CNI Fails on New Node Due to x86-64-v2 CPU Incompatibility

Problem

  • After adding a new compute node, services such as CNI failed to start with the following error:

Error: failed to create ambient nodeagent service: error initializing mesh dataplane: error configuring iptables: failed to execute iptables-save: exit status 127 Fatal glibc error: CPU does not support x86-64-v2

Environment

  • Platform9 Private Cloud Director - v2025.4 and Higher

  • Component - Kubernetes

Cause

  • This issue is typically caused by using a legacy virtual CPU model (qemu64) in the Nova compute configuration (nova_override.conf), which does not expose modern CPU instruction sets required by containerized services compiled against the x86-64-v2 microarchitecture baseline.

Resolution

  • Edit the nova_override.conf on the affected node to use a modern virtual CPU model, as below:

[libvirt]
cpu_models = <modern-virtual-cpu-name>

  • Restart the pf9-ostackhost service to apply the changes:

$ sudo systemctl restart pf9-ostackhost

  • Migrate or recreate the VMs hosted on the affected node.


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CNI Fails on New Node Due to x86-64-v2 CPU IncompatibilityProblemEnvironmentCauseResolution