE' do
+        kube_namespace = kubernetes.predefined_variables.find { |h| h[:key] == 'KUBE_NAMESPACE' }
+
+        expect(kube_namespace).not_to be_nil
+        expect(kube_namespace[:value]).to match(/\A#{Gitlab::PathRegex::PATH_REGEX_STR}-\d+\z/)
       end
     end
   end
 
-  describe '#actual_namespace' do
-    subject { kubernetes.actual_namespace }
+  describe '#terminals' do
+    subject { service.terminals(environment) }
 
-    let!(:cluster) { create(:cluster, :project, platform_kubernetes: kubernetes) }
+    let!(:cluster) { create(:cluster, :project, platform_kubernetes: service) }
     let(:project) { cluster.project }
-    let(:kubernetes) { create(:cluster_platform_kubernetes, :configured, namespace: namespace) }
+    let(:service) { create(:cluster_platform_kubernetes, :configured) }
+    let(:environment) { build(:environment, project: project, name: "env", slug: "env-000000") }
 
-    context 'when namespace is present' do
-      let(:namespace) { 'namespace-123' }
+    context 'with invalid pods' do
+      it 'returns no terminals' do
+        stub_reactive_cache(service, pods: [{ "bad" => "pod" }])
 
-      it { is_expected.to eq(namespace) }
+        is_expected.to be_empty
+      end
     end
 
-    context 'when namespace is not present' do
-      let(:namespace) { nil }
+    context 'with valid pods' do
+      let(:pod) { kube_pod(app: environment.slug) }
+      let(:terminals) { kube_terminals(service, pod) }
 
-      it { is_expected.to eq("#{project.path}-#{project.id}") }
+      before do
+        stub_reactive_cache(
+          service,
+          pods: [pod, pod, kube_pod(app: "should-be-filtered-out")]
+        )
+      end
+
+      it 'returns terminals' do
+        is_expected.to eq(terminals + terminals)
+      end
+
+      it 'uses max session time from settings' do
+        stub_application_setting(terminal_max_session_time: 600)
+
+        times = subject.map { |terminal| terminal[:max_session_time] }
+        expect(times).to eq [600, 600, 600, 600]
+      end
     end
   end
 
-  describe '.namespace_for_project' do
-    subject { described_class.namespace_for_project(project) }
+  describe '#calculate_reactive_cache' do
+    subject { service.calculate_reactive_cache }
 
-    let(:project) { create(:project) }
+    let!(:cluster) { create(:cluster, :project, enabled: enabled, platform_kubernetes: service) }
+    let(:service) { create(:cluster_platform_kubernetes, :configured) }
+    let(:enabled) { true }
 
-    it { is_expected.to eq("#{project.path}-#{project.id}") }
-  end
+    context 'when cluster is disabled' do
+      let(:enabled) { false }
 
-  describe '#default_namespace' do
-    subject { kubernetes.default_namespace }
+      it { is_expected.to be_nil }
+    end
 
-    let(:kubernetes) { create(:cluster_platform_kubernetes, :configured) }
+    context 'when kubernetes responds with valid pods and deployments' do
+      before do
+        stub_kubeclient_pods
+        stub_kubeclient_deployments
+      end
 
-    context 'when cluster belongs to a project' do
-      let!(:cluster) { create(:cluster, :project, platform_kubernetes: kubernetes) }
-      let(:project) { cluster.project }
+      it { is_expected.to eq(pods: [kube_pod], deployments: [kube_deployment]) }
+    end
 
-      it { is_expected.to eq("#{project.path}-#{project.id}") }
+    context 'when kubernetes responds with 500s' do
+      before do
+        stub_kubeclient_pods(status: 500)
+        stub_kubeclient_deployments(status: 500)
+      end
+
+      it { expect { subject }.to raise_error(KubeException) }
     end
 
-    context 'when cluster belongs to nothing' do
-      let!(:cluster) { create(:cluster, platform_kubernetes: kubernetes) }
+    context 'when kubernetes responds with 404s' do
+      before do
+        stub_kubeclient_pods(status: 404)
+        stub_kubeclient_deployments(status: 404)
+      end
 
-      it { is_expected.to be_nil }
+      it { is_expected.to eq(pods: [], deployments: []) }
     end
   end
 end

spec/models/environment_spec.rb

@@ -322,20 +322,33 @@ describe Environment do
     end
   end
 
-  describe '#deployment_service_ready?' do
-    subject { environment.deployment_service_ready? }
+  describe '#has_terminals?' do
+    subject { environment.has_terminals? }
 
     context 'when the enviroment is available' do
       context 'with a deployment service' do
-        let(:project) { create(:kubernetes_project) }
+        shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+          context 'and a deployment' do
+            let!(:deployment) { create(:deployment, environment: environment) }
+            it { is_expected.to be_truthy }
+          end
 
-        context 'and a deployment' do
-          let!(:deployment) { create(:deployment, environment: environment) }
-          it { is_expected.to be_truthy }
+          context 'but no deployments' do
+            it { is_expected.to be_falsy }
+          end
         end
 
