Back to index

4.21.0-rc.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-rc.0-x86_64
Team Approvals:

Tests:

Upgrades from:


Loading changelog, this may take a while ...

Changes from 4.21.0-ec.3

Created: 2025-12-18 19:50:11 +0000 UTC

Image Digest: sha256:ecde621d6f74aa1af4cd351f8b571ca2a61bbc32826e49cdf1b7fbff07f04ede

Components

FeatureGate Changes

FeatureGate Default
Hypershift
Default
SelfManagedHA
DevPreviewNoUpgrade
Hypershift
DevPreviewNoUpgrade
SelfManagedHA
TechPreviewNoUpgrade
Hypershift
TechPreviewNoUpgrade
SelfManagedHA
DynamicResourceAllocation
(0 tests)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
NoRegistryClusterOperations
(0 tests)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
Unconditionally Enabled
(Changed)
ImageStreamImportMode
(0 tests)
Enabled
(Changed)
Enabled
(Changed)
Enabled Enabled Enabled Enabled
SigstoreImageVerificationPKI
(0 tests)
Enabled
(Changed)
Enabled
(Changed)
Enabled Enabled Enabled Enabled
ClientsAllowCBOR
(0 tests)
Disabled Disabled Disabled
(Changed)
Disabled
(Changed)
Disabled
(Changed)
Disabled
(Changed)
VSphereMixedNodeEnv
(0 tests)
Disabled Disabled Enabled Enabled Enabled
(Changed)
Enabled
(Changed)
HyperShiftOnlyDynamicResourceAllocation
(0 tests)
Enabled
(New)
Enabled
(New)
Enabled
(New)
NewOLMBoxCutterRuntime
(0 tests)
NoRegistryClusterInstall
(0 tests)
Enabled
(New)
Enabled
(New)
OnPremDNSRecords
(0 tests)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
ProvisioningRequestAvailable
(0 tests)
Enabled
(New)
Enabled
(New)

New images

Rebuilt images without code change

agent-installer-api-server

agent-installer-csr-approver, agent-installer-orchestrator

agent-installer-node-agent

agent-installer-ui

agent-installer-utils

aws-cloud-controller-manager

aws-cluster-api-controllers

aws-ebs-csi-driver-operator, azure-disk-csi-driver-operator, azure-file-csi-driver-operator, csi-driver-manila-operator, openstack-cinder-csi-driver-operator

aws-karpenter-provider-aws

aws-machine-controllers

azure-cluster-api-controllers

azure-disk-csi-driver

azure-file-csi-driver

azure-machine-controllers

baremetal-installer, installer, installer-artifacts

baremetal-operator

baremetal-runtimecfg

cli, cli-artifacts, deployer, tools

cloud-credential-operator

cluster-authentication-operator

cluster-autoscaler

cluster-autoscaler-operator

cluster-baremetal-operator

cluster-capi-controllers

cluster-capi-operator

cluster-cloud-controller-manager-operator

cluster-config-api

cluster-config-operator

cluster-control-plane-machine-set-operator

cluster-csi-snapshot-controller-operator

cluster-dns-operator

cluster-etcd-operator

cluster-image-registry-operator

cluster-ingress-operator

cluster-kube-apiserver-operator

cluster-kube-controller-manager-operator

cluster-kube-scheduler-operator

cluster-kube-storage-version-migrator-operator

cluster-monitoring-operator

cluster-network-operator

cluster-node-tuning-operator

cluster-olm-operator

cluster-openshift-controller-manager-operator

cluster-policy-controller

cluster-samples-operator

cluster-storage-operator

cluster-update-keys

cluster-version-operator

console

console-operator

container-networking-plugins, containernetworking-plugins-microshift

coredns

csi-driver-manila, openstack-cinder-csi-driver, openstack-cloud-controller-manager

csi-driver-nfs

csi-external-snapshot-metadata

csi-external-snapshotter, csi-snapshot-controller

docker-registry

etcd

gcp-cloud-controller-manager

gcp-cluster-api-controllers

gcp-machine-controllers

gcp-pd-csi-driver

gcp-pd-csi-driver-operator

haproxy-router

hyperkube, kube-proxy, pod

hypershift

ibm-vpc-block-csi-driver-operator

ibmcloud-cluster-api-controllers

ibmcloud-machine-controllers

insights-operator

insights-runtime-exporter, insights-runtime-extractor

ironic

ironic-agent

kubevirt-cloud-controller-manager

machine-api-operator

machine-config-operator

machine-os-images

metallb-frr

monitoring-plugin

multus-admission-controller

multus-cni, multus-cni-microshift

multus-networkpolicy

multus-route-override-cni

multus-whereabouts-ipam-cni

must-gather

network-interface-bond-cni

network-metrics-daemon

network-tools

networking-console-plugin

nutanix-cloud-controller-manager

oauth-server

oc-mirror

olm-catalogd, olm-operator-controller

openshift-apiserver

openshift-controller-manager

openstack-cluster-api-controllers

openstack-machine-api-provider

operator-framework-tools, operator-lifecycle-manager, operator-registry

operator-marketplace

ovn-kubernetes, ovn-kubernetes-microshift

powervs-block-csi-driver-operator

prometheus

prometheus-config-reloader, prometheus-operator, prometheus-operator-admission-webhook

service-ca-operator

telemeter

tests

volume-data-source-validator

vsphere-cluster-api-controllers

vsphere-csi-driver, vsphere-csi-driver-syncer

vsphere-csi-driver-operator

vsphere-problem-detector


Node Image Info

Loading node image info, this may take a while ...

Package List

Full list (564 packages)

Changed:

Extensions

Full list (162 packages)


Red Hat Enterprise Linux CoreOS base layer: 9.6.20251212-1

View changelog in Markdown or 

Source code for this page located on github