func (d *KubeDNSServer) startSkyDNSServer() {
skydnsConfig := &server.Config{Domain: d.domain, DnsAddr: "0.0.0.0:53"}
server.SetDefaults(skydnsConfig)
s := server.New(d.kd, skydnsConfig)
if err := metrics.Metrics(); err != nil {
glog.Fatalf("skydns: %s", err)
} else {
glog.Infof("skydns: metrics enabled on :%s%s", metrics.Port, metrics.Path)
}
go s.Run()
}
func (d *KubeDNSServer) startSkyDNSServer() {
glog.Infof("Starting SkyDNS server. Listening on port:%d", d.dnsPort)
skydnsConfig := &server.Config{Domain: d.domain, DnsAddr: fmt.Sprintf("0.0.0.0:%d", d.dnsPort)}
server.SetDefaults(skydnsConfig)
s := server.New(d.kd, skydnsConfig)
if err := metrics.Metrics(); err != nil {
glog.Fatalf("skydns: %s", err)
}
glog.Infof("skydns: metrics enabled on : %s:%s", metrics.Path, metrics.Port)
go s.Run()
}
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()
}
func TestMetrics(t *testing.T) {
s := newTestServer(t, false)
defer s.Stop()
metrics.Port = "12300"
metrics.Subsystem = "test"
metrics.Namespace = "test"
metrics.Metrics()
query("miek.nl.", dns.TypeMX)
v0 := scrape(t, "test_test_dns_request_count_total{system=\"recursive\"}")
query("miek.nl.", dns.TypeMX)
v1 := scrape(t, "test_test_dns_request_count_total{system=\"recursive\"}")
if v1 != v0+1 {
t.Fatalf("expecting %d, got %d", v0+1, v1)
}
}
func (lk LocalkubeServer) NewDNSServer(rootDomain, clusterIP, kubeAPIServer string) (*DNSServer, error) {
// setup backing etcd store
peerURLs := []string{"http://localhost:9256"}
DNSEtcdURLs := []string{"http://localhost:49090"}
publicIP, err := lk.GetHostIP()
if err != nil {
return nil, err
}
serverAddress := fmt.Sprintf("%s:%d", publicIP.String(), 53)
etcdServer, err := lk.NewEtcd(DNSEtcdURLs, peerURLs, DNSName, lk.GetDNSDataDirectory())
if err != nil {
return nil, err
}
// setup skydns
cfg := etcd.Config{
Endpoints: DNSEtcdURLs,
Transport: etcd.DefaultTransport,
}
etcdClient, err := etcd.New(cfg)
if err != nil {
return nil, err
}
keysApi := etcd.NewKeysAPI(etcdClient)
skyConfig := &skydns.Config{
DnsAddr: serverAddress,
Domain: rootDomain,
}
dnsAddress, err := net.ResolveUDPAddr("udp", serverAddress)
if err != nil {
return nil, err
}
skydns.SetDefaults(skyConfig)
backend := backendetcd.NewBackend(
keysApi,
context.Background(),
&backendetcd.Config{
Ttl: skyConfig.Ttl,
Priority: skyConfig.Priority,
})
skyServer := skydns.New(backend, skyConfig)
// setup so prometheus doesn't run into nil
metrics.Metrics()
// setup kube2sky
k2s := kube2sky.NewKube2Sky(rootDomain, DNSEtcdURLs[0], "", kubeAPIServer, 10*time.Second, 8081)
return &DNSServer{
etcd: etcdServer,
sky: skyServer,
kube2sky: k2s,
dnsServerAddr: dnsAddress,
clusterIP: clusterIP,
}, nil
}
func main() {
flag.Parse()
machines := strings.Split(machine, ",")
client, err := newEtcdClient(machines, tlspem, tlskey, cacert)
if err != nil {
panic(err)
}
if nameserver != "" {
for _, hostPort := range strings.Split(nameserver, ",") {
if err := validateHostPort(hostPort); err != nil {
log.Fatalf("skydns: nameserver is invalid: %s", err)
}
config.Nameservers = append(config.Nameservers, hostPort)
}
}
if err := validateHostPort(config.DnsAddr); err != nil {
log.Fatalf("skydns: addr is invalid: %s", err)
}
if err := loadConfig(client, config); err != nil {
log.Fatalf("skydns: %s", err)
}
if err := server.SetDefaults(config); err != nil {
log.Fatalf("skydns: defaults could not be set from /etc/resolv.conf: %v", err)
}
if config.Local != "" {
config.Local = dns.Fqdn(config.Local)
}
backend := backendetcd.NewBackend(client, ctx, &backendetcd.Config{
Ttl: config.Ttl,
Priority: config.Priority,
})
s := server.New(backend, config)
if stub {
s.UpdateStubZones()
go func() {
duration := 1 * time.Second
var watcher etcd.Watcher
watcher = client.Watcher(msg.Path(config.Domain)+"/dns/stub/", &etcd.WatcherOptions{AfterIndex: 0, Recursive: true})
for {
_, err := watcher.Next(ctx)
if err != nil {
//
log.Printf("skydns: stubzone update failed, sleeping %s + ~3s", duration)
time.Sleep(duration + (time.Duration(rand.Float32() * 3e9))) // Add some random.
