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TELCODOCS-1209: Enable precaching of user specified images with TALM
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‎modules/cnf-topology-aware-lifecycle-manager-creating-custom-resources.adoc

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// Module included in the following assemblies:
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//
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// * scalability_and_performance/ztp_far_edge/ztp-talm-updating-managed-policies.adoc
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:_content-type: PROCEDURE
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[id="talm-prechache-user-specified-images-preparing-crs_{context}"]
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== Creating the custom resources for pre-caching
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You must create the `PreCachingConfig` CR before or concurrently with the `ClusterGroupUpgrade` CR.
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. Create the `PreCachingConfig` CR with the list of additional images you want to pre-cache.
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[source,yaml]
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----
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apiVersion: ran.openshift.io/v1alpha1
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kind: PreCachingConfig
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metadata:
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name: exampleconfig
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namespace: default <1>
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spec:
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[...]
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spaceRequired: 30Gi <2>
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additionalImages:
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- quay.io/exampleconfig/application1@sha256:3d5800990dee7cd4727d3fe238a97e2d2976d3808fc925ada29c559a47e2e1ef
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- quay.io/exampleconfig/application2@sha256:3d5800123dee7cd4727d3fe238a97e2d2976d3808fc925ada29c559a47adfaef
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- quay.io/exampleconfig/applicationN@sha256:4fe1334adfafadsf987123adfffdaf1243340adfafdedga0991234afdadfsa09
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----
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<1> The `namespace` must be accessible to the hub cluster.
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<2> It is recommended to set the minimum disk space required field to ensure that there is sufficient storage space for the pre-cached images.
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. Create a `ClusterGroupUpgrade` CR with the `preCaching` field set to `true` and specify the `PreCachingConfig` CR created in the previous step:
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[source,yaml]
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----
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apiVersion: ran.openshift.io/v1alpha1
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kind: ClusterGroupUpgrade
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metadata:
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name: cgu
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namespace: default
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spec:
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clusters:
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- sno1
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- sno2
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preCaching: true
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preCachingConfigRef:
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- name: exampleconfig
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namespace: default
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managedPolicies:
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- du-upgrade-platform-upgrade
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- du-upgrade-operator-catsrc-policy
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- common-subscriptions-policy
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remediationStrategy:
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timeout: 240
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----
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+
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[WARNING]
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====
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Once you install the images on the cluster, you cannot change or delete them.
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====
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. When you want to start pre-caching the images, apply the `ClusterGroupUpgrade` CR by running the following command:
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[source,terminal]
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----
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$ oc apply -f cgu.yaml
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----
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{cgu-operator} verifies the `ClusterGroupUpgrade` CR.
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From this point, you can continue with the {cgu-operator} pre-caching workflow.
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[NOTE]
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====
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All sites are pre-cached concurrently.
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====
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.Verification
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. Check the pre-caching status on the hub cluster where the `ClusterUpgradeGroup` CR is applied by running the following command:
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[source,terminal]
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----
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$ oc get cgu <cgu_name> -n <cgu_namespace> -oyaml
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----
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+
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.Example output
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[source,yaml]
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----
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precaching:
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spec:
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platformImage: quay.io/openshift-release-dev/ocp-release@sha256:3d5800990dee7cd4727d3fe238a97e2d2976d3808fc925ada29c559a47e2e1ef
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operatorsIndexes:
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- registry.example.com:5000/custom-redhat-operators:1.0.0
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operatorsPackagesAndChannels:
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- local-storage-operator: stable
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- ptp-operator: stable
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- sriov-network-operator: stable
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excludePrecachePatterns:
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- aws
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- vsphere
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additionalImages:
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- quay.io/exampleconfig/application1@sha256:3d5800990dee7cd4727d3fe238a97e2d2976d3808fc925ada29c559a47e2e1ef
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- quay.io/exampleconfig/application2@sha256:3d5800123dee7cd4727d3fe238a97e2d2976d3808fc925ada29c559a47adfaef
