SupportConsoleDevelopersStart a trialContact

Chapter 18. Topology Aware Lifecycle Manager for cluster updates

You can use the Topology Aware Lifecycle Manager (TALM) to manage the software lifecycle of multiple single-node OpenShift clusters. TALM uses Red Hat Advanced Cluster Management (RHACM) policies to perform changes on the target clusters.

Important

Topology Aware Lifecycle Manager is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

18.1. About the Topology Aware Lifecycle Manager configuration

The Topology Aware Lifecycle Manager (TALM) manages the deployment of Red Hat Advanced Cluster Management (RHACM) policies for one or more OpenShift Container Platform clusters. Using TALM in a large network of clusters allows the phased rollout of policies to the clusters in limited batches. This helps to minimize possible service disruptions when updating. With TALM, you can control the following actions:

  • The timing of the update
  • The number of RHACM-managed clusters
  • The subset of managed clusters to apply the policies to
  • The update order of the clusters
  • The set of policies remediated to the cluster
  • The order of policies remediated to the cluster

TALM supports the orchestration of the OpenShift Container Platform y-stream and z-stream updates, and day-two operations on y-streams and z-streams.

18.2. About managed policies used with Topology Aware Lifecycle Manager

The Topology Aware Lifecycle Manager (TALM) uses RHACM policies for cluster updates.

TALM can be used to manage the rollout of any policy CR where the remediationAction field is set to inform. Supported use cases include the following:

  • Manual user creation of policy CRs
  • Automatically generated policies from the PolicyGenTemplate custom resource definition (CRD)

For policies that update an Operator subscription with manual approval, TALM provides additional functionality that approves the installation of the updated Operator.

For more information about managed policies, see Policy Overview in the RHACM documentation.

For more information about the PolicyGenTemplate CRD, see the "About the PolicyGenTemplate CRD" section in "Configuring managed clusters with policies and PolicyGenTemplate resources".

18.3. Installing the Topology Aware Lifecycle Manager by using the web console

You can use the OpenShift Container Platform web console to install the Topology Aware Lifecycle Manager.

Prerequisites

  • Install the latest version of the RHACM Operator.
  • Set up a hub cluster with disconnected regitry.
  • Log in as a user with cluster-admin privileges.

Procedure

  1. In the OpenShift Container Platform web console, navigate to Operators OperatorHub.
  2. Search for the Topology Aware Lifecycle Manager from the list of available Operators, and then click Install.
  3. Keep the default selection of Installation mode ["All namespaces on the cluster (default)"] and Installed Namespace ("openshift-operators") to ensure that the Operator is installed properly.
  4. Click Install.

Verification

To confirm that the installation is successful:

  1. Navigate to the Operators Installed Operators page.
  2. Check that the Operator is installed in the All Namespaces namespace and its status is Succeeded.

If the Operator is not installed successfully:

  1. Navigate to the Operators Installed Operators page and inspect the Status column for any errors or failures.
  2. Navigate to the Workloads Pods page and check the logs in any containers in the cluster-group-upgrades-controller-manager pod that are reporting issues.

18.4. Installing the Topology Aware Lifecycle Manager by using the CLI

You can use the OpenShift CLI (oc) to install the Topology Aware Lifecycle Manager (TALM).

Prerequisites

  • Install the OpenShift CLI (oc).
  • Install the latest version of the RHACM Operator.
  • Set up a hub cluster with disconnected registry.
  • Log in as a user with cluster-admin privileges.

Procedure

  1. Create a Subscription CR:

    1. Define the Subscription CR and save the YAML file, for example, talm-subscription.yaml: 

      apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: openshift-topology-aware-lifecycle-manager-subscription
  namespace: openshift-operators
spec:
  channel: "stable"
  name: topology-aware-lifecycle-manager
  source: redhat-operators
  sourceNamespace: openshift-marketplace

    2. Create the Subscription CR by running the following command: 

      $ oc create -f talm-subscription.yaml

Verification

  1. Verify that the installation succeeded by inspecting the CSV resource: 

    $ oc get csv -n openshift-operators

    Example output

    NAME                                                   DISPLAY                            VERSION               REPLACES                           PHASE
topology-aware-lifecycle-manager.4.11.x   Topology Aware Lifecycle Manager   4.11.x                                      Succeeded

  2. Verify that the TALM is up and running: 

    $ oc get deploy -n openshift-operators

    Example output

    NAMESPACE                                          NAME                                             READY   UP-TO-DATE   AVAILABLE   AGE
openshift-operators                                cluster-group-upgrades-controller-manager        1/1     1            1           14s

18.5. About the ClusterGroupUpgrade CR

The Topology Aware Lifecycle Manager (TALM) builds the remediation plan from the ClusterGroupUpgrade CR for a group of clusters. You can define the following specifications in a ClusterGroupUpgrade CR:

  • Clusters in the group
  • Blocking ClusterGroupUpgrade CRs
  • Applicable list of managed policies
  • Number of concurrent updates
  • Applicable canary updates
  • Actions to perform before and after the update
  • Update timing

As TALM works through remediation of the policies to the specified clusters, the ClusterGroupUpgrade CR can have the following states:

  • UpgradeNotStarted
  • UpgradeCannotStart
  • UpgradeNotComplete
  • UpgradeTimedOut
  • UpgradeCompleted
  • PrecachingRequired
Note

After TALM completes a cluster update, the cluster does not update again under the control of the same ClusterGroupUpgrade CR. You must create a new ClusterGroupUpgrade CR in the following cases:

  • When you need to update the cluster again
  • When the cluster changes to non-compliant with the inform policy after being updated

18.5.1. The UpgradeNotStarted state

The initial state of the ClusterGroupUpgrade CR is UpgradeNotStarted.

TALM builds a remediation plan based on the following fields:

  • The clusterSelector field specifies the labels of the clusters that you want to update.
  • The clusters field specifies a list of clusters to update.
  • The canaries field specifies the clusters for canary updates.
  • The maxConcurrency field specifies the number of clusters to update in a batch.

You can use the clusters and the clusterSelector fields together to create a combined list of clusters.

The remediation plan starts with the clusters listed in the canaries field. Each canary cluster forms a single-cluster batch.

Note

Any failures during the update of a canary cluster stops the update process.

The ClusterGroupUpgrade CR transitions to the UpgradeNotCompleted state after the remediation plan is successfully created and after the enable field is set to true. At this point, TALM starts to update the non-compliant clusters with the specified managed policies.

Note

You can only make changes to the spec fields if the ClusterGroupUpgrade CR is either in the UpgradeNotStarted or the UpgradeCannotStart state.

