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kube-proxy: initialization wait for service and endpoint handlers synced

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Ensure kube-proxy waits for the services/endpointslices informer
caches to be synced *and* all pre-sync events delivered before
setting isInitialized=true. Otherwise, in clusters with many services,
some services may be missing from svcPortMap when kube-proxy starts
(e.g. during daemonset rollout). This can cause kube-proxy to temporarily
remove service DNAT rules and then skip cleanup of UDP conntrack entries
to a service VIP.

Resolves: https://github.com/kubernetes/kubernetes/issues/126468
This commit is contained in:
Will Daly 2024-07-30 10:07:05 -07:00
parent 8991b8ea60
commit f520ede814
1 changed files with 8 additions and 6 deletions
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10
pkg/proxy/config/config.go
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@ -78,11 +78,10 @@ type EndpointSliceConfig struct {
// NewEndpointSliceConfig creates a new EndpointSliceConfig.
func NewEndpointSliceConfig(ctx context.Context, endpointSliceInformer discoveryv1informers.EndpointSliceInformer, resyncPeriod time.Duration) *EndpointSliceConfig {
result := &EndpointSliceConfig{
listerSynced: endpointSliceInformer.Informer().HasSynced,
logger: klog.FromContext(ctx),
}
_, _ = endpointSliceInformer.Informer().AddEventHandlerWithResyncPeriod(
handlerRegistration, _ := endpointSliceInformer.Informer().AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: result.handleAddEndpointSlice,
UpdateFunc: result.handleUpdateEndpointSlice,
@ -91,6 +90,8 @@ func NewEndpointSliceConfig(ctx context.Context, endpointSliceInformer discovery
resyncPeriod,
)
result.listerSynced = handlerRegistration.HasSynced
return result
}
@ -171,11 +172,10 @@ type ServiceConfig struct {
// NewServiceConfig creates a new ServiceConfig.
func NewServiceConfig(ctx context.Context, serviceInformer v1informers.ServiceInformer, resyncPeriod time.Duration) *ServiceConfig {
result := &ServiceConfig{
listerSynced: serviceInformer.Informer().HasSynced,
logger: klog.FromContext(ctx),
}
_, _ = serviceInformer.Informer().AddEventHandlerWithResyncPeriod(
handlerRegistration, _ := serviceInformer.Informer().AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: result.handleAddService,
UpdateFunc: result.handleUpdateService,
@ -184,6 +184,8 @@ func NewServiceConfig(ctx context.Context, serviceInformer v1informers.ServiceIn
resyncPeriod,
)
result.listerSynced = handlerRegistration.HasSynced
return result
}