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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"
"sort"
"strings"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
utilpod "k8s.io/kubernetes/pkg/api/pod"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/api/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/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/labels"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/sets"
"k8s.io/kubernetes/pkg/util/term"
utilvalidation "k8s.io/kubernetes/pkg/util/validation"
"k8s.io/kubernetes/pkg/util/validation/field"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/util/volumehelper"
"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() []*api.Pod {
allPods := kl.podManager.GetPods()
activePods := kl.filterOutTerminatedPods(allPods)
return activePods
}
// makeDevices determines the devices for the given container.
// Experimental. For now, we hardcode /dev/nvidia0 no matter what the user asks for
// (we only support one device per node).
// TODO: add support for more than 1 GPU after #28216.
func makeDevices(container *api.Container) []kubecontainer.DeviceInfo {
nvidiaGPULimit := container.Resources.Limits.NvidiaGPU()
if nvidiaGPULimit.Value() != 0 {
return []kubecontainer.DeviceInfo{
{PathOnHost: "/dev/nvidia0", PathInContainer: "/dev/nvidia0", Permissions: "mrw"},
{PathOnHost: "/dev/nvidiactl", PathInContainer: "/dev/nvidiactl", Permissions: "mrw"},
{PathOnHost: "/dev/nvidia-uvm", PathInContainer: "/dev/nvidia-uvm", Permissions: "mrw"},
}
}
return nil
}
// makeMounts determines the mount points for the given container.
func makeMounts(pod *api.Pod, podDir string, container *api.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.
mountEtcHostsFile := (pod.Spec.SecurityContext == nil || !pod.Spec.SecurityContext.HostNetwork) && len(podIP) > 0
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 {
glog.Warningf("Mount cannot be satisfied for container %q, because the volume is missing: %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 != "" {
hostPath = filepath.Join(hostPath, mount.SubPath)
}
mounts = append(mounts, kubecontainer.Mount{
Name: mount.Name,
ContainerPath: mount.MountPath,
HostPath: hostPath,
ReadOnly: mount.ReadOnly,
SELinuxRelabel: relabelVolume,
})
}
if mountEtcHostsFile {
hostsMount, err := makeHostsMount(podDir, podIP, hostName, hostDomain)
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) (*kubecontainer.Mount, error) {
hostsFilePath := path.Join(podDir, "etc-hosts")
if err := ensureHostsFile(hostsFilePath, podIP, hostName, hostDomainName); 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) error {
if _, err := os.Stat(fileName); os.IsExist(err) {
glog.V(4).Infof("kubernetes-managed etc-hosts file exits. Will not be recreated: %q", fileName)
return nil
}
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))
}
return ioutil.WriteFile(fileName, buffer.Bytes(), 0644)
}
func makePortMappings(container *api.Container) (ports []kubecontainer.PortMapping) {
names := make(map[string]struct{})
for _, p := range container.Ports {
pm := kubecontainer.PortMapping{
HostPort: int(p.HostPort),
ContainerPort: int(p.ContainerPort),
Protocol: p.Protocol,
HostIP: p.HostIP,
}
// We need to create some default port name if it's not specified, since
// this is necessary for rkt.
// http://issue.k8s.io/7710
if p.Name == "" {
pm.Name = fmt.Sprintf("%s-%s:%d", container.Name, p.Protocol, p.ContainerPort)
} else {
pm.Name = fmt.Sprintf("%s-%s", container.Name, p.Name)
}
// Protect against exposing the same protocol-port more than once in a container.
if _, ok := names[pm.Name]; ok {
glog.Warningf("Port name conflicted, %q is defined more than once", pm.Name)
continue
}
ports = append(ports, pm)
names[pm.Name] = struct{}{}
}
return
}
// 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 *api.Pod) (string, string, error) {
// TODO(vmarmol): Handle better.
// Cap hostname at 63 chars (specification is 64bytes which is 63 chars and the null terminating char).
clusterDomain := kl.clusterDomain
const hostnameMaxLen = 63
podAnnotations := pod.Annotations
if podAnnotations == nil {
podAnnotations = make(map[string]string)
}
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
} else {
hostnameCandidate := podAnnotations[utilpod.PodHostnameAnnotation]
if len(utilvalidation.IsDNS1123Label(hostnameCandidate)) == 0 {
// use hostname annotation, if specified.
