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kubelet_pods.go
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kubelet_pods.go
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/*
Copyright 2016 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.
*/
package kubelet
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"runtime"
"sort"
"strings"
"sync"
"time"
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
utilvalidation "k8s.io/apimachinery/pkg/util/validation"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/client-go/tools/remotecommand"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/v1"
v1helper "k8s.io/kubernetes/pkg/api/v1/helper"
v1qos "k8s.io/kubernetes/pkg/api/v1/helper/qos"
podutil "k8s.io/kubernetes/pkg/api/v1/pod"
"k8s.io/kubernetes/pkg/api/v1/resource"
"k8s.io/kubernetes/pkg/api/v1/validation"
"k8s.io/kubernetes/pkg/fieldpath"
"k8s.io/kubernetes/pkg/kubelet/cm"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/envvars"
"k8s.io/kubernetes/pkg/kubelet/images"
"k8s.io/kubernetes/pkg/kubelet/server/portforward"
remotecommandserver "k8s.io/kubernetes/pkg/kubelet/server/remotecommand"
"k8s.io/kubernetes/pkg/kubelet/status"
kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
"k8s.io/kubernetes/pkg/kubelet/util/format"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/util/volumehelper"
volumevalidation "k8s.io/kubernetes/pkg/volume/validation"
"k8s.io/kubernetes/third_party/forked/golang/expansion"
)
// Get a list of pods that have data directories.
func (kl *Kubelet) listPodsFromDisk() ([]types.UID, error) {
podInfos, err := ioutil.ReadDir(kl.getPodsDir())
if err != nil {
return nil, err
}
pods := []types.UID{}
for i := range podInfos {
if podInfos[i].IsDir() {
pods = append(pods, types.UID(podInfos[i].Name()))
}
}
return pods, nil
}
// GetActivePods returns non-terminal pods
func (kl *Kubelet) GetActivePods() []*v1.Pod {
allPods := kl.podManager.GetPods()
activePods := kl.filterOutTerminatedPods(allPods)
return activePods
}
// makeDevices determines the devices for the given container.
// Experimental.
func (kl *Kubelet) makeDevices(pod *v1.Pod, container *v1.Container) ([]kubecontainer.DeviceInfo, error) {
if container.Resources.Limits.NvidiaGPU().IsZero() {
return nil, nil
}
nvidiaGPUPaths, err := kl.gpuManager.AllocateGPU(pod, container)
if err != nil {
return nil, err
}
var devices []kubecontainer.DeviceInfo
for _, path := range nvidiaGPUPaths {
// Devices have to be mapped one to one because of nvidia CUDA library requirements.
devices = append(devices, kubecontainer.DeviceInfo{PathOnHost: path, PathInContainer: path, Permissions: "mrw"})
}
return devices, nil
}
// makeMounts determines the mount points for the given container.
func makeMounts(pod *v1.Pod, podDir string, container *v1.Container, hostName, hostDomain, podIP string, podVolumes kubecontainer.VolumeMap) ([]kubecontainer.Mount, error) {
// Kubernetes only mounts on /etc/hosts if :
// - container does not use hostNetwork and
// - container is not an infrastructure(pause) container
// - container is not already mounting on /etc/hosts
// When the pause container is being created, its IP is still unknown. Hence, PodIP will not have been set.
// OS is not Windows
mountEtcHostsFile := !pod.Spec.HostNetwork && len(podIP) > 0 && runtime.GOOS != "windows"
glog.V(3).Infof("container: %v/%v/%v podIP: %q creating hosts mount: %v", pod.Namespace, pod.Name, container.Name, podIP, mountEtcHostsFile)
mounts := []kubecontainer.Mount{}
for _, mount := range container.VolumeMounts {
mountEtcHostsFile = mountEtcHostsFile && (mount.MountPath != etcHostsPath)
vol, ok := podVolumes[mount.Name]
if !ok || vol.Mounter == nil {
glog.Warningf("Mount cannot be satisfied for container %q, because the volume is missing or the volume mounter is nil: %q", container.Name, mount)
continue
}
relabelVolume := false
// If the volume supports SELinux and it has not been
// relabeled already and it is not a read-only volume,
// relabel it and mark it as labeled
if vol.Mounter.GetAttributes().Managed && vol.Mounter.GetAttributes().SupportsSELinux && !vol.SELinuxLabeled {
vol.SELinuxLabeled = true
relabelVolume = true
}
hostPath, err := volume.GetPath(vol.Mounter)
