func (a *BalancerAgent) start() error {
controller, err := etcdcontrol.NewListener(a.store, a.errorSink)
if err != nil {
return err
}
a.controller = controller
a.stop = make(chan struct{})
a.services = make(chan Services, 1)
go a.updater()
go a.generator()
return nil
}
func (d *BalancerDaemon) parseArgs(args []string) error {
fs := flag.NewFlagSet(args[0], flag.ContinueOnError)
var promCf prometheus.Config
var debug bool
// The bridge specified should be the one where packets sent
// to service IP addresses go. So even with weave, that's
// typically 'docker0'.
fs.StringVar(&d.netConfig.bridge,
"bridge", "docker0", "bridge device")
fs.StringVar(&d.netConfig.chain,
"chain", "FLUX", "iptables chain name")
fs.StringVar(&promCf.ListenAddr,
"listen-prometheus", "",
"listen for connections from Prometheus on this IP address and port; e.g., :9000")
fs.StringVar(&promCf.AdvertiseAddr,
"advertise-prometheus", "",
"IP address and port to advertise to Prometheus; e.g. 192.168.42.221:9000")
fs.BoolVar(&debug, "debug", false, "output debugging logs")
if err := fs.Parse(args[1:]); err != nil {
return err
}
if fs.NArg() > 0 {
return fmt.Errorf("excess command line arguments")
}
if debug {
log.SetLevel(log.DebugLevel)
}
log.Debug("Debug logging on")
etcdclient, err := etcdutil.NewClientFromEnv()
if err != nil {
return err
}
d.controller, err = etcdcontrol.NewListener(etcdstore.New(etcdclient),
d.errorSink)
if err != nil {
return err
}
if promCf.ListenAddr == "" {
if promCf.AdvertiseAddr != "" {
return fmt.Errorf("-advertise-prometheus option must be accompanied by -listen-prometheus")
}
d.eventHandler = eventlogger.EventLogger{}
} else {
if promCf.AdvertiseAddr == "" {
promCf.AdvertiseAddr = promCf.ListenAddr
}
promCf.ErrorSink = d.errorSink
promCf.EtcdClient = etcdclient
handler, err := prometheus.NewEventHandler(promCf)
if err != nil {
return err
}
d.eventHandler = handler
}
return nil
}