Issued:
2021-05-26
Updated:
2021-05-26

RHBA-2021:1565 - OpenShift Container Platform 4.6.30 bug fix update

Synopsis

OpenShift Container Platform 4.6.30 bug fix update

Type/Severity

Bug Fix Advisory None

Topic

Red Hat OpenShift Container Platform release 4.6.30 is now available with updates to packages and images that fix several bugs.

Description

Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.

This advisory contains the container images for Red Hat OpenShift Container Platform 4.6.30. See the following advisory for the RPM packages for this release:

https://access.redhat.com/errata/RHSA-2021:1566

Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes:

https://docs.openshift.com/container-platform/4.6/release_notes/ocp-4-6-release-notes.html

This update fixes the following bugs among others:

  • Previously, the cluster upstream resolver returned a DNS response that exceeded 512 bytes via UDP. As a result, CoreDNS sometimes returned the error SERVFAIL, logged various error messages, or both. These errors sometimes forced the client to retry over TCP. With this release, the CoreDNS bufsize plugin is enabled with a UDP buffer size of 1232 bytes, and CoreDNS is less likely to return the error SERVFAIL or present any runtime errors when handling large DNS responses via UDP. This change also reduces the likelihood of UDP packet fragmentation. (BZ#1955632)

  • Previously, the kubelet would sometimes overwhelm the API servers by opening a large number of watch requests for secrets and config maps, particularly on node reboot. With this release, the number of kubelet watch requests is reduced to decrease the load on API servers. (BZ#1960002)

You may download the oc tool and use it to inspect release image metadata as follows:

(For x86_64 architecture)

  $ oc adm release info

quay.io/openshift-release-dev/ocp-release:4.6.30-x86_64

The image digest is sha256:476588ee99a28f39410372175925672e9a37f0cd1272e17ed2454d7f5cafff90
(For s390x architecture)

  $ oc adm release info

quay.io/openshift-release-dev/ocp-release:4.6.30-s390x

The image digest is sha256:875779e511fa23d0bf0fe74cc4d350d29089e82621d62c60c40d8ddbfc374d88

(For ppc64le architecture)

  $ oc adm release info

quay.io/openshift-release-dev/ocp-release:4.6.30-ppc64le

The image digest is sha256:57b3d96e119f998d9549a15981a4baf416659fe4cfdf248f69e6591bc6c596b8

All OpenShift Container Platform 4.6 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift Console or the CLI oc command. Instructions for upgrading a cluster are available at This page is not included, but the link has been rewritten to point to the nearest parent document.https://docs.openshift.com/container-platform/4.6/updating/updating-cluster-between-minor.html#understanding-upgrade-channels_updating-cluster-between-minor

Solution

For OpenShift Container Platform 4.6 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:

https://docs.openshift.com/container-platform/4.6/release_notes/ocp-4-6-release-notes.html

Details on how to access this content are available at https://docs.openshift.com/container-platform/4.6/updating/updating-cluster-cli.html

Affected Products

ProductVersionArch
Red Hat OpenShift Container Platform4.6x86_64
Red Hat OpenShift Container Platform for Power4.6ppc64le
Red Hat OpenShift Container Platform for IBM Z and LinuxONE4.6s390x

Fixes

CVEs

(none)

References

(none)

Additional information