Sample ClusterGroupUpgrade CR in the UpgradeNotStarted state

apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-upgrade-complete
  namespace: default
spec:
  clusters: 1
  - spoke1
  enable: false
  managedPolicies: 2
  - policy1-common-cluster-version-policy
  - policy2-common-nto-sub-policy
  remediationStrategy: 3
    canaries: 4
      - spoke1
    maxConcurrency: 1 5
    timeout: 240
status: 6
  conditions:
  - message: The ClusterGroupUpgrade CR is not enabled
    reason: UpgradeNotStarted
    status: "False"
    type: Ready
  copiedPolicies:
  - cgu-upgrade-complete-policy1-common-cluster-version-policy
  - cgu-upgrade-complete-policy2-common-nto-sub-policy
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy2-common-nto-sub-policy
    namespace: default
  placementBindings:
  - cgu-upgrade-complete-policy1-common-cluster-version-policy
  - cgu-upgrade-complete-policy2-common-nto-sub-policy
  placementRules:
  - cgu-upgrade-complete-policy1-common-cluster-version-policy
  - cgu-upgrade-complete-policy2-common-nto-sub-policy
  remediationPlan:
  - - spoke1

1
Defines the list of clusters to update.
2
Lists the user-defined set of policies to remediate.
3
Defines the specifics of the cluster updates.
4
Defines the clusters for canary updates.
5
Defines the maximum number of concurrent updates in a batch. The number of remediation batches is the number of canary clusters, plus the number of clusters, except the canary clusters, divided by the maxConcurrency value. The clusters that are already compliant with all the managed policies are excluded from the remediation plan.
6
Displays information about the status of the updates.

18.5.2. The UpgradeCannotStart state

In the UpgradeCannotStart state, the update cannot start because of the following reasons:

  • Blocking CRs are missing from the system
  • Blocking CRs have not yet finished

18.5.3. The UpgradeNotCompleted state

In the UpgradeNotCompleted state, TALM enforces the policies following the remediation plan defined in the UpgradeNotStarted state.

Enforcing the policies for subsequent batches starts immediately after all the clusters of the current batch are compliant with all the managed policies. If the batch times out, TALM moves on to the next batch. The timeout value of a batch is the spec.timeout field divided by the number of batches in the remediation plan.

Note

The managed policies apply in the order that they are listed in the managedPolicies field in the ClusterGroupUpgrade CR. One managed policy is applied to the specified clusters at a time. After the specified clusters comply with the current policy, the next managed policy is applied to the next non-compliant cluster.

Sample ClusterGroupUpgrade CR in the UpgradeNotCompleted state

apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-upgrade-complete
  namespace: default
spec:
  clusters:
  - spoke1
  enable: true 1
  managedPolicies:
  - policy1-common-cluster-version-policy
  - policy2-common-nto-sub-policy
  remediationStrategy:
    maxConcurrency: 1
    timeout: 240
status: 2
  conditions:
  - message: The ClusterGroupUpgrade CR has upgrade policies that are still non compliant
    reason: UpgradeNotCompleted
    status: "False"
    type: Ready
  copiedPolicies:
  - cgu-upgrade-complete-policy1-common-cluster-version-policy
  - cgu-upgrade-complete-policy2-common-nto-sub-policy
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy2-common-nto-sub-policy
    namespace: default
  placementBindings:
  - cgu-upgrade-complete-policy1-common-cluster-version-policy
  - cgu-upgrade-complete-policy2-common-nto-sub-policy
  placementRules:
  - cgu-upgrade-complete-policy1-common-cluster-version-policy
  - cgu-upgrade-complete-policy2-common-nto-sub-policy
  remediationPlan:
  - - spoke1
  status:
    currentBatch: 1
    remediationPlanForBatch: 3
      spoke1: 0

1
The update starts when the value of the spec.enable field is true.
2
The status fields change accordingly when the update begins.
3
Lists the clusters in the batch and the index of the policy that is being currently applied to each cluster. The index of the policies starts with 0 and the index follows the order of the status.managedPoliciesForUpgrade list.

18.5.4. The UpgradeTimedOut state

In the UpgradeTimedOut state, TALM checks every hour if all the policies for the ClusterGroupUpgrade CR are compliant. The checks continue until the ClusterGroupUpgrade CR is deleted or the updates are completed. The periodic checks allow the updates to complete if they get prolonged due to network, CPU, or other issues.

TALM transitions to the UpgradeTimedOut state in two cases:

  • When the current batch contains canary updates and the cluster in the batch does not comply with all the managed policies within the batch timeout.
  • When the clusters do not comply with the managed policies within the timeout value specified in the remediationStrategy field.

If the policies are compliant, TALM transitions to the UpgradeCompleted state.

18.5.5. The UpgradeCompleted state

In the UpgradeCompleted state, the cluster updates are complete.

Sample ClusterGroupUpgrade CR in the UpgradeCompleted state

apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-upgrade-complete
  namespace: default
spec:
  actions:
    afterCompletion:
      deleteObjects: true 1
  clusters:
  - spoke1
  enable: true
  managedPolicies:
  - policy1-common-cluster-version-policy
  - policy2-common-nto-sub-policy
  remediationStrategy:
    maxConcurrency: 1
    timeout: 240
status: 2
  conditions:
  - message: The ClusterGroupUpgrade CR has all clusters compliant with all the managed policies
    reason: UpgradeCompleted
    status: "True"
    type: Ready
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy2-common-nto-sub-policy
    namespace: default
  remediationPlan:
  - - spoke1
  status:
    remediationPlanForBatch:
      spoke1: -2 3

1
The value of spec.action.afterCompletion.deleteObjects field is true by default. After the update is completed, TALM deletes the underlying RHACM objects that were created during the update. This option is to prevent the RHACM hub from continuously checking for compliance after a successful update.
2
The status fields show that the updates completed successfully.
3
Displays that all the policies are applied to the cluster.
<discreet><title>The PrecachingRequired state</title>

In the PrecachingRequired state, the clusters need to have images pre-cached before the update can start. For more information about pre-caching, see the "Using the container image pre-cache feature" section.

</discreet>

18.5.6. Blocking ClusterGroupUpgrade CRs

You can create multiple ClusterGroupUpgrade CRs and control their order of application.

For example, if you create ClusterGroupUpgrade CR C that blocks the start of ClusterGroupUpgrade CR A, then ClusterGroupUpgrade CR A cannot start until the status of ClusterGroupUpgrade CR C becomes UpgradeComplete.

One ClusterGroupUpgrade CR can have multiple blocking CRs. In this case, all the blocking CRs must complete before the upgrade for the current CR can start.

Prerequisites

  • Install the Topology Aware Lifecycle Manager (TALM).
  • Provision one or more managed clusters.
  • Log in as a user with cluster-admin privileges.
  • Create RHACM policies in the hub cluster.

