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metrics_grabber.go
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/
metrics_grabber.go
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/*
Copyright 2015 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 metrics
import (
"fmt"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
clientset "k8s.io/client-go/kubernetes"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/master/ports"
"k8s.io/kubernetes/pkg/util/system"
"github.com/golang/glog"
)
const (
ProxyTimeout = 2 * time.Minute
)
type MetricsCollection struct {
ApiServerMetrics ApiServerMetrics
ControllerManagerMetrics ControllerManagerMetrics
KubeletMetrics map[string]KubeletMetrics
SchedulerMetrics SchedulerMetrics
ClusterAutoscalerMetrics ClusterAutoscalerMetrics
}
type MetricsGrabber struct {
client clientset.Interface
externalClient clientset.Interface
grabFromApiServer bool
grabFromControllerManager bool
grabFromKubelets bool
grabFromScheduler bool
grabFromClusterAutoscaler bool
masterName string
registeredMaster bool
}
func NewMetricsGrabber(c clientset.Interface, ec clientset.Interface, kubelets bool, scheduler bool, controllers bool, apiServer bool, clusterAutoscaler bool) (*MetricsGrabber, error) {
registeredMaster := false
masterName := ""
nodeList, err := c.CoreV1().Nodes().List(metav1.ListOptions{})
if err != nil {
return nil, err
}
if len(nodeList.Items) < 1 {
glog.Warning("Can't find any Nodes in the API server to grab metrics from")
}
for _, node := range nodeList.Items {
if system.IsMasterNode(node.Name) {
registeredMaster = true
masterName = node.Name
break
}
}
if !registeredMaster {
scheduler = false
controllers = false
clusterAutoscaler = ec != nil
if clusterAutoscaler {
glog.Warningf("Master node is not registered. Grabbing metrics from Scheduler, ControllerManager is disabled.")
} else {
glog.Warningf("Master node is not registered. Grabbing metrics from Scheduler, ControllerManager and ClusterAutoscaler is disabled.")
}
}
return &MetricsGrabber{
client: c,
externalClient: ec,
grabFromApiServer: apiServer,
grabFromControllerManager: controllers,
grabFromKubelets: kubelets,
grabFromScheduler: scheduler,
grabFromClusterAutoscaler: clusterAutoscaler,
masterName: masterName,
registeredMaster: registeredMaster,
}, nil
}
// HasRegisteredMaster returns if metrics grabber was able to find a master node
func (g *MetricsGrabber) HasRegisteredMaster() bool {
return g.registeredMaster
}
func (g *MetricsGrabber) GrabFromKubelet(nodeName string) (KubeletMetrics, error) {
nodes, err := g.client.CoreV1().Nodes().List(metav1.ListOptions{FieldSelector: fields.Set{api.ObjectNameField: nodeName}.AsSelector().String()})
if err != nil {
return KubeletMetrics{}, err
}
if len(nodes.Items) != 1 {
return KubeletMetrics{}, fmt.Errorf("Error listing nodes with name %v, got %v", nodeName, nodes.Items)
}
kubeletPort := nodes.Items[0].Status.DaemonEndpoints.KubeletEndpoint.Port
return g.grabFromKubeletInternal(nodeName, int(kubeletPort))
}
func (g *MetricsGrabber) grabFromKubeletInternal(nodeName string, kubeletPort int) (KubeletMetrics, error) {
if kubeletPort <= 0 || kubeletPort > 65535 {
return KubeletMetrics{}, fmt.Errorf("Invalid Kubelet port %v. Skipping Kubelet's metrics gathering.", kubeletPort)
}
output, err := g.getMetricsFromNode(nodeName, int(kubeletPort))
if err != nil {
return KubeletMetrics{}, err
}
return parseKubeletMetrics(output)
}
func (g *MetricsGrabber) GrabFromScheduler() (SchedulerMetrics, error) {
if !g.registeredMaster {
return SchedulerMetrics{}, fmt.Errorf("Master's Kubelet is not registered. Skipping Scheduler's metrics gathering.")
