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4.21.0-ec.0

Download the installer for your operating system or run

oc adm release extract --tools quay.io/openshift-release-dev/ocp-release:4.21.0-ec.0-s390x
Team Approvals:

No tests for this release

Upgrades from:

Untested upgrades: 4.20.0-rc.1, 4.20.0-rc.2, 4.20.0-rc.3

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Changes from 4.21.0-0.nightly-s390x-2025-10-22-031809

Created: 2025-09-17 00:42:16 +0000 UTC

Image Digest: sha256:254783c8928b9d8b0ed4cb5257602c8995fa721b1f3b8c83b9a49690f5ccdd79

Components

FeatureGate Changes

FeatureGate Default
Hypershift
Default
SelfManagedHA
DevPreviewNoUpgrade
Hypershift
DevPreviewNoUpgrade
SelfManagedHA
TechPreviewNoUpgrade
Hypershift
TechPreviewNoUpgrade
SelfManagedHA
CBORServingAndStorage
(0 tests)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
ClientsAllowCBOR
(0 tests)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
ClientsPreferCBOR
(0 tests)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
ClusterAPIMachineManagementVSphere
(0 tests)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
EventTTL
(0 tests)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
ManagedBootImagesCPMS
(0 tests)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
ExternalOIDCWithUIDAndExtraClaimMappings
(5 tests)
Disabled
(Changed)
Disabled
(Changed)
Enabled Enabled Enabled Enabled
GCPClusterHostedDNSInstall
(0 tests)
Disabled
(Changed)
Disabled
(Changed)
Enabled Enabled Enabled Enabled
ManagedBootImagesAzure
(0 tests)
Disabled
(Changed)
Disabled
(Changed)
Enabled Enabled Enabled Enabled
ManagedBootImagesvSphere
(6 tests)
Disabled
(Changed)
Disabled
(Changed)
Enabled Enabled Enabled Enabled
PreconfiguredUDNAddresses
(6 tests)
Disabled
(Changed)
Disabled
(Changed)
Enabled Enabled Enabled Enabled
VolumeAttributesClass
(50 tests)
Disabled
(Changed)
Disabled
(Changed)
Enabled Enabled Enabled Enabled
ExternalOIDC
(9 tests)
Enabled Disabled
(Changed)
Enabled Enabled Enabled Enabled
NewOLMWebhookProviderOpenshiftServiceCA
(0 tests)
Disabled Disabled
(Changed)
Disabled Enabled Disabled Enabled
IngressControllerLBSubnetsAWS
(0 tests)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
SetEIPForNLBIngressController
(0 tests)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
InsightsConfigAPI
(0 tests)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
NodeSwap
(0 tests)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)

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Package List

Full list (539 packages)

Changed:

Extensions

Full list (143 packages)


Red Hat Enterprise Linux CoreOS base layer: 9.6.20250904-0

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