kubernetes top_node 源码
kubernetes top_node 代码
文件路径:/staging/src/k8s.io/kubectl/pkg/cmd/top/top_node.go
/*
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 top
import (
"context"
"errors"
"github.com/spf13/cobra"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/client-go/discovery"
corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
cmdutil "k8s.io/kubectl/pkg/cmd/util"
"k8s.io/kubectl/pkg/metricsutil"
"k8s.io/kubectl/pkg/util/completion"
"k8s.io/kubectl/pkg/util/i18n"
"k8s.io/kubectl/pkg/util/templates"
metricsapi "k8s.io/metrics/pkg/apis/metrics"
metricsV1beta1api "k8s.io/metrics/pkg/apis/metrics/v1beta1"
metricsclientset "k8s.io/metrics/pkg/client/clientset/versioned"
)
// TopNodeOptions contains all the options for running the top-node cli command.
type TopNodeOptions struct {
ResourceName string
Selector string
SortBy string
NoHeaders bool
UseProtocolBuffers bool
ShowCapacity bool
NodeClient corev1client.CoreV1Interface
Printer *metricsutil.TopCmdPrinter
DiscoveryClient discovery.DiscoveryInterface
MetricsClient metricsclientset.Interface
genericclioptions.IOStreams
}
var (
topNodeLong = templates.LongDesc(i18n.T(`
Display resource (CPU/memory) usage of nodes.
The top-node command allows you to see the resource consumption of nodes.`))
topNodeExample = templates.Examples(i18n.T(`
# Show metrics for all nodes
kubectl top node
# Show metrics for a given node
kubectl top node NODE_NAME`))
)
func NewCmdTopNode(f cmdutil.Factory, o *TopNodeOptions, streams genericclioptions.IOStreams) *cobra.Command {
if o == nil {
o = &TopNodeOptions{
IOStreams: streams,
UseProtocolBuffers: true,
}
}
cmd := &cobra.Command{
Use: "node [NAME | -l label]",
DisableFlagsInUseLine: true,
Short: i18n.T("Display resource (CPU/memory) usage of nodes"),
Long: topNodeLong,
Example: topNodeExample,
ValidArgsFunction: completion.ResourceNameCompletionFunc(f, "node"),
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))
cmdutil.CheckErr(o.Validate())
cmdutil.CheckErr(o.RunTopNode())
},
Aliases: []string{"nodes", "no"},
}
cmdutil.AddLabelSelectorFlagVar(cmd, &o.Selector)
cmd.Flags().StringVar(&o.SortBy, "sort-by", o.SortBy, "If non-empty, sort nodes list using specified field. The field can be either 'cpu' or 'memory'.")
cmd.Flags().BoolVar(&o.NoHeaders, "no-headers", o.NoHeaders, "If present, print output without headers")
cmd.Flags().BoolVar(&o.UseProtocolBuffers, "use-protocol-buffers", o.UseProtocolBuffers, "Enables using protocol-buffers to access Metrics API.")
cmd.Flags().BoolVar(&o.ShowCapacity, "show-capacity", o.ShowCapacity, "Print node resources based on Capacity instead of Allocatable(default) of the nodes.")
return cmd
}
func (o *TopNodeOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
if len(args) == 1 {
o.ResourceName = args[0]
} else if len(args) > 1 {
return cmdutil.UsageErrorf(cmd, "%s", cmd.Use)
}
clientset, err := f.KubernetesClientSet()
if err != nil {
return err
}
o.DiscoveryClient = clientset.DiscoveryClient
config, err := f.ToRESTConfig()
if err != nil {
return err
}
if o.UseProtocolBuffers {
config.ContentType = "application/vnd.kubernetes.protobuf"
}
o.MetricsClient, err = metricsclientset.NewForConfig(config)
if err != nil {
return err
}
o.NodeClient = clientset.CoreV1()
o.Printer = metricsutil.NewTopCmdPrinter(o.Out)
return nil
}
func (o *TopNodeOptions) Validate() error {
if len(o.SortBy) > 0 {
if o.SortBy != sortByCPU && o.SortBy != sortByMemory {
return errors.New("--sort-by accepts only cpu or memory")
}
}
if len(o.ResourceName) > 0 && len(o.Selector) > 0 {
return errors.New("only one of NAME or --selector can be provided")
}
return nil
}
func (o TopNodeOptions) RunTopNode() error {
var err error
selector := labels.Everything()
if len(o.Selector) > 0 {
selector, err = labels.Parse(o.Selector)
if err != nil {
return err
}
}
apiGroups, err := o.DiscoveryClient.ServerGroups()
if err != nil {
return err
}
metricsAPIAvailable := SupportedMetricsAPIVersionAvailable(apiGroups)
if !metricsAPIAvailable {
return errors.New("Metrics API not available")
}
metrics, err := getNodeMetricsFromMetricsAPI(o.MetricsClient, o.ResourceName, selector)
if err != nil {
return err
}
if len(metrics.Items) == 0 {
return errors.New("metrics not available yet")
}
var nodes []v1.Node
if len(o.ResourceName) > 0 {
node, err := o.NodeClient.Nodes().Get(context.TODO(), o.ResourceName, metav1.GetOptions{})
if err != nil {
return err
}
nodes = append(nodes, *node)
} else {
nodeList, err := o.NodeClient.Nodes().List(context.TODO(), metav1.ListOptions{
LabelSelector: selector.String(),
})
if err != nil {
return err
}
nodes = append(nodes, nodeList.Items...)
}
availableResources := make(map[string]v1.ResourceList)
for _, n := range nodes {
if !o.ShowCapacity {
availableResources[n.Name] = n.Status.Allocatable
} else {
availableResources[n.Name] = n.Status.Capacity
}
}
return o.Printer.PrintNodeMetrics(metrics.Items, availableResources, o.NoHeaders, o.SortBy)
}
func getNodeMetricsFromMetricsAPI(metricsClient metricsclientset.Interface, resourceName string, selector labels.Selector) (*metricsapi.NodeMetricsList, error) {
var err error
versionedMetrics := &metricsV1beta1api.NodeMetricsList{}
mc := metricsClient.MetricsV1beta1()
nm := mc.NodeMetricses()
if resourceName != "" {
m, err := nm.Get(context.TODO(), resourceName, metav1.GetOptions{})
if err != nil {
return nil, err
}
versionedMetrics.Items = []metricsV1beta1api.NodeMetrics{*m}
} else {
versionedMetrics, err = nm.List(context.TODO(), metav1.ListOptions{LabelSelector: selector.String()})
if err != nil {
return nil, err
}
}
metrics := &metricsapi.NodeMetricsList{}
err = metricsV1beta1api.Convert_v1beta1_NodeMetricsList_To_metrics_NodeMetricsList(versionedMetrics, metrics, nil)
if err != nil {
return nil, err
}
return metrics, nil
}
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