pre-overcloud-prepare

compute-tsx

RHEL8.x kernel flag for Compute nodes validation.

RHEL-8.3 kernel disabled the Intel TSX (Transactional Synchronization Extensions) feature by default as a preemptive security measure, but it breaks live migration from RHEL-7.9 (or even RHEL-8.1 or RHEL-8.2) to RHEL-8.3.

Operators are expected to explicitly define the TSX flag in their KernelArgs for the compute role to prevent live-migration issues during the upgrade process.

This also impacts upstream CentOS systems.

• hosts: nova_libvirt

• groups: pre-upgrade, pre-system-upgrade, pre-overcloud-prepare, pre-overcloud-upgrade, pre-overcloud-converge, pre-update, pre-update-prepare, pre-update-run, pre-update-converge

• parameters:

  • compute_tsx_debug: False

  • compute_tsx_warning: False

• roles: compute_tsx

Role documentation

• compute_tsx
  • Role Documentation
    • Role Defaults
    • Role Variables: main.yml
    • Molecule Scenarios
      • Scenario: default
        • Example default configuration
        • Molecule Inventory
        • Example default playbook