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summary.go
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summary.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 stats
import (
"fmt"
"strings"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kubetypes "k8s.io/apimachinery/pkg/types"
"k8s.io/kubernetes/pkg/api/v1"
"k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/stats"
"k8s.io/kubernetes/pkg/kubelet/cm"
"k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/leaky"
"k8s.io/kubernetes/pkg/kubelet/network"
"k8s.io/kubernetes/pkg/kubelet/types"
"github.com/golang/glog"
cadvisorapiv1 "github.com/google/cadvisor/info/v1"
cadvisorapiv2 "github.com/google/cadvisor/info/v2"
)
type SummaryProvider interface {
// Get provides a new Summary using the latest results from cadvisor
Get() (*stats.Summary, error)
}
type summaryProviderImpl struct {
provider StatsProvider
fsResourceAnalyzer fsResourceAnalyzerInterface
runtime container.Runtime
}
var _ SummaryProvider = &summaryProviderImpl{}
// NewSummaryProvider returns a new SummaryProvider
func NewSummaryProvider(statsProvider StatsProvider, fsResourceAnalyzer fsResourceAnalyzerInterface, cruntime container.Runtime) SummaryProvider {
return &summaryProviderImpl{statsProvider, fsResourceAnalyzer, cruntime}
}
// Get implements the SummaryProvider interface
// Query cadvisor for the latest resource metrics and build into a summary
func (sp *summaryProviderImpl) Get() (*stats.Summary, error) {
options := cadvisorapiv2.RequestOptions{
IdType: cadvisorapiv2.TypeName,
Count: 2, // 2 samples are needed to compute "instantaneous" CPU
Recursive: true,
}
infos, err := sp.provider.GetContainerInfoV2("/", options)
if err != nil {
if _, ok := infos["/"]; ok {
// If the failure is partial, log it and return a best-effort response.
glog.Errorf("Partial failure issuing GetContainerInfoV2: %v", err)
} else {
return nil, fmt.Errorf("failed GetContainerInfoV2: %v", err)
}
}
// TODO(timstclair): Consider returning a best-effort response if any of the following errors
// occur.
node, err := sp.provider.GetNode()
if err != nil {
return nil, fmt.Errorf("failed GetNode: %v", err)
}
nodeConfig := sp.provider.GetNodeConfig()
rootFsInfo, err := sp.provider.RootFsInfo()
if err != nil {
return nil, fmt.Errorf("failed RootFsInfo: %v", err)
}
imageFsInfo, err := sp.provider.ImagesFsInfo()
if err != nil {
return nil, fmt.Errorf("failed DockerImagesFsInfo: %v", err)
}
imageStats, err := sp.runtime.ImageStats()
if err != nil || imageStats == nil {
return nil, fmt.Errorf("failed ImageStats: %v", err)
}
sb := &summaryBuilder{sp.fsResourceAnalyzer, node, nodeConfig, rootFsInfo, imageFsInfo, *imageStats, infos}
return sb.build()
}
// summaryBuilder aggregates the datastructures provided by cadvisor into a Summary result
type summaryBuilder struct {
fsResourceAnalyzer fsResourceAnalyzerInterface
node *v1.Node
nodeConfig cm.NodeConfig
rootFsInfo cadvisorapiv2.FsInfo
imageFsInfo cadvisorapiv2.FsInfo
imageStats container.ImageStats
infos map[string]cadvisorapiv2.ContainerInfo
}
// build returns a Summary from aggregating the input data
func (sb *summaryBuilder) build() (*stats.Summary, error) {
rootInfo, found := sb.infos["/"]
if !found {
return nil, fmt.Errorf("Missing stats for root container")
}
var nodeFsInodesUsed *uint64
if sb.rootFsInfo.Inodes != nil && sb.rootFsInfo.InodesFree != nil {
nodeFsIU := *sb.rootFsInfo.Inodes - *sb.rootFsInfo.InodesFree