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- quay.io/exampleconfig/applicationN@sha256:4fe1334adfafadsf987123adfffdaf1243340adfafdedga0991234afdadfsa09
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spaceRequired: "30"
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status:
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sno1: Starting
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sno2: Starting
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----
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The pre-caching configurations are validated by checking if the managed policies exist.
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Valid configurations of the `ClusterGroupUpgrade` and the `PreCachingConfig` CRs result in the following statuses:
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+
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.Example output of valid CRs
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[source,yaml]
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----
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- lastTransitionTime: "2023-01-01T00:00:01Z"
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message: All selected clusters are valid
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reason: ClusterSelectionCompleted
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status: "True"
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type: ClusterSelected
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- lastTransitionTime: "2023-01-01T00:00:02Z"
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message: Completed validation
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reason: ValidationCompleted
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status: "True"
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type: Validated
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- lastTransitionTime: "2023-01-01T00:00:03Z"
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message: Precaching spec is valid and consistent
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reason: PrecacheSpecIsWellFormed
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status: "True"
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type: PrecacheSpecValid
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- lastTransitionTime: "2023-01-01T00:00:04Z"
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message: Precaching in progress for 1 clusters
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reason: InProgress
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status: "False"
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type: PrecachingSucceeded
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----
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+
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.Example of an invalid PreCachingConfig CR
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[source,yaml]
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----
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Type: "PrecacheSpecValid"
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Status: False,
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Reason: "PrecacheSpecIncomplete"
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Message: "Precaching spec is incomplete: failed to get PreCachingConfig resource due to PreCachingConfig.ran.openshift.io "<pre-caching_cr_name>" not found"
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----
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. You can find the pre-caching job by running the following command on the managed cluster:
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[source,terminal]
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----
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$ oc get jobs -n openshift-talo-pre-cache
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----
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.Example of pre-caching job in progress
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[source,terminal]
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----
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NAME COMPLETIONS DURATION AGE
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pre-cache 0/1 1s 1s
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----
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. You can check the status of the pod created for the pre-caching job by running the following command:
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[source,terminal]
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----
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$ oc describe pod pre-cache -n openshift-talo-pre-cache
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----
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.Example of pre-caching job in progress
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[source,terminal]
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----
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Type Reason Age From Message
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Normal SuccesfulCreate 19s job-controller Created pod: pre-cache-abcd1
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----
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. You can get live updates on the status of the job by running the following command:
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[source,terminal]
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----
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$ oc logs -f pre-cache-abcd1 -n openshift-talo-pre-cache
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----
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. To verify the pre-cache job is successfully completed, run the following command:
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[source,terminal]
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----
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$ oc describe pod pre-cache -n openshift-talo-pre-cache
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----
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.Example of completed pre-cache job
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[source,terminal]
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----
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Type Reason Age From Message
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Normal SuccesfulCreate 5m19s job-controller Created pod: pre-cache-abcd1
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Normal Completed 19s job-controller Job completed
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----
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. To verify that the images are successfully pre-cached on the {sno}, do the following:
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.. Enter into the node in debug mode:
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[source,terminal]
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----
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$ oc debug node/cnfdf00.example.lab
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----
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.. Change root to `host`:
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[source,terminal]
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----
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$ chroot /host/
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----
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.. Search for the desired images:
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[source,terminal]
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----
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$ sudo podman images | grep <operator_name>
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----

