mirror of
https://github.com/k3s-io/kubernetes.git
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cff9ecd317
Restart the kubelet and wait for hugepages resources to appear under the node. Signed-off-by: Artyom Lukianov <alukiano@redhat.com>
611 lines
18 KiB
Go
611 lines
18 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package e2enode
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import (
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"context"
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"encoding/json"
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"fmt"
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"os"
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"os/exec"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"time"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/resource"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config"
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"k8s.io/kubernetes/pkg/kubelet/cm/cpuset"
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"k8s.io/kubernetes/pkg/kubelet/cm/memorymanager/state"
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"k8s.io/kubernetes/test/e2e/framework"
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e2enode "k8s.io/kubernetes/test/e2e/framework/node"
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e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
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"k8s.io/utils/pointer"
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"github.com/onsi/ginkgo"
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"github.com/onsi/gomega"
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)
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const (
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evictionHardMemory = "memory.available"
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memoryManagerStateFile = "/var/lib/kubelet/memory_manager_state"
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resourceMemory = "memory"
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staticPolicy = "Static"
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nonePolicy = "None"
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)
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// Helper for makeMemoryManagerPod().
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type memoryManagerCtnAttributes struct {
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ctnName string
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cpus string
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memory string
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hugepages2Mi string
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}
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// makeMemoryManagerContainers returns slice of containers with provided attributes and indicator of hugepages mount needed for those.
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func makeMemoryManagerContainers(ctnCmd string, ctnAttributes []memoryManagerCtnAttributes) ([]v1.Container, bool) {
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hugepagesMount := false
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var containers []v1.Container
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for _, ctnAttr := range ctnAttributes {
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ctn := v1.Container{
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Name: ctnAttr.ctnName,
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Image: busyboxImage,
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Resources: v1.ResourceRequirements{
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Limits: v1.ResourceList{
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v1.ResourceCPU: resource.MustParse(ctnAttr.cpus),
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v1.ResourceMemory: resource.MustParse(ctnAttr.memory),
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},
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},
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Command: []string{"sh", "-c", ctnCmd},
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}
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if ctnAttr.hugepages2Mi != "" {
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hugepagesMount = true
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ctn.Resources.Limits[hugepagesResourceName2Mi] = resource.MustParse(ctnAttr.hugepages2Mi)
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ctn.VolumeMounts = []v1.VolumeMount{
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{
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Name: "hugepages-2mi",
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MountPath: "/hugepages-2Mi",
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},
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}
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}
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containers = append(containers, ctn)
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}
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return containers, hugepagesMount
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}
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// makeMemoryMangerPod returns a pod with the provided ctnAttributes.
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func makeMemoryManagerPod(podName string, initCtnAttributes, ctnAttributes []memoryManagerCtnAttributes) *v1.Pod {
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hugepagesMount := false
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memsetCmd := "grep Mems_allowed_list /proc/self/status | cut -f2"
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memsetSleepCmd := memsetCmd + "&& sleep 1d"
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var containers, initContainers []v1.Container
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if len(initCtnAttributes) > 0 {
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initContainers, _ = makeMemoryManagerContainers(memsetCmd, initCtnAttributes)
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}
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containers, hugepagesMount = makeMemoryManagerContainers(memsetSleepCmd, ctnAttributes)
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pod := &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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GenerateName: podName,
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},
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Spec: v1.PodSpec{
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RestartPolicy: v1.RestartPolicyNever,
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Containers: containers,
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InitContainers: initContainers,
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},
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}
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if hugepagesMount {
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pod.Spec.Volumes = []v1.Volume{
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{
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Name: "hugepages-2mi",
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VolumeSource: v1.VolumeSource{
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EmptyDir: &v1.EmptyDirVolumeSource{
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Medium: mediumHugepages2Mi,
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},
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},
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},
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}
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}
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return pod
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}
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func deleteMemoryManagerStateFile() {