hostname = hostnameCandidate
}
}
if len(hostname) > hostnameMaxLen {
hostname = hostname[:hostnameMaxLen]
glog.Errorf("hostname for pod:%q was longer than %d. Truncated hostname to :%q", pod.Name, hostnameMaxLen, hostname)
}
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)
} else {
subdomainCandidate := pod.Annotations[utilpod.PodSubdomainAnnotation]
if len(utilvalidation.IsDNS1123Label(subdomainCandidate)) == 0 {
hostDomain = fmt.Sprintf("%s.%s.svc.%s", subdomainCandidate, pod.Namespace, clusterDomain)
}
}
return hostname, hostDomain, nil
}
// GenerateRunContainerOptions generates the RunContainerOptions, which can be used by
// the container runtime to set parameters for launching a container.
func (kl *Kubelet) GenerateRunContainerOptions(pod *api.Pod, container *api.Container, podIP string) (*kubecontainer.RunContainerOptions, error) {
var err error
pcm := kl.containerManager.NewPodContainerManager()
_, podContainerName := pcm.GetPodContainerName(pod)
opts := &kubecontainer.RunContainerOptions{CgroupParent: podContainerName}
hostname, hostDomainName, err := kl.GeneratePodHostNameAndDomain(pod)
if err != nil {
return nil, err
}
opts.Hostname = hostname
podName := volumehelper.GetUniquePodName(pod)
volumes := kl.volumeManager.GetMountedVolumesForPod(podName)
opts.PortMappings = makePortMappings(container)
opts.Devices = makeDevices(container)
opts.Mounts, err = makeMounts(pod, kl.getPodDir(pod.UID), container, hostname, hostDomainName, podIP, volumes)
if err != nil {
return nil, err
}
opts.Envs, err = kl.makeEnvironmentVariables(pod, container, podIP)
if err != nil {
return nil, err
}
if len(container.TerminationMessagePath) != 0 {
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, err = kl.GetClusterDNS(pod)
if err != nil {
return nil, err
}
return opts, 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]*api.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 !api.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 := []*api.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 *api.Pod, container *api.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 dockertools.BuildDockerName(...). That way, we can still determine whether an
// api.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
}
// 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 (
tmpEnv = make(map[string]string)
configMaps = make(map[string]*api.ConfigMap)
secrets = make(map[string]*api.Secret)
mappingFunc = expansion.MappingFuncFor(tmpEnv, serviceEnv)
)
for _, envVar := range container.Env {
// 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 net line once all platforms use apiserver+Pods.
delete(serviceEnv, envVar.Name)
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:
name := envVar.ValueFrom.ConfigMapKeyRef.Name
key := envVar.ValueFrom.ConfigMapKeyRef.Key
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.kubeClient.Core().ConfigMaps(pod.Namespace).Get(name)
if err != nil {
return result, err
}
configMaps[name] = configMap
}
runtimeVal, ok = configMap.Data[key]
if !ok {
return result, fmt.Errorf("Couldn't find key %v in ConfigMap %v/%v", key, pod.Namespace, name)
}
case envVar.ValueFrom.SecretKeyRef != nil:
name := envVar.ValueFrom.SecretKeyRef.Name
key := envVar.ValueFrom.SecretKeyRef.Key
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.kubeClient.Core().Secrets(pod.Namespace).Get(name)
if err != nil {
return result, err
}
secrets[name] = secret
}
runtimeValBytes, ok := secret.Data[key]
if !ok {
return result, fmt.Errorf("Couldn't find key %v in Secret %v/%v", key, pod.Namespace, name)
}
runtimeVal = string(runtimeValBytes)
}
}
tmpEnv[envVar.Name] = runtimeVal
result = append(result, kubecontainer.EnvVar{Name: envVar.Name, Value: tmpEnv[envVar.Name]})
}
// Append remaining service env vars.
for k, v := range serviceEnv {
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 *api.ObjectFieldSelector, pod *api.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.podIP":
return podIP, nil
}
return fieldpath.ExtractFieldPathAsString(pod, internalFieldPath)
}
// containerResourceRuntimeValue returns the value of the provided container resource
func containerResourceRuntimeValue(fs *api.ResourceFieldSelector, pod *api.Pod, container *api.Container) (string, error) {
containerName := fs.ContainerName
if len(containerName) == 0 {
return fieldpath.ExtractContainerResourceValue(fs, container)
} else {
return fieldpath.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 *api.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)
}
// cache the pod cgroup Name for reducing the cpu resource limits of the pod cgroup once the pod is killed
pcm := kl.containerManager.NewPodContainerManager()
var podCgroup cm.CgroupName
reduceCpuLimts := true
if pod != nil {
podCgroup, _ = pcm.GetPodContainerName(pod)
} else {
// If the pod is nil then cgroup limit must have already
// been decreased earlier
reduceCpuLimts = false
}
// 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
}
// At this point the pod might not completely free up cpu and memory resources.
