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kubelet request certificates if at least one IP exist

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A Kubernetes Node requires to have at minimum one IP address
because those are used on the Pods field HostIPs and in some cases,
when pods uses hostNetwork: true, as PodIPs.
Nodes that use IP addresses as Hostname are interpreted as an IP
address, so it is possible that are nodes that don't hane any DNSname.

The feature gate AllowDNSOnlyNodeCSR will allow user to opt-in for
the old behavior.

Change-Id: I094531d87246f1e7a5ef4fe57bd5d9840cb1375d
This commit is contained in:
Antonio Ojea
2024-06-30 14:50:46 +00:00
parent 29e4f5a893
commit bc63c412b9
3 changed files with 183 additions and 15 deletions
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9
pkg/features/kube_features.go
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@@ -45,6 +45,13 @@ const (
// Enable usage of Provision of PVCs from snapshots in other namespaces
CrossNamespaceVolumeDataSource featuregate.Feature = "CrossNamespaceVolumeDataSource"
// owner: @aojea
// Deprecated: v1.31
//
// Allow kubelet to request a certificate without any Node IP available, only
// with DNS names.
AllowDNSOnlyNodeCSR featuregate.Feature = "AllowDNSOnlyNodeCSR"
// owner: @thockin
// deprecated: v1.29
//
@@ -983,6 +990,8 @@ func init() {
var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{
CrossNamespaceVolumeDataSource: {Default: false, PreRelease: featuregate.Alpha},
AllowDNSOnlyNodeCSR: {Default: false, PreRelease: featuregate.Deprecated}, // remove after 1.33
AllowServiceLBStatusOnNonLB: {Default: false, PreRelease: featuregate.Deprecated}, // remove after 1.29
AnyVolumeDataSource: {Default: true, PreRelease: featuregate.Beta}, // on by default in 1.24