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4.21.27

Download the installer for your operating system or run

oc adm release extract --tools quay.io/openshift-release-dev/ocp-release:4.21.27-x86_64

Qualifiers (status api):

QE

Tests:

Upgrades from:

Untested upgrades: 4.20.19, 4.20.21, 4.20.22, 4.20.23, 4.20.24, 4.20.25, 4.20.26, 4.20.27, 4.20.29, 4.21.10, 4.21.11, 4.21.12, 4.21.13, 4.21.14, 4.21.15, 4.21.16, 4.21.18, 4.21.20, 4.21.21, 4.21.22, 4.21.23, 4.21.3, 4.21.4, 4.21.5, 4.21.6, 4.21.7, 4.21.9

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Changes from 4.21.17

Created: 2026-07-30 12:51:09 +0000 UTC

Image Digest: sha256:aaeee8b27a23a8a8923ca2f37dfeabac3c716b4fbecb249f91d0b377323c87b1

Components

FeatureGate Changes

FeatureGate Default
Hypershift
Default
SelfManagedHA
DevPreviewNoUpgrade
Hypershift
DevPreviewNoUpgrade
SelfManagedHA
TechPreviewNoUpgrade
Hypershift
TechPreviewNoUpgrade
SelfManagedHA
GatewayAPIWithoutOLM
(0 tests)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)
Enabled
(New)

Rebuilt images without code change

agent-installer-api-server

agent-installer-node-agent

agent-installer-ui

agent-installer-utils

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

azure-cloud-controller-manager, azure-cloud-node-manager

azure-machine-controllers

azure-workload-identity-webhook

baremetal-installer, installer, installer-artifacts

baremetal-operator

cli, cli-artifacts, deployer, tools

cloud-credential-operator

cluster-baremetal-operator

cluster-config-api

cluster-etcd-operator

cluster-ingress-operator

cluster-kube-apiserver-operator

cluster-monitoring-operator

cluster-network-operator

cluster-node-tuning-operator

cluster-policy-controller

console

console-operator

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

csi-external-provisioner

csi-external-snapshotter, csi-snapshot-controller

egress-router-cni

gcp-pd-csi-driver-operator

haproxy-router

hyperkube, kube-proxy, pod

hypershift

insights-operator

ironic

ironic-agent

keepalived-ipfailover

kube-state-metrics

kubevirt-csi-driver

machine-api-operator

machine-config-operator

machine-os-images

monitoring-plugin

multus-cni, multus-cni-microshift

networking-console-plugin

oauth-server

oc-mirror

olm-catalogd, olm-operator-controller

openshift-apiserver

openstack-machine-api-provider

ovn-kubernetes, ovn-kubernetes-microshift

powervs-cloud-controller-manager

prometheus

prometheus-alertmanager

route-controller-manager

tests

vsphere-problem-detector


Node Image Info

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Red Hat Enterprise Linux CoreOS (rhel-coreos)

Package List

Full list (569 packages)

Changed:

Extensions

Full list (162 packages)

Red Hat Enterprise Linux CoreOS 10.2 (rhel-coreos-10)

Package List

Full list (489 packages)

Changed:

Added:

Extensions

Full list (207 packages)


Red Hat Enterprise Linux CoreOS base layer: 10.2.20260521-0


OCPBUGS-87873: Add support for hermetic builds via Cachi2 prefetched CoreOS base layer: ISOs #97

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