if err != nil {
return nil, err
}
if mount.SubPath != "" {
if filepath.IsAbs(mount.SubPath) {
return nil, fmt.Errorf("error SubPath `%s` must not be an absolute path", mount.SubPath)
}
err = volumevalidation.ValidatePathNoBacksteps(mount.SubPath)
if err != nil {
return nil, fmt.Errorf("unable to provision SubPath `%s`: %v", mount.SubPath, err)
}
fileinfo, err := os.Lstat(hostPath)
if err != nil {
return nil, err
}
perm := fileinfo.Mode()
hostPath = filepath.Join(hostPath, mount.SubPath)
if subPathExists, err := util.FileExists(hostPath); err != nil {
glog.Errorf("Could not determine if subPath %s exists; will not attempt to change its permissions", hostPath)
} else if !subPathExists {
// Create the sub path now because if it's auto-created later when referenced, it may have an
// incorrect ownership and mode. For example, the sub path directory must have at least g+rwx
// when the pod specifies an fsGroup, and if the directory is not created here, Docker will
// later auto-create it with the incorrect mode 0750
if err := os.MkdirAll(hostPath, perm); err != nil {
glog.Errorf("failed to mkdir:%s", hostPath)
return nil, err
}
// chmod the sub path because umask may have prevented us from making the sub path with the same
// permissions as the mounter path
if err := os.Chmod(hostPath, perm); err != nil {
return nil, err
}
}
}
// Docker Volume Mounts fail on Windows if it is not of the form C:/
containerPath := mount.MountPath
if runtime.GOOS == "windows" {
if (strings.HasPrefix(hostPath, "/") || strings.HasPrefix(hostPath, "\\")) && !strings.Contains(hostPath, ":") {
hostPath = "c:" + hostPath
}
if (strings.HasPrefix(containerPath, "/") || strings.HasPrefix(containerPath, "\\")) && !strings.Contains(containerPath, ":") {
containerPath = "c:" + containerPath
}
}
mounts = append(mounts, kubecontainer.Mount{
Name: mount.Name,
ContainerPath: containerPath,
HostPath: hostPath,
ReadOnly: mount.ReadOnly,
SELinuxRelabel: relabelVolume,
})
}
if mountEtcHostsFile {
hostAliases := pod.Spec.HostAliases
hostsMount, err := makeHostsMount(podDir, podIP, hostName, hostDomain, hostAliases)
if err != nil {
return nil, err
}
mounts = append(mounts, *hostsMount)
}
return mounts, nil
}
// makeHostsMount makes the mountpoint for the hosts file that the containers
// in a pod are injected with.
func makeHostsMount(podDir, podIP, hostName, hostDomainName string, hostAliases []v1.HostAlias) (*kubecontainer.Mount, error) {
hostsFilePath := path.Join(podDir, "etc-hosts")
if err := ensureHostsFile(hostsFilePath, podIP, hostName, hostDomainName, hostAliases); err != nil {
return nil, err
}
return &kubecontainer.Mount{
Name: "k8s-managed-etc-hosts",
ContainerPath: etcHostsPath,
HostPath: hostsFilePath,
ReadOnly: false,
SELinuxRelabel: true,
}, nil
}
// ensureHostsFile ensures that the given host file has an up-to-date ip, host
// name, and domain name.
func ensureHostsFile(fileName, hostIP, hostName, hostDomainName string, hostAliases []v1.HostAlias) error {
content := hostsFileContent(hostIP, hostName, hostDomainName, hostAliases)
return ioutil.WriteFile(fileName, content, 0644)
}
// hostsFileContent is the content of the managed etc hosts
func hostsFileContent(hostIP, hostName, hostDomainName string, hostAliases []v1.HostAlias) []byte {
var buffer bytes.Buffer
buffer.WriteString("# Kubernetes-managed hosts file.\n")
buffer.WriteString("127.0.0.1\tlocalhost\n") // ipv4 localhost
buffer.WriteString("::1\tlocalhost ip6-localhost ip6-loopback\n") // ipv6 localhost
buffer.WriteString("fe00::0\tip6-localnet\n")
buffer.WriteString("fe00::0\tip6-mcastprefix\n")
buffer.WriteString("fe00::1\tip6-allnodes\n")
buffer.WriteString("fe00::2\tip6-allrouters\n")
if len(hostDomainName) > 0 {
buffer.WriteString(fmt.Sprintf("%s\t%s.%s\t%s\n", hostIP, hostName, hostDomainName, hostName))
} else {
buffer.WriteString(fmt.Sprintf("%s\t%s\n", hostIP, hostName))
}
// write each IP/hostname pair as an entry into hosts file
for _, hostAlias := range hostAliases {
for _, hostname := range hostAlias.Hostnames {
buffer.WriteString(fmt.Sprintf("%s\t%s\n", hostAlias.IP, hostname))
}
}
return buffer.Bytes()
}
// truncatePodHostnameIfNeeded truncates the pod hostname if it's longer than 63 chars.