duration *= 2
if duration > 32*time.Second {
duration = 32 * time.Second
}
} else {
s.UpdateStubZones()
log.Printf("skydns: stubzone update")
duration = 1 * time.Second // reset
}
}
}()
}
if err := metrics.Metrics(); err != nil {
log.Fatalf("skydns: %s", err)
} else {
log.Printf("skydns: metrics enabled on :%s%s", metrics.Port, metrics.Path)
}
if err := s.Run(); err != nil {
log.Fatalf("skydns: %s", err)
}
}
func main() {
flag.Parse()
if config.Version {
fmt.Printf("skydns server version: %s\n", server.Version)
os.Exit(0)
}
machines := strings.Split(machine, ",")
var clientptr *etcdv3.Client
var err error
var clientv3 etcdv3.Client
var clientv2 etcd.KeysAPI
if config.Etcd3 {
clientptr, err = newEtcdV3Client(machines, tlspem, tlskey, cacert)
clientv3 = *clientptr
} else {
clientv2, err = newEtcdV2Client(machines, tlspem, tlskey, cacert, username, password)
}
if err != nil {
panic(err)
}
if nameserver != "" {
for _, hostPort := range strings.Split(nameserver, ",") {
if err := validateHostPort(hostPort); err != nil {
log.Fatalf("skydns: nameserver is invalid: %s", err)
}
config.Nameservers = append(config.Nameservers, hostPort)
}
}
if err := validateHostPort(config.DnsAddr); err != nil {
log.Fatalf("skydns: addr is invalid: %s", err)
}
if config.Etcd3 {
if err := loadEtcdV3Config(clientv3, config); err != nil {
log.Fatalf("skydns: %s", err)
}
} else {
if err := loadEtcdV2Config(clientv2, config); err != nil {
log.Fatalf("skydns: %s", err)
}
}
if err := server.SetDefaults(config); err != nil {
log.Fatalf("skydns: defaults could not be set from /etc/resolv.conf: %v", err)
}
if config.Local != "" {
config.Local = dns.Fqdn(config.Local)
}
var backend server.Backend
if config.Etcd3 {
backend = backendetcdv3.NewBackendv3(clientv3, ctx, &backendetcdv3.Config{
Ttl: config.Ttl,
Priority: config.Priority,
})
} else {
backend = backendetcd.NewBackend(clientv2, ctx, &backendetcd.Config{
Ttl: config.Ttl,
Priority: config.Priority,
})
}
s := server.New(backend, config)
if stub {
s.UpdateStubZones()
go func() {
duration := 1 * time.Second
if config.Etcd3 {
var watcher etcdv3.WatchChan
watcher = clientv3.Watch(ctx, msg.Path(config.Domain)+"/dns/stub/", etcdv3.WithPrefix())
for wresp := range watcher {
if wresp.Err() != nil {
log.Printf("skydns: stubzone update failed, sleeping %s + ~3s", duration)
time.Sleep(duration + (time.Duration(rand.Float32() * 3e9)))
duration *= 2
if duration > 32*time.Second {
duration = 32 * time.Second
}
} else {
s.UpdateStubZones()
log.Printf("skydns: stubzone update")
duration = 1 * time.Second //reset
}
}
} else {
var watcher etcd.Watcher
watcher = clientv2.Watcher(msg.Path(config.Domain)+"/dns/stub/", &etcd.WatcherOptions{AfterIndex: 0, Recursive: true})
for {
_, err := watcher.Next(ctx)
if err != nil {
//
log.Printf("skydns: stubzone update failed, sleeping %s + ~3s", duration)
time.Sleep(duration + (time.Duration(rand.Float32() * 3e9))) // Add some random.
duration *= 2
if duration > 32*time.Second {
duration = 32 * time.Second
}
} else {
s.UpdateStubZones()
log.Printf("skydns: stubzone update")
duration = 1 * time.Second // reset
}
}
}
}()
}
if err := metrics.Metrics(); err != nil {
log.Fatalf("skydns: %s", err)
} else {
log.Printf("skydns: metrics enabled on :%s%s", metrics.Port, metrics.Path)
}
if err := s.Run(); err != nil {
log.Fatalf("skydns: %s", err)
}
}
