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dns_server.go
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dns_server.go
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package origin
import (
"net"
"time"
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/util/wait"
cmdutil "github.com/openshift/origin/pkg/cmd/util"
"github.com/openshift/origin/pkg/dns"
)
// RunDNSServer starts the DNS server
func (c *MasterConfig) RunDNSServer() {
config, err := dns.NewServerDefaults()
if err != nil {
glog.Fatalf("Could not start DNS: %v", err)
}
switch c.Options.DNSConfig.BindNetwork {
case "tcp":
config.BindNetwork = "ip"
case "tcp4":
config.BindNetwork = "ipv4"
case "tcp6":
config.BindNetwork = "ipv6"
}
config.DnsAddr = c.Options.DNSConfig.BindAddress
config.NoRec = !c.Options.DNSConfig.AllowRecursiveQueries
_, port, err := net.SplitHostPort(c.Options.DNSConfig.BindAddress)
if err != nil {
glog.Fatalf("Could not start DNS: %v", err)
}
if port != "53" {
glog.Warningf("Binding DNS on port %v instead of 53, which may not be resolvable from all clients", port)
}
if ok, err := cmdutil.TryListen(c.Options.DNSConfig.BindNetwork, c.Options.DNSConfig.BindAddress); !ok {
glog.Warningf("Could not start DNS: %v", err)
return
}
services, err := dns.NewCachedServiceAccessor(c.InternalKubeInformers.Core().InternalVersion().Services())
if err != nil {
glog.Fatalf("Could not start DNS: failed to add ClusterIP index: %v", err)
}
endpoints, err := dns.NewCachedEndpointsAccessor(c.InternalKubeInformers.Core().InternalVersion().Endpoints())
if err != nil {
glog.Fatalf("Could not start DNS: failed to add endpoints index: %v", err)
}
go func() {
s := dns.NewServer(config, services, endpoints, "apiserver")
err := s.ListenAndServe(wait.NeverStop)
glog.Fatalf("Could not start DNS: %v", err)
}()
cmdutil.WaitForSuccessfulDial(false, "tcp", c.Options.DNSConfig.BindAddress, 100*time.Millisecond, 100*time.Millisecond, 100)
glog.Infof("DNS listening at %s", c.Options.DNSConfig.BindAddress)
}