func truncatePodHostnameIfNeeded(podName, hostname string) (string, error) {
// Cap hostname at 63 chars (specification is 64bytes which is 63 chars and the null terminating char).
const hostnameMaxLen = 63
if len(hostname) <= hostnameMaxLen {
return hostname, nil
}
truncated := hostname[:hostnameMaxLen]
glog.Errorf("hostname for pod:%q was longer than %d. Truncated hostname to :%q", podName, hostnameMaxLen, truncated)
// hostname should not end with '-' or '.'
truncated = strings.TrimRight(truncated, "-.")
if len(truncated) == 0 {
// This should never happen.
return "", fmt.Errorf("hostname for pod %q was invalid: %q", podName, hostname)
}
return truncated, nil
}
// GeneratePodHostNameAndDomain creates a hostname and domain name for a pod,
// given that pod's spec and annotations or returns an error.
func (kl *Kubelet) GeneratePodHostNameAndDomain(pod *v1.Pod) (string, string, error) {
// TODO(vmarmol): Handle better.
clusterDomain := kl.clusterDomain
hostname := pod.Name
if len(pod.Spec.Hostname) > 0 {
if msgs := utilvalidation.IsDNS1123Label(pod.Spec.Hostname); len(msgs) != 0 {
return "", "", fmt.Errorf("Pod Hostname %q is not a valid DNS label: %s", pod.Spec.Hostname, strings.Join(msgs, ";"))
}
hostname = pod.Spec.Hostname
}
hostname, err := truncatePodHostnameIfNeeded(pod.Name, hostname)
if err != nil {
return "", "", err
}
hostDomain := ""
if len(pod.Spec.Subdomain) > 0 {
if msgs := utilvalidation.IsDNS1123Label(pod.Spec.Subdomain); len(msgs) != 0 {
return "", "", fmt.Errorf("Pod Subdomain %q is not a valid DNS label: %s", pod.Spec.Subdomain, strings.Join(msgs, ";"))
}
hostDomain = fmt.Sprintf("%s.%s.svc.%s", pod.Spec.Subdomain, pod.Namespace, clusterDomain)
}
return hostname, hostDomain, nil
}
// GetPodCgroupParent gets pod cgroup parent from container manager.
func (kl *Kubelet) GetPodCgroupParent(pod *v1.Pod) string {
pcm := kl.containerManager.NewPodContainerManager()
_, cgroupParent := pcm.GetPodContainerName(pod)
return cgroupParent
}
// GenerateRunContainerOptions generates the RunContainerOptions, which can be used by
// the container runtime to set parameters for launching a container.
func (kl *Kubelet) GenerateRunContainerOptions(pod *v1.Pod, container *v1.Container, podIP string) (*kubecontainer.RunContainerOptions, bool, error) {
var err error
useClusterFirstPolicy := false
cgroupParent := kl.GetPodCgroupParent(pod)
opts := &kubecontainer.RunContainerOptions{CgroupParent: cgroupParent}
hostname, hostDomainName, err := kl.GeneratePodHostNameAndDomain(pod)
if err != nil {
return nil, false, err
}
opts.Hostname = hostname
podName := volumehelper.GetUniquePodName(pod)
volumes := kl.volumeManager.GetMountedVolumesForPod(podName)
opts.PortMappings = kubecontainer.MakePortMappings(container)
// TODO(random-liu): Move following convert functions into pkg/kubelet/container
opts.Devices, err = kl.makeDevices(pod, container)
if err != nil {
return nil, false, err
}
opts.Mounts, err = makeMounts(pod, kl.getPodDir(pod.UID), container, hostname, hostDomainName, podIP, volumes)
if err != nil {
return nil, false, err
}
opts.Envs, err = kl.makeEnvironmentVariables(pod, container, podIP)
if err != nil {
return nil, false, err
}
// Disabling adding TerminationMessagePath on Windows as these files would be mounted as docker volume and
// Docker for Windows has a bug where only directories can be mounted
if len(container.TerminationMessagePath) != 0 && runtime.GOOS != "windows" {
p := kl.getPodContainerDir(pod.UID, container.Name)
if err := os.MkdirAll(p, 0750); err != nil {
glog.Errorf("Error on creating %q: %v", p, err)
} else {
opts.PodContainerDir = p
}
}
opts.DNS, opts.DNSSearch, useClusterFirstPolicy, err = kl.GetClusterDNS(pod)
if err != nil {
return nil, false, err
}
// only do this check if the experimental behavior is enabled, otherwise allow it to default to false
if kl.experimentalHostUserNamespaceDefaulting {
opts.EnableHostUserNamespace = kl.enableHostUserNamespace(pod)
}
return opts, useClusterFirstPolicy, nil
}
var masterServices = sets.NewString("kubernetes")
// getServiceEnvVarMap makes a map[string]string of env vars for services a
// pod in namespace ns should see.