nodeFsInodesUsed = &nodeFsIU
}
var imageFsInodesUsed *uint64
if sb.imageFsInfo.Inodes != nil && sb.imageFsInfo.InodesFree != nil {
imageFsIU := *sb.imageFsInfo.Inodes - *sb.imageFsInfo.InodesFree
imageFsInodesUsed = &imageFsIU
}
rootStats := sb.containerInfoV2ToStats("", &rootInfo)
nodeStats := stats.NodeStats{
NodeName: sb.node.Name,
CPU: rootStats.CPU,
Memory: rootStats.Memory,
Network: sb.containerInfoV2ToNetworkStats("node:"+sb.node.Name, &rootInfo),
Fs: &stats.FsStats{
AvailableBytes: &sb.rootFsInfo.Available,
CapacityBytes: &sb.rootFsInfo.Capacity,
UsedBytes: &sb.rootFsInfo.Usage,
InodesFree: sb.rootFsInfo.InodesFree,
Inodes: sb.rootFsInfo.Inodes,
InodesUsed: nodeFsInodesUsed,
},
StartTime: rootStats.StartTime,
Runtime: &stats.RuntimeStats{
ImageFs: &stats.FsStats{
AvailableBytes: &sb.imageFsInfo.Available,
CapacityBytes: &sb.imageFsInfo.Capacity,
UsedBytes: &sb.imageStats.TotalStorageBytes,
InodesFree: sb.imageFsInfo.InodesFree,
Inodes: sb.imageFsInfo.Inodes,
InodesUsed: imageFsInodesUsed,
},
},
}
systemContainers := map[string]string{
stats.SystemContainerKubelet: sb.nodeConfig.KubeletCgroupsName,
stats.SystemContainerRuntime: sb.nodeConfig.RuntimeCgroupsName,
stats.SystemContainerMisc: sb.nodeConfig.SystemCgroupsName,
}
for sys, name := range systemContainers {
if info, ok := sb.infos[name]; ok {
sysCont := sb.containerInfoV2ToStats(sys, &info)
// System containers don't have a filesystem associated with them.
sysCont.Rootfs = nil
sysCont.Logs = nil
nodeStats.SystemContainers = append(nodeStats.SystemContainers, sysCont)
}
}
summary := stats.Summary{
Node: nodeStats,
Pods: sb.buildSummaryPods(),
}
return &summary, nil
}
// containerInfoV2FsStats populates the container fs stats
func (sb *summaryBuilder) containerInfoV2FsStats(
info *cadvisorapiv2.ContainerInfo,
cs *stats.ContainerStats) {
// The container logs live on the node rootfs device
cs.Logs = &stats.FsStats{
AvailableBytes: &sb.rootFsInfo.Available,
CapacityBytes: &sb.rootFsInfo.Capacity,
InodesFree: sb.rootFsInfo.InodesFree,
Inodes: sb.rootFsInfo.Inodes,
}
if sb.rootFsInfo.Inodes != nil && sb.rootFsInfo.InodesFree != nil {
logsInodesUsed := *sb.rootFsInfo.Inodes - *sb.rootFsInfo.InodesFree
cs.Logs.InodesUsed = &logsInodesUsed
}
// The container rootFs lives on the imageFs devices (which may not be the node root fs)
cs.Rootfs = &stats.FsStats{
AvailableBytes: &sb.imageFsInfo.Available,
CapacityBytes: &sb.imageFsInfo.Capacity,
InodesFree: sb.imageFsInfo.InodesFree,
Inodes: sb.imageFsInfo.Inodes,
}
lcs, found := sb.latestContainerStats(info)
if !found {
return
}
cfs := lcs.Filesystem
if cfs != nil {
if cfs.BaseUsageBytes != nil {
rootfsUsage := *cfs.BaseUsageBytes
cs.Rootfs.UsedBytes = &rootfsUsage
if cfs.TotalUsageBytes != nil {
logsUsage := *cfs.TotalUsageBytes - *cfs.BaseUsageBytes
cs.Logs.UsedBytes = &logsUsage
}
}
if cfs.InodeUsage != nil {
rootInodes := *cfs.InodeUsage
cs.Rootfs.InodesUsed = &rootInodes
}
}
}
// latestContainerStats returns the latest container stats from cadvisor, or nil if none exist
func (sb *summaryBuilder) latestContainerStats(info *cadvisorapiv2.ContainerInfo) (*cadvisorapiv2.ContainerStats, bool) {
stats := info.Stats
if len(stats) < 1 {
return nil, false
}
latest := stats[len(stats)-1]
if latest == nil {
return nil, false
}
return latest, true
}
// buildSummaryPods aggregates and returns the container stats in cinfos by the Pod managing the container.