Procedure

  1. Save the content of the ClusterGroupUpgrade CRs in the cgu-a.yaml, cgu-b.yaml, and cgu-c.yaml files. 

    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-a
  namespace: default
spec:
  blockingCRs: 1
  - name: cgu-c
    namespace: default
  clusters:
  - spoke1
  - spoke2
  - spoke3
  enable: false
  managedPolicies:
  - policy1-common-cluster-version-policy
  - policy2-common-pao-sub-policy
  - policy3-common-ptp-sub-policy
  remediationStrategy:
    canaries:
    - spoke1
    maxConcurrency: 2
    timeout: 240
status:
  conditions:
  - message: The ClusterGroupUpgrade CR is not enabled
    reason: UpgradeNotStarted
    status: "False"
    type: Ready
  copiedPolicies:
  - cgu-a-policy1-common-cluster-version-policy
  - cgu-a-policy2-common-pao-sub-policy
  - cgu-a-policy3-common-ptp-sub-policy
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy2-common-pao-sub-policy
    namespace: default
  - name: policy3-common-ptp-sub-policy
    namespace: default
  placementBindings:
  - cgu-a-policy1-common-cluster-version-policy
  - cgu-a-policy2-common-pao-sub-policy
  - cgu-a-policy3-common-ptp-sub-policy
  placementRules:
  - cgu-a-policy1-common-cluster-version-policy
  - cgu-a-policy2-common-pao-sub-policy
  - cgu-a-policy3-common-ptp-sub-policy
  remediationPlan:
  - - spoke1
  - - spoke2
    1
    Defines the blocking CRs. The cgu-a update cannot start until cgu-c is complete. 
    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-b
  namespace: default
spec:
  blockingCRs: 1
  - name: cgu-a
    namespace: default
  clusters:
  - spoke4
  - spoke5
  enable: false
  managedPolicies:
  - policy1-common-cluster-version-policy
  - policy2-common-pao-sub-policy
  - policy3-common-ptp-sub-policy
  - policy4-common-sriov-sub-policy
  remediationStrategy:
    maxConcurrency: 1
    timeout: 240
status:
  conditions:
  - message: The ClusterGroupUpgrade CR is not enabled
    reason: UpgradeNotStarted
    status: "False"
    type: Ready
  copiedPolicies:
  - cgu-b-policy1-common-cluster-version-policy
  - cgu-b-policy2-common-pao-sub-policy
  - cgu-b-policy3-common-ptp-sub-policy
  - cgu-b-policy4-common-sriov-sub-policy
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy2-common-pao-sub-policy
    namespace: default
  - name: policy3-common-ptp-sub-policy
    namespace: default
  - name: policy4-common-sriov-sub-policy
    namespace: default
  placementBindings:
  - cgu-b-policy1-common-cluster-version-policy
  - cgu-b-policy2-common-pao-sub-policy
  - cgu-b-policy3-common-ptp-sub-policy
  - cgu-b-policy4-common-sriov-sub-policy
  placementRules:
  - cgu-b-policy1-common-cluster-version-policy
  - cgu-b-policy2-common-pao-sub-policy
  - cgu-b-policy3-common-ptp-sub-policy
  - cgu-b-policy4-common-sriov-sub-policy
  remediationPlan:
  - - spoke4
  - - spoke5
  status: {}
    1
    The cgu-b update cannot start until cgu-a is complete. 
    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-c
  namespace: default
spec: 1
  clusters:
  - spoke6
  enable: false
  managedPolicies:
  - policy1-common-cluster-version-policy
  - policy2-common-pao-sub-policy
  - policy3-common-ptp-sub-policy
  - policy4-common-sriov-sub-policy
  remediationStrategy:
    maxConcurrency: 1
    timeout: 240
status:
  conditions:
  - message: The ClusterGroupUpgrade CR is not enabled
    reason: UpgradeNotStarted
    status: "False"
    type: Ready
  copiedPolicies:
  - cgu-c-policy1-common-cluster-version-policy
  - cgu-c-policy4-common-sriov-sub-policy
  managedPoliciesCompliantBeforeUpgrade:
  - policy2-common-pao-sub-policy
  - policy3-common-ptp-sub-policy
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy4-common-sriov-sub-policy
    namespace: default
  placementBindings:
  - cgu-c-policy1-common-cluster-version-policy
  - cgu-c-policy4-common-sriov-sub-policy
  placementRules:
  - cgu-c-policy1-common-cluster-version-policy
  - cgu-c-policy4-common-sriov-sub-policy
  remediationPlan:
  - - spoke6
  status: {}
    1
    The cgu-c update does not have any blocking CRs. TALM starts the cgu-c update when the enable field is set to true.

  2. Create the ClusterGroupUpgrade CRs by running the following command for each relevant CR: 

    $ oc apply -f <name>.yaml

  3. Start the update process by running the following command for each relevant CR: 

    $ oc --namespace=default patch clustergroupupgrade.ran.openshift.io/<name> \
--type merge -p '{"spec":{"enable":true}}'

    The following examples show ClusterGroupUpgrade CRs where the enable field is set to true:

    Example for cgu-a with blocking CRs

    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-a
  namespace: default
spec:
  blockingCRs:
  - name: cgu-c
    namespace: default
  clusters:
  - spoke1
  - spoke2
  - spoke3
  enable: true
  managedPolicies:
  - policy1-common-cluster-version-policy
  - policy2-common-pao-sub-policy
  - policy3-common-ptp-sub-policy
  remediationStrategy:
    canaries:
    - spoke1
    maxConcurrency: 2
    timeout: 240
status:
  conditions:
  - message: 'The ClusterGroupUpgrade CR is blocked by other CRs that have not yet
      completed: [cgu-c]' 1
    reason: UpgradeCannotStart
    status: "False"
    type: Ready
  copiedPolicies:
  - cgu-a-policy1-common-cluster-version-policy
  - cgu-a-policy2-common-pao-sub-policy
  - cgu-a-policy3-common-ptp-sub-policy
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy2-common-pao-sub-policy
    namespace: default
  - name: policy3-common-ptp-sub-policy
    namespace: default
  placementBindings:
  - cgu-a-policy1-common-cluster-version-policy
  - cgu-a-policy2-common-pao-sub-policy
  - cgu-a-policy3-common-ptp-sub-policy
  placementRules:
  - cgu-a-policy1-common-cluster-version-policy
  - cgu-a-policy2-common-pao-sub-policy
  - cgu-a-policy3-common-ptp-sub-policy
  remediationPlan:
  - - spoke1
  - - spoke2
  status: {}

    1
    Shows the list of blocking CRs.

    Example for cgu-b with blocking CRs

    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-b
  namespace: default
spec:
  blockingCRs:
  - name: cgu-a
    namespace: default
  clusters:
  - spoke4
  - spoke5
  enable: true
  managedPolicies:
  - policy1-common-cluster-version-policy
  - policy2-common-pao-sub-policy
  - policy3-common-ptp-sub-policy
  - policy4-common-sriov-sub-policy
  remediationStrategy:
    maxConcurrency: 1
    timeout: 240
status:
  conditions:
  - message: 'The ClusterGroupUpgrade CR is blocked by other CRs that have not yet
      completed: [cgu-a]' 1
    reason: UpgradeCannotStart
    status: "False"
    type: Ready
  copiedPolicies:
  - cgu-b-policy1-common-cluster-version-policy
  - cgu-b-policy2-common-pao-sub-policy
  - cgu-b-policy3-common-ptp-sub-policy
  - cgu-b-policy4-common-sriov-sub-policy
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy2-common-pao-sub-policy
    namespace: default
  - name: policy3-common-ptp-sub-policy
    namespace: default
  - name: policy4-common-sriov-sub-policy
    namespace: default
  placementBindings:
  - cgu-b-policy1-common-cluster-version-policy
  - cgu-b-policy2-common-pao-sub-policy
  - cgu-b-policy3-common-ptp-sub-policy
  - cgu-b-policy4-common-sriov-sub-policy
  placementRules:
  - cgu-b-policy1-common-cluster-version-policy
  - cgu-b-policy2-common-pao-sub-policy
  - cgu-b-policy3-common-ptp-sub-policy
  - cgu-b-policy4-common-sriov-sub-policy
  remediationPlan:
  - - spoke4
  - - spoke5
  status: {}

