✨ add namespace filtering #11370

marek-veber · 2024-11-04T12:25:54Z

What this PR does / why we need it:
This PR adds an option --excluded-namespace=<comma separated list of namespaces>

Which issue(s) this PR fixes:
Fixes #11193

/area/clusterresourceset

linux-foundation-easycla · 2024-11-04T12:26:00Z

The committers listed above are authorized under a signed CLA.

✅ login: marek-veber / name: Marek Veber (4c5ea6f)

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sbueringer · 2024-11-04T13:03:30Z

I don't have time to contribute to this now / until code freeze / PTO / .. but let's please make sure we have a very clear understanding how whatever filtering we do works across:

the cache
the cached client (mgr.GetClient)
all our controllers (event filtering)
ClusterCache
every other part of Cluster API that is affected

I think something like the cache and the event filtering in our controller watches and especially all the calls we do on the cached client have to be carefully orchestrated with each other. Today we have a lot of options for performance improvements, these might go away if we surface the wrong configuration options to end users.

fabriziopandini · 2024-11-04T15:33:32Z

Let's also try to get a better understanding of the use case we are trying to address, because our current stance is that support for running multiple instances of Cluster API is should be considered best-effort + the issue linked above are not really well harmonised in term of requirements and proposed solution.

BTW, above statement, and the fact that as @sbueringer noted this is way trickier than it could appear at first sight, are the same reason why we have a few other long standing feature request in this area

JoelSpeed · 2024-11-05T11:12:47Z

bootstrap/kubeadm/main.go

@@ -122,6 +125,9 @@ func InitFlags(fs *pflag.FlagSet) {
 	fs.StringVar(&watchFilterValue, "watch-filter", "",
 		fmt.Sprintf("Label value that the controller watches to reconcile cluster-api objects. Label key is always %s. If unspecified, the controller watches for all cluster-api objects.", clusterv1.WatchLabel))

+	fs.StringVar(&watchFilterExcludedNamespaces, "excluded-namespaces", "",


Is there a StringSliceVar? We are using pflag so I think there is

JoelSpeed · 2024-11-05T11:19:47Z

util/predicates/generic_predicates.go

+func ResourceHasFilterExcludeNamespaces(scheme *runtime.Scheme, logger logr.Logger, excludedNamespaces []string) predicate.Funcs {
+	return predicate.Funcs{
+		UpdateFunc: func(e event.UpdateEvent) bool {
+			return processIfNamespaceExcluded(scheme, logger.WithValues("predicate", "ResourceHasFilterExcludeNamespaces", "eventType", "update"), e.ObjectNew, excludedNamespaces)
+		},
+		CreateFunc: func(e event.CreateEvent) bool {
+			return processIfNamespaceExcluded(scheme, logger.WithValues("predicate", "ResourceHasFilterExcludeNamespaces", "eventType", "create"), e.Object, excludedNamespaces)
+		},
+		DeleteFunc: func(e event.DeleteEvent) bool {
+			return processIfNamespaceExcluded(scheme, logger.WithValues("predicate", "ResourceHasFilterExcludeNamespaces", "eventType", "delete"), e.Object, excludedNamespaces)
+		},
+		GenericFunc: func(e event.GenericEvent) bool {
+			return processIfNamespaceExcluded(scheme, logger.WithValues("predicate", "ResourceHasFilterExcludeNamespaces", "eventType", "generic"), e.Object, excludedNamespaces)
+		},
+	}
+}
+


I don't think this is the right approach to solving this issue. The suggestion in #11193 uses the FieldSelector concept of an API request to filter resources at the API server level, rather than the controller level.

Given the scale potential here, I think we want to follow that suggestion and move the filtering to the API server where possible.

I'm not sure if that approach also has RBAC advantages, perhaps we don't need permissions on the excluded namespace? But that could also be an advantage of the approach as suggested by Alberto

Thanks, @JoelSpeed! Please take a look at the new approach in this PR.

neolit123 · 2024-11-11T12:27:37Z

bootstrap/kubeadm/main.go

@@ -122,6 +124,9 @@ func InitFlags(fs *pflag.FlagSet) {
 	fs.StringVar(&watchFilterValue, "watch-filter", "",
 		fmt.Sprintf("Label value that the controller watches to reconcile cluster-api objects. Label key is always %s. If unspecified, the controller watches for all cluster-api objects.", clusterv1.WatchLabel))

+	fs.StringSliceVar(&watchFilterExcludedNamespaces, "excluded-namespaces", nil,


should it be excluded-namespace (singular, but still a comma separated list) to match the existing flag namespace, which cannot be changed to namespaces without a breaking change?

✨ update the --namespace <namespace> option to accept a comma-separated list for watching multiple selected namespaces #11397

changed --excluded-namespaces -> --excluded-namespace

sbueringer · 2024-11-11T12:29:04Z

/hold
xref: #11370 (comment) #11370 (comment)
(just to make sure these comments are not getting missed)

neolit123 · 2024-11-11T12:31:21Z

i recall recent discussions in core k8s on a KEP somewhere that this pattern is not preferred i.e. adding both an allow list and a deny list flag at the same time.

how about keeping this simple and doing the following:

--namespace not specified == watch all NS
--namespace specifies some NS as a comma separated list == only watch those NS

that means for a NS to be watched it must be in the --namespace list.
downside of that is that a controller restart is needed every time a new NS must be watched.
then again, same goes for anytime you need to exclude a certain NS.

marek-veber · 2024-11-11T13:00:59Z

We also need the following behavior (I’ve split it into two separate PRs):

If --namespace is not specified, it defaults to watching all namespaces.
Use --exclude-namespace=ns1,ns2,... to watch all namespaces except specified ones (e.g., ns1, ns2).

Additionally, there’s a more flexible option, see: #7775 (comment) that allows for more complex conditions. However, it doesn’t seem to support using a direct "positive" list of namespaces to watch.

fabriziopandini · 2024-11-13T16:09:52Z

+1 to what @sbueringer said
we should not add flags until we have a clear idea of what we want to achieve.
also, as written in a few comments, this is not as simple as adding a flag.

k8s-ci-robot · 2024-11-21T14:30:02Z

PR needs rebase.

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JoelSpeed reviewed Nov 5, 2024

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marek-veber changed the title ~~add namespace filtering ✨~~ (:sparkles:) add namespace filtering Nov 6, 2024

marek-veber changed the title ~~(:sparkles:) add namespace filtering~~ ✨ add namespace filtering Nov 6, 2024

marek-veber force-pushed the namespace-filtering branch from 84ef63f to beba100 Compare November 6, 2024 16:29

k8s-ci-robot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. labels Nov 6, 2024

marek-veber force-pushed the namespace-filtering branch from beba100 to bbd7909 Compare November 11, 2024 08:39

neolit123 reviewed Nov 11, 2024

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add namespace filtering

4c5ea6f

marek-veber force-pushed the namespace-filtering branch from bbd7909 to 4c5ea6f Compare November 11, 2024 13:34

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✨ add namespace filtering #11370

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