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Upgrading

Red Hat OpenShift Service on AWS 4

Understanding upgrading options for Red Hat OpenShift Service on AWS

Red Hat OpenShift Documentation Team

Abstract

This document provides information about upgrading Red Hat OpenShift Service on AWS (ROSA) clusters.

Chapter 1. Preparing to upgrade ROSA to 4.9

Upgrading your Red Hat OpenShift Service on AWS clusters to OpenShift 4.9 requires you to evaluate and migrate your APIs as the latest version of Kubernetes has removed a significant number of APIs.

Before you can upgrade your Red Hat OpenShift Service on AWS clusters, you must update the required tools to the appropriate version.

1.1. Requirements for upgrading to OpenShift 4.9

You must meet the following requirements before upgrading a Red Hat OpenShift Service on AWS (ROSA) cluster that uses the AWS Security Token Service (STS) from version 4.8 to 4.9.

Prerequisites

  • You have installed the latest AWS CLI on your installation host.
  • You have installed 1.1.10 or later of the ROSA CLI on your installation host.
  • You have installed version 4.9 or later of the OpenShift CLI (oc) on your workstation(s) as needed.
  • You have the permissions required to update the AWS account-wide roles and policies.
  • You have access to the cluster as a user with the cluster-admin role.
  • You updated the AWS Identity and Access Management (IAM) account-wide roles and policies, including the Operator policies to version 4.9.

1.1.1. Administrator acknowledgment when upgrading to OpenShift 4.9

Red Hat OpenShift Service on AWS 4.9 uses Kubernetes 1.22, which removed a significant number of deprecated v1beta1 APIs.

Red Hat OpenShift Service on AWS 4.8.14 introduced a requirement that an administrator must provide a manual acknowledgment before the cluster can be upgraded from Red Hat OpenShift Service on AWS 4.8 to 4.9. This is to help prevent issues after upgrading to Red Hat OpenShift Service on AWS 4.9, where APIs that have been removed are still in use by workloads, tools, or other components running on or interacting with the cluster. Administrators must evaluate their cluster for any APIs in use that will be removed and migrate the affected components to use the appropriate new API version. After this is done, the administrator can provide the administrator acknowledgment.

All Red Hat OpenShift Service on AWS 4.8 clusters require this administrator acknowledgment before they can be upgraded to Red Hat OpenShift Service on AWS 4.9.

1.1.2. Removed Kubernetes APIs

Red Hat OpenShift Service on AWS 4.9 uses Kubernetes 1.22, which removed the following deprecated v1beta1 APIs. You must migrate manifests and API clients to use the v1 API version. For more information about migrating removed APIs, see the Kubernetes documentation.

Table 1.1. v1beta1 APIs removed from Kubernetes 1.22

ResourceAPINotable changes

APIService

apiregistration.k8s.io/v1beta1

No

CertificateSigningRequest

certificates.k8s.io/v1beta1

Yes

ClusterRole

rbac.authorization.k8s.io/v1beta1

No

ClusterRoleBinding

rbac.authorization.k8s.io/v1beta1

No

CSIDriver

storage.k8s.io/v1beta1

No

CSINode

storage.k8s.io/v1beta1

No

CustomResourceDefinition

apiextensions.k8s.io/v1beta1

Yes

Ingress

extensions/v1beta1

Yes

Ingress

networking.k8s.io/v1beta1

Yes

IngressClass

networking.k8s.io/v1beta1

No

Lease

coordination.k8s.io/v1beta1

No

LocalSubjectAccessReview

authorization.k8s.io/v1beta1

Yes

MutatingWebhookConfiguration

admissionregistration.k8s.io/v1beta1

Yes

PriorityClass

scheduling.k8s.io/v1beta1

No

Role

rbac.authorization.k8s.io/v1beta1

No

RoleBinding

rbac.authorization.k8s.io/v1beta1

No

SelfSubjectAccessReview

authorization.k8s.io/v1beta1

Yes

StorageClass

storage.k8s.io/v1beta1

No

SubjectAccessReview

authorization.k8s.io/v1beta1

Yes

TokenReview

authentication.k8s.io/v1beta1

No

ValidatingWebhookConfiguration

admissionregistration.k8s.io/v1beta1

Yes

VolumeAttachment

storage.k8s.io/v1beta1

No

1.2. Evaluating your cluster for removed APIs

There are several methods to help administrators identify where APIs that will be removed are in use. However, Red Hat OpenShift Service on AWS cannot identify all instances, especially workloads that are idle or external tools that are used. It is the responsibility of the administrator to properly evaluate all workloads and other integrations for instances of removed APIs.

