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e2e_node: add a test to verify kubelet fails to create pod if userns …
…isn't supported and the pod requests a user namespace Signed-off-by: Peter Hunt <pehunt@redhat.com>
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//go:build linux | ||
// +build linux | ||
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/* | ||
Copyright 2024 The Kubernetes Authors. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package e2enode | ||
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import ( | ||
"context" | ||
"fmt" | ||
"time" | ||
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"github.com/onsi/gomega" | ||
v1 "k8s.io/api/core/v1" | ||
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
kubefeatures "k8s.io/kubernetes/pkg/features" | ||
kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config" | ||
"k8s.io/kubernetes/test/e2e/framework" | ||
e2epod "k8s.io/kubernetes/test/e2e/framework/pod" | ||
e2eskipper "k8s.io/kubernetes/test/e2e/framework/skipper" | ||
"k8s.io/kubernetes/test/e2e/nodefeature" | ||
imageutils "k8s.io/kubernetes/test/utils/image" | ||
admissionapi "k8s.io/pod-security-admission/api" | ||
) | ||
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var _ = SIGDescribe("UserNamespaces", "[LinuxOnly]", nodefeature.UserNamespacesSupport, framework.WithSerial(), func() { | ||
f := framework.NewDefaultFramework("user-namespace-off-test") | ||
f.NamespacePodSecurityLevel = admissionapi.LevelPrivileged | ||
f.Context("when UserNamespacesSupport=false in the kubelet", func() { | ||
// Turn off UserNamespacesSupport for this test | ||
tempSetCurrentKubeletConfig(f, func(ctx context.Context, initialConfig *kubeletconfig.KubeletConfiguration) { | ||
if initialConfig.FeatureGates == nil { | ||
initialConfig.FeatureGates = make(map[string]bool) | ||
} | ||
initialConfig.FeatureGates[string(kubefeatures.UserNamespacesSupport)] = false | ||
}) | ||
f.It("will fail to create a hostUsers=false pod", func(ctx context.Context) { | ||
if on, ok := serviceFeatureGates[string(kubefeatures.UserNamespacesSupport)]; !ok || !on { | ||
e2eskipper.Skipf("services do not have user namespaces on") | ||
} | ||
falseVar := false | ||
podClient := e2epod.NewPodClient(f) | ||
pod, err := podClient.PodInterface.Create(ctx, &v1.Pod{ | ||
ObjectMeta: metav1.ObjectMeta{Name: "userns-pod"}, | ||
Spec: v1.PodSpec{ | ||
Containers: []v1.Container{ | ||
{ | ||
Name: "test-container-1", | ||
Image: imageutils.GetE2EImage(imageutils.BusyBox), | ||
Command: []string{"/bin/sleep"}, | ||
Args: []string{"10000"}, | ||
}, | ||
}, | ||
HostUsers: &falseVar, | ||
}, | ||
}, metav1.CreateOptions{}) | ||
framework.ExpectNoError(err) | ||
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// Pod should stay in pending | ||
// Events would be a better way to tell this, as we could actually read the event, | ||
// but history proves events aren't reliable enough to base a test on. | ||
gomega.Consistently(ctx, func() error { | ||
p, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(ctx, pod.Name, metav1.GetOptions{}) | ||
if err != nil { | ||
return err | ||
} | ||
if p.Status.Phase != v1.PodPending { | ||
return fmt.Errorf("Pod phase isn't pending") | ||
} | ||
return nil | ||
}, 30*time.Second, 5*time.Second).ShouldNot(gomega.HaveOccurred()) | ||
}) | ||
}) | ||
}) |