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server.go
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server.go
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/*
Copyright 2016 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 app
import (
"fmt"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/golang/glog"
"github.com/skynetservices/skydns/metrics"
"github.com/skynetservices/skydns/server"
"github.com/spf13/pflag"
"k8s.io/kubernetes/cmd/kube-dns/app/options"
"k8s.io/kubernetes/pkg/api/unversioned"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/client/restclient"
kclientcmd "k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
kdns "k8s.io/kubernetes/pkg/dns"
dnsConfig "k8s.io/kubernetes/pkg/dns/config"
)
type KubeDNSServer struct {
// DNS domain name.
domain string
healthzPort int
dnsBindAddress string
dnsPort int
kd *kdns.KubeDNS
}
func NewKubeDNSServerDefault(config *options.KubeDNSConfig) *KubeDNSServer {
ks := KubeDNSServer{domain: config.ClusterDomain}
kubeClient, err := newKubeClient(config)
if err != nil {
glog.Fatalf("Failed to create a kubernetes client: %v", err)
}
ks.healthzPort = config.HealthzPort
ks.dnsBindAddress = config.DNSBindAddress
ks.dnsPort = config.DNSPort
var configSync dnsConfig.Sync
if config.ConfigMap == "" {
glog.V(0).Infof("ConfigMap not configured, using values from command line flags")
configSync = dnsConfig.NewNopSync(
&dnsConfig.Config{Federations: config.Federations})
} else {
glog.V(0).Infof("Using configuration read from ConfigMap: %v:%v",
config.ConfigMapNs, config.ConfigMap)
configSync = dnsConfig.NewSync(
kubeClient, config.ConfigMapNs, config.ConfigMap)
}
ks.kd = kdns.NewKubeDNS(kubeClient, config.ClusterDomain, configSync)
return &ks
}
// TODO: evaluate using pkg/client/clientcmd
func newKubeClient(dnsConfig *options.KubeDNSConfig) (clientset.Interface, error) {
var (
config *restclient.Config
err error
)
if dnsConfig.KubeMasterURL != "" && dnsConfig.KubeConfigFile == "" {
// Only --kube-master-url was provided.
config = &restclient.Config{
Host: dnsConfig.KubeMasterURL,
ContentConfig: restclient.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: "v1"}},
}
} else {
// We either have:
// 1) --kube-master-url and --kubecfg-file
// 2) just --kubecfg-file
// 3) neither flag
// In any case, the logic is the same. If (3), this will automatically
// fall back on the service account token.
overrides := &kclientcmd.ConfigOverrides{}
overrides.ClusterInfo.Server = dnsConfig.KubeMasterURL // might be "", but that is OK
rules := &kclientcmd.ClientConfigLoadingRules{ExplicitPath: dnsConfig.KubeConfigFile} // might be "", but that is OK
if config, err = kclientcmd.NewNonInteractiveDeferredLoadingClientConfig(rules, overrides).ClientConfig(); err != nil {
return nil, err
}
}
glog.V(0).Infof("Using %v for kubernetes master, kubernetes API: %v",
config.Host, config.GroupVersion)
return clientset.NewForConfig(config)
}
func (server *KubeDNSServer) Run() {
pflag.VisitAll(func(flag *pflag.Flag) {
glog.V(0).Infof("FLAG: --%s=%q", flag.Name, flag.Value)
})
setupSignalHandlers()
server.startSkyDNSServer()
server.kd.Start()
server.setupHandlers()
glog.V(0).Infof("Status HTTP port %v", server.healthzPort)
glog.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", server.healthzPort), nil))
}
// setupHealthzHandlers sets up a readiness and liveness endpoint for kube2sky.
func (server *KubeDNSServer) setupHandlers() {
glog.V(0).Infof("Setting up Healthz Handler (/readiness)")
http.HandleFunc("/readiness", func(w http.ResponseWriter, req *http.Request) {
fmt.Fprintf(w, "ok\n")
})
glog.V(0).Infof("Setting up cache handler (/cache)")
http.HandleFunc("/cache", func(w http.ResponseWriter, req *http.Request) {
serializedJSON, err := server.kd.GetCacheAsJSON()
if err == nil {
fmt.Fprint(w, serializedJSON)
} else {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(w, err)
}
})
}
// setupSignalHandlers installs signal handler to ignore SIGINT and
// SIGTERM. This daemon will be killed by SIGKILL after the grace
// period to allow for some manner of graceful shutdown.
func setupSignalHandlers() {
sigChan := make(chan os.Signal)
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
go func() {
glog.V(0).Infof("Ignoring signal %v (can only be terminated by SIGKILL)", <-sigChan)
}()
}
func (d *KubeDNSServer) startSkyDNSServer() {
glog.V(0).Infof("Starting SkyDNS server (%v:%v)", d.dnsBindAddress, d.dnsPort)
skydnsConfig := &server.Config{
Domain: d.domain,
DnsAddr: fmt.Sprintf("%s:%d", d.dnsBindAddress, d.dnsPort),
}
server.SetDefaults(skydnsConfig)
s := server.New(d.kd, skydnsConfig)
if err := metrics.Metrics(); err != nil {
glog.Fatalf("Skydns metrics error: %s", err)
} else if metrics.Port != "" {
glog.V(0).Infof("Skydns metrics enabled (%v:%v)", metrics.Path, metrics.Port)
} else {
glog.V(0).Infof("Skydns metrics not enabled")
}
go s.Run()
}