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SupportPodPidsLimit feature beta with tests
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/* | ||
Copyright 2019 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 e2e_node | ||
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import ( | ||
"fmt" | ||
"time" | ||
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apiv1 "k8s.io/api/core/v1" | ||
"k8s.io/apimachinery/pkg/api/resource" | ||
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
"k8s.io/apimachinery/pkg/util/uuid" | ||
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kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config" | ||
"k8s.io/kubernetes/pkg/kubelet/cm" | ||
"k8s.io/kubernetes/test/e2e/framework" | ||
imageutils "k8s.io/kubernetes/test/utils/image" | ||
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. "github.com/onsi/ginkgo" | ||
. "github.com/onsi/gomega" | ||
) | ||
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// makePodToVerifyPids returns a pod that verifies specified cgroup with pids | ||
func makePodToVerifyPids(baseName string, pidsLimit resource.Quantity) *apiv1.Pod { | ||
// convert the cgroup name to its literal form | ||
cgroupFsName := "" | ||
cgroupName := cm.NewCgroupName(cm.RootCgroupName, defaultNodeAllocatableCgroup, baseName) | ||
if framework.TestContext.KubeletConfig.CgroupDriver == "systemd" { | ||
cgroupFsName = cgroupName.ToSystemd() | ||
} else { | ||
cgroupFsName = cgroupName.ToCgroupfs() | ||
} | ||
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// this command takes the expected value and compares it against the actual value for the pod cgroup pids.max | ||
command := fmt.Sprintf("expected=%v; actual=$(cat /tmp/pids/%v/pids.max); if [ \"$expected\" -ne \"$actual\" ]; then exit 1; fi; ", pidsLimit.Value(), cgroupFsName) | ||
framework.Logf("Pod to run command: %v", command) | ||
pod := &apiv1.Pod{ | ||
ObjectMeta: metav1.ObjectMeta{ | ||
Name: "pod" + string(uuid.NewUUID()), | ||
}, | ||
Spec: apiv1.PodSpec{ | ||
RestartPolicy: apiv1.RestartPolicyNever, | ||
Containers: []apiv1.Container{ | ||
{ | ||
Image: busyboxImage, | ||
Name: "container" + string(uuid.NewUUID()), | ||
Command: []string{"sh", "-c", command}, | ||
VolumeMounts: []apiv1.VolumeMount{ | ||
{ | ||
Name: "sysfscgroup", | ||
MountPath: "/tmp", | ||
}, | ||
}, | ||
}, | ||
}, | ||
Volumes: []apiv1.Volume{ | ||
{ | ||
Name: "sysfscgroup", | ||
VolumeSource: apiv1.VolumeSource{ | ||
HostPath: &apiv1.HostPathVolumeSource{Path: "/sys/fs/cgroup"}, | ||
}, | ||
}, | ||
}, | ||
}, | ||
} | ||
return pod | ||
} | ||
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// enablePodPidsLimitInKubelet enables pod pid limit feature for kubelet with a sensible default test limit | ||
func enablePodPidsLimitInKubelet(f *framework.Framework) *kubeletconfig.KubeletConfiguration { | ||
oldCfg, err := getCurrentKubeletConfig() | ||
framework.ExpectNoError(err) | ||
newCfg := oldCfg.DeepCopy() | ||
if newCfg.FeatureGates == nil { | ||
newCfg.FeatureGates = make(map[string]bool) | ||
newCfg.FeatureGates["SupportPodPidsLimit"] = true | ||
} | ||
newCfg.PodPidsLimit = int64(1024) | ||
// Update the Kubelet configuration. | ||
framework.ExpectNoError(setKubeletConfiguration(f, newCfg)) | ||
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// Wait for the Kubelet to be ready. | ||
Eventually(func() bool { | ||
nodeList := framework.GetReadySchedulableNodesOrDie(f.ClientSet) | ||
return len(nodeList.Items) == 1 | ||
}, time.Minute, time.Second).Should(BeTrue()) | ||
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return oldCfg | ||
} | ||
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func runPodPidsLimitTests(f *framework.Framework) { | ||
It("should set pids.max for Pod", func() { | ||
By("by creating a G pod") | ||
pod := f.PodClient().Create(&apiv1.Pod{ | ||
ObjectMeta: metav1.ObjectMeta{ | ||
Name: "pod" + string(uuid.NewUUID()), | ||
Namespace: f.Namespace.Name, | ||
}, | ||
Spec: apiv1.PodSpec{ | ||
Containers: []apiv1.Container{ | ||
{ | ||
Image: imageutils.GetPauseImageName(), | ||
Name: "container" + string(uuid.NewUUID()), | ||
Resources: apiv1.ResourceRequirements{ | ||
Limits: apiv1.ResourceList{ | ||
apiv1.ResourceName("cpu"): resource.MustParse("10m"), | ||
apiv1.ResourceName("memory"): resource.MustParse("100Mi"), | ||
}, | ||
}, | ||
}, | ||
}, | ||
}, | ||
}) | ||
podUID := string(pod.UID) | ||
By("checking if the expected pids settings were applied") | ||
verifyPod := makePodToVerifyPids("pod"+podUID, resource.MustParse("1024")) | ||
f.PodClient().Create(verifyPod) | ||
err := framework.WaitForPodSuccessInNamespace(f.ClientSet, verifyPod.Name, f.Namespace.Name) | ||
Expect(err).NotTo(HaveOccurred()) | ||
}) | ||
} | ||
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// Serial because the test updates kubelet configuration. | ||
var _ = SIGDescribe("PodPidsLimit [Serial] [Feature:SupportPodPidsLimit][NodeFeature:SupportPodPidsLimit]", func() { | ||
f := framework.NewDefaultFramework("pids-limit-test") | ||
Context("With config updated with pids feature enabled", func() { | ||
tempSetCurrentKubeletConfig(f, func(initialConfig *kubeletconfig.KubeletConfiguration) { | ||
if initialConfig.FeatureGates == nil { | ||
initialConfig.FeatureGates = make(map[string]bool) | ||
} | ||
initialConfig.FeatureGates["SupportPodPidsLimit"] = true | ||
initialConfig.PodPidsLimit = int64(1024) | ||
}) | ||
runPodPidsLimitTests(f) | ||
}) | ||
}) |