func (kl *Kubelet) getServiceEnvVarMap(ns string) (map[string]string, error) {
var (
serviceMap = make(map[string]*v1.Service)
m = make(map[string]string)
)
// Get all service resources from the master (via a cache),
// and populate them into service environment variables.
if kl.serviceLister == nil {
// Kubelets without masters (e.g. plain GCE ContainerVM) don't set env vars.
return m, nil
}
services, err := kl.serviceLister.List(labels.Everything())
if err != nil {
return m, fmt.Errorf("failed to list services when setting up env vars.")
}
// project the services in namespace ns onto the master services
for i := range services {
service := services[i]
// ignore services where ClusterIP is "None" or empty
if !v1helper.IsServiceIPSet(service) {
continue
}
serviceName := service.Name
switch service.Namespace {
// for the case whether the master service namespace is the namespace the pod
// is in, the pod should receive all the services in the namespace.
//
// ordering of the case clauses below enforces this
case ns:
serviceMap[serviceName] = service
case kl.masterServiceNamespace:
if masterServices.Has(serviceName) {
if _, exists := serviceMap[serviceName]; !exists {
serviceMap[serviceName] = service
}
}
}
}
mappedServices := []*v1.Service{}
for key := range serviceMap {
mappedServices = append(mappedServices, serviceMap[key])
}
for _, e := range envvars.FromServices(mappedServices) {
m[e.Name] = e.Value
}
return m, nil
}
// Make the environment variables for a pod in the given namespace.
func (kl *Kubelet) makeEnvironmentVariables(pod *v1.Pod, container *v1.Container, podIP string) ([]kubecontainer.EnvVar, error) {
var result []kubecontainer.EnvVar
// Note: These are added to the docker Config, but are not included in the checksum computed
// by kubecontainer.HashContainer(...). That way, we can still determine whether an
// v1.Container is already running by its hash. (We don't want to restart a container just
// because some service changed.)
//
// Note that there is a race between Kubelet seeing the pod and kubelet seeing the service.
// To avoid this users can: (1) wait between starting a service and starting; or (2) detect
// missing service env var and exit and be restarted; or (3) use DNS instead of env vars
// and keep trying to resolve the DNS name of the service (recommended).
serviceEnv, err := kl.getServiceEnvVarMap(pod.Namespace)
if err != nil {
return result, err
}
var (
configMaps = make(map[string]*v1.ConfigMap)
secrets = make(map[string]*v1.Secret)
tmpEnv = make(map[string]string)
)
// Env will override EnvFrom variables.
// Process EnvFrom first then allow Env to replace existing values.
for _, envFrom := range container.EnvFrom {
switch {
case envFrom.ConfigMapRef != nil:
cm := envFrom.ConfigMapRef
name := cm.Name
configMap, ok := configMaps[name]
if !ok {
if kl.kubeClient == nil {
return result, fmt.Errorf("Couldn't get configMap %v/%v, no kubeClient defined", pod.Namespace, name)
}
optional := cm.Optional != nil && *cm.Optional
configMap, err = kl.configMapManager.GetConfigMap(pod.Namespace, name)
if err != nil {
if errors.IsNotFound(err) && optional {
// ignore error when marked optional
continue
}
return result, err
}
configMaps[name] = configMap
}
invalidKeys := []string{}
for k, v := range configMap.Data {
if len(envFrom.Prefix) > 0 {
k = envFrom.Prefix + k
}
if errMsgs := utilvalidation.IsCIdentifier(k); len(errMsgs) != 0 {
invalidKeys = append(invalidKeys, k)
continue
}
tmpEnv[k] = v
}
if len(invalidKeys) > 0 {
sort.Strings(invalidKeys)
kl.recorder.Eventf(pod, v1.EventTypeWarning, "InvalidEnvironmentVariableNames", "Keys [%s] from the EnvFrom configMap %s/%s were skipped since they are considered invalid environment variable names.", strings.Join(invalidKeys, ", "), pod.Namespace, name)
}
case envFrom.SecretRef != nil:
s := envFrom.SecretRef
name := s.Name
secret, ok := secrets[name]
if !ok {
if kl.kubeClient == nil {
return result, fmt.Errorf("Couldn't get secret %v/%v, no kubeClient defined", pod.Namespace, name)
}
optional := s.Optional != nil && *s.Optional
secret, err = kl.secretManager.GetSecret(pod.Namespace, name)
if err != nil {
if errors.IsNotFound(err) && optional {
