controlplane_nodes_test.go

Documentation: k8s.io/kubernetes/test/e2e_kubeadm

     1  /*
     2  Copyright 2019 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package kubeadm
    18  
    19  import (
    20  	"context"
    21  
    22  	corev1 "k8s.io/api/core/v1"
    23  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    24  	"k8s.io/apimachinery/pkg/labels"
    25  	clientset "k8s.io/client-go/kubernetes"
    26  	"k8s.io/kubernetes/test/e2e/framework"
    27  	e2enode "k8s.io/kubernetes/test/e2e/framework/node"
    28  	admissionapi "k8s.io/pod-security-admission/api"
    29  
    30  	"github.com/onsi/ginkgo/v2"
    31  	"github.com/onsi/gomega"
    32  )
    33  
    34  const (
    35  	controlPlaneLabel = "node-role.kubernetes.io/control-plane"
    36  )
    37  
    38  // Define container for all the test specification aimed at verifying
    39  // that kubeadm configures the control-plane node as expected
    40  var _ = Describe("control-plane node", func() {
    41  
    42  	// Get an instance of the k8s test framework
    43  	f := framework.NewDefaultFramework("control-plane node")
    44  	f.NamespacePodSecurityLevel = admissionapi.LevelPrivileged
    45  
    46  	// Tests in this container are not expected to create new objects in the cluster
    47  	// so we are disabling the creation of a namespace in order to get a faster execution
    48  	f.SkipNamespaceCreation = true
    49  
    50  	// Important! please note that this test can't be run on single-node clusters
    51  	// in case you can skip this test with SKIP=multi-node
    52  	ginkgo.It("should be labelled and tainted [multi-node]", func(ctx context.Context) {
    53  		// get all control-plane nodes (and this implicitly checks that node are properly labeled)
    54  		controlPlanes := getControlPlaneNodes(ctx, f.ClientSet)
    55  
    56  		// checks if there is at least one control-plane node
    57  		gomega.Expect(controlPlanes.Items).NotTo(gomega.BeEmpty(), "at least one node with label %s should exist. if you are running test on a single-node cluster, you can skip this test with SKIP=multi-node", controlPlaneLabel)
    58  
    59  		// checks that the control-plane nodes have the expected taints
    60  		for _, cp := range controlPlanes.Items {
    61  			e2enode.ExpectNodeHasTaint(ctx, f.ClientSet, cp.GetName(), &corev1.Taint{Key: controlPlaneLabel, Effect: corev1.TaintEffectNoSchedule})
    62  		}
    63  	})
    64  })
    65  
    66  func getControlPlaneNodes(ctx context.Context, c clientset.Interface) *corev1.NodeList {
    67  	selector := labels.Set{controlPlaneLabel: ""}.AsSelector()
    68  	cpNodes, err := c.CoreV1().Nodes().
    69  		List(ctx, metav1.ListOptions{LabelSelector: selector.String()})
    70  	framework.ExpectNoError(err, "error reading control-plane nodes")
    71  	return cpNodes
    72  }
    73
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