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Customize_iPXE_Binary_Names.md

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Customize iPXE Binary Names

The default behavior for the cray-ipxe service is to build iPXE binaries with a well known name. However, to help prevent untrusted access to the iPXE binaries, sites may manually customize the iPXE binary names to a site-specific value. The site may further change the iPXE binary names periodically to further obfuscate and prevent access.

Prerequisites

This procedure requires administrative privileges.

Procedure

  1. Edit the cray-ipxe-settings ConfigMap using one of the following options.

    NOTE Save a backup of the ConfigMap before making any changes.

    The following is an example of creating a backup:

    kubectl get configmap -n services cray-ipxe-settings \
        -o yaml > /root/cray-ipxe-settings-backup.yaml

  2. Within the ConfigMap, edit the following keys to set the desired iPXE binary names.

    iPXE Binary ConfigMap Key Name Default Value
    Regular iPXE cray_ipxe_binary_name ipxe.efi
    Debug iPXE cray_ipxe_debug_binary_name debug-ipxe.efi

    NOTE Do not change the cray_ipxe_binary_name_active or cray_ipxe_debug_binary_name_active keys in the cray-ipxe-settings ConfigMap. The cray-ipxe builder will automatically update these keys with the name of the currently built iPXE images once they are available.

    • Option 1: Edit the cray-ipxe-settings ConfigMap directly.

      kubectl edit configmap -n services cray-ipxe-settings

    • Option 2: Edit the ConfigMap by saving the file, editing it, and reloading the ConfigMap.

      1. Save the file.

        kubectl get configmap -n services cray-ipxe-settings \
        -o yaml > /root/cray-ipxe-settings.yaml

      2. Edit the cray-ipxe-settings.yaml file.

        vi /root/cray-ipxe-bss-ipxe.yaml

      3. Reload the ConfigMap.

        Deleting and recreating the ConfigMap will reload it.

        kubectl delete configmap -n services cray-ipxe-settings
kubectl create -f /root/cray-ipxe-settings.yaml

The cray-ipxe builder will detect the configuration change and rebuild the iPXE binaries within 30 to 90 seconds. Upon successfully building the newly named binaries, the cray-ipxe builder will delete the old binaries from the shared file system.