Tuned Fails to Apply Kernel Parameters Due to Missing grub.cfg in OpenShift.

Solution Verified - Updated -

Issue

  • When applying a custom Tuned performance profile in an OpenShift cluster, the expected kernel boot parameters (such as isolcpus, intel_pstate, etc.) are not applied.
  • Logs from theJournalctl logs of node show:
tuned.plugins.plugin_bootloader: installing additional boot command line parameters to grub2
tuned.plugins.plugin_bootloader: cannot find grub.cfg to patch

Environment

  • Red Hat OpenShift Container Platform 4.x
  • Red Hat CoreOS (RHCOS)
  • Tuned Operator with a custom performance profile

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