如何配置Openstack，使其认为32 vcpu可用，而不是16 vcpu？

Question

OpenStack Xena CentOS 8流

我的任务是从16 vCPU增加到32 vCPU。我想多做点事，但不管用。

我有一个控制器和一个计算。计算输出：

[root@controller ~(keystone)]# openstack hypervisor stats show
+----------------------+-------+
| field | value |
+----------------------+-------+
| count | 1 |
| current_workload | 0 |
| disk_available_least | 62 |
| free_disk_gb | 69 |
| free_ram_mb | 31326 |
| local_gb | 69 |
| local_gb_used | 0 |
| memory_mb | 31838 |
| memory_mb_used | 512 |
| running_vms | 0 |
| vcpus | 16 |
| vcpus_used | 0 |
+----------------------+-------+

默认情况下，在/etc/nova/nova.conf中计算：

# Virtual CPU to physical CPU allocation ratio. For more information, refer to
# the documentation. (floating point value)
# Minimum value: 0.0
#cpu_allocation_ratio=<None>

我做了这个：cpu_allocation_ratio=2.0，然后是systemctl restart openstack-nova-compute。在那之后，我又做了一次openstack hypervisor stats show，并看到16个vCPU仍然可用。

/etc/nova/nova.conf还有一种选择：

#
# Initial virtual CPU to physical CPU allocation ratio. For more information,
# refer to the documentation. (floating point value)
# Minimum value: 0.0
#initial_cpu_allocation_ratio=16.0

我试着设置initial_cpu_allocation_ratio=32.0，但这也没有帮助。

此外，我只发现了关于过度提交https://docs.openstack.org/arch-design/design-compute/design-compute-overcommit.html的此类文档，但没有说明如何正确配置它。

Answer 1

检查分配比率：

openstack resource provider inventory list 4f35070b-df79-41d1-88e0-831e5f210497
    +----------------+------------------+----------+----------+----------+-----------+--------+--------+
    | resource_class | allocation_ratio | min_unit | max_unit | reserved | step_size |  total |   used |
    +----------------+------------------+----------+----------+----------+-----------+--------+--------+
    | VCPU           |             2.08 |        1 |      112 |        0 |         1 |    112 |    222 |
    | MEMORY_MB      |             1.18 |        1 |   515164 |     8192 |         1 | 515164 | 395264 |
    | DISK_GB        |             0.98 |        1 |     7150 |        0 |         1 |   7150 |   2985 |
    +----------------+------------------+----------+----------+----------+-----------+--------+--------+

如果您需要得到计算值：

openstack allocation candidate list --resource MEMORY_MB=1 -f json -c "inventory used/capacity" -c "resource provider"
[
  {
    "resource provider": "4f35070b-df79-41d1-88e0-831e5f210497",
    "inventory used/capacity": "VCPU=222/232,MEMORY_MB=395264/598226,DISK_GB=2985/7007"
  }
]