1.2.1. Reviewing alerts to identify uses of removed APIs

The APIRemovedInNextReleaseInUse alert tells you that there are removed APIs in use on your cluster. If this alert is firing in your cluster, review the alert; take action to clear the alert by migrating manifests and API clients to use the new API version. You can use the APIRequestCount API to get more information about which APIs are in use and which workloads are using removed APIs.

1.2.2. Using APIRequestCount to identify uses of removed APIs

You can use the APIRequestCount API to track API requests and review if any of them are using one of the removed APIs.

Prerequisites

  • You must have access to the cluster as a user with the cluster-admin role.

Procedure

  • Run the following command and examine the REMOVEDINRELEASE column of the output to identify the removed APIs that are currently in use:

    $ oc get apirequestcounts

    Example output

    NAME                                        REMOVEDINRELEASE   REQUESTSINCURRENTHOUR   REQUESTSINLAST24H
    cloudcredentials.v1.operator.openshift.io                      32                      111
    ingresses.v1.networking.k8s.io                                 28                      110
    ingresses.v1beta1.extensions                1.22               16                      66
    ingresses.v1beta1.networking.k8s.io         1.22               0                       1
    installplans.v1alpha1.operators.coreos.com                     93                      167
    ...

    Note

    You can safely ignore the following entries that appear in the results:

    • system:serviceaccount:kube-system:generic-garbage-collector appears in the results because it walks through all registered APIs searching for resources to remove.
    • system:kube-controller-manager appears in the results because it walks through all resources to count them while enforcing quotas.

    You can also use -o jsonpath to filter the results:

    $ oc get apirequestcounts -o jsonpath='{range .items[?(@.status.removedInRelease!="")]}{.status.removedInRelease}{"\t"}{.metadata.name}{"\n"}{end}'

    Example output

    1.22    certificatesigningrequests.v1beta1.certificates.k8s.io
    1.22    ingresses.v1beta1.extensions
    1.22    ingresses.v1beta1.networking.k8s.io

1.2.3. Using APIRequestCount to identify which workloads are using the removed APIs

You can examine the APIRequestCount resource for a given API version to help identify which workloads are using the API.

Prerequisites

  • You must have access to the cluster as a user with the cluster-admin role.

Procedure

  • Run the following command and examine the username and userAgent fields to help identify the workloads that are using the API:

    $ oc get apirequestcounts <resource>.<version>.<group> -o yaml

    For example:

    $ oc get apirequestcounts ingresses.v1beta1.networking.k8s.io -o yaml

    You can also use -o jsonpath to extract the username values from an APIRequestCount resource:

    $ oc get apirequestcounts ingresses.v1beta1.networking.k8s.io -o jsonpath='{range ..username}{$}{"\n"}{end}' | sort | uniq

    Example output

    user1
    user2
    app:serviceaccount:delta

1.3. Migrating instances of removed APIs

For information on how to migrate removed Kubernetes APIs, see the Deprecated API Migration Guide in the Kubernetes documentation.

Chapter 2. Upgrading ROSA clusters with STS

2.1. Life cycle policies and planning

To plan an upgrade, review the Red Hat OpenShift Service on AWS update life cycle. The life cycle page includes release definitions, support and upgrade requirements, installation policy information and life cycle dates.

Upgrades are manually initiated or automatically scheduled. Red Hat Site Reliability Engineers (SREs) monitor upgrade progress and remedy any issues encountered.

2.2. Upgrading a ROSA cluster that uses STS

There are two methods to upgrade Red Hat OpenShift Service on AWS (ROSA) clusters that uses the AWS Security Token Service (STS):

  • Individual upgrades through the rosa CLI
  • Individual upgrades through the OpenShift Cluster Manager console
Note

For steps to upgrade a ROSA cluster that does not use the AWS Security Token Service (STS), see Upgrading ROSA clusters.