    1
    Shows the list of blocking CRs.

    Example for cgu-c with blocking CRs

    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-c
  namespace: default
spec:
  clusters:
  - spoke6
  enable: true
  managedPolicies:
  - policy1-common-cluster-version-policy
  - policy2-common-pao-sub-policy
  - policy3-common-ptp-sub-policy
  - policy4-common-sriov-sub-policy
  remediationStrategy:
    maxConcurrency: 1
    timeout: 240
status:
  conditions:
  - message: The ClusterGroupUpgrade CR has upgrade policies that are still non compliant 1
    reason: UpgradeNotCompleted
    status: "False"
    type: Ready
  copiedPolicies:
  - cgu-c-policy1-common-cluster-version-policy
  - cgu-c-policy4-common-sriov-sub-policy
  managedPoliciesCompliantBeforeUpgrade:
  - policy2-common-pao-sub-policy
  - policy3-common-ptp-sub-policy
  managedPoliciesForUpgrade:
  - name: policy1-common-cluster-version-policy
    namespace: default
  - name: policy4-common-sriov-sub-policy
    namespace: default
  placementBindings:
  - cgu-c-policy1-common-cluster-version-policy
  - cgu-c-policy4-common-sriov-sub-policy
  placementRules:
  - cgu-c-policy1-common-cluster-version-policy
  - cgu-c-policy4-common-sriov-sub-policy
  remediationPlan:
  - - spoke6
  status:
    currentBatch: 1
    remediationPlanForBatch:
      spoke6: 0

    1
    The cgu-c update does not have any blocking CRs.

18.6. Update policies on managed clusters

The Topology Aware Lifecycle Manager (TALM) remediates a set of inform policies for the clusters specified in the ClusterGroupUpgrade CR. TALM remediates inform policies by making enforce copies of the managed RHACM policies. Each copied policy has its own corresponding RHACM placement rule and RHACM placement binding.

One by one, TALM adds each cluster from the current batch to the placement rule that corresponds with the applicable managed policy. If a cluster is already compliant with a policy, TALM skips applying that policy on the compliant cluster. TALM then moves on to applying the next policy to the non-compliant cluster. After TALM completes the updates in a batch, all clusters are removed from the placement rules associated with the copied policies. Then, the update of the next batch starts.

If a spoke cluster does not report any compliant state to RHACM, the managed policies on the hub cluster can be missing status information that TALM needs. TALM handles these cases in the following ways:

  • If a policy’s status.compliant field is missing, TALM ignores the policy and adds a log entry. Then, TALM continues looking at the policy’s status.status field.
  • If a policy’s status.status is missing, TALM produces an error.
  • If a cluster’s compliance status is missing in the policy’s status.status field, TALM considers that cluster to be non-compliant with that policy.

For more information about RHACM policies, see Policy overview.

Additional resources

For more information about the PolicyGenTemplate CRD, see About the PolicyGenTemplate CRD.

18.6.1. Applying update policies to managed clusters

You can update your managed clusters by applying your policies.

Prerequisites

  • Install the Topology Aware Lifecycle Manager (TALM).
  • Provision one or more managed clusters.
  • Log in as a user with cluster-admin privileges.
  • Create RHACM policies in the hub cluster.

Procedure

  1. Save the contents of the ClusterGroupUpgrade CR in the cgu-1.yaml file. 

    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: cgu-1
  namespace: default
spec:
  managedPolicies: 1
    - policy1-common-cluster-version-policy
    - policy2-common-nto-sub-policy
    - policy3-common-ptp-sub-policy
    - policy4-common-sriov-sub-policy
  enable: false
  clusters: 2
  - spoke1
  - spoke2
  - spoke5
  - spoke6
  remediationStrategy:
    maxConcurrency: 2 3
    timeout: 240 4
    1
    The name of the policies to apply.
    2
    The list of clusters to update.
    3
    The maxConcurrency field signifies the number of clusters updated at the same time.
    4
    The update timeout in minutes.

  2. Create the ClusterGroupUpgrade CR by running the following command: 

    $ oc create -f cgu-1.yaml

    1. Check if the ClusterGroupUpgrade CR was created in the hub cluster by running the following command: 

      $ oc get cgu --all-namespaces

      Example output

      NAMESPACE   NAME      AGE
default     cgu-1     8m55s

    2. Check the status of the update by running the following command: 

      $ oc get cgu -n default cgu-1 -ojsonpath='{.status}' | jq

      Example output

      {
  "computedMaxConcurrency": 2,
  "conditions": [
    {
      "lastTransitionTime": "2022-02-25T15:34:07Z",
      "message": "The ClusterGroupUpgrade CR is not enabled", 1
      "reason": "UpgradeNotStarted",
      "status": "False",
      "type": "Ready"
    }
  ],
  "copiedPolicies": [
    "cgu-policy1-common-cluster-version-policy",
    "cgu-policy2-common-nto-sub-policy",
    "cgu-policy3-common-ptp-sub-policy",
    "cgu-policy4-common-sriov-sub-policy"
  ],
  "managedPoliciesContent": {
    "policy1-common-cluster-version-policy": "null",
    "policy2-common-nto-sub-policy": "[{\"kind\":\"Subscription\",\"name\":\"node-tuning-operator\",\"namespace\":\"openshift-cluster-node-tuning-operator\"}]",
    "policy3-common-ptp-sub-policy": "[{\"kind\":\"Subscription\",\"name\":\"ptp-operator-subscription\",\"namespace\":\"openshift-ptp\"}]",
    "policy4-common-sriov-sub-policy": "[{\"kind\":\"Subscription\",\"name\":\"sriov-network-operator-subscription\",\"namespace\":\"openshift-sriov-network-operator\"}]"
  },
  "managedPoliciesForUpgrade": [
    {
      "name": "policy1-common-cluster-version-policy",
      "namespace": "default"
    },
    {
      "name": "policy2-common-nto-sub-policy",
      "namespace": "default"
    },
    {
      "name": "policy3-common-ptp-sub-policy",
      "namespace": "default"
    },
    {
      "name": "policy4-common-sriov-sub-policy",
      "namespace": "default"
    }
  ],
  "managedPoliciesNs": {
    "policy1-common-cluster-version-policy": "default",
    "policy2-common-nto-sub-policy": "default",
    "policy3-common-ptp-sub-policy": "default",
    "policy4-common-sriov-sub-policy": "default"
  },
  "placementBindings": [
    "cgu-policy1-common-cluster-version-policy",
    "cgu-policy2-common-nto-sub-policy",
    "cgu-policy3-common-ptp-sub-policy",
    "cgu-policy4-common-sriov-sub-policy"
  ],
  "placementRules": [
    "cgu-policy1-common-cluster-version-policy",
    "cgu-policy2-common-nto-sub-policy",
    "cgu-policy3-common-ptp-sub-policy",
    "cgu-policy4-common-sriov-sub-policy"
  ],
  "precaching": {
    "spec": {}
  },
  "remediationPlan": [
    [
      "spoke1",
      "spoke2"
    ],
    [
      "spoke5",
      "spoke6"
    ]
  ],
  "status": {}
}

      1
      The spec.enable field in the ClusterGroupUpgrade CR is set to false.

    3. Check the status of the policies by running the following command: 

      $ oc get policies -A

      Example output

      NAMESPACE   NAME                                                 REMEDIATION ACTION   COMPLIANCE STATE   AGE
default     cgu-policy1-common-cluster-version-policy            enforce                                 17m 1
default     cgu-policy2-common-nto-sub-policy                    enforce                                 17m
default     cgu-policy3-common-ptp-sub-policy                    enforce                                 17m
default     cgu-policy4-common-sriov-sub-policy                  enforce                                 17m
default     policy1-common-cluster-version-policy                inform               NonCompliant       15h
default     policy2-common-nto-sub-policy                        inform               NonCompliant       15h
default     policy3-common-ptp-sub-policy                        inform               NonCompliant       18m
default     policy4-common-sriov-sub-policy                      inform               NonCompliant       18m

      1
      The spec.remediationAction field of policies currently applied on the clusters is set to enforce. The managed policies in inform mode from the ClusterGroupUpgrade CR remain in inform mode during the update.

