mirror of
https://github.com/k3s-io/kubernetes.git
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98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"flag"
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"fmt"
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"os"
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"strings"
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"time"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
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"github.com/golang/glog"
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)
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var (
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token = flag.String("token", "", "Bearer token for authentication to the API server.")
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server = flag.String("server", "", "The address and port of the Kubernetes API server")
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namespace = flag.String("namespace", api.NamespaceDefault, "The namespace containing Elasticsearch pods")
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selector = flag.String("selector", "", "Selector (label query) for selecting Elasticsearch pods")
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)
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func main() {
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flag.Parse()
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glog.Info("Elasticsearch discovery")
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apiServer := *server
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if apiServer == "" {
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kubernetesService := os.Getenv("KUBERNETES_SERVICE_HOST")
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if kubernetesService == "" {
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glog.Fatalf("Please specify the Kubernetes server with --server")
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}
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apiServer = fmt.Sprintf("https://%s:%s", kubernetesService, os.Getenv("KUBERNETES_SERVICE_PORT"))
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}
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glog.Infof("Server: %s", apiServer)
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glog.Infof("Namespace: %q", *namespace)
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glog.Infof("selector: %q", *selector)
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config := client.Config{
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Host: apiServer,
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BearerToken: *token,
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Insecure: true,
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}
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c, err := client.New(&config)
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if err != nil {
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glog.Fatalf("Failed to make client: %v", err)
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}
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l, err := labels.Parse(*selector)
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if err != nil {
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glog.Fatalf("Failed to parse selector %q: %v", *selector, err)
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}
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pods, err := c.Pods(*namespace).List(l, fields.Everything())
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if err != nil {
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glog.Fatalf("Failed to list pods: %v", err)
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}
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glog.Infof("Elasticsearch pods in namespace %s with selector %q", *namespace, *selector)
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podIPs := []string{}
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for i := range pods.Items {
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p := &pods.Items[i]
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for attempt := 0; attempt < 10; attempt++ {
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glog.Infof("%d: %s PodIP: %s", i, p.Name, p.Status.PodIP)
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if p.Status.PodIP != "" {
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podIPs = append(podIPs, fmt.Sprintf(`"%s"`, p.Status.PodIP))
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break
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}
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time.Sleep(1 * time.Second)
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p, err = c.Pods(*namespace).Get(p.Name)
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if err != nil {
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glog.Warningf("Failed to get pod %s: %v", p.Name, err)
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}
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}
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if p.Status.PodIP == "" {
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glog.Warningf("Failed to obtain PodIP for %s", p.Name)
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}
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}
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fmt.Printf("discovery.zen.ping.unicast.hosts: [%s]\n", strings.Join(podIPs, ", "))
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}
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