-        context 'but no deployments' do
-          it { is_expected.to be_falsy }
+        context 'when user configured kubernetes from Integration > Kubernetes' do
+          let(:project) { create(:kubernetes_project) }
+
+          it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+        end
+
+        context 'when user configured kubernetes from CI/CD > Clusters' do
+          let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+          let(:project) { cluster.project }
+
+          it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
         end
       end
 
@@ -356,26 +369,40 @@ describe Environment do
   end
 
   describe '#terminals' do
-    let(:project) { create(:kubernetes_project) }
     subject { environment.terminals }
 
     context 'when the environment has terminals' do
       before do
-        allow(environment).to receive(:deployment_service_ready?).and_return(true)
+        allow(environment).to receive(:has_terminals?).and_return(true)
+      end
+
+      shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+        it 'returns the terminals from the deployment service' do
+          expect(project.deployment_platform)
+            .to receive(:terminals).with(environment)
+            .and_return(:fake_terminals)
+
+          is_expected.to eq(:fake_terminals)
+        end
       end
 
-      it 'returns the terminals from the deployment service' do
-        expect(project.deployment_service)
-          .to receive(:terminals).with(environment)
-          .and_return(:fake_terminals)
+      context 'when user configured kubernetes from Integration > Kubernetes' do
+        let(:project) { create(:kubernetes_project) }
 
-        is_expected.to eq(:fake_terminals)
+        it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+      end
+
+      context 'when user configured kubernetes from CI/CD > Clusters' do
+        let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+        let(:project) { cluster.project }
+
+        it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
       end
     end
 
     context 'when the environment does not have terminals' do
       before do
-        allow(environment).to receive(:deployment_service_ready?).and_return(false)
+        allow(environment).to receive(:has_terminals?).and_return(false)
       end
 
       it { is_expected.to be_nil }
@@ -383,30 +410,43 @@ describe Environment do
   end
 
   describe '#rollout_status' do
-    let(:project) { create(:kubernetes_project) }
+    shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+      subject { environment.rollout_status }
+
+      context 'when the environment has rollout status' do
+        before do
+          allow(environment).to receive(:has_terminals?).and_return(true)
+        end
 
-    subject { environment.rollout_status }
+        it 'returns the rollout status from the deployment service' do
+          expect(project.deployment_platform)
+            .to receive(:rollout_status).with(environment)
+            .and_return(:fake_rollout_status)
 
-    context 'when the environment has rollout status' do
-      before do
-        allow(environment).to receive(:deployment_service_ready?).and_return(true)
+          is_expected.to eq(:fake_rollout_status)
+        end
       end
 
-      it 'returns the rollout status from the deployment service' do
-        expect(project.deployment_service)
-          .to receive(:rollout_status).with(environment)
-          .and_return(:fake_rollout_status)
+      context 'when the environment does not have rollout status' do
+        before do
+          allow(environment).to receive(:has_terminals?).and_return(false)
+        end
 
-        is_expected.to eq(:fake_rollout_status)
+        it { is_expected.to eq(nil) }
       end
     end
 
-    context 'when the environment does not have rollout status' do
-      before do
-        allow(environment).to receive(:deployment_service_ready?).and_return(false)
-      end
+    context 'when user configured kubernetes from Integration > Kubernetes' do
+      let(:project) { create(:kubernetes_project) }
+
+      it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+    end
+
+    context 'when user configured kubernetes from CI/CD > Clusters' do
+      let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+      let(:project) { cluster.project }
 
-      it { is_expected.to eq(nil) }
+      it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
     end
   end
 

spec/models/project_services/kubernetes_service_spec.rb

@@ -4,8 +4,8 @@ describe KubernetesService, :use_clean_rails_memory_store_caching do
   include KubernetesHelpers
   include ReactiveCachingHelpers
 
-  let(:project) { build_stubbed(:kubernetes_project) }
-  let(:service) { project.kubernetes_service }
+  let(:project) { create(:kubernetes_project) }
+  let(:service) { project.deployment_platform }
 
   describe 'Associations' do
     it { is_expected.to belong_to :project }

spec/models/project_spec.rb

@@ -2365,12 +2365,25 @@ describe Project do
     end
 
     context 'when project has a deployment service' do
-      let(:project) { create(:kubernetes_project) }
+      shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+        it 'returns variables from this service' do
+          expect(project.deployment_variables).to include(
+            { key: 'KUBE_TOKEN', value: project.deployment_platform.token, public: false }
+          )
+        end
+      end
 