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err := exec.Command("/bin/sh", "-c", fmt.Sprintf("rm -f %s", memoryManagerStateFile)).Run()
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framework.ExpectNoError(err, "failed to delete the state file")
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}
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func getMemoryManagerState() (*state.MemoryManagerCheckpoint, error) {
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if _, err := os.Stat(memoryManagerStateFile); os.IsNotExist(err) {
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return nil, fmt.Errorf("the memory manager state file %s does not exist", memoryManagerStateFile)
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}
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out, err := exec.Command("/bin/sh", "-c", fmt.Sprintf("cat %s", memoryManagerStateFile)).Output()
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if err != nil {
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return nil, fmt.Errorf("failed to run command 'cat %s': out: %s, err: %v", memoryManagerStateFile, out, err)
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}
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memoryManagerCheckpoint := &state.MemoryManagerCheckpoint{}
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if err := json.Unmarshal(out, memoryManagerCheckpoint); err != nil {
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return nil, fmt.Errorf("failed to unmarshal memory manager state file: %v", err)
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}
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return memoryManagerCheckpoint, nil
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}
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type kubeletParams struct {
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memoryManagerFeatureGate bool
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memoryManagerPolicy string
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systemReservedMemory []kubeletconfig.MemoryReservation
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systemReserved map[string]string
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kubeReserved map[string]string
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evictionHard map[string]string
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}
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func getUpdatedKubeletConfig(oldCfg *kubeletconfig.KubeletConfiguration, params *kubeletParams) *kubeletconfig.KubeletConfiguration {
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newCfg := oldCfg.DeepCopy()
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if newCfg.FeatureGates == nil {
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newCfg.FeatureGates = map[string]bool{}
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}
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newCfg.FeatureGates["MemoryManager"] = params.memoryManagerFeatureGate
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newCfg.MemoryManagerPolicy = params.memoryManagerPolicy
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// update system-reserved
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if newCfg.SystemReserved == nil {
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newCfg.SystemReserved = map[string]string{}
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}
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for resourceName, value := range params.systemReserved {
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newCfg.SystemReserved[resourceName] = value
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}
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// update kube-reserved
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if newCfg.KubeReserved == nil {
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newCfg.KubeReserved = map[string]string{}
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}
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for resourceName, value := range params.kubeReserved {
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newCfg.KubeReserved[resourceName] = value
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}
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// update hard eviction threshold
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if newCfg.EvictionHard == nil {
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newCfg.EvictionHard = map[string]string{}
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}
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for resourceName, value := range params.evictionHard {
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newCfg.EvictionHard[resourceName] = value
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}
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// update reserved memory
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if newCfg.ReservedMemory == nil {
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newCfg.ReservedMemory = []kubeletconfig.MemoryReservation{}
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}
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for _, memoryReservation := range params.systemReservedMemory {
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newCfg.ReservedMemory = append(newCfg.ReservedMemory, memoryReservation)
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}
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return newCfg
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}
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func updateKubeletConfig(f *framework.Framework, cfg *kubeletconfig.KubeletConfiguration) {
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// remove the state file
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deleteMemoryManagerStateFile()
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// Update the Kubelet configuration
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framework.ExpectNoError(setKubeletConfiguration(f, cfg))
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// Wait for the Kubelet to be ready.
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gomega.Eventually(func() bool {
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nodes, err := e2enode.TotalReady(f.ClientSet)
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framework.ExpectNoError(err)
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return nodes == 1
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}, time.Minute, time.Second).Should(gomega.BeTrue())
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}
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func getAllNUMANodes() []int {
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outData, err := exec.Command("/bin/sh", "-c", "lscpu").Output()
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framework.ExpectNoError(err)
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numaNodeRegex, err := regexp.Compile(`NUMA node(\d+) CPU\(s\):`)
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framework.ExpectNoError(err)
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matches := numaNodeRegex.FindAllSubmatch(outData, -1)
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var numaNodes []int
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for _, m := range matches {
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n, err := strconv.Atoi(string(m[1]))
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framework.ExpectNoError(err)
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numaNodes = append(numaNodes, n)
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}
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sort.Ints(numaNodes)
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return numaNodes
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}
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// Serial because the test updates kubelet configuration.
