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clusterinfo.go
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clusterinfo.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 cmd
import (
"fmt"
"io"
"strconv"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilnet "k8s.io/apimachinery/pkg/util/net"
restclient "k8s.io/client-go/rest"
"k8s.io/kubernetes/pkg/api/legacyscheme"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/resource"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
ct "github.com/daviddengcn/go-colortext"
"github.com/spf13/cobra"
)
var (
longDescr = templates.LongDesc(i18n.T(`
Display addresses of the master and services with label kubernetes.io/cluster-service=true
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.`))
clusterinfoExample = templates.Examples(i18n.T(`
# Print the address of the master and cluster services
kubectl cluster-info`))
)
type ClusterInfoOptions struct {
genericclioptions.IOStreams
Namespace string
Builder *resource.Builder
Client *restclient.Config
}
func NewCmdClusterInfo(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
o := &ClusterInfoOptions{
IOStreams: ioStreams,
}
cmd := &cobra.Command{
Use: "cluster-info",
Short: i18n.T("Display cluster info"),
Long: longDescr,
Example: clusterinfoExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd))
cmdutil.CheckErr(o.Run())
},
}
cmd.AddCommand(NewCmdClusterInfoDump(f, ioStreams))
return cmd
}
func (o *ClusterInfoOptions) Complete(f cmdutil.Factory, cmd *cobra.Command) error {
var err error
o.Client, err = f.ToRESTConfig()
if err != nil {
return err
}
cmdNamespace := cmdutil.GetFlagString(cmd, "namespace")
if cmdNamespace == "" {
cmdNamespace = metav1.NamespaceSystem
}
o.Namespace = cmdNamespace
o.Builder = f.NewBuilder()
return nil
}
func (o *ClusterInfoOptions) Run() error {
// TODO use generalized labels once they are implemented (#341)
b := o.Builder.
WithScheme(legacyscheme.Scheme).
NamespaceParam(o.Namespace).DefaultNamespace().
LabelSelectorParam("kubernetes.io/cluster-service=true").
ResourceTypeOrNameArgs(false, []string{"services"}...).
Latest()
err := b.Do().Visit(func(r *resource.Info, err error) error {
if err != nil {
return err
}
printService(o.Out, "Kubernetes master", o.Client.Host)
services := r.Object.(*api.ServiceList).Items
for _, service := range services {
var link string
if len(service.Status.LoadBalancer.Ingress) > 0 {
ingress := service.Status.LoadBalancer.Ingress[0]
ip := ingress.IP
if ip == "" {
ip = ingress.Hostname
}
for _, port := range service.Spec.Ports {
link += "http://" + ip + ":" + strconv.Itoa(int(port.Port)) + " "
}
} else {
name := service.ObjectMeta.Name
if len(service.Spec.Ports) > 0 {
port := service.Spec.Ports[0]
// guess if the scheme is https
scheme := ""
if port.Name == "https" || port.Port == 443 {
scheme = "https"
}
// format is <scheme>:<service-name>:<service-port-name>
name = utilnet.JoinSchemeNamePort(scheme, service.ObjectMeta.Name, port.Name)
}
if len(o.Client.GroupVersion.Group) == 0 {
link = o.Client.Host + "/api/" + o.Client.GroupVersion.Version + "/namespaces/" + service.ObjectMeta.Namespace + "/services/" + name + "/proxy"
} else {
link = o.Client.Host + "/api/" + o.Client.GroupVersion.Group + "/" + o.Client.GroupVersion.Version + "/namespaces/" + service.ObjectMeta.Namespace + "/services/" + name + "/proxy"
}
}
name := service.ObjectMeta.Labels["kubernetes.io/name"]
if len(name) == 0 {
name = service.ObjectMeta.Name
}
printService(o.Out, name, link)
}
return nil
})
o.Out.Write([]byte("\nTo further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.\n"))
return err
// TODO consider printing more information about cluster
}
func printService(out io.Writer, name, link string) {
ct.ChangeColor(ct.Green, false, ct.None, false)
fmt.Fprint(out, name)
ct.ResetColor()
fmt.Fprint(out, " is running at ")
ct.ChangeColor(ct.Yellow, false, ct.None, false)
fmt.Fprint(out, link)
ct.ResetColor()
fmt.Fprintln(out, "")
}