// ignore error when marked optional
continue
}
return result, err
}
secrets[name] = secret
}
invalidKeys := []string{}
for k, v := range secret.Data {
if len(envFrom.Prefix) > 0 {
k = envFrom.Prefix + k
}
if errMsgs := utilvalidation.IsCIdentifier(k); len(errMsgs) != 0 {
invalidKeys = append(invalidKeys, k)
continue
}
tmpEnv[k] = string(v)
}
if len(invalidKeys) > 0 {
sort.Strings(invalidKeys)
kl.recorder.Eventf(pod, v1.EventTypeWarning, "InvalidEnvironmentVariableNames", "Keys [%s] from the EnvFrom secret %s/%s were skipped since they are considered invalid environment variable names.", strings.Join(invalidKeys, ", "), pod.Namespace, name)
}
}
}
// Determine the final values of variables:
//
// 1. Determine the final value of each variable:
// a. If the variable's Value is set, expand the `$(var)` references to other
// variables in the .Value field; the sources of variables are the declared
// variables of the container and the service environment variables
// b. If a source is defined for an environment variable, resolve the source
// 2. Create the container's environment in the order variables are declared
// 3. Add remaining service environment vars
var (
mappingFunc = expansion.MappingFuncFor(tmpEnv, serviceEnv)
)
for _, envVar := range container.Env {
runtimeVal := envVar.Value
if runtimeVal != "" {
// Step 1a: expand variable references
runtimeVal = expansion.Expand(runtimeVal, mappingFunc)
} else if envVar.ValueFrom != nil {
// Step 1b: resolve alternate env var sources
switch {
case envVar.ValueFrom.FieldRef != nil:
runtimeVal, err = kl.podFieldSelectorRuntimeValue(envVar.ValueFrom.FieldRef, pod, podIP)
if err != nil {
return result, err
}
case envVar.ValueFrom.ResourceFieldRef != nil:
defaultedPod, defaultedContainer, err := kl.defaultPodLimitsForDownwardApi(pod, container)
if err != nil {
return result, err
}
runtimeVal, err = containerResourceRuntimeValue(envVar.ValueFrom.ResourceFieldRef, defaultedPod, defaultedContainer)
if err != nil {
return result, err
}
case envVar.ValueFrom.ConfigMapKeyRef != nil:
cm := envVar.ValueFrom.ConfigMapKeyRef
name := cm.Name
key := cm.Key
optional := cm.Optional != nil && *cm.Optional
configMap, ok := configMaps[name]
if !ok {
if kl.kubeClient == nil {
return result, fmt.Errorf("Couldn't get configMap %v/%v, no kubeClient defined", pod.Namespace, name)
}
configMap, err = kl.configMapManager.GetConfigMap(pod.Namespace, name)
if err != nil {
if errors.IsNotFound(err) && optional {
// ignore error when marked optional
continue
}
return result, err
}
configMaps[name] = configMap
}
runtimeVal, ok = configMap.Data[key]
if !ok {
if optional {
continue
}
return result, fmt.Errorf("Couldn't find key %v in ConfigMap %v/%v", key, pod.Namespace, name)
}
case envVar.ValueFrom.SecretKeyRef != nil:
s := envVar.ValueFrom.SecretKeyRef
name := s.Name
key := s.Key
optional := s.Optional != nil && *s.Optional
secret, ok := secrets[name]
if !ok {
if kl.kubeClient == nil {
return result, fmt.Errorf("Couldn't get secret %v/%v, no kubeClient defined", pod.Namespace, name)
}
secret, err = kl.secretManager.GetSecret(pod.Namespace, name)
if err != nil {
if errors.IsNotFound(err) && optional {
// ignore error when marked optional
continue
}
return result, err
}
secrets[name] = secret
}
runtimeValBytes, ok := secret.Data[key]
if !ok {
if optional {
continue
}
return result, fmt.Errorf("Couldn't find key %v in Secret %v/%v", key, pod.Namespace, name)
}
runtimeVal = string(runtimeValBytes)
}
}
// Accesses apiserver+Pods.
// So, the master may set service env vars, or kubelet may. In case both are doing
// it, we delete the key from the kubelet-generated ones so we don't have duplicate
// env vars.
// TODO: remove this next line once all platforms use apiserver+Pods.
delete(serviceEnv, envVar.Name)
tmpEnv[envVar.Name] = runtimeVal
}
// Append the env vars
for k, v := range tmpEnv {
result = append(result, kubecontainer.EnvVar{Name: k, Value: v})
}
// Append remaining service env vars.
for k, v := range serviceEnv {
// Accesses apiserver+Pods.
// So, the master may set service env vars, or kubelet may. In case both are doing
// it, we skip the key from the kubelet-generated ones so we don't have duplicate
// env vars.
