// Returns whatever error occurred along with a boolean indicator of whether it
// should be retried.
func (s *ServiceController) createLoadBalancerIfNeeded(key string, service *api.Service) (error, bool) {
// Note: It is safe to just call EnsureLoadBalancer. But, on some clouds that requires a delete & create,
// which may involve service interruption. Also, we would like user-friendly events.
// Save the state so we can avoid a write if it doesn't change
previousState := api.LoadBalancerStatusDeepCopy(&service.Status.LoadBalancer)
if !wantsLoadBalancer(service) {
needDelete := true
_, exists, err := s.balancer.GetLoadBalancer(s.clusterName, service)
if err != nil {
return fmt.Errorf("Error getting LB for service %s: %v", key, err), retryable
}
if !exists {
needDelete = false
}
if needDelete {
glog.Infof("Deleting existing load balancer for service %s that no longer needs a load balancer.", key)
s.eventRecorder.Event(service, api.EventTypeNormal, "DeletingLoadBalancer", "Deleting load balancer")
if err := s.balancer.EnsureLoadBalancerDeleted(s.clusterName, service); err != nil {
return err, retryable
}
s.eventRecorder.Event(service, api.EventTypeNormal, "DeletedLoadBalancer", "Deleted load balancer")
}
service.Status.LoadBalancer = api.LoadBalancerStatus{}
} else {
glog.V(2).Infof("Ensuring LB for service %s", key)
// TODO: We could do a dry-run here if wanted to avoid the spurious cloud-calls & events when we restart
// The load balancer doesn't exist yet, so create it.
s.eventRecorder.Event(service, api.EventTypeNormal, "CreatingLoadBalancer", "Creating load balancer")
err := s.createLoadBalancer(service)
if err != nil {
return fmt.Errorf("Failed to create load balancer for service %s: %v", key, err), retryable
}
s.eventRecorder.Event(service, api.EventTypeNormal, "CreatedLoadBalancer", "Created load balancer")
}
// Write the state if changed
// TODO: Be careful here ... what if there were other changes to the service?
if !api.LoadBalancerStatusEqual(previousState, &service.Status.LoadBalancer) {
if err := s.persistUpdate(service); err != nil {
return fmt.Errorf("Failed to persist updated status to apiserver, even after retries. Giving up: %v", err), notRetryable
}
} else {
glog.V(2).Infof("Not persisting unchanged LoadBalancerStatus to registry.")
}
return nil, notRetryable
}
// Returns whatever error occurred along with a boolean indicator of whether it
// should be retried.
func (s *ServiceController) createLoadBalancerIfNeeded(namespacedName types.NamespacedName, service, appliedState *api.Service) (error, bool) {
if appliedState != nil && !s.needsUpdate(appliedState, service) {
glog.Infof("LB doesn't need update for service %s", namespacedName)
return nil, notRetryable
}
// Note: It is safe to just call EnsureLoadBalancer. But, on some clouds that requires a delete & create,
// which may involve service interruption. Also, we would like user-friendly events.
// Save the state so we can avoid a write if it doesn't change
previousState := api.LoadBalancerStatusDeepCopy(&service.Status.LoadBalancer)
if wantsLoadBalancer(service) {
glog.V(2).Infof("Ensuring LB for service %s", namespacedName)
// TODO: We could do a dry-run here if wanted to avoid the spurious cloud-calls & events when we restart
// The load balancer doesn't exist yet, so create it.
s.eventRecorder.Event(service, api.EventTypeNormal, "CreatingLoadBalancer", "Creating load balancer")
err := s.createLoadBalancer(service)
if err != nil {
return fmt.Errorf("failed to create load balancer for service %s: %v", namespacedName, err), retryable
}
s.eventRecorder.Event(service, api.EventTypeNormal, "CreatedLoadBalancer", "Created load balancer")
} else {
needDelete := true
if appliedState != nil {
if !wantsLoadBalancer(appliedState) {
needDelete = false
}
} else {
// If we don't have any cached memory of the load balancer, we have to ask
// the cloud provider for what it knows about it.