-      it 'returns variables from this service' do
-        expect(project.deployment_variables).to include(
-          { key: 'KUBE_TOKEN', value: project.kubernetes_service.token, public: false }
-        )
+      context 'when user configured kubernetes from Integration > Kubernetes' do
+        let(:project) { create(:kubernetes_project) }
+
+        it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+      end
+
+      context 'when user configured kubernetes from CI/CD > Clusters' do
+        let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+        let(:project) { cluster.project }
+
+        it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
       end
     end
   end
@@ -3479,4 +3492,23 @@ describe Project do
       end
     end
   end
+
+  describe '#deployment_platform' do
+    subject { project.deployment_platform }
+
+    let(:project) { create(:project) }
+
+    context 'when user configured kubernetes from Integration > Kubernetes' do
+      let!(:kubernetes_service) { create(:kubernetes_service, project: project) }
+
+      it { is_expected.to eq(kubernetes_service) }
+    end
+
+    context 'when user configured kubernetes from CI/CD > Clusters' do
+      let!(:cluster) { create(:cluster, :provided_by_gcp, projects: [project]) }
+      let(:platform_kubernetes) { cluster.platform_kubernetes }
+
+      it { is_expected.to eq(platform_kubernetes) }
+    end
+  end
 end

spec/serializers/environment_entity_spec.rb

@@ -51,7 +51,7 @@ describe EnvironmentEntity do
   context 'with deployment service ready' do
     before do
       stub_licensed_features(deploy_board: true)
-      allow(environment).to receive(:deployment_service_ready?).and_return(true)
+      allow(environment).to receive(:has_terminals?).and_return(true)
       allow(environment).to receive(:rollout_status).and_return(kube_deployment_rollout_status)
     end
 
@@ -63,7 +63,7 @@ describe EnvironmentEntity do
   context 'when license does not has the GitLab_DeployBoard add-on' do
     before do
       stub_licensed_features(deploy_board: false)
-      allow(environment).to receive(:deployment_service_ready?).and_return(true)
+      allow(environment).to receive(:has_terminals?).and_return(true)
     end
 
     it 'does not expose rollout_status' do

spec/support/prometheus/additional_metrics_shared_examples.rb

@@ -41,16 +41,30 @@ RSpec.shared_examples 'additional metrics query' do
     end
 
     describe 'project has Kubernetes service' do
-      let(:project) { create(:kubernetes_project) }
-      let(:environment) { create(:environment, slug: 'environment-slug', project: project) }
-      let(:kube_namespace) { project.kubernetes_service.actual_namespace }
+      shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
+        let(:environment) { create(:environment, slug: 'environment-slug', project: project) }
+        let(:kube_namespace) { project.deployment_platform.actual_namespace }
 
-      it_behaves_like 'query context containing environment slug and filter'
+        it_behaves_like 'query context containing environment slug and filter'
 
-      it 'query context contains kube_namespace' do
-        expect(subject).to receive(:query_metrics).with(hash_including(kube_namespace: kube_namespace))
+        it 'query context contains kube_namespace' do
+          expect(subject).to receive(:query_metrics).with(hash_including(kube_namespace: kube_namespace))
 
-        subject.query(*query_params)
+          subject.query(*query_params)
+        end
+      end
+
+      context 'when user configured kubernetes from Integration > Kubernetes' do
+        let(:project) { create(:kubernetes_project) }
+
+        it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
+      end
+
+      context 'when user configured kubernetes from CI/CD > Clusters' do
+        let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+        let(:project) { cluster.project }
+
+        it_behaves_like 'same behavior between KubernetesService and Platform::Kubernetes'
       end
     end
 

spec/views/projects/pipelines_settings/_show.html.haml_spec.rb

@@ -35,7 +35,7 @@ describe 'projects/pipelines_settings/_show' do
 
   context 'when kubernetes is active' do
     before do
-      project.build_kubernetes_service(active: true)
+      create(:kubernetes_service, project: project)
     end
 
     context 'when auto devops domain is not defined' do

spec/workers/reactive_caching_worker_spec.rb

 require 'spec_helper'
 
 describe ReactiveCachingWorker do
-  let(:project) { create(:kubernetes_project) }
-  let(:service) { project.deployment_service }
-  subject { described_class.new.perform("KubernetesService", service.id) }
+  let(:service) { project.deployment_platform }
 
   describe '#perform' do
-    it 'calls #exclusively_update_reactive_cache!' do
-      expect_any_instance_of(KubernetesService).to receive(:exclusively_update_reactive_cache!)
+    context 'when user configured kubernetes from Integration > Kubernetes' do
+      let(:project) { create(:kubernetes_project) }
 
-      subject
+      it 'calls #exclusively_update_reactive_cache!' do
+        expect_any_instance_of(KubernetesService).to receive(:exclusively_update_reactive_cache!)
+
+        described_class.new.perform("KubernetesService", service.id)
+      end
+    end
+
+    context 'when user configured kubernetes from CI/CD > Clusters' do
+      let!(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+      let(:project) { cluster.project }
+
+      it 'calls #exclusively_update_reactive_cache!' do
+        expect_any_instance_of(Clusters::Platforms::Kubernetes).to receive(:exclusively_update_reactive_cache!)
+
+        described_class.new.perform("Clusters::Platforms::Kubernetes", service.id)
+      end
     end
   end
 end