  3. Change the value of the spec.enable field to true by running the following command: 

    $ oc --namespace=default patch clustergroupupgrade.ran.openshift.io/cgu-1 \
--patch '{"spec":{"enable":true}}' --type=merge

Verification

  1. Check the status of the update again by running the following command: 

    $ oc get cgu -n default cgu-1 -ojsonpath='{.status}' | jq

    Example output

    {
  "computedMaxConcurrency": 2,
  "conditions": [ 1
    {
      "lastTransitionTime": "2022-02-25T15:34:07Z",
      "message": "The ClusterGroupUpgrade CR has upgrade policies that are still non compliant",
      "reason": "UpgradeNotCompleted",
      "status": "False",
      "type": "Ready"
    }
  ],
  "copiedPolicies": [
    "cgu-policy1-common-cluster-version-policy",
    "cgu-policy2-common-nto-sub-policy",
    "cgu-policy3-common-ptp-sub-policy",
    "cgu-policy4-common-sriov-sub-policy"
  ],
  "managedPoliciesContent": {
    "policy1-common-cluster-version-policy": "null",
    "policy2-common-nto-sub-policy": "[{\"kind\":\"Subscription\",\"name\":\"node-tuning-operator\",\"namespace\":\"openshift-cluster-node-tuning-operator\"}]",
    "policy3-common-ptp-sub-policy": "[{\"kind\":\"Subscription\",\"name\":\"ptp-operator-subscription\",\"namespace\":\"openshift-ptp\"}]",
    "policy4-common-sriov-sub-policy": "[{\"kind\":\"Subscription\",\"name\":\"sriov-network-operator-subscription\",\"namespace\":\"openshift-sriov-network-operator\"}]"
  },
  "managedPoliciesForUpgrade": [
    {
      "name": "policy1-common-cluster-version-policy",
      "namespace": "default"
    },
    {
      "name": "policy2-common-nto-sub-policy",
      "namespace": "default"
    },
    {
      "name": "policy3-common-ptp-sub-policy",
      "namespace": "default"
    },
    {
      "name": "policy4-common-sriov-sub-policy",
      "namespace": "default"
    }
  ],
  "managedPoliciesNs": {
    "policy1-common-cluster-version-policy": "default",
    "policy2-common-nto-sub-policy": "default",
    "policy3-common-ptp-sub-policy": "default",
    "policy4-common-sriov-sub-policy": "default"
  },
  "placementBindings": [
    "cgu-policy1-common-cluster-version-policy",
    "cgu-policy2-common-nto-sub-policy",
    "cgu-policy3-common-ptp-sub-policy",
    "cgu-policy4-common-sriov-sub-policy"
  ],
  "placementRules": [
    "cgu-policy1-common-cluster-version-policy",
    "cgu-policy2-common-nto-sub-policy",
    "cgu-policy3-common-ptp-sub-policy",
    "cgu-policy4-common-sriov-sub-policy"
  ],
  "precaching": {
    "spec": {}
  },
  "remediationPlan": [
    [
      "spoke1",
      "spoke2"
    ],
    [
      "spoke5",
      "spoke6"
    ]
  ],
  "status": {
    "currentBatch": 1,
    "currentBatchStartedAt": "2022-02-25T15:54:16Z",
    "remediationPlanForBatch": {
      "spoke1": 0,
      "spoke2": 1
    },
    "startedAt": "2022-02-25T15:54:16Z"
  }
}

    1
    Reflects the update progress of the current batch. Run this command again to receive updated information about the progress.

  2. If the policies include Operator subscriptions, you can check the installation progress directly on the single-node cluster.

    1. Export the KUBECONFIG file of the single-node cluster you want to check the installation progress for by running the following command: 

      $ export KUBECONFIG=<cluster_kubeconfig_absolute_path>

    2. Check all the subscriptions present on the single-node cluster and look for the one in the policy you are trying to install through the ClusterGroupUpgrade CR by running the following command: 

      $ oc get subs -A | grep -i <subscription_name>

      Example output for cluster-logging policy

      NAMESPACE                              NAME                         PACKAGE                      SOURCE             CHANNEL
openshift-logging                      cluster-logging              cluster-logging              redhat-operators   stable

  3. If one of the managed policies includes a ClusterVersion CR, check the status of platform updates in the current batch by running the following command against the spoke cluster: 

    $ oc get clusterversion

    Example output

    NAME      VERSION   AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.9.5     True        True          43s     Working towards 4.9.7: 71 of 735 done (9% complete)

  4. Check the Operator subscription by running the following command: 

    $ oc get subs -n <operator-namespace> <operator-subscription> -ojsonpath="{.status}"

  5. Check the install plans present on the single-node cluster that is associated with the desired subscription by running the following command: 

    $ oc get installplan -n <subscription_namespace>

    Example output for cluster-logging Operator

    NAMESPACE                              NAME            CSV                                 APPROVAL   APPROVED
openshift-logging                      install-6khtw   cluster-logging.5.3.3-4             Manual     true 1

    1
    The install plans have their Approval field set to Manual and their Approved field changes from false to true after TALM approves the install plan.
    Note

    When TALM is remediating a policy containing a subscription, it automatically approves any install plans attached to that subscription. Where multiple install plans are needed to get the operator to the latest known version, TALM might approve multiple install plans, upgrading through one or more intermediate versions to get to the final version.

  6. Check if the cluster service version for the Operator of the policy that the ClusterGroupUpgrade is installing reached the Succeeded phase by running the following command: 

    $ oc get csv -n <operator_namespace>

    Example output for OpenShift Logging Operator

    NAME                    DISPLAY                     VERSION   REPLACES   PHASE
cluster-logging.5.4.2   Red Hat OpenShift Logging   5.4.2                Succeeded

18.7. Creating a backup of cluster resources before upgrade

For single-node OpenShift, the Topology Aware Lifecycle Manager (TALM) can create a backup of a deployment before an upgrade. If the upgrade fails, you can recover the previous version and restore a cluster to a working state without requiring a reprovision of applications.

The container image backup starts when the backup field is set to true in the ClusterGroupUpgrade CR.

The backup process can be in the following statuses:

BackupStatePreparingToStart
The first reconciliation pass is in progress. The TALM deletes any spoke backup namespace and hub view resources that have been created in a failed upgrade attempt.
BackupStateStarting
The backup prerequisites and backup job are being created.
BackupStateActive
The backup is in progress.
BackupStateSucceeded
The backup has succeeded.
BackupStateTimeout
Artifact backup has been partially done.
BackupStateError
The backup has ended with a non-zero exit code.
Note

If the backup fails and enters the BackupStateTimeout or BackupStateError state, the cluster upgrade does not proceed.