// TODO: remove this next line once all platforms use apiserver+Pods.
if _, present := tmpEnv[k]; !present {
result = append(result, kubecontainer.EnvVar{Name: k, Value: v})
}
}
return result, nil
}
// podFieldSelectorRuntimeValue returns the runtime value of the given
// selector for a pod.
func (kl *Kubelet) podFieldSelectorRuntimeValue(fs *v1.ObjectFieldSelector, pod *v1.Pod, podIP string) (string, error) {
internalFieldPath, _, err := api.Scheme.ConvertFieldLabel(fs.APIVersion, "Pod", fs.FieldPath, "")
if err != nil {
return "", err
}
switch internalFieldPath {
case "spec.nodeName":
return pod.Spec.NodeName, nil
case "spec.serviceAccountName":
return pod.Spec.ServiceAccountName, nil
case "status.hostIP":
hostIP, err := kl.getHostIPAnyWay()
if err != nil {
return "", err
}
return hostIP.String(), nil
case "status.podIP":
return podIP, nil
}
return fieldpath.ExtractFieldPathAsString(pod, internalFieldPath)
}
// containerResourceRuntimeValue returns the value of the provided container resource
func containerResourceRuntimeValue(fs *v1.ResourceFieldSelector, pod *v1.Pod, container *v1.Container) (string, error) {
containerName := fs.ContainerName
if len(containerName) == 0 {
return resource.ExtractContainerResourceValue(fs, container)
} else {
return resource.ExtractResourceValueByContainerName(fs, pod, containerName)
}
}
// One of the following arguments must be non-nil: runningPod, status.
// TODO: Modify containerRuntime.KillPod() to accept the right arguments.
func (kl *Kubelet) killPod(pod *v1.Pod, runningPod *kubecontainer.Pod, status *kubecontainer.PodStatus, gracePeriodOverride *int64) error {
var p kubecontainer.Pod
if runningPod != nil {
p = *runningPod
} else if status != nil {
p = kubecontainer.ConvertPodStatusToRunningPod(kl.GetRuntime().Type(), status)
} else {
return fmt.Errorf("one of the two arguments must be non-nil: runningPod, status")
}
// Call the container runtime KillPod method which stops all running containers of the pod
if err := kl.containerRuntime.KillPod(pod, p, gracePeriodOverride); err != nil {
return err
}
if err := kl.containerManager.UpdateQOSCgroups(); err != nil {
glog.V(2).Infof("Failed to update QoS cgroups while killing pod: %v", err)
}
return nil
}
// makePodDataDirs creates the dirs for the pod datas.
func (kl *Kubelet) makePodDataDirs(pod *v1.Pod) error {
uid := pod.UID
if err := os.MkdirAll(kl.getPodDir(uid), 0750); err != nil && !os.IsExist(err) {
return err
}
if err := os.MkdirAll(kl.getPodVolumesDir(uid), 0750); err != nil && !os.IsExist(err) {
return err
}
if err := os.MkdirAll(kl.getPodPluginsDir(uid), 0750); err != nil && !os.IsExist(err) {
return err
}
return nil
}
// getPullSecretsForPod inspects the Pod and retrieves the referenced pull
// secrets.
func (kl *Kubelet) getPullSecretsForPod(pod *v1.Pod) []v1.Secret {
pullSecrets := []v1.Secret{}
for _, secretRef := range pod.Spec.ImagePullSecrets {
secret, err := kl.secretManager.GetSecret(pod.Namespace, secretRef.Name)
if err != nil {
glog.Warningf("Unable to retrieve pull secret %s/%s for %s/%s due to %v. The image pull may not succeed.", pod.Namespace, secretRef.Name, pod.Namespace, pod.Name, err)
continue
}
pullSecrets = append(pullSecrets, *secret)
}
return pullSecrets
}
// Returns true if pod is in the terminated state ("Failed" or "Succeeded").
func (kl *Kubelet) podIsTerminated(pod *v1.Pod) bool {
var status v1.PodStatus
// Check the cached pod status which was set after the last sync.
status, ok := kl.statusManager.GetPodStatus(pod.UID)
if !ok {
// If there is no cached status, use the status from the
// apiserver. This is useful if kubelet has recently been
// restarted.
status = pod.Status
}
return status.Phase == v1.PodFailed || status.Phase == v1.PodSucceeded || (pod.DeletionTimestamp != nil && notRunning(status.ContainerStatuses))
}
// PodResourcesAreReclaimed returns true if all required node-level resources that a pod was consuming have
// been reclaimed by the kubelet. Reclaiming resources is a prerequisite to deleting a pod from the API server.
