func (dns *DNSServer) Start() {
if dns.done != nil {
fmt.Fprint(os.Stderr, util.Pad("DNS server already started"))
return
}
dns.done = make(chan struct{})
dns.etcd.Start()
go util.Until(dns.kube2sky, os.Stderr, "kube2sky", 2*time.Second, dns.done)
go util.Until(dns.sky.Run, os.Stderr, "skydns", 1*time.Second, dns.done)
go func() {
var err error
client := kubeClient()
meta := kube.ObjectMeta{
Name: DNSServiceName,
Namespace: DNSServiceNamespace,
Labels: map[string]string{
"k8s-app": "kube-dns",
"kubernetes.io/name": "KubeDNS",
},
}
for {
if err != nil {
time.Sleep(2 * time.Second)
}
if _, err = client.Namespaces().Get(DNSServiceNamespace); notFoundErr(err) {
err = createKubeSystemIfNotPresent(client)
if err != nil {
glog.Infof("Failed to create the kube-system namespace: %v\n", err)
continue
}
} else if err != nil {
glog.Infof("Failed to check for kube-system namespace existence: %v\n", err)
continue
}
// setup service
if _, err = client.Services(meta.Namespace).Get(meta.Name); notFoundErr(err) {
// create service if doesn't exist
err = createService(client, meta, dns.clusterIP, dns.dnsServerAddr.Port)
if err != nil {
glog.Infof("Failed to create Service for DNS: %v\n", err)
continue
}
} else if err != nil {
// error if cannot check for Service
glog.Infof("Failed to check for DNS Service existence: %v\n", err)
continue
}
// setup endpoint
if _, err = client.Endpoints(meta.Namespace).Get(meta.Name); notFoundErr(err) {
// create endpoint if doesn't exist
err = createEndpoint(client, meta, dns.dnsServerAddr.IP.String(), int32(dns.dnsServerAddr.Port))
if err != nil {
glog.Infof("Failed to create Endpoint for DNS: %v\n", err)
continue
}
} else if err != nil {
// error if cannot check for Endpoint
glog.Infof("Failed to check for DNS Endpoint existence: %v\n", err)
continue
}
// setup successful
glog.Infof("DNS started succesfully.")
break
}
}()
}
// Start calls startup function.
func (s *SimpleServer) Start() {
go util.Until(s.serverRoutine, os.Stdout, s.ComponentName, s.Interval, s.stopChannel)
}