96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
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/*
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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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"log"
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"os"
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"os/exec"
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"reflect"
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"text/template"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/apis/extensions"
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client "k8s.io/kubernetes/pkg/client/unversioned"
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"k8s.io/kubernetes/pkg/util"
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)
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const (
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nginxConf = `
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events {
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worker_connections 1024;
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}
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http {
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# http://nginx.org/en/docs/http/ngx_http_core_module.html
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types_hash_max_size 2048;
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server_names_hash_max_size 512;
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server_names_hash_bucket_size 64;
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{{range $ing := .Items}}
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{{range $rule := $ing.Spec.Rules}}
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server {
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listen 80;
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server_name {{$rule.Host}};
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{{ range $path := $rule.HTTP.Paths }}
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location {{$path.Path}} {
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proxy_set_header Host $host;
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proxy_pass http://{{$path.Backend.ServiceName}}.{{$ing.Namespace}}.svc.cluster.local:{{$path.Backend.ServicePort}};
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}{{end}}
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}{{end}}{{end}}
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}`
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)
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func shellOut(cmd string) {
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out, err := exec.Command("sh", "-c", cmd).CombinedOutput()
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if err != nil {
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log.Fatalf("Failed to execute %v: %v, err: %v", cmd, string(out), err)
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}
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}
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func main() {
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var ingClient client.IngressInterface
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if kubeClient, err := client.NewInCluster(); err != nil {
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log.Fatalf("Failed to create client: %v.", err)
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} else {
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ingClient = kubeClient.Extensions().Ingress(api.NamespaceAll)
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}
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tmpl, _ := template.New("nginx").Parse(nginxConf)
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rateLimiter := util.NewTokenBucketRateLimiter(0.1, 1)
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known := &extensions.IngressList{}
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// Controller loop
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shellOut("nginx")
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for {
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rateLimiter.Accept()
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ingresses, err := ingClient.List(api.ListOptions{})
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if err != nil {
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log.Printf("Error retrieving ingresses: %v", err)
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continue
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}
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if reflect.DeepEqual(ingresses.Items, known.Items) {
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continue
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}
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known = ingresses
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if w, err := os.Create("/etc/nginx/nginx.conf"); err != nil {
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log.Fatalf("Failed to open %v: %v", nginxConf, err)
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} else if err := tmpl.Execute(w, ingresses); err != nil {
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log.Fatalf("Failed to write template %v", err)
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}
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shellOut("nginx -s reload")
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}
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}
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