func (s *scheduler) remoteSync(shutdown <-chan interface{}, local client.Connection) {
for {
select {
case remote := <-zzk.Connect("/", zzk.GetRemoteConnection):
if remote != nil {
s.monitorRemote(shutdown, remote, local)
}
case <-shutdown:
return
}
select {
case <-shutdown:
return
default:
// probably lost connection to the remote; try again
}
}
}
// main loop of the HostAgent
func (a *HostAgent) Start(shutdown <-chan interface{}) {
glog.Info("Starting HostAgent")
var wg sync.WaitGroup
defer func() {
glog.Info("Waiting for agent routines...")
wg.Wait()
glog.Info("Agent routines ended")
}()
wg.Add(1)
go func() {
glog.Info("reapOldContainersLoop starting")
a.reapOldContainersLoop(time.Minute, shutdown)
glog.Info("reapOldContainersLoop Done")
wg.Done()
}()
// Increase the number of maximal tracked connections for iptables
maxConnections := "655360"
if cnxns := strings.TrimSpace(os.Getenv("SERVICED_IPTABLES_MAX_CONNECTIONS")); cnxns != "" {
maxConnections = cnxns
}
glog.Infof("Set sysctl maximum tracked connections for iptables to %s", maxConnections)
utils.SetSysctl("net.netfilter.nf_conntrack_max", maxConnections)
// Clean up any extant iptables chain, just in case
a.servicedChain.Remove()
// Add our chain for assigned IP rules
if err := a.servicedChain.Inject(); err != nil {
glog.Errorf("Error creating SERVICED iptables chain (%v)", err)
}
// Clean up when we're done
defer a.servicedChain.Remove()
for {
// handle shutdown if we are waiting for a zk connection
var conn coordclient.Connection
select {
case conn = <-zzk.Connect(zzk.GeneratePoolPath(a.poolID), zzk.GetLocalConnection):
case <-shutdown:
return
}
if conn == nil {
continue
}
glog.Info("Got a connected client")
// watch virtual IP zookeeper nodes
virtualIPListener := virtualips.NewVirtualIPListener(a, a.hostID)
// watch docker action nodes
actionListener := zkdocker.NewActionListener(a, a.hostID)
// watch the host state nodes
// this blocks until
// 1) has a connection
// 2) its node is registered
// 3) receieves signal to shutdown or breaks
hsListener := zkservice.NewHostStateListener(a, a.hostID)
glog.Infof("Host Agent successfully started")
zzk.Start(shutdown, conn, hsListener, virtualIPListener, actionListener)
select {
case <-shutdown:
glog.Infof("Host Agent shutting down")
return
default:
glog.Infof("Host Agent restarting")
}
}
}