Chapter 4. Configuring multi-architecture compute machines on an OpenShift Container Platform cluster

Procedure

1. Log in to your Azure account:

   $ az login

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2. Create a storage account and upload the ARM64 virtual hard disk (VHD) to your storage account. The OpenShift Container Platform installation program creates a resource group, however, the boot image can also be uploaded to a custom named resource group:

   $ az storage account create -n ${STORAGE_ACCOUNT_NAME} -g ${RESOURCE_GROUP} -l westus --sku Standard_LRS 

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   The westus object is an example region.

3. Create a storage container using the storage account you generated:

   $ az storage container create -n ${CONTAINER_NAME} --account-name ${STORAGE_ACCOUNT_NAME}

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4. You must use the OpenShift Container Platform installation program JSON file to extract the URL and aarch64 VHD name:

   1. Extract the URL field and set it to RHCOS_VHD_ORIGIN_URL as the file name by running the following command:

      $ RHCOS_VHD_ORIGIN_URL=$(oc -n openshift-machine-config-operator get configmap/coreos-bootimages -o jsonpath='{.data.stream}' | jq -r '.architectures.aarch64."rhel-coreos-extensions"."azure-disk".url')

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   2. Extract the aarch64 VHD name and set it to BLOB_NAME as the file name by running the following command:

      $ BLOB_NAME=rhcos-$(oc -n openshift-machine-config-operator get configmap/coreos-bootimages -o jsonpath='{.data.stream}' | jq -r '.architectures.aarch64."rhel-coreos-extensions"."azure-disk".release')-azure.aarch64.vhd

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5. Generate a shared access signature (SAS) token. Use this token to upload the RHCOS VHD to your storage container with the following commands:

   $ end=`date -u -d "30 minutes" '+%Y-%m-%dT%H:%MZ'`

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   $ sas=`az storage container generate-sas -n ${CONTAINER_NAME} --account-name ${STORAGE_ACCOUNT_NAME} --https-only --permissions dlrw --expiry $end -o tsv`

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6. Copy the RHCOS VHD into the storage container:

   $ az storage blob copy start --account-name ${STORAGE_ACCOUNT_NAME} --sas-token "$sas" \
    --source-uri "${RHCOS_VHD_ORIGIN_URL}" \
    --destination-blob "${BLOB_NAME}" --destination-container ${CONTAINER_NAME}

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   You can check the status of the copying process with the following command:

   $ az storage blob show -c ${CONTAINER_NAME} -n ${BLOB_NAME} --account-name ${STORAGE_ACCOUNT_NAME} | jq .properties.copy

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   Example output

   {
    "completionTime": null,
    "destinationSnapshot": null,
    "id": "1fd97630-03ca-489a-8c4e-cfe839c9627d",
    "incrementalCopy": null,
    "progress": "17179869696/17179869696",
    "source": "https://rhcos.blob.core.windows.net/imagebucket/rhcos-411.86.202207130959-0-azure.aarch64.vhd",
    "status": "success", 

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    "statusDescription": null
   }

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   If the status parameter displays the success object, the copying process is complete.

7. Create an image gallery using the following command:

   $ az sig create --resource-group ${RESOURCE_GROUP} --gallery-name ${GALLERY_NAME}

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   Use the image gallery to create an image definition. In the following example command, rhcos-arm64 is the name of the image definition.

   $ az sig image-definition create --resource-group ${RESOURCE_GROUP} --gallery-name ${GALLERY_NAME} --gallery-image-definition rhcos-arm64 --publisher RedHat --offer arm --sku arm64 --os-type linux --architecture Arm64 --hyper-v-generation V2

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8. To get the URL of the VHD and set it to RHCOS_VHD_URL as the file name, run the following command:

   $ RHCOS_VHD_URL=$(az storage blob url --account-name ${STORAGE_ACCOUNT_NAME} -c ${CONTAINER_NAME} -n "${BLOB_NAME}" -o tsv)

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9. Use the RHCOS_VHD_URL file, your storage account, resource group, and image gallery to create an image version. In the following example, 1.0.0 is the image version.

   $ az sig image-version create --resource-group ${RESOURCE_GROUP} --gallery-name ${GALLERY_NAME} --gallery-image-definition rhcos-arm64 --gallery-image-version 1.0.0 --os-vhd-storage-account ${STORAGE_ACCOUNT_NAME} --os-vhd-uri ${RHCOS_VHD_URL}

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10. Your ARM64 boot image is now generated. You can access the ID of your image with the following command:

    $ az sig image-version show -r $GALLERY_NAME -g $RESOURCE_GROUP -i rhcos-arm64 -e 1.0.0

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    The following example image ID is used in the recourseID parameter of the compute machine set:

    Example resourceID

    /resourceGroups/${RESOURCE_GROUP}/providers/Microsoft.Compute/galleries/${GALLERY_NAME}/images/rhcos-arm64/versions/1.0.0

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Verification

1. Verify that the new ARM64 machines are running by entering the following command:

   $ oc get machineset -n openshift-machine-api

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   Example output

   NAME                                                DESIRED  CURRENT  READY  AVAILABLE  AGE
   <infrastructure_id>-arm64-machine-set-0                   2        2      2          2  10m

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2. You can check that the nodes are ready and scheduable with the following command:

   $ oc get nodes

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