// Containers not managed by a Pod are omitted.
func (sb *summaryBuilder) buildSummaryPods() []stats.PodStats {
// Map each container to a pod and update the PodStats with container data
podToStats := map[stats.PodReference]*stats.PodStats{}
for key, cinfo := range sb.infos {
// on systemd using devicemapper each mount into the container has an associated cgroup.
// we ignore them to ensure we do not get duplicate entries in our summary.
// for details on .mount units: http://man7.org/linux/man-pages/man5/systemd.mount.5.html
if strings.HasSuffix(key, ".mount") {
continue
}
// Build the Pod key if this container is managed by a Pod
if !sb.isPodManagedContainer(&cinfo) {
continue
}
ref := sb.buildPodRef(&cinfo)
// Lookup the PodStats for the pod using the PodRef. If none exists, initialize a new entry.
podStats, found := podToStats[ref]
if !found {
podStats = &stats.PodStats{PodRef: ref}
podToStats[ref] = podStats
}
// Update the PodStats entry with the stats from the container by adding it to stats.Containers
containerName := types.GetContainerName(cinfo.Spec.Labels)
if containerName == leaky.PodInfraContainerName {
// Special case for infrastructure container which is hidden from the user and has network stats
podStats.Network = sb.containerInfoV2ToNetworkStats("pod:"+ref.Namespace+"_"+ref.Name, &cinfo)
podStats.StartTime = metav1.NewTime(cinfo.Spec.CreationTime)
} else {
podStats.Containers = append(podStats.Containers, sb.containerInfoV2ToStats(containerName, &cinfo))
}
}
// Add each PodStats to the result
result := make([]stats.PodStats, 0, len(podToStats))
for _, podStats := range podToStats {
// Lookup the volume stats for each pod
podUID := kubetypes.UID(podStats.PodRef.UID)
if vstats, found := sb.fsResourceAnalyzer.GetPodVolumeStats(podUID); found {
podStats.VolumeStats = vstats.Volumes
}
result = append(result, *podStats)
}
return result
}
// buildPodRef returns a PodReference that identifies the Pod managing cinfo
func (sb *summaryBuilder) buildPodRef(cinfo *cadvisorapiv2.ContainerInfo) stats.PodReference {
podName := types.GetPodName(cinfo.Spec.Labels)
podNamespace := types.GetPodNamespace(cinfo.Spec.Labels)
podUID := types.GetPodUID(cinfo.Spec.Labels)
return stats.PodReference{Name: podName, Namespace: podNamespace, UID: podUID}
}
// isPodManagedContainer returns true if the cinfo container is managed by a Pod
func (sb *summaryBuilder) isPodManagedContainer(cinfo *cadvisorapiv2.ContainerInfo) bool {
podName := types.GetPodName(cinfo.Spec.Labels)
podNamespace := types.GetPodNamespace(cinfo.Spec.Labels)
managed := podName != "" && podNamespace != ""
if !managed && podName != podNamespace {
glog.Warningf(
"Expect container to have either both podName (%s) and podNamespace (%s) labels, or neither.",
podName, podNamespace)
}
return managed
}
func (sb *summaryBuilder) containerInfoV2ToStats(
name string,
info *cadvisorapiv2.ContainerInfo) stats.ContainerStats {
cStats := stats.ContainerStats{
StartTime: metav1.NewTime(info.Spec.CreationTime),
Name: name,
}
cstat, found := sb.latestContainerStats(info)
if !found {
return cStats
}
if info.Spec.HasCpu {
cpuStats := stats.CPUStats{
