CPU changes do not trigger a system reboot (so return a VMware error CPU hot plug is not supported for this virtual machine.)

[mattrawles]

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Terraform

1.9.8

Terraform Provider

2.11.1

VMware vSphere

8.0.3.00400 vCenter Server 8.0 Update 3d (ESXi 7.0.3)

Description

When decreasing CPU in a vsphere_virtual_machine resource, we expect a system to reboot and apply the change.

The resource returns an error

Error: CPU hot plug is not supported for this virtual machine.

This error is also reported in the vsphere console.

Note on the same system RAM or RAM/CPU combined change (reductions) trigger a reboot, RAM/CPU increases apply hot without a reboot. System has hot CPU and RAM add enabled.

Affected Resources or Data Sources

vsphere_virtual_machine

Terraform Configuration

Changes in vsphere_virtual_machine of "num_cpus"

Debug Output

Terraform will perform the following actions:

module.instances.module.vsphere-instance.vsphere_virtual_machine.linux-vm["ld12925-lab-30"] will be updated in-place

~ resource "vsphere_virtual_machine" "linux-vm" {
id = "4236b3fd-a3bb-99f8-8464-881ed7e7300b"
name = "ld12925-lab-30"
~ num_cpus = 2 -> 1
~ tags = [

    ]
    # (74 unchanged attributes hidden)

    # (4 unchanged blocks hidden)
}

Plan: 0 to add, 1 to change, 0 to destroy.

Error: CPU hot plug is not supported for this virtual machine.

with module.instances.module.vsphere-instance.vsphere_virtual_machine.linux-vm["ld12925-lab-30"],
on .terraform/modules/instances.vsphere-instance/linux.tf line 1, in resource "vsphere_virtual_machine" "linux-vm":
1: resource "vsphere_virtual_machine" "linux-vm" {

Panic Output

No response

Expected Behavior

CPU remove should trigger a reboot.

Note on the same system RAM or RAM/CPU combined change (reductions) trigger a reboot, RAM/CPU increases apply hot.

ESXi 7 doesn't support hot CPU removal so terraform should not attempt it

https://knowledge.broadcom.com/external/article?legacyId=82568

Actual Behavior

Error: CPU hot plug is not supported for this virtual machine.

with module.instances.module.vsphere-instance.vsphere_virtual_machine.linux-vm["ld12925-lab-30"],
on .terraform/modules/instances.vsphere-instance/linux.tf line 1, in resource "vsphere_virtual_machine" "linux-vm":
1: resource "vsphere_virtual_machine" "linux-vm" {

Steps to Reproduce

create a vsphere_virtual_machine
increase its RAM/CPU as desired - hot add works as expected
reduce the CPU only - apply triggers vcentre error (not the expected reboot).

Environment Details

8.0.3.00400 vCenter Server 8.0 Update 3d (ESXi 7.0.3)

Screenshots

No response

References

https://knowledge.broadcom.com/external/article?legacyId=82568

[github-actions]

Hello, mattrawles! 🖐

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