‎modules/cnf-topology-aware-lifecycle-manager-precache-user-spec-images.adoc

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// Module included in the following assemblies:
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//
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// * scalability_and_performance/ztp_far_edge/ztp-talm-updating-managed-policies.adoc
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:_content-type: CONCEPT
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[id="talm-prechache-user-specified-images-concept_{context}"]
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= Pre-caching user-specified images with {cgu-operator} on {sno} clusters
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You can pre-cache application-specific workload images on {sno} clusters before upgrading your applications.
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You can specify the configuration options for the pre-caching jobs using the following custom resources (CR):
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* `PreCachingConfig` CR
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* `ClusterGroupUpgrade` CR
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[NOTE]
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====
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All fields in the `PreCachingConfig` CR are optional.
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====
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.Example PreCachingConfig CR
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[source,yaml]
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----
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apiVersion: ran.openshift.io/v1alpha1
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kind: PreCachingConfig
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metadata:
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name: exampleconfig
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namespace: exampleconfig-ns
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spec:
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overrides: <1>
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platformImage: quay.io/openshift-release-dev/ocp-release@sha256:3d5800990dee7cd4727d3fe238a97e2d2976d3808fc925ada29c559a47e2e1ef
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operatorsIndexes:
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- registry.example.com:5000/custom-redhat-operators:1.0.0
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operatorsPackagesAndChannels:
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- local-storage-operator: stable
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- ptp-operator: stable
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- sriov-network-operator: stable
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spaceRequired: 30 Gi <2>
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excludePrecachePatterns: <3>
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- aws
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- vsphere
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additionalImages: <4>
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- quay.io/exampleconfig/application1@sha256:3d5800990dee7cd4727d3fe238a97e2d2976d3808fc925ada29c559a47e2e1ef
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- quay.io/exampleconfig/application2@sha256:3d5800123dee7cd4727d3fe238a97e2d2976d3808fc925ada29c559a47adfaef
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- quay.io/exampleconfig/applicationN@sha256:4fe1334adfafadsf987123adfffdaf1243340adfafdedga0991234afdadfsa09
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----
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<1> By default, {cgu-operator} automatically populates the `platformImage`, `operatorsIndexes`, and the `operatorsPackagesAndChannels` fields from the policies of the managed clusters. You can specify values to override the default {cgu-operator}-derived values for these fields.
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<2> Specifies the minimum required disk space on the cluster. If unspecified, {cgu-operator} defines a default value for {product-title} images. The disk space field must include an integer value and the storage unit. For example: `40 GiB`, `200 MB`, `1 TiB`.
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<3> Specifies the images to exclude from pre-caching based on image name matching.
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<4> Specifies the list of additional images to pre-cache.
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.Example ClusterGroupUpgrade CR with PreCachingConfig CR reference
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[source,yaml]
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----
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apiVersion: ran.openshift.io/v1alpha1
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kind: ClusterGroupUpgrade
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metadata:
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name: cgu
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spec:
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preCaching: true <1>
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preCachingConfigRef:
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name: exampleconfig <2>
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namespace: exampleconfig-ns <3>
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----
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<1> The `preCaching` field set to `true` enables the pre-caching job.
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<2> The `preCachingConfigRef.name` field specifies the `PreCachingConfig` CR that you want to use.
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<3> The `preCachingConfigRef.namespace` specifies the namespace of the `PreCachingConfig` CR that you want to use.

‎scalability_and_performance/ztp_far_edge/ztp-talm-updating-managed-policies.adoc

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include::modules/cnf-topology-aware-lifecycle-manager-pao-update.adoc[leveloffset=+2]
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include::modules/cnf-topology-aware-lifecycle-manager-precache-user-spec-images.adoc[leveloffset=+2]
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include::modules/cnf-topology-aware-lifecycle-manager-creating-custom-resources.adoc[leveloffset=+2]
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[role="_additional-resources"]
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.Additional resources
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* For more information about the {cgu-operator} pre-caching workflow, see xref:../../scalability_and_performance/cnf-talm-for-cluster-upgrades.adoc#talo-precache-feature-concept_cnf-topology-aware-lifecycle-manager[Using the container image pre-cache feature].
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include::modules/cnf-topology-aware-lifecycle-manager-autocreate-cgu-cr-ztp.adoc[leveloffset=+1]

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