// In such a case deleting the pod's cgroup might cause the pod's charges to be transferred
// to the parent cgroup. There might be various kinds of pod charges at this point.
// For example, any volume used by the pod that was backed by memory will have its
// pages charged to the pod cgroup until those volumes are removed by the kubelet.
// Hence we only reduce the cpu resource limits of the pod's cgroup
// and defer the responsibilty of destroying the pod's cgroup to the
// cleanup method and the housekeeping loop.
if reduceCpuLimts {
pcm.ReduceCPULimits(podCgroup)
}
return nil
}
// makePodDataDirs creates the dirs for the pod datas.
func (kl *Kubelet) makePodDataDirs(pod *api.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
}
// returns whether the pod uses the host network namespace.
func podUsesHostNetwork(pod *api.Pod) bool {
return pod.Spec.SecurityContext != nil && pod.Spec.SecurityContext.HostNetwork
}
// getPullSecretsForPod inspects the Pod and retrieves the referenced pull
// secrets.
// TODO: duplicate secrets are being retrieved multiple times and there
// is no cache. Creating and using a secret manager interface will make this
// easier to address.
func (kl *Kubelet) getPullSecretsForPod(pod *api.Pod) ([]api.Secret, error) {
pullSecrets := []api.Secret{}
for _, secretRef := range pod.Spec.ImagePullSecrets {
secret, err := kl.kubeClient.Core().Secrets(pod.Namespace).Get(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, nil
}
// Returns true if pod is in the terminated state ("Failed" or "Succeeded").
func (kl *Kubelet) podIsTerminated(pod *api.Pod) bool {
var status api.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
}
if status.Phase == api.PodFailed || status.Phase == api.PodSucceeded {
return true
}
return false
}
// filterOutTerminatedPods returns the given pods which the status manager
// does not consider failed or succeeded.
func (kl *Kubelet) filterOutTerminatedPods(pods []*api.Pod) []*api.Pod {
var filteredPods []*api.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 []*api.Pod, mirrorPods []*api.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 should no longer exist
if kl.cgroupsPerQOS {
kl.cleanupOrphanedPodCgroups(cgroupPods, allPods, runningPods)
}
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()
resultCh := make(chan types.UID)
defer close(resultCh)
for {
select {
case podPair, ok := <-kl.podKillingCh:
if !ok {
return
}
runningPod := podPair.RunningPod
apiPod := podPair.APIPod
if killing.Has(string(runningPod.ID)) {
// The pod is already being killed.
break
}
killing.Insert(string(runningPod.ID))
go func(apiPod *api.Pod, runningPod *kubecontainer.Pod, ch chan types.UID) {
defer func() {
ch <- runningPod.ID
}()
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)
}
}(apiPod, runningPod, resultCh)
case podID := <-resultCh:
killing.Delete(string(podID))
}
}
}
// checkHostPortConflicts detects pods with conflicted host ports.
func hasHostPortConflicts(pods []*api.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 *api.PodStatus, containerName string, previous bool) (containerID kubecontainer.ContainerID, err error) {
var cID string
cStatus, found := api.GetContainerStatus(podStatus.ContainerStatuses, containerName)
// if not found, check the init containers
if !found {
cStatus, found = api.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:
// output some info for the most common pending failures
switch reason := waiting.Reason; reason {
case images.ErrImagePull.Error():
return kubecontainer.ContainerID{}, fmt.Errorf("container %q in pod %q is waiting to start: image can't be pulled", containerName, podName)
case images.ErrImagePullBackOff.Error():
return kubecontainer.ContainerID{}, fmt.Errorf("container %q in pod %q is waiting to start: trying and failing to pull image", containerName, podName)
default:
return kubecontainer.ContainerID{}, fmt.Errorf("container %q in pod %q is waiting to start: %v", containerName, podName, reason)
}
default:
// unrecognized state
return kubecontainer.ContainerID{}, fmt.Errorf("container %q in pod %q is waiting to start - no logs yet", containerName, podName)
}
return kubecontainer.ParseContainerID(cID), nil
}
// GetKubeletContainerLogs returns logs from the container
// TODO: this method is returning logs of random container attempts, when it should be returning the most recent attempt
// or all of them.
func (kl *Kubelet) GetKubeletContainerLogs(podFullName, containerName string, logOptions *api.PodLogOptions, stdout, stderr io.Writer) error {
// Pod workers periodically write status to statusManager. If status is not
// cached there, something is wrong (or kubelet just restarted and hasn't
// caught up yet). Just assume the pod is not ready yet.
name, namespace, err := kubecontainer.ParsePodFullName(podFullName)
if err != nil {
return fmt.Errorf("unable to parse pod full name %q: %v", podFullName, err)
}
pod, ok := kl.GetPodByName(namespace, name)
if !ok {
return fmt.Errorf("pod %q cannot be found - no logs available", name)
}
podUID := pod.UID
if mirrorPod, ok := kl.podManager.GetMirrorPodByPod(pod); ok {
podUID = mirrorPod.UID
}
podStatus, found := kl.statusManager.GetPodStatus(podUID)
if !found {
// If there is no cached status, use the status from the
// apiserver. This is useful if kubelet has recently been
// restarted.
podStatus = pod.Status
}
// TODO: Consolidate the logic here with kuberuntime.GetContainerLogs, here we convert container name to containerID,
// but inside kuberuntime we convert container id back to container name and restart count.