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var _ = SIGDescribe("Memory Manager [Serial] [Feature:MemoryManager][NodeAlphaFeature:MemoryManager]", func() {
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// TODO: add more complex tests that will include interaction between CPUManager, MemoryManager and TopologyManager
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var (
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allNUMANodes []int
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ctnParams, initCtnParams []memoryManagerCtnAttributes
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is2MiHugepagesSupported *bool
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isMultiNUMASupported *bool
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kubeParams *kubeletParams
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oldCfg *kubeletconfig.KubeletConfiguration
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testPod *v1.Pod
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)
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f := framework.NewDefaultFramework("memory-manager-test")
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memoryQuantatity := resource.MustParse("1100Mi")
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defaultKubeParams := &kubeletParams{
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memoryManagerFeatureGate: true,
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systemReservedMemory: []kubeletconfig.MemoryReservation{
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{
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NumaNode: 0,
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Limits: v1.ResourceList{
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resourceMemory: memoryQuantatity,
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},
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},
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},
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systemReserved: map[string]string{resourceMemory: "500Mi"},
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kubeReserved: map[string]string{resourceMemory: "500Mi"},
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evictionHard: map[string]string{evictionHardMemory: "100Mi"},
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}
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verifyMemoryPinning := func(pod *v1.Pod, numaNodeIDs []int) {
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ginkgo.By("Verifying the NUMA pinning")
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output, err := e2epod.GetPodLogs(f.ClientSet, f.Namespace.Name, pod.Name, pod.Spec.Containers[0].Name)
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framework.ExpectNoError(err)
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currentNUMANodeIDs, err := cpuset.Parse(strings.Trim(output, "\n"))
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framework.ExpectNoError(err)
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framework.ExpectEqual(numaNodeIDs, currentNUMANodeIDs.ToSlice())
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}
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ginkgo.BeforeEach(func() {
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if isMultiNUMASupported == nil {
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isMultiNUMASupported = pointer.BoolPtr(isMultiNUMA())
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}
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if is2MiHugepagesSupported == nil {
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is2MiHugepagesSupported = pointer.BoolPtr(isHugePageAvailable(hugepagesSize2M))
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}
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if len(allNUMANodes) == 0 {
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allNUMANodes = getAllNUMANodes()
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}
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})
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// dynamically update the kubelet configuration
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ginkgo.JustBeforeEach(func() {
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var err error
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// allocate hugepages
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if *is2MiHugepagesSupported {
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hugepagesCount := 256
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ginkgo.By("Configuring hugepages")
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gomega.Eventually(func() error {
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if err := configureHugePages(hugepagesSize2M, hugepagesCount); err != nil {
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return err
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}
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return nil
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}, 30*time.Second, framework.Poll).Should(gomega.BeNil())
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ginkgo.By("restarting kubelet to pick up pre-allocated hugepages")
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// stop the kubelet and wait until the server will restart it automatically
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stopKubelet()
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// wait until the kubelet health check will fail
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gomega.Eventually(func() bool {
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return kubeletHealthCheck(kubeletHealthCheckURL)
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}, time.Minute, time.Second).Should(gomega.BeFalse())
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// wait until the kubelet health check will pass
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gomega.Eventually(func() bool {
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return kubeletHealthCheck(kubeletHealthCheckURL)
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}, 2*time.Minute, 10*time.Second).Should(gomega.BeTrue())
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ginkgo.By("Waiting for hugepages resource to become available on the local node")
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gomega.Eventually(func() error {
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node, err := f.ClientSet.CoreV1().Nodes().Get(context.TODO(), framework.TestContext.NodeName, metav1.GetOptions{})
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if err != nil {
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return err
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}
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capacity, ok := node.Status.Capacity[v1.ResourceName(hugepagesResourceName2Mi)]
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if !ok {
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return fmt.Errorf("the node does not have the resource %s", hugepagesResourceName2Mi)
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}
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size, succeed := capacity.AsInt64()