2.2.1. Upgrading with the rosa CLI

You can upgrade a Red Hat OpenShift Service on AWS cluster that uses the AWS Security Token Service (STS) manually by using the rosa CLI.

This method schedules the cluster for an immediate upgrade, if a more recent version is available.

Prerequisites

  • You have installed and configured the latest ROSA CLI on your installation host.
  • If you are upgrading your cluster from 4.7 to 4.8, you have upgraded the AWS Identity and Access Management (IAM) account-wide roles and policies to version 4.8. You have also updated the cloudcredential.openshift.io/upgradeable-to annotation in the CloudCredential custom resource.

Procedure

  1. To verify the current version of your cluster, enter the following command:

    $ rosa describe cluster --cluster=<cluster_name|cluster_id> 1
    1
    Replace <cluster_name|cluster_id> with the cluster name or the ID of the cluster.
  2. To verify that an upgrade is available, enter the following command:

    $ rosa list upgrade --cluster=<cluster_name|cluster_id>

    The command returns a list of versions to which the cluster can be upgraded, including a recommended version.

  3. To upgrade a cluster to the latest available version, enter the following command:

    $ rosa upgrade cluster --cluster=<cluster_name|cluster_id>

    The cluster is scheduled for an immediate upgrade. This action can take an hour or longer, depending on your workload configuration, such as pod disruption budgets.

    You will receive an email when the upgrade is complete. You can also check the status by running rosa describe cluster again from the rosa CLI or view the status in OpenShift Cluster Manager console.

2.2.2. Scheduling individual upgrades through the OpenShift Cluster Manager console

You can schedule upgrades for a Red Hat OpenShift Service on AWS cluster that uses the AWS Security Token Service (STS) manually one time by using OpenShift Cluster Manager console.

Prerequisites

  • If you are upgrading your cluster from 4.7 to 4.8, you have upgraded the AWS Identity and Access Management (IAM) account-wide roles and policies to version 4.8. You have also updated the cloudcredential.openshift.io/upgradeable-to annotation in the CloudCredential custom resource. For more information, see Preparing an upgrade from 4.7 to 4.8.

Procedure

  1. Log in to OpenShift Cluster Manager Hybrid Cloud Console.
  2. Select a cluster to upgrade.
  3. Click the Settings tab.
  4. In the Update strategy pane, select Individual Updates.
  5. Select the version you want to upgrade your cluster to. Recommended cluster upgrades appear in the UI.
  6. If you select an update version that requires approval, provide an administrator’s acknowledgment and click Approve and continue.

    For information about administrator acknowledgment, see Administrator acknowledgment when upgrading to OpenShift 4.9.

  7. In the Node draining pane, select a grace period interval from the list. The grace period enables the nodes to gracefully drain before forcing the pod eviction. The default is 1 hour.
  8. In the Update strategy pane, click Save to apply your update strategy.
  9. In the Update status pane, review the Update available information and click Update.

    Note

    The Update button is enabled only when an upgrade is available.

  10. In the Select version dialog, choose a target upgrade version and click Next.
  11. In the Schedule update dialog, schedule your cluster upgrade.

    • To upgrade within an hour, select Update now and click Next.
    • To upgrade at a later time, select Schedule a different time and set a time and date for your upgrade. Click Next to proceed to the confirmation dialog.
  12. After reviewing the version and schedule summary, select Confirm update.

    The cluster is scheduled for an upgrade to the target version. This action can take an hour or longer, depending on the selected upgrade schedule and your workload configuration, such as pod disruption budgets.

    The status is displayed in the Update status pane.

Chapter 3. Upgrading ROSA clusters

3.1. Life cycle policies and planning

To plan an upgrade, review the Red Hat OpenShift Service on AWS update life cycle. The life cycle page includes release definitions, support and upgrade requirements, installation policy information and life cycle dates.

Upgrades are manually initiated or automatically scheduled. Red Hat Site Reliability Engineers (SREs) monitor upgrade progress and remedy any issues encountered.