18.7.1. Creating a ClusterGroupUpgrade CR with backup

For single-node OpenShift, you can create a backup of a deployment before an upgrade. If the upgrade fails you can use the upgrade-recovery.sh script generated by Topology Aware Lifecycle Manager (TALM) to return the system to its preupgrade state. The backup consists of the following items:

Cluster backup
A snapshot of etcd and static pod manifests.
Content backup
Backups of folders, for example, /etc, /usr/local, /var/lib/kubelet.
Changed files backup
Any files managed by machine-config that have been changed.
Deployment
A pinned ostree deployment.
Images (Optional)
Any container images that are in use.

Prerequisites

  • Install the Topology Aware Lifecycle Manager (TALM).
  • Provision one or more managed clusters.
  • Log in as a user with cluster-admin privileges.
  • Install Red Hat Advanced Cluster Management (RHACM).
Note

It is highly recommended that you create a recovery partition. The following is an example SiteConfig custom resource (CR) for a recovery partition of 50 GB: 

nodes:
    - hostName: "snonode.sno-worker-0.e2e.bos.redhat.com"
    role: "master"
    rootDeviceHints:
        hctl: "0:2:0:0"
        deviceName: /dev/sda
........
........
    #Disk /dev/sda: 893.3 GiB, 959119884288 bytes, 1873281024 sectors
    diskPartition:
        - device: /dev/sda
        partitions:
        - mount_point: /var/recovery
            size: 51200
            start: 800000

Procedure

  1. Save the contents of the ClusterGroupUpgrade CR with the backup field set to true in the clustergroupupgrades-group-du.yaml file: 

    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: du-upgrade-4918
  namespace: ztp-group-du-sno
spec:
  preCaching: true
  backup: true
  clusters:
  - cnfdb1
  - cnfdb2
  enable: false
  managedPolicies:
  - du-upgrade-platform-upgrade
  remediationStrategy:
    maxConcurrency: 2
    timeout: 240

  2. To start the update, apply the ClusterGroupUpgrade CR by running the following command: 

    $ oc apply -f clustergroupupgrades-group-du.yaml

Verification

  • Check the status of the upgrade in the hub cluster by running the following command: 

    $ oc get cgu -n ztp-group-du-sno du-upgrade-4918 -o jsonpath='{.status}'

    Example output

    {
    "backup": {
        "clusters": [
            "cnfdb2",
            "cnfdb1"
    ],
    "status": {
        "cnfdb1": "Succeeded",
        "cnfdb2": "Succeeded"
    }
},
"computedMaxConcurrency": 1,
"conditions": [
    {
        "lastTransitionTime": "2022-04-05T10:37:19Z",
        "message": "Backup is completed",
        "reason": "BackupCompleted",
        "status": "True",
        "type": "BackupDone"
    }
],
"precaching": {
    "spec": {}
},
"status": {}

18.7.2. Recovering a cluster after a failed upgrade

If an upgrade of a cluster fails, you can manually log in to the cluster and use the backup to return the cluster to its preupgrade state. There are two stages:

Rollback
If the attempted upgrade included a change to the platform OS deployment, you must roll back to the previous version before running the recovery script.
Important

A rollback is only applicable to upgrades from TALM and single-node OpenShift. This process does not apply to rollbacks from any other upgrade type.

Recovery
The recovery shuts down containers and uses files from the backup partition to relaunch containers and restore clusters.

Prerequisites

  • Install the Topology Aware Lifecycle Manager (TALM).
  • Provision one or more managed clusters.
  • Install Red Hat Advanced Cluster Management (RHACM).
  • Log in as a user with cluster-admin privileges.
  • Run an upgrade that is configured for backup.

Procedure

  1. Delete the previously created ClusterGroupUpgrade custom resource (CR) by running the following command: 

    $ oc delete cgu/du-upgrade-4918 -n ztp-group-du-sno
  2. Log in to the cluster that you want to recover.

  3. Check the status of the platform OS deployment by running the following command: 

    $ oc ostree admin status

    Example outputs

    [root@lab-test-spoke2-node-0 core]# ostree admin status
* rhcos c038a8f08458bbed83a77ece033ad3c55597e3f64edad66ea12fda18cbdceaf9.0
    Version: 49.84.202202230006-0
    Pinned: yes 1
    origin refspec: c038a8f08458bbed83a77ece033ad3c55597e3f64edad66ea12fda18cbdceaf9

    1
    The current deployment is pinned. A platform OS deployment rollback is not necessary. 
    [root@lab-test-spoke2-node-0 core]# ostree admin status
* rhcos f750ff26f2d5550930ccbe17af61af47daafc8018cd9944f2a3a6269af26b0fa.0
    Version: 410.84.202204050541-0
    origin refspec: f750ff26f2d5550930ccbe17af61af47daafc8018cd9944f2a3a6269af26b0fa
rhcos ad8f159f9dc4ea7e773fd9604c9a16be0fe9b266ae800ac8470f63abc39b52ca.0 (rollback) 1
    Version: 410.84.202203290245-0
    Pinned: yes 2
    origin refspec: ad8f159f9dc4ea7e773fd9604c9a16be0fe9b266ae800ac8470f63abc39b52ca
    1
    This platform OS deployment is marked for rollback.
    2
    The previous deployment is pinned and can be rolled back.

  4. To trigger a rollback of the platform OS deployment, run the following command: 

    $ rpm-ostree rollback -r

  5. The first phase of the recovery shuts down containers and restores files from the backup partition to the targeted directories. To begin the recovery, run the following command: 

    $ /var/recovery/upgrade-recovery.sh

  6. When prompted, reboot the cluster by running the following command: 

    $ systemctl reboot

  7. After the reboot, restart the recovery by running the following command: 

    $ /var/recovery/upgrade-recovery.sh  --resume
Note

If the recovery utility fails, you can retry with the --restart option: 

$ /var/recovery/upgrade-recovery.sh --restart

Verification

  • To check the status of the recovery run the following command: 

    $ oc get clusterversion,nodes,clusteroperator

    Example output

    NAME                                         VERSION   AVAILABLE   PROGRESSING   SINCE   STATUS
clusterversion.config.openshift.io/version   4.9.23    True        False         86d     Cluster version is 4.9.23 1


NAME                          STATUS   ROLES           AGE   VERSION
node/lab-test-spoke1-node-0   Ready    master,worker   86d   v1.22.3+b93fd35 2

NAME                                                                           VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE   MESSAGE
clusteroperator.config.openshift.io/authentication                             4.9.23    True        False         False      2d7h    3
clusteroperator.config.openshift.io/baremetal                                  4.9.23    True        False         False      86d


..............

    1
    The cluster version is available and has the correct version.
    2
    The node status is Ready.
    3
    The ClusterOperator object’s availability is True.

18.8. Using the container image pre-cache feature

Clusters might have limited bandwidth to access the container image registry, which can cause a timeout before the updates are completed.

Note

The time of the update is not set by TALM. You can apply the ClusterGroupUpgrade CR at the beginning of the update by manual application or by external automation.

The container image pre-caching starts when the preCaching field is set to true in the ClusterGroupUpgrade CR. After a successful pre-caching process, you can start remediating policies. The remediation actions start when the enable field is set to true.

The pre-caching process can be in the following statuses:

PrecacheNotStarted

This is the initial state all clusters are automatically assigned to on the first reconciliation pass of the ClusterGroupUpgrade CR.