}
output, err := g.getMetricsFromPod(g.client, fmt.Sprintf("%v-%v", "kube-scheduler", g.masterName), metav1.NamespaceSystem, ports.SchedulerPort)
if err != nil {
return SchedulerMetrics{}, err
}
return parseSchedulerMetrics(output)
}
func (g *MetricsGrabber) GrabFromClusterAutoscaler() (ClusterAutoscalerMetrics, error) {
if !g.registeredMaster && g.externalClient == nil {
return ClusterAutoscalerMetrics{}, fmt.Errorf("Master's Kubelet is not registered. Skipping ClusterAutoscaler's metrics gathering.")
}
var client clientset.Interface
var namespace string
if g.externalClient != nil {
client = g.externalClient
namespace = "kubemark"
} else {
client = g.client
namespace = metav1.NamespaceSystem
}
output, err := g.getMetricsFromPod(client, "cluster-autoscaler", namespace, 8085)
if err != nil {
return ClusterAutoscalerMetrics{}, err
}
return parseClusterAutoscalerMetrics(output)
}
func (g *MetricsGrabber) GrabFromControllerManager() (ControllerManagerMetrics, error) {
if !g.registeredMaster {
return ControllerManagerMetrics{}, fmt.Errorf("Master's Kubelet is not registered. Skipping ControllerManager's metrics gathering.")
}
output, err := g.getMetricsFromPod(g.client, fmt.Sprintf("%v-%v", "kube-controller-manager", g.masterName), metav1.NamespaceSystem, ports.InsecureKubeControllerManagerPort)
if err != nil {
return ControllerManagerMetrics{}, err
}
return parseControllerManagerMetrics(output)
}
func (g *MetricsGrabber) GrabFromApiServer() (ApiServerMetrics, error) {
output, err := g.getMetricsFromApiServer()
if err != nil {
return ApiServerMetrics{}, nil
}
return parseApiServerMetrics(output)
}
func (g *MetricsGrabber) Grab() (MetricsCollection, error) {
result := MetricsCollection{}
var errs []error
if g.grabFromApiServer {
metrics, err := g.GrabFromApiServer()
if err != nil {
errs = append(errs, err)
} else {
result.ApiServerMetrics = metrics
}
}
if g.grabFromScheduler {
metrics, err := g.GrabFromScheduler()
if err != nil {
errs = append(errs, err)
} else {
result.SchedulerMetrics = metrics
}
}
if g.grabFromControllerManager {
metrics, err := g.GrabFromControllerManager()
if err != nil {
errs = append(errs, err)
} else {
result.ControllerManagerMetrics = metrics
}
}
if g.grabFromClusterAutoscaler {
metrics, err := g.GrabFromClusterAutoscaler()
if err != nil {
errs = append(errs, err)
} else {
result.ClusterAutoscalerMetrics = metrics
}
}
if g.grabFromKubelets {
result.KubeletMetrics = make(map[string]KubeletMetrics)
nodes, err := g.client.CoreV1().Nodes().List(metav1.ListOptions{})
if err != nil {
errs = append(errs, err)
} else {
for _, node := range nodes.Items {
kubeletPort := node.Status.DaemonEndpoints.KubeletEndpoint.Port
metrics, err := g.grabFromKubeletInternal(node.Name, int(kubeletPort))
if err != nil {
errs = append(errs, err)
}
result.KubeletMetrics[node.Name] = metrics
}
}
}
if len(errs) > 0 {
return result, fmt.Errorf("Errors while grabbing metrics: %v", errs)
}
return result, nil
}
func (g *MetricsGrabber) getMetricsFromPod(client clientset.Interface, podName string, namespace string, port int) (string, error) {
rawOutput, err := client.CoreV1().RESTClient().Get().
Namespace(namespace).
Resource("pods").
SubResource("proxy").
Name(fmt.Sprintf("%v:%v", podName, port)).
Suffix("metrics").
Do().Raw()
if err != nil {
return "", err
}
return string(rawOutput), nil
}