Time: metav1.NewTime(cstat.Timestamp),
}
if cstat.CpuInst != nil {
cpuStats.UsageNanoCores = &cstat.CpuInst.Usage.Total
}
if cstat.Cpu != nil {
cpuStats.UsageCoreNanoSeconds = &cstat.Cpu.Usage.Total
}
cStats.CPU = &cpuStats
}
if info.Spec.HasMemory {
pageFaults := cstat.Memory.ContainerData.Pgfault
majorPageFaults := cstat.Memory.ContainerData.Pgmajfault
cStats.Memory = &stats.MemoryStats{
Time: metav1.NewTime(cstat.Timestamp),
UsageBytes: &cstat.Memory.Usage,
WorkingSetBytes: &cstat.Memory.WorkingSet,
RSSBytes: &cstat.Memory.RSS,
PageFaults: &pageFaults,
MajorPageFaults: &majorPageFaults,
}
// availableBytes = memory limit (if known) - workingset
if !isMemoryUnlimited(info.Spec.Memory.Limit) {
availableBytes := info.Spec.Memory.Limit - cstat.Memory.WorkingSet
cStats.Memory.AvailableBytes = &availableBytes
}
}
sb.containerInfoV2FsStats(info, &cStats)
cStats.UserDefinedMetrics = sb.containerInfoV2ToUserDefinedMetrics(info)
return cStats
}
// Size after which we consider memory to be "unlimited". This is not
// MaxInt64 due to rounding by the kernel.
// TODO: cadvisor should export this https://github.com/google/cadvisor/blob/master/metrics/prometheus.go#L596
const maxMemorySize = uint64(1 << 62)
func isMemoryUnlimited(v uint64) bool {
return v > maxMemorySize
}
func (sb *summaryBuilder) containerInfoV2ToNetworkStats(name string, info *cadvisorapiv2.ContainerInfo) *stats.NetworkStats {
if !info.Spec.HasNetwork {
return nil
}
cstat, found := sb.latestContainerStats(info)
if !found {
return nil
}
for _, inter := range cstat.Network.Interfaces {
if inter.Name == network.DefaultInterfaceName {
return &stats.NetworkStats{
Time: metav1.NewTime(cstat.Timestamp),
RxBytes: &inter.RxBytes,
RxErrors: &inter.RxErrors,
TxBytes: &inter.TxBytes,
TxErrors: &inter.TxErrors,
}
}
}
glog.V(4).Infof("Missing default interface %q for %s", network.DefaultInterfaceName, name)
return nil
}
func (sb *summaryBuilder) containerInfoV2ToUserDefinedMetrics(info *cadvisorapiv2.ContainerInfo) []stats.UserDefinedMetric {
type specVal struct {
ref stats.UserDefinedMetricDescriptor
valType cadvisorapiv1.DataType
time time.Time
value float64
}
udmMap := map[string]*specVal{}
for _, spec := range info.Spec.CustomMetrics {
udmMap[spec.Name] = &specVal{
ref: stats.UserDefinedMetricDescriptor{
Name: spec.Name,
Type: stats.UserDefinedMetricType(spec.Type),
Units: spec.Units,
},
valType: spec.Format,
}
}
for _, stat := range info.Stats {
for name, values := range stat.CustomMetrics {
specVal, ok := udmMap[name]
if !ok {
glog.Warningf("spec for custom metric %q is missing from cAdvisor output. Spec: %+v, Metrics: %+v", name, info.Spec, stat.CustomMetrics)
continue
}
for _, value := range values {
// Pick the most recent value
if value.Timestamp.Before(specVal.time) {
continue
}
specVal.time = value.Timestamp
specVal.value = value.FloatValue
if specVal.valType == cadvisorapiv1.IntType {
specVal.value = float64(value.IntValue)
}
}
}
}
var udm []stats.UserDefinedMetric
for _, specVal := range udmMap {
udm = append(udm, stats.UserDefinedMetric{
UserDefinedMetricDescriptor: specVal.ref,
Time: metav1.NewTime(specVal.time),
Value: specVal.value,
})
}
return udm
}