/
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"
"strings"
"k8s.io/kubernetes/pkg/api"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/master/ports"
"k8s.io/kubernetes/pkg/util/sets"
"github.com/golang/glog"
)
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
kubeletPort int
masterName string
registeredMaster bool
}
// TODO: find a better way of figuring out if given node is a registered master.
func isMasterNode(node *api.Node) bool {
return strings.HasSuffix(node.Name, "master")
}
func NewMetricsGrabber(c *client.Client, kubelets bool, scheduler bool, controllers bool, apiServer bool) (*MetricsGrabber, error) {
kubeletPort := 0
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 isMasterNode(&node) {
registeredMaster = true
masterName = node.Name
} else {
// We assume that all Kubelets run on the same port, except possibly Master's Kubelet.
// This will need to get change if assumption is prover wrong.
kubeletPort = node.Status.DaemonEndpoints.KubeletEndpoint.Port
}
}
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,
kubeletPort: kubeletPort,
masterName: masterName,
registeredMaster: registeredMaster,
}, nil
}
func (g *MetricsGrabber) GrabFromKubelet(nodeName string, unknownMetrics sets.String) (KubeletMetrics, error) {
if g.kubeletPort == 0 {
return KubeletMetrics{}, fmt.Errorf("MetricsGrabber wasn't able to find Kubelet port during startup. Skipping Kubelet's metrics gathering.")
}
output, err := g.getMetricsFromNode(nodeName)
if err != nil {
return KubeletMetrics{}, err
}
return parseKubeletMetrics(output, unknownMetrics)
}
func (g *MetricsGrabber) GrabFromScheduler(unknownMetrics sets.String) (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, unknownMetrics)
}
func (g *MetricsGrabber) GrabFromControllerManager(unknownMetrics sets.String) (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, unknownMetrics)
}
func (g *MetricsGrabber) GrabFromApiServer(unknownMetrics sets.String) (ApiServerMetrics, error) {
output, err := g.getMetricsFromApiServer()
if err != nil {
return ApiServerMetrics{}, nil
}
return parseApiServerMetrics(output, unknownMetrics)
}
func (g *MetricsGrabber) Grab(unknownMetrics sets.String) (MetricsCollection, error) {
return MetricsCollection{}, nil
}