func (kl *Kubelet) PodResourcesAreReclaimed(pod *v1.Pod, status v1.PodStatus) bool {
if !notRunning(status.ContainerStatuses) {
// We shouldnt delete pods that still have running containers
glog.V(3).Infof("Pod %q is terminated, but some containers are still running", format.Pod(pod))
return false
}
if kl.podVolumesExist(pod.UID) && !kl.kubeletConfiguration.KeepTerminatedPodVolumes {
// We shouldnt delete pods whose volumes have not been cleaned up if we are not keeping terminated pod volumes
glog.V(3).Infof("Pod %q is terminated, but some volumes have not been cleaned up", format.Pod(pod))
return false
}
if kl.kubeletConfiguration.CgroupsPerQOS {
pcm := kl.containerManager.NewPodContainerManager()
if pcm.Exists(pod) {
glog.V(3).Infof("Pod %q is terminated, but pod cgroup sandbox has not been cleaned up", format.Pod(pod))
return false
}
}
return true
}
// podResourcesAreReclaimed simply calls PodResourcesAreReclaimed with the most up-to-date status.
func (kl *Kubelet) podResourcesAreReclaimed(pod *v1.Pod) bool {
status, ok := kl.statusManager.GetPodStatus(pod.UID)
if !ok {
status = pod.Status
}
return kl.PodResourcesAreReclaimed(pod, status)
}
// notRunning returns true if every status is terminated or waiting, or the status list
// is empty.
func notRunning(statuses []v1.ContainerStatus) bool {
for _, status := range statuses {
if status.State.Terminated == nil && status.State.Waiting == nil {
return false
}
}
return true
}
// filterOutTerminatedPods returns the given pods which the status manager
// does not consider failed or succeeded.
func (kl *Kubelet) filterOutTerminatedPods(pods []*v1.Pod) []*v1.Pod {
var filteredPods []*v1.Pod
for _, p := range pods {
if kl.podIsTerminated(p) {
continue
}
filteredPods = append(filteredPods, p)
}
return filteredPods
}
// removeOrphanedPodStatuses removes obsolete entries in podStatus where
// the pod is no longer considered bound to this node.
func (kl *Kubelet) removeOrphanedPodStatuses(pods []*v1.Pod, mirrorPods []*v1.Pod) {
podUIDs := make(map[types.UID]bool)
for _, pod := range pods {
podUIDs[pod.UID] = true
}
for _, pod := range mirrorPods {
podUIDs[pod.UID] = true
}
kl.statusManager.RemoveOrphanedStatuses(podUIDs)
}
// HandlePodCleanups performs a series of cleanup work, including terminating
// pod workers, killing unwanted pods, and removing orphaned volumes/pod
// directories.
// NOTE: This function is executed by the main sync loop, so it
// should not contain any blocking calls.
func (kl *Kubelet) HandlePodCleanups() error {
// The kubelet lacks checkpointing, so we need to introspect the set of pods
// in the cgroup tree prior to inspecting the set of pods in our pod manager.
// this ensures our view of the cgroup tree does not mistakenly observe pods
// that are added after the fact...
var (
cgroupPods map[types.UID]cm.CgroupName
err error
)
if kl.cgroupsPerQOS {
pcm := kl.containerManager.NewPodContainerManager()
cgroupPods, err = pcm.GetAllPodsFromCgroups()
if err != nil {
return fmt.Errorf("failed to get list of pods that still exist on cgroup mounts: %v", err)
}
}
allPods, mirrorPods := kl.podManager.GetPodsAndMirrorPods()
// Pod phase progresses monotonically. Once a pod has reached a final state,
// it should never leave regardless of the restart policy. The statuses
// of such pods should not be changed, and there is no need to sync them.
// TODO: the logic here does not handle two cases:
// 1. If the containers were removed immediately after they died, kubelet
// may fail to generate correct statuses, let alone filtering correctly.
// 2. If kubelet restarted before writing the terminated status for a pod
// to the apiserver, it could still restart the terminated pod (even
// though the pod was not considered terminated by the apiserver).
// These two conditions could be alleviated by checkpointing kubelet.
activePods := kl.filterOutTerminatedPods(allPods)
desiredPods := make(map[types.UID]empty)
for _, pod := range activePods {
desiredPods[pod.UID] = empty{}
}
// Stop the workers for no-longer existing pods.
// TODO: is here the best place to forget pod workers?
kl.podWorkers.ForgetNonExistingPodWorkers(desiredPods)
kl.probeManager.CleanupPods(activePods)
runningPods, err := kl.runtimeCache.GetPods()
if err != nil {
glog.Errorf("Error listing containers: %#v", err)
return err
}
for _, pod := range runningPods {
if _, found := desiredPods[pod.ID]; !found {
kl.podKillingCh <- &kubecontainer.PodPair{APIPod: nil, RunningPod: pod}
}
}
kl.removeOrphanedPodStatuses(allPods, mirrorPods)
// Note that we just killed the unwanted pods. This may not have reflected
// in the cache. We need to bypass the cache to get the latest set of
// running pods to clean up the volumes.