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if !succeed {
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return fmt.Errorf("failed to convert quantity to int64")
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}
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// 512 Mb, the expected size in bytes
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expectedSize := int64(hugepagesCount * hugepagesSize2M * 1024)
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if size != expectedSize {
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return fmt.Errorf("the actual size %d is different from the expected one %d", size, expectedSize)
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}
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return nil
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}, time.Minute, framework.Poll).Should(gomega.BeNil())
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}
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// get the old kubelet config
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oldCfg, err = getCurrentKubeletConfig()
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framework.ExpectNoError(err)
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// update the kubelet config with new parameters
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newCfg := getUpdatedKubeletConfig(oldCfg, kubeParams)
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updateKubeletConfig(f, newCfg)
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// request hugepages resources under the container
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if *is2MiHugepagesSupported {
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for i := 0; i < len(ctnParams); i++ {
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ctnParams[i].hugepages2Mi = "128Mi"
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}
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}
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testPod = makeMemoryManagerPod(ctnParams[0].ctnName, initCtnParams, ctnParams)
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})
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ginkgo.JustAfterEach(func() {
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// delete the test pod
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if testPod.Name != "" {
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f.PodClient().DeleteSync(testPod.Name, metav1.DeleteOptions{}, 2*time.Minute)
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}
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// release hugepages
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gomega.Eventually(func() error {
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return configureHugePages(hugepagesSize2M, 0)
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}, 90*time.Second, 15*time.Second).ShouldNot(gomega.HaveOccurred(), "failed to release hugepages")
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// update the kubelet config with old values
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updateKubeletConfig(f, oldCfg)
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})
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ginkgo.Context("with static policy", func() {
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ginkgo.BeforeEach(func() {
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// override kubelet configuration parameters
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tmpParams := *defaultKubeParams
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tmpParams.memoryManagerPolicy = staticPolicy
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kubeParams = &tmpParams
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})
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ginkgo.JustAfterEach(func() {
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// reset containers attributes
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ctnParams = []memoryManagerCtnAttributes{}
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initCtnParams = []memoryManagerCtnAttributes{}
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})
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ginkgo.When("guaranteed pod has init and app containers", func() {
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ginkgo.BeforeEach(func() {
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// override containers parameters
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ctnParams = []memoryManagerCtnAttributes{
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{
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ctnName: "memory-manager-static",
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cpus: "100m",
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memory: "128Mi",
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},
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}
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// override init container parameters
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initCtnParams = []memoryManagerCtnAttributes{
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{
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ctnName: "init-memory-manager-static",
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cpus: "100m",
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memory: "128Mi",
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},
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}
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})
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ginkgo.It("should succeed to start the pod", func() {
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ginkgo.By("Running the test pod")
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testPod = f.PodClient().CreateSync(testPod)
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// it no taste to verify NUMA pinning when the node has only one NUMA node
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if !*isMultiNUMASupported {
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return
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}
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verifyMemoryPinning(testPod, []int{0})
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})
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})
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ginkgo.When("guaranteed pod has only app containers", func() {
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ginkgo.BeforeEach(func() {
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// override containers parameters
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ctnParams = []memoryManagerCtnAttributes{
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{
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ctnName: "memory-manager-static",
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cpus: "100m",
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memory: "128Mi",
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},
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}
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})