In this state, TALM deletes any pre-caching namespace and hub view resources of spoke clusters that remain from previous incomplete updates. TALM then creates a new ManagedClusterView resource for the spoke pre-caching namespace to verify its deletion in the PrecachePreparing state.

PrecachePreparing
Cleaning up any remaining resources from previous incomplete updates is in progress.
PrecacheStarting
Pre-caching job prerequisites and the job are created.
PrecacheActive
The job is in "Active" state.
PrecacheSucceeded
The pre-cache job has succeeded.
PrecacheTimeout
The artifact pre-caching has been partially done.
PrecacheUnrecoverableError
The job ends with a non-zero exit code.

18.8.1. Creating a ClusterGroupUpgrade CR with pre-caching

The pre-cache feature allows the required container images to be present on the spoke cluster before the update starts.

Prerequisites

  • Install the Topology Aware Lifecycle Manager (TALM).
  • Provision one or more managed clusters.
  • Log in as a user with cluster-admin privileges.

Procedure

  1. Save the contents of the ClusterGroupUpgrade CR with the preCaching field set to true in the clustergroupupgrades-group-du.yaml file: 

    apiVersion: ran.openshift.io/v1alpha1
kind: ClusterGroupUpgrade
metadata:
  name: du-upgrade-4918
  namespace: ztp-group-du-sno
spec:
  preCaching: true 1
  clusters:
  - cnfdb1
  - cnfdb2
  enable: false
  managedPolicies:
  - du-upgrade-platform-upgrade
  remediationStrategy:
    maxConcurrency: 2
    timeout: 240
    1
    The preCaching field is set to true, which enables TALM to pull the container images before starting the update.

  2. When you want to start the update, apply the ClusterGroupUpgrade CR by running the following command: 

    $ oc apply -f clustergroupupgrades-group-du.yaml

Verification

  1. Check if the ClusterGroupUpgrade CR exists in the hub cluster by running the following command: 

    $ oc get cgu -A

    Example output

    NAMESPACE          NAME              AGE
ztp-group-du-sno   du-upgrade-4918   10s 1

    1
    The CR is created.

  2. Check the status of the pre-caching task by running the following command: 

    $ oc get cgu -n ztp-group-du-sno du-upgrade-4918 -o jsonpath='{.status}'

    Example output

    {
  "conditions": [
    {
      "lastTransitionTime": "2022-01-27T19:07:24Z",
      "message": "Precaching is not completed (required)", 1
      "reason": "PrecachingRequired",
      "status": "False",
      "type": "Ready"
    },
    {
      "lastTransitionTime": "2022-01-27T19:07:24Z",
      "message": "Precaching is required and not done",
      "reason": "PrecachingNotDone",
      "status": "False",
      "type": "PrecachingDone"
    },
    {
      "lastTransitionTime": "2022-01-27T19:07:34Z",
      "message": "Pre-caching spec is valid and consistent",
      "reason": "PrecacheSpecIsWellFormed",
      "status": "True",
      "type": "PrecacheSpecValid"
    }
  ],
  "precaching": {
    "clusters": [
      "cnfdb1" 2
    ],
    "spec": {
      "platformImage": "image.example.io"},
    "status": {
      "cnfdb1": "Active"}
    }
}

    1
    Displays that the update is in progress.
    2
    Displays the list of identified clusters.

  3. Check the status of the pre-caching job by running the following command on the spoke cluster: 

    $ oc get jobs,pods -n openshift-talm-pre-cache

    Example output

    NAME                  COMPLETIONS   DURATION   AGE
job.batch/pre-cache   0/1           3m10s      3m10s

NAME                     READY   STATUS    RESTARTS   AGE
pod/pre-cache--1-9bmlr   1/1     Running   0          3m10s

  4. Check the status of the ClusterGroupUpgrade CR by running the following command: 

    $ oc get cgu -n ztp-group-du-sno du-upgrade-4918 -o jsonpath='{.status}'

    Example output

    "conditions": [
    {
      "lastTransitionTime": "2022-01-27T19:30:41Z",
      "message": "The ClusterGroupUpgrade CR has all clusters compliant with all the managed policies",
      "reason": "UpgradeCompleted",
      "status": "True",
      "type": "Ready"
    },
    {
      "lastTransitionTime": "2022-01-27T19:28:57Z",
      "message": "Precaching is completed",
      "reason": "PrecachingCompleted",
      "status": "True",
      "type": "PrecachingDone" 1
    }

    1
    The pre-cache tasks are done.

18.9. Troubleshooting the Topology Aware Lifecycle Manager

The Topology Aware Lifecycle Manager (TALM) is an OpenShift Container Platform Operator that remediates RHACM policies. When issues occur, use the oc adm must-gather command to gather details and logs and to take steps in debugging the issues.

For more information about related topics, see the following documentation:

18.9.1. General troubleshooting

You can determine the cause of the problem by reviewing the following questions:

To ensure that the ClusterGroupUpgrade configuration is functional, you can do the following:

  1. Create the ClusterGroupUpgrade CR with the spec.enable field set to false.
  2. Wait for the status to be updated and go through the troubleshooting questions.
  3. If everything looks as expected, set the spec.enable field to true in the ClusterGroupUpgrade CR.
Warning

After you set the spec.enable field to true in the ClusterUpgradeGroup CR, the update procedure starts and you cannot edit the CR’s spec fields anymore.

18.9.2. Cannot modify the ClusterUpgradeGroup CR

Issue
You cannot edit the ClusterUpgradeGroup CR after enabling the update.
Resolution

Restart the procedure by performing the following steps:

  1. Remove the old ClusterGroupUpgrade CR by running the following command: 

    $ oc delete cgu -n <ClusterGroupUpgradeCR_namespace> <ClusterGroupUpgradeCR_name>

  2. Check and fix the existing issues with the managed clusters and policies.

    1. Ensure that all the clusters are managed clusters and available.
    2. Ensure that all the policies exist and have the spec.remediationAction field set to inform.

  3. Create a new ClusterGroupUpgrade CR with the correct configurations. 

    $ oc apply -f <ClusterGroupUpgradeCR_YAML>

18.9.3. Managed policies

Checking managed policies on the system

Issue
You want to check if you have the correct managed policies on the system.
Resolution

Run the following command: 

$ oc get cgu lab-upgrade -ojsonpath='{.spec.managedPolicies}'

Example output

["group-du-sno-validator-du-validator-policy", "policy2-common-nto-sub-policy", "policy3-common-ptp-sub-policy"]

Checking remediationAction mode

Issue
You want to check if the remediationAction field is set to inform in the spec of the managed policies.
Resolution

Run the following command: 

$ oc get policies --all-namespaces

Example output

NAMESPACE   NAME                                                 REMEDIATION ACTION   COMPLIANCE STATE   AGE
default     policy1-common-cluster-version-policy                inform               NonCompliant       5d21h
default     policy2-common-nto-sub-policy                        inform               Compliant          5d21h
default     policy3-common-ptp-sub-policy                        inform               NonCompliant       5d21h
default     policy4-common-sriov-sub-policy                      inform               NonCompliant       5d21h

Checking policy compliance state

Issue
You want to check the compliance state of policies.
Resolution

Run the following command: 

