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