// TODO: After separate container log lifecycle management, we should get log based on the existing log files
// instead of container status.
containerID, err := kl.validateContainerLogStatus(pod.Name, &podStatus, containerName, logOptions.Previous)
if err != nil {
return err
}
// Do a zero-byte write to stdout before handing off to the container runtime.
// This ensures at least one Write call is made to the writer when copying starts,
// even if we then block waiting for log output from the container.
if _, err := stdout.Write([]byte{}); err != nil {
return err
}
return kl.containerRuntime.GetContainerLogs(pod, containerID, logOptions, stdout, stderr)
}
// GetPhase returns the phase of a pod given its container info.
// This func is exported to simplify integration with 3rd party kubelet
// integrations like kubernetes-mesos.
func GetPhase(spec *api.PodSpec, info []api.ContainerStatus) api.PodPhase {
initialized := 0
pendingInitialization := 0
failedInitialization := 0
for _, container := range spec.InitContainers {
containerStatus, ok := api.GetContainerStatus(info, container.Name)
if !ok {
pendingInitialization++
continue
}
switch {
case containerStatus.State.Running != nil:
pendingInitialization++
case containerStatus.State.Terminated != nil:
if containerStatus.State.Terminated.ExitCode == 0 {
initialized++
} else {
failedInitialization++
}
case containerStatus.State.Waiting != nil:
if containerStatus.LastTerminationState.Terminated != nil {
if containerStatus.LastTerminationState.Terminated.ExitCode == 0 {
initialized++
} else {
failedInitialization++
}
} else {
pendingInitialization++
}
default:
pendingInitialization++
}
}
unknown := 0
running := 0
waiting := 0
stopped := 0
failed := 0
succeeded := 0
for _, container := range spec.Containers {
containerStatus, ok := api.GetContainerStatus(info, container.Name)
if !ok {
unknown++
continue
}
switch {
case containerStatus.State.Running != nil:
running++
case containerStatus.State.Terminated != nil:
stopped++
if containerStatus.State.Terminated.ExitCode == 0 {
succeeded++
} else {
failed++
}
case containerStatus.State.Waiting != nil:
if containerStatus.LastTerminationState.Terminated != nil {
stopped++
} else {
waiting++
}
default:
unknown++
}
}
if failedInitialization > 0 && spec.RestartPolicy == api.RestartPolicyNever {
return api.PodFailed
}
switch {
case pendingInitialization > 0:
fallthrough
case waiting > 0:
glog.V(5).Infof("pod waiting > 0, pending")
// One or more containers has not been started
return api.PodPending
case running > 0 && unknown == 0:
// All containers have been started, and at least
// one container is running
return api.PodRunning
case running == 0 && stopped > 0 && unknown == 0:
// All containers are terminated
if spec.RestartPolicy == api.RestartPolicyAlways {
// All containers are in the process of restarting
return api.PodRunning
}
if stopped == succeeded {
// RestartPolicy is not Always, and all
// containers are terminated in success
return api.PodSucceeded
}
if spec.RestartPolicy == api.RestartPolicyNever {
// RestartPolicy is Never, and all containers are
// terminated with at least one in failure
return api.PodFailed
}
// RestartPolicy is OnFailure, and at least one in failure
// and in the process of restarting
return api.PodRunning
default:
glog.V(5).Infof("pod default case, pending")
return api.PodPending
}
}
// generateAPIPodStatus creates the final API pod status for a pod, given the
// internal pod status.
func (kl *Kubelet) generateAPIPodStatus(pod *api.Pod, podStatus *kubecontainer.PodStatus) api.PodStatus {
glog.V(3).Infof("Generating status for %q", format.Pod(pod))
// check if an internal module has requested the pod is evicted.
for _, podSyncHandler := range kl.PodSyncHandlers {
if result := podSyncHandler.ShouldEvict(pod); result.Evict {
return api.PodStatus{
Phase: api.PodFailed,
Reason: result.Reason,
Message: result.Message,
}