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metrics_grabber.go
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metrics_grabber.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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"
"k8s.io/kubernetes/pkg/api"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/fields"
"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
}
type MetricsGrabber struct {
client *client.Client
grabFromApiServer bool
grabFromControllerManager bool
grabFromKubelets bool
grabFromScheduler bool
masterName string
registeredMaster bool
}
func NewMetricsGrabber(c *client.Client, kubelets bool, scheduler bool, controllers bool, apiServer bool) (*MetricsGrabber, error) {
registeredMaster := false
masterName := ""
nodeList, err := c.Nodes().List(api.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) {
registeredMaster = true
masterName = node.Name
break
}
}
if !registeredMaster {
scheduler = false
controllers = false
glog.Warningf("Master node is not registered. Grabbing metrics from Scheduler and ControllerManager is disabled.")
}
return &MetricsGrabber{
client: c,
grabFromApiServer: apiServer,
grabFromControllerManager: controllers,
grabFromKubelets: kubelets,
grabFromScheduler: scheduler,
masterName: masterName,
registeredMaster: registeredMaster,
}, nil
}
func (g *MetricsGrabber) GrabFromKubelet(nodeName string) (KubeletMetrics, error) {
nodes, err := g.client.Nodes().List(api.ListOptions{FieldSelector: fields.Set{api.ObjectNameField: nodeName}.AsSelector()})
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(fmt.Sprintf("%v-%v", "kube-scheduler", g.masterName), api.NamespaceSystem, ports.SchedulerPort)
if err != nil {
return SchedulerMetrics{}, err
}
return parseSchedulerMetrics(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(fmt.Sprintf("%v-%v", "kube-controller-manager", g.masterName), api.NamespaceSystem, ports.ControllerManagerPort)
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.grabFromKubelets {
result.KubeletMetrics = make(map[string]KubeletMetrics)
nodes, err := g.client.Nodes().List(api.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 MetricsCollection{}, fmt.Errorf("Errors while grabbing metrics: %v", errs)
}
return result, nil
}