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Compute-TSX

An Ansible role to verify that the compute nodes have the appropriate TSX flags before proceeding with an upgrade.

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 role is intended to be called by tripleo via the kernel deployment templates.

It's also possible to call the role as a standalone.

This also impacts upstream CentOS systems

Requirements

This role needs to be run on an Undercloud with a deployed Overcloud.

Role Variables

compute_tsx_debug: <'false'> -- Whether or not to print the computed variables during execution
compute_tsx_warning: <'false'> -- Will not return a failure, but will simply print the failure
compute_tsx_kernel_args: <''> -- This is meant to be used when called by tripleo-heat-templates.
compute_tsx_8_3_version: <'4.18.0-240'> -- This is the kernel version that requires to have TSX flag enabled

Dependencies

No dependencies.

Example Playbook

Standard playbook

- hosts: nova_libvirt
  roles:
  - { role: compute_tsx}

Reporting playbook with no failure

- hosts: nova_libvirt
  vars:
  - compute_tsx_warning: true
  roles:
  - { role: compute_tsx}

License

Apache

Author Information

Red Hat TripleO DFG:Compute Deployment Squad

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