$ oc get policies --all-namespaces

Example output

NAMESPACE   NAME                                                 REMEDIATION ACTION   COMPLIANCE STATE   AGE
default     policy1-common-cluster-version-policy                inform               NonCompliant       5d21h
default     policy2-common-nto-sub-policy                        inform               Compliant          5d21h
default     policy3-common-ptp-sub-policy                        inform               NonCompliant       5d21h
default     policy4-common-sriov-sub-policy                      inform               NonCompliant       5d21h

18.9.4. Clusters

Checking if managed clusters are present
Issue
You want to check if the clusters in the ClusterGroupUpgrade CR are managed clusters.
Resolution

Run the following command: 

$ oc get managedclusters

Example output

NAME            HUB ACCEPTED   MANAGED CLUSTER URLS                    JOINED   AVAILABLE   AGE
local-cluster   true           https://api.hub.example.com:6443        True     Unknown     13d
spoke1          true           https://api.spoke1.example.com:6443     True     True        13d
spoke3          true           https://api.spoke3.example.com:6443     True     True        27h

  1. Alternatively, check the TALM manager logs:

    1. Get the name of the TALM manager by running the following command: 

      $ oc get pod -n openshift-operators

      Example output

      NAME                                                         READY   STATUS    RESTARTS   AGE
cluster-group-upgrades-controller-manager-75bcc7484d-8k8xp   2/2     Running   0          45m

    2. Check the TALM manager logs by running the following command: 

      $ oc logs -n openshift-operators \
cluster-group-upgrades-controller-manager-75bcc7484d-8k8xp -c manager

      Example output

      ERROR	controller-runtime.manager.controller.clustergroupupgrade	Reconciler error	{"reconciler group": "ran.openshift.io", "reconciler kind": "ClusterGroupUpgrade", "name": "lab-upgrade", "namespace": "default", "error": "Cluster spoke5555 is not a ManagedCluster"} 1
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem

      1
      The error message shows that the cluster is not a managed cluster.
Checking if managed clusters are available
Issue
You want to check if the managed clusters specified in the ClusterGroupUpgrade CR are available.
Resolution

Run the following command: 

$ oc get managedclusters

Example output

NAME            HUB ACCEPTED   MANAGED CLUSTER URLS                    JOINED   AVAILABLE   AGE
local-cluster   true           https://api.hub.testlab.com:6443        True     Unknown     13d
spoke1          true           https://api.spoke1.testlab.com:6443     True     True        13d 1
spoke3          true           https://api.spoke3.testlab.com:6443     True     True        27h 2

1 2
The value of the AVAILABLE field is True for the managed clusters.
Checking clusterSelector
Issue
You want to check if the clusterSelector field is specified in the ClusterGroupUpgrade CR in at least one of the managed clusters.
Resolution

Run the following command: 

$ oc get managedcluster --selector=upgrade=true 1
1
The label for the clusters you want to update is upgrade:true.

Example output

NAME            HUB ACCEPTED   MANAGED CLUSTER URLS                     JOINED    AVAILABLE   AGE
spoke1          true           https://api.spoke1.testlab.com:6443      True     True        13d
spoke3          true           https://api.spoke3.testlab.com:6443      True     True        27h

Checking if canary clusters are present
Issue

You want to check if the canary clusters are present in the list of clusters.

Example ClusterGroupUpgrade CR

spec:
    clusters:
    - spoke1
    - spoke3
    clusterSelector:
    - upgrade2=true
    remediationStrategy:
        canaries:
        - spoke3
        maxConcurrency: 2
        timeout: 240

Resolution

Run the following commands: 

$ oc get cgu lab-upgrade -ojsonpath='{.spec.clusters}'

Example output

["spoke1", "spoke3"]

  1. Check if the canary clusters are present in the list of clusters that match clusterSelector labels by running the following command: 

    $ oc get managedcluster --selector=upgrade=true

    Example output

    NAME            HUB ACCEPTED   MANAGED CLUSTER URLS   JOINED    AVAILABLE   AGE
spoke1          true           https://api.spoke1.testlab.com:6443   True     True        13d
spoke3          true           https://api.spoke3.testlab.com:6443   True     True        27h

Note

A cluster can be present in spec.clusters and also be matched by the spec.clusterSelecter label.

Checking the pre-caching status on spoke clusters

  1. Check the status of pre-caching by running the following command on the spoke cluster: 

    $ oc get jobs,pods -n openshift-talo-pre-cache

18.9.5. Remediation Strategy

Checking if remediationStrategy is present in the ClusterGroupUpgrade CR
Issue
You want to check if the remediationStrategy is present in the ClusterGroupUpgrade CR.
Resolution

Run the following command: 

$ oc get cgu lab-upgrade -ojsonpath='{.spec.remediationStrategy}'

Example output

{"maxConcurrency":2, "timeout":240}

Checking if maxConcurrency is specified in the ClusterGroupUpgrade CR
Issue
You want to check if the maxConcurrency is specified in the ClusterGroupUpgrade CR.
Resolution

Run the following command: 

$ oc get cgu lab-upgrade -ojsonpath='{.spec.remediationStrategy.maxConcurrency}'

Example output

2

18.9.6. Topology Aware Lifecycle Manager

Checking condition message and status in the ClusterGroupUpgrade CR
Issue
You want to check the value of the status.conditions field in the ClusterGroupUpgrade CR.
Resolution

Run the following command: 

$ oc get cgu lab-upgrade -ojsonpath='{.status.conditions}'

Example output

{"lastTransitionTime":"2022-02-17T22:25:28Z", "message":"The ClusterGroupUpgrade CR has managed policies that are missing:[policyThatDoesntExist]", "reason":"UpgradeCannotStart", "status":"False", "type":"Ready"}

Checking corresponding copied policies
Issue
You want to check if every policy from status.managedPoliciesForUpgrade has a corresponding policy in status.copiedPolicies.
Resolution

Run the following command: 

$ oc get cgu lab-upgrade -oyaml

Example output

status:
  …
  copiedPolicies:
  - lab-upgrade-policy3-common-ptp-sub-policy
  managedPoliciesForUpgrade:
  - name: policy3-common-ptp-sub-policy
    namespace: default

Checking if status.remediationPlan was computed
Issue
You want to check if status.remediationPlan is computed.
Resolution

Run the following command: 

$ oc get cgu lab-upgrade -ojsonpath='{.status.remediationPlan}'

Example output

[["spoke2", "spoke3"]]

Errors in the TALM manager container
Issue
You want to check the logs of the manager container of TALM.
Resolution

Run the following command: 

$ oc logs -n openshift-operators \
cluster-group-upgrades-controller-manager-75bcc7484d-8k8xp -c manager

Example output

ERROR	controller-runtime.manager.controller.clustergroupupgrade	Reconciler error	{"reconciler group": "ran.openshift.io", "reconciler kind": "ClusterGroupUpgrade", "name": "lab-upgrade", "namespace": "default", "error": "Cluster spoke5555 is not a ManagedCluster"} 1
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem

1
Displays the error.

Additional resources

Red Hat logoGithubRedditYoutubeTwitter

Learn

Try, buy, & sell

Communities

About Red Hat Documentation

We help Red Hat users innovate and achieve their goals with our products and services with content they can trust.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. For more details, see the Red Hat Blog.

About Red Hat

We deliver hardened solutions that make it easier for enterprises to work across platforms and environments, from the core datacenter to the network edge.

© 2024 Red Hat, Inc.