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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. Co-Authored-By: Martin Schuppert <mschuppert@redhat.com> Related: https://bugzilla.redhat.com/1923165 Closes-Bug: #1916758 Change-Id: Icfcfb1c07bbfbe05d27d67187d941c0c34fad2b2 |
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README.md |
README.md
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 executioncompute_tsx_warning
: <'false'> -- Will not return a failure, but will simply print the failurecompute_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