3.2. Upgrading a ROSA cluster

There are three methods to upgrade Red Hat OpenShift Service on AWS (ROSA) clusters:

Note

For steps to upgrade a ROSA cluster that uses the AWS Security Token Service (STS), see Upgrading ROSA clusters with STS.

3.2.1. Upgrading with the rosa CLI

You can upgrade a Red Hat OpenShift Service on AWS cluster manually by using the rosa CLI.

This method schedules the cluster for an immediate upgrade, if a more recent version is available.

Prerequisites

  • You have installed and configured the latest ROSA CLI on your installation host.

Procedure

  1. To verify the current version of your cluster, enter the following command:

    $ rosa describe cluster --cluster=<cluster_name|cluster_id> 1
    1
    Replace <cluster_name|cluster_id> with the cluster name or the ID of the cluster.
  2. To verify that an upgrade is available, enter the following command:

    $ rosa list upgrade --cluster=<cluster_name|cluster_id>

    The command returns a list of versions to which the cluster can be upgraded, including a recommended version.

  3. To upgrade a cluster to the latest available version, enter the following command:

    $ rosa upgrade cluster --cluster=<cluster_name|cluster_id>

    The cluster is scheduled for an immediate upgrade. This action can take an hour or longer, depending on your workload configuration, such as pod disruption budgets.

    You will receive an email when the upgrade is complete. You can also check the status by running rosa describe cluster again from the rosa CLI or view the status in OpenShift Cluster Manager console.

3.2.2. Scheduling individual upgrades through the OpenShift Cluster Manager console

You can schedule upgrades for a Red Hat OpenShift Service on AWS cluster manually one time by using OpenShift Cluster Manager console.

Procedure

  1. Log in to OpenShift Cluster Manager Hybrid Cloud Console.
  2. Select a cluster to upgrade.
  3. Click the Settings tab.
  4. In the Update strategy pane, select Individual Updates.
  5. Select the version you want to upgrade your cluster to. Recommended cluster upgrades appear in the UI.
  6. If you select an update version that requires approval, provide an administrator’s acknowledgment and click Approve and continue.

    For information about administrator acknowledgment, see Administrator acknowledgment when upgrading to OpenShift 4.9.

  7. In the Node draining pane, select a grace period interval from the list. The grace period enables the nodes to gracefully drain before forcing the pod eviction. The default is 1 hour.
  8. In the Update strategy pane, click Save to apply your update strategy.
  9. In the Update status pane, review the Update available information and click Update.

    Note

    The Update button is enabled only when an upgrade is available.

  10. In the Select version dialog, choose a target upgrade version and click Next.
  11. In the Schedule update dialog, schedule your cluster upgrade.

    • To upgrade within an hour, select Update now and click Next.
    • To upgrade at a later time, select Schedule a different time and set a time and date for your upgrade. Click Next to proceed to the confirmation dialog.
  12. After reviewing the version and schedule summary, select Confirm update.

    The cluster is scheduled for an upgrade to the target version. This action can take an hour or longer, depending on the selected upgrade schedule and your workload configuration, such as pod disruption budgets.

    The status is displayed in the Update status pane.

3.2.3. Scheduling recurring upgrades for your cluster

You can schedule recurring, automatic upgrades for z-stream patch versions for your Red Hat OpenShift Service on AWS cluster through the OpenShift Cluster Manager console.

Procedure

  1. Log in to OpenShift Cluster Manager Hybrid Cloud Console.
  2. Select a cluster to upgrade.
  3. Click the Settings tab.
  4. In the Update strategy pane, select Recurring updates.
  5. Select a preferred day of the week and start time for the upgrade, when updates are available.
  6. Provide an administrator’s acknowledgment and click Approve and continue. OpenShift Cluster Manager does not start scheduled y-stream updates for minor versions without receiving an administrator’s acknowledgment.

    For information about administrator acknowledgment, see Administrator acknowledgment when upgrading to OpenShift 4.9.

  7. In the Node draining pane, select a grace period interval from the list. The grace period enables the nodes to gracefully drain before forcing the pod eviction. The default is 1 hour.
  8. In the Update strategy pane, click Save to apply your update strategy.

    When upgrades are available, they are automatically applied to the cluster on the preferred day of the week and start time.

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