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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"
"github.com/golang/glog"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
statsapi "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
"k8s.io/kubernetes/pkg/kubelet/util"
)
type SummaryProvider interface {
// Get provides a new Summary with the stats from Kubelet,
// and will update some stats if updateStats is true
Get(updateStats bool) (*statsapi.Summary, error)
}
// summaryProviderImpl implements the SummaryProvider interface.
type summaryProviderImpl struct {
// kubeletCreationTime is the time at which the summaryProvider was created.
kubeletCreationTime metav1.Time
// systemBootTime is the time at which the system was started
systemBootTime metav1.Time
provider StatsProvider
}
var _ SummaryProvider = &summaryProviderImpl{}
// NewSummaryProvider returns a SummaryProvider using the stats provided by the
// specified statsProvider.
func NewSummaryProvider(statsProvider StatsProvider) SummaryProvider {
kubeletCreationTime := metav1.Now()
bootTime, err := util.GetBootTime()
if err != nil {
// bootTime will be zero if we encounter an error getting the boot time.
glog.Warningf("Error getting system boot time. Node metrics will have an incorrect start time: %v", err)
}
return &summaryProviderImpl{
kubeletCreationTime: kubeletCreationTime,
systemBootTime: metav1.NewTime(bootTime),
provider: statsProvider,
}
}
func (sp *summaryProviderImpl) Get(updateStats bool) (*statsapi.Summary, error) {
// 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 to get node info: %v", err)
}
nodeConfig := sp.provider.GetNodeConfig()
rootStats, networkStats, err := sp.provider.GetCgroupStats("/", updateStats)
if err != nil {
return nil, fmt.Errorf("failed to get root cgroup stats: %v", err)
}
rootFsStats, err := sp.provider.RootFsStats()
if err != nil {
return nil, fmt.Errorf("failed to get rootFs stats: %v", err)
}
imageFsStats, err := sp.provider.ImageFsStats()
if err != nil {
return nil, fmt.Errorf("failed to get imageFs stats: %v", err)
}
podStats, err := sp.provider.ListPodStats()
if err != nil {
return nil, fmt.Errorf("failed to list pod stats: %v", err)
}
rlimit, err := sp.provider.RlimitStats()
if err != nil {
return nil, fmt.Errorf("failed to get rlimit stats: %v", err)
}
nodeStats := statsapi.NodeStats{
NodeName: node.Name,
CPU: rootStats.CPU,
Memory: rootStats.Memory,
Network: networkStats,
StartTime: sp.systemBootTime,
Fs: rootFsStats,
Runtime: &statsapi.RuntimeStats{ImageFs: imageFsStats},
Rlimit: rlimit,
}
systemContainers := map[string]struct {
name string
forceStatsUpdate bool
startTime metav1.Time
}{
statsapi.SystemContainerKubelet: {name: nodeConfig.KubeletCgroupsName, forceStatsUpdate: false, startTime: sp.kubeletCreationTime},
statsapi.SystemContainerRuntime: {name: nodeConfig.RuntimeCgroupsName, forceStatsUpdate: false},
statsapi.SystemContainerMisc: {name: nodeConfig.SystemCgroupsName, forceStatsUpdate: false},
statsapi.SystemContainerPods: {name: sp.provider.GetPodCgroupRoot(), forceStatsUpdate: updateStats},
}
for sys, cont := range systemContainers {
// skip if cgroup name is undefined (not all system containers are required)
if cont.name == "" {
continue
}
s, _, err := sp.provider.GetCgroupStats(cont.name, cont.forceStatsUpdate)
if err != nil {
glog.Errorf("Failed to get system container stats for %q: %v", cont.name, err)
continue
}
// System containers don't have a filesystem associated with them.
s.Logs, s.Rootfs = nil, nil
s.Name = sys
// if we know the start time of a system container, use that instead of the start time provided by cAdvisor
if !cont.startTime.IsZero() {
s.StartTime = cont.startTime
}
nodeStats.SystemContainers = append(nodeStats.SystemContainers, *s)
}
summary := statsapi.Summary{
Node: nodeStats,
Pods: podStats,
}
return &summary, nil
}