func main() {
flag.Parse()
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 := 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 := NewBackend()
s := server.New(backend, config)
stats.Collect() // Graphite
server.Metrics() // Prometheus
if err := s.Run(); err != nil {
log.Fatalf("skydns: %s", err)
}
}
func (d *Domain) Run() {
for i, j := range d.entries {
logger.Info("%s %v", i, j)
}
server.Metrics()
server.SetDefaults(d.DNSConfig)
s := server.New(d, d.DNSConfig)
s.Run()
}
// ListenAndServe starts a DNS server that exposes services and values stored in etcd (if etcdclient
// is not nil). It will block until the server exits.
// TODO: hoist the service accessor out of this package so it can be reused.
func ListenAndServe(config *server.Config, client *client.Client, etcdclient *etcd.Client) error {
stop := make(chan struct{})
accessor := NewCachedServiceAccessor(client, stop)
resolver := NewServiceResolver(config, accessor, client, openshiftFallback)
resolvers := server.FirstBackend{resolver}
if etcdclient != nil {
resolvers = append(resolvers, backendetcd.NewBackend(etcdclient, &backendetcd.Config{
Ttl: config.Ttl,
Priority: config.Priority,
}))
}
server.Metrics()
s := server.New(resolvers, config)
defer close(stop)
return s.Run()
}
func main() {
flag.Parse()
machines := strings.Split(machine, ",")
client := newClient(machines, tlspem, tlskey, cacert)
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, &backendetcd.Config{
Ttl: config.Ttl,
Priority: config.Priority,
})
s := server.New(backend, config)
if discover {
go func() {
recv := make(chan *etcd.Response)
go client.Watch("/_etcd/machines/", 0, true, recv, nil)
duration := 1 * time.Second
for {
select {
case n := <-recv:
if n != nil {
if client := updateClient(n, tlskey, tlspem, cacert); client != nil {
backend.UpdateClient(client)
}
duration = 1 * time.Second // reset
} else {
// we can see an n == nil, probably when we can't connect to etcd.
log.Printf("skydns: etcd machine cluster 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
}
}
}
}
}()
}
if stub {
s.UpdateStubZones()
go func() {
recv := make(chan *etcd.Response)
go client.Watch(msg.Path(config.Domain)+"/dns/stub/", 0, true, recv, nil)
duration := 1 * time.Second
for {
select {
case n := <-recv:
if n != nil {
s.UpdateStubZones()
log.Printf("skydns: stubzone update")
duration = 1 * time.Second // reset
} else {
// we can see an n == nil, probably when we can't connect to etcd.
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
}
}
}
}
}()
}
stats.Collect() // Graphite
server.Metrics() // Prometheus
if err := s.Run(); err != nil {
log.Fatalf("skydns: %s", err)
}
}