mirror of
https://github.com/k3s-io/kubernetes.git
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129 lines
3.7 KiB
Go
129 lines
3.7 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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"strconv"
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"strings"
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"time"
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"github.com/golang/glog"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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restclient "k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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clientapi "k8s.io/client-go/tools/clientcmd/api"
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api "k8s.io/kubernetes/pkg/apis/core"
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clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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)
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func buildConfigFromEnvs(masterURL, kubeconfigPath string) (*restclient.Config, error) {
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if kubeconfigPath == "" && masterURL == "" {
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kubeconfig, err := restclient.InClusterConfig()
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if err != nil {
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return nil, err
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}
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return kubeconfig, nil
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}
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return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
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&clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeconfigPath},
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&clientcmd.ConfigOverrides{ClusterInfo: clientapi.Cluster{Server: masterURL}}).ClientConfig()
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}
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func flattenSubsets(subsets []api.EndpointSubset) []string {
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ips := []string{}
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for _, ss := range subsets {
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for _, addr := range ss.Addresses {
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ips = append(ips, fmt.Sprintf(`"%s"`, addr.IP))
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}
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}
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return ips
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}
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func main() {
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flag.Parse()
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glog.Info("Kubernetes Elasticsearch logging discovery")
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cc, err := buildConfigFromEnvs(os.Getenv("APISERVER_HOST"), os.Getenv("KUBE_CONFIG_FILE"))
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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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client, err := clientset.NewForConfig(cc)
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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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namespace := metav1.NamespaceSystem
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envNamespace := os.Getenv("NAMESPACE")
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if envNamespace != "" {
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if _, err := client.Core().Namespaces().Get(envNamespace, metav1.GetOptions{}); err != nil {
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glog.Fatalf("%s namespace doesn't exist: %v", envNamespace, err)
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}
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namespace = envNamespace
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}
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var elasticsearch *api.Service
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serviceName := os.Getenv("ELASTICSEARCH_SERVICE_NAME")
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if serviceName == "" {
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serviceName = "elasticsearch-logging"
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}
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// Look for endpoints associated with the Elasticsearch logging service.
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// First wait for the service to become available.
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for t := time.Now(); time.Since(t) < 5*time.Minute; time.Sleep(10 * time.Second) {
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elasticsearch, err = client.Core().Services(namespace).Get(serviceName, metav1.GetOptions{})
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if err == nil {
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break
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}
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}
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// If we did not find an elasticsearch logging service then log a warning
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// and return without adding any unicast hosts.
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if elasticsearch == nil {
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glog.Warningf("Failed to find the elasticsearch-logging service: %v", err)
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return
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}
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var endpoints *api.Endpoints
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addrs := []string{}
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// Wait for some endpoints.
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count, _ := strconv.Atoi(os.Getenv("MINIMUM_MASTER_NODES"))
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for t := time.Now(); time.Since(t) < 5*time.Minute; time.Sleep(10 * time.Second) {
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endpoints, err = client.Core().Endpoints(namespace).Get(serviceName, metav1.GetOptions{})
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if err != nil {
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continue
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}
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addrs = flattenSubsets(endpoints.Subsets)
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glog.Infof("Found %s", addrs)
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if len(addrs) > 0 && len(addrs) == count {
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break
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}
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}
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// If there was an error finding endpoints then log a warning and quit.
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if err != nil {
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glog.Warningf("Error finding endpoints: %v", err)
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return
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}
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glog.Infof("Endpoints = %s", addrs)
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fmt.Printf("discovery.zen.ping.unicast.hosts: [%s]\n", strings.Join(addrs, ", "))
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}
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