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ginkgo.It("should succeed to start the pod", func() {
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ginkgo.By("Running the test pod")
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testPod = f.PodClient().CreateSync(testPod)
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// it no taste to verify NUMA pinning when the node has only one NUMA node
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if !*isMultiNUMASupported {
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return
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}
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verifyMemoryPinning(testPod, []int{0})
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})
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})
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ginkgo.When("multiple guaranteed pods started", func() {
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var testPod2 *v1.Pod
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ginkgo.BeforeEach(func() {
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// override containers parameters
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ctnParams = []memoryManagerCtnAttributes{
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{
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ctnName: "memory-manager-static",
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cpus: "100m",
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memory: "128Mi",
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},
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}
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})
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ginkgo.JustBeforeEach(func() {
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testPod2 = makeMemoryManagerPod("memory-manager-static", initCtnParams, ctnParams)
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})
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ginkgo.It("should succeed to start all pods", func() {
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ginkgo.By("Running the test pod and the test pod 2")
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testPod = f.PodClient().CreateSync(testPod)
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ginkgo.By("Running the test pod 2")
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testPod2 = f.PodClient().CreateSync(testPod2)
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// it no taste to verify NUMA pinning when the node has only one NUMA node
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if !*isMultiNUMASupported {
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return
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}
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verifyMemoryPinning(testPod, []int{0})
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verifyMemoryPinning(testPod2, []int{0})
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})
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ginkgo.JustAfterEach(func() {
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// delete the test pod 2
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if testPod2.Name != "" {
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f.PodClient().DeleteSync(testPod2.Name, metav1.DeleteOptions{}, 2*time.Minute)
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}
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})
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})
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// the test requires at least two NUMA nodes
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// test on each NUMA node will start the pod that will consume almost all memory of the NUMA node except 256Mi
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// after it will start an additional pod with the memory request that can not be satisfied by the single NUMA node
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// free memory
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ginkgo.When("guaranteed pod memory request is bigger than free memory on each NUMA node", func() {
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var workloadPods []*v1.Pod
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ginkgo.BeforeEach(func() {
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if !*isMultiNUMASupported {
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ginkgo.Skip("The machines has less than two NUMA nodes")
|
|
}
|
|
|
|
ctnParams = []memoryManagerCtnAttributes{
|
|
{
|
|
ctnName: "memory-manager-static",
|
|
cpus: "100m",
|
|
memory: "384Mi",
|
|
},
|
|
}
|
|
})
|
|
|
|
ginkgo.JustBeforeEach(func() {
|
|
stateData, err := getMemoryManagerState()
|
|
framework.ExpectNoError(err)
|
|
|
|
for _, memoryState := range stateData.MachineState {
|
|
// consume all memory except of 256Mi on each NUMA node via workload pods
|
|
workloadPodMemory := memoryState.MemoryMap[v1.ResourceMemory].Free - 256*1024*1024
|
|
memoryQuantity := resource.NewQuantity(int64(workloadPodMemory), resource.BinarySI)
|
|
workloadCtnAttrs := []memoryManagerCtnAttributes{
|
|
{
|
|
ctnName: "workload-pod",
|
|
cpus: "100m",
|
|
memory: memoryQuantity.String(),
|
|
},
|
|
}
|
|
workloadPod := makeMemoryManagerPod(workloadCtnAttrs[0].ctnName, initCtnParams, workloadCtnAttrs)
|
|
|
|
workloadPod = f.PodClient().CreateSync(workloadPod)
|
|
workloadPods = append(workloadPods, workloadPod)
|
|
}
|
|
})
|
|
|
|
ginkgo.It("should be rejected", func() {
|
|
ginkgo.By("Creating the pod")
|
|
testPod = f.PodClient().Create(testPod)
|
|
|
|
ginkgo.By("Checking that pod failed to start because of admission error")
|
|
gomega.Eventually(func() bool {
|
|
tmpPod, err := f.PodClient().Get(context.TODO(), testPod.Name, metav1.GetOptions{})
|
|
framework.ExpectNoError(err)
|
|
|
|
if tmpPod.Status.Phase != v1.PodFailed {
|
|
return false
|
|
}
|
|
|
|
if tmpPod.Status.Reason != "UnexpectedAdmissionError" {
|
|
return false
|
|
}
|
|
|
|
if !strings.Contains(tmpPod.Status.Message, "Pod Allocate failed due to [memorymanager]") {
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}, time.Minute, 5*time.Second).Should(
|
|
gomega.Equal(true),
|
|
"the pod succeeded to start, when it should fail with the admission error",
|
|
)
|
|
})
|
|
|
|
ginkgo.JustAfterEach(func() {
|
|
for _, workloadPod := range workloadPods {
|
|
if workloadPod.Name != "" {
|
|
f.PodClient().DeleteSync(workloadPod.Name, metav1.DeleteOptions{}, 2*time.Minute)
|
|
}
|
|
}
|
|
})
|
|
})
|
|
})
|
|
|
|
ginkgo.Context("with none policy", func() {
|
|
ginkgo.BeforeEach(func() {
|
|
tmpParams := *defaultKubeParams
|
|
tmpParams.memoryManagerPolicy = nonePolicy
|
|
kubeParams = &tmpParams
|
|
|
|
// override pod parameters
|
|
ctnParams = []memoryManagerCtnAttributes{
|
|
{
|
|
ctnName: "memory-manager-none",
|
|
cpus: "100m",
|
|
memory: "128Mi",
|
|
},
|
|
}
|
|
})
|
|
|
|
ginkgo.It("should succeed to start the pod", func() {
|
|
testPod = f.PodClient().CreateSync(testPod)
|
|
|
|
// it no taste to verify NUMA pinning when the node has only one NUMA node
|
|
if !*isMultiNUMASupported {
|
|
return
|
|
}
|
|
|
|
verifyMemoryPinning(testPod, allNUMANodes)
|
|
})
|
|
})
|
|
})
|