// Technically EnsureLoadBalancerDeleted can cope, but we want to post meaningful events
_, exists, err := s.balancer.GetLoadBalancer(service)
if err != nil {
return fmt.Errorf("error getting LB for service %s: %v", namespacedName, err), retryable
}
if !exists {
needDelete = false
}
}
if needDelete {
glog.Infof("Deleting existing load balancer for service %s that no longer needs a load balancer.", namespacedName)
s.eventRecorder.Event(service, api.EventTypeNormal, "DeletingLoadBalancer", "Deleting load balancer")
if err := s.balancer.EnsureLoadBalancerDeleted(service); err != nil {
return err, retryable
}
s.eventRecorder.Event(service, api.EventTypeNormal, "DeletedLoadBalancer", "Deleted load balancer")
}
service.Status.LoadBalancer = api.LoadBalancerStatus{}
}
// Write the state if changed
// TODO: Be careful here ... what if there were other changes to the service?
if api.LoadBalancerStatusEqual(previousState, &service.Status.LoadBalancer) {
glog.V(2).Infof("Not persisting unchanged LoadBalancerStatus to registry.")
} else {
if err := s.persistUpdate(service); err != nil {
return fmt.Errorf("failed to persist updated status to apiserver, even after retries. Giving up: %v", err), notRetryable
}
}
return nil, notRetryable
}
// Returns whatever error occurred along with a boolean indicator of whether it
// should be retried.
func (s *ServiceController) createLoadBalancerIfNeeded(namespacedName types.NamespacedName, service, cachedService *api.Service) (error, bool) {
if cachedService != nil && !needsUpdate(cachedService, service) {
glog.Infof("LB already exists and doesn't need update for service %s", namespacedName)
return nil, notRetryable
}
if cachedService != nil {
// If the service already exists but needs to be updated, delete it so that
// we can recreate it cleanly.
if wantsExternalLoadBalancer(cachedService) {
glog.Infof("Deleting existing load balancer for service %s that needs an updated load balancer.", namespacedName)
if err := s.balancer.EnsureTCPLoadBalancerDeleted(s.loadBalancerName(cachedService), s.zone.Region); err != nil {
return err, retryable
}
}
} else {
// If we don't have any cached memory of the load balancer, we have to ask
// the cloud provider for what it knows about it.
status, exists, err := s.balancer.GetTCPLoadBalancer(s.loadBalancerName(service), s.zone.Region)
if err != nil {
return fmt.Errorf("Error getting LB for service %s: %v", namespacedName, err), retryable
}
if exists && api.LoadBalancerStatusEqual(status, &service.Status.LoadBalancer) {
glog.Infof("LB already exists with status %s for previously uncached service %s", status, namespacedName)
return nil, notRetryable
} else if exists {
glog.Infof("Deleting old LB for previously uncached service %s whose endpoint %s doesn't match the service's desired IPs %v",
namespacedName, status, service.Spec.DeprecatedPublicIPs)
if err := s.balancer.EnsureTCPLoadBalancerDeleted(s.loadBalancerName(service), s.zone.Region); err != nil {
return err, retryable
}
}
}
// Save the state so we can avoid a write if it doesn't change
previousState := api.LoadBalancerStatusDeepCopy(&service.Status.LoadBalancer)
if !wantsExternalLoadBalancer(service) {
glog.Infof("Not creating LB for service %s that doesn't want one.", namespacedName)
service.Status.LoadBalancer = api.LoadBalancerStatus{}
} else {
glog.V(2).Infof("Creating LB for service %s", namespacedName)
// The load balancer doesn't exist yet, so create it.
err := s.createExternalLoadBalancer(service)
if err != nil {
return fmt.Errorf("failed to create external load balancer for service %s: %v", namespacedName, err), retryable
}
}
// Write the state if changed
// TODO: Be careful here ... what if there were other changes to the service?
if !api.LoadBalancerStatusEqual(previousState, &service.Status.LoadBalancer) {
if err := s.persistUpdate(service); err != nil {
return fmt.Errorf("Failed to persist updated status to apiserver, even after retries. Giving up: %v", err), notRetryable
}
} else {
glog.Infof("Not persisting unchanged LoadBalancerStatus to registry.")
}
return nil, notRetryable
}