// TODO: Evaluate the performance impact of bypassing the runtime cache.
runningPods, err = kl.containerRuntime.GetPods(false)
if err != nil {
glog.Errorf("Error listing containers: %#v", err)
return err
}
// Remove any orphaned volumes.
// Note that we pass all pods (including terminated pods) to the function,
// so that we don't remove volumes associated with terminated but not yet
// deleted pods.
err = kl.cleanupOrphanedPodDirs(allPods, runningPods)
if err != nil {
// We want all cleanup tasks to be run even if one of them failed. So
// we just log an error here and continue other cleanup tasks.
// This also applies to the other clean up tasks.
glog.Errorf("Failed cleaning up orphaned pod directories: %v", err)
}
// Remove any orphaned mirror pods.
kl.podManager.DeleteOrphanedMirrorPods()
// Clear out any old bandwidth rules
err = kl.cleanupBandwidthLimits(allPods)
if err != nil {
glog.Errorf("Failed cleaning up bandwidth limits: %v", err)
}
// Remove any cgroups in the hierarchy for pods that are no longer running.
if kl.cgroupsPerQOS {
kl.cleanupOrphanedPodCgroups(cgroupPods, activePods)
}
kl.backOff.GC()
return nil
}
// podKiller launches a goroutine to kill a pod received from the channel if
// another goroutine isn't already in action.
func (kl *Kubelet) podKiller() {
killing := sets.NewString()
// guard for the killing set
lock := sync.Mutex{}
for {
select {
case podPair, ok := <-kl.podKillingCh:
if !ok {
return
}
runningPod := podPair.RunningPod
apiPod := podPair.APIPod
lock.Lock()
exists := killing.Has(string(runningPod.ID))
if !exists {
killing.Insert(string(runningPod.ID))
}
lock.Unlock()
if !exists {
go func(apiPod *v1.Pod, runningPod *kubecontainer.Pod) {
glog.V(2).Infof("Killing unwanted pod %q", runningPod.Name)
err := kl.killPod(apiPod, runningPod, nil, nil)
if err != nil {
glog.Errorf("Failed killing the pod %q: %v", runningPod.Name, err)
}
lock.Lock()
killing.Delete(string(runningPod.ID))
lock.Unlock()
}(apiPod, runningPod)
}
}
}
}
// checkHostPortConflicts detects pods with conflicted host ports.
func hasHostPortConflicts(pods []*v1.Pod) bool {
ports := sets.String{}
for _, pod := range pods {
if errs := validation.AccumulateUniqueHostPorts(pod.Spec.Containers, &ports, field.NewPath("spec", "containers")); len(errs) > 0 {
glog.Errorf("Pod %q: HostPort is already allocated, ignoring: %v", format.Pod(pod), errs)
return true
}
if errs := validation.AccumulateUniqueHostPorts(pod.Spec.InitContainers, &ports, field.NewPath("spec", "initContainers")); len(errs) > 0 {
glog.Errorf("Pod %q: HostPort is already allocated, ignoring: %v", format.Pod(pod), errs)
return true
}
}
return false
}
// validateContainerLogStatus returns the container ID for the desired container to retrieve logs for, based on the state
// of the container. The previous flag will only return the logs for the last terminated container, otherwise, the current
// running container is preferred over a previous termination. If info about the container is not available then a specific
// error is returned to the end user.
func (kl *Kubelet) validateContainerLogStatus(podName string, podStatus *v1.PodStatus, containerName string, previous bool) (containerID kubecontainer.ContainerID, err error) {
var cID string
cStatus, found := podutil.GetContainerStatus(podStatus.ContainerStatuses, containerName)
// if not found, check the init containers
if !found {
cStatus, found = podutil.GetContainerStatus(podStatus.InitContainerStatuses, containerName)
}
if !found {
return kubecontainer.ContainerID{}, fmt.Errorf("container %q in pod %q is not available", containerName, podName)
}
lastState := cStatus.LastTerminationState
waiting, running, terminated := cStatus.State.Waiting, cStatus.State.Running, cStatus.State.Terminated
switch {
case previous:
if lastState.Terminated == nil {
return kubecontainer.ContainerID{}, fmt.Errorf("previous terminated container %q in pod %q not found", containerName, podName)
}
cID = lastState.Terminated.ContainerID
case running != nil:
cID = cStatus.ContainerID
case terminated != nil:
cID = terminated.ContainerID
case lastState.Terminated != nil:
cID = lastState.Terminated.ContainerID
case waiting != nil: