Python OpenStack SDK does not return Hypervisor hostname

Sean Mooney smooney at
Tue Jun 23 23:37:34 UTC 2020

On Tue, 2020-06-23 at 13:12 -0700, Anil Jangam wrote:
> I have written a client code as follows.
> # Get Hypervisor details
> try:
>     print(f"+----------------------------------------------------------+")
>     print(f"| Hypervisor details                                       |")
>     print(f"+----------------------------------------------------------+")
>     for hypervisor in conn.list_hypervisors():
>         print(f"Hypervisor is: {hypervisor}")
>         print(f"Hypervisor status:      {hypervisor.status}")
>         print(f"Hypervisor vcpus:       {hypervisor.vcpus_used}")
>         print(f"Hypervisor type:        {hypervisor.hypervisor_type}")
>         print(f"Hypervisor id:          {}")
>         print(f"Hypervisor state:       {hypervisor.state}")
>         print(f"Hypervisor host IP:     {hypervisor.host_ip}")
>         print(f"Hypervisor running VMs: {hypervisor.running_vms}")
>         print(f"Hypervisor running VMs: {hypervisor.vcpus}")
>         print(f"Hypervisor hostname:    {hypervisor.hypervisor_hostname}")
>         print(f"")
> except EndpointNotFound as exp:
>     print("Error: {}".format(exp))
>     print(f"")
> When I print the 'hypervisor' object itself, most of the values are printed
> as shown below, however when I try to access
> 'hypervisor.hypervisor_hostname', it throws an exception.
> +----------------------------------------------------------+
> > Hypervisor details                                       |
> +----------------------------------------------------------+
> Hypervisor is: openstack.compute.v2.hypervisor.Hypervisor(status=enabled,
> service={'host': 'cl3-Compute3', 'disabled_reason': None, 'id':
> '34db399d-25b9-4004-98b9-2d8bbce7b228'}, vcpus_used=0,
> hypervisor_type=QEMU, local_gb_used=0, vcpus=52,
> hypervisor_hostname=cl3-Compute3, memory_mb_used=25600, memory_mb=262032,
> current_workload=0, state=up, host_ip=, cpu_info={'arch':
> 'x86_64', 'model': 'Broadwell', 'vendor': 'Intel', 'features': ['pge',
> 'avx', 'xsaveopt', 'clflush', 'sep', 'rtm', 'tsc_adjust', 'tsc-deadline',
> 'dtes64', 'invpcid', 'tsc', 'fsgsbase', 'xsave', 'smap', 'vmx', 'erms',
> 'xtpr', 'cmov', 'hle', 'smep', 'pcid', 'est', 'pat', 'monitor', 'smx',
> 'pbe', 'lm', 'msr', 'adx', '3dnowprefetch', 'nx', 'fxsr', 'syscall', 'tm',
> 'sse4.1', 'pae', 'sse4.2', 'pclmuldq', 'acpi', 'fma', 'vme', 'popcnt',
> 'mmx', 'osxsave', 'cx8', 'mce', 'de', 'rdtscp', 'ht', 'dca', 'lahf_lm',
> 'abm', 'rdseed', 'pdcm', 'mca', 'pdpe1gb', 'apic', 'sse', 'f16c', 'pse',
> 'ds', 'invtsc', 'pni', 'tm2', 'avx2', 'aes', 'sse2', 'ss', 'ds_cpl',
> 'arat', 'bmi1', 'bmi2', 'ssse3', 'fpu', 'cx16', 'pse36', 'mtrr', 'movbe',
> 'rdrand', 'x2apic'], 'topology': {'cores': 14, 'cells': 2, 'threads': 2,
> 'sockets': 1}}, running_vms=0, free_disk_gb=852,
> hypervisor_version=2012000, disk_available_least=849, local_gb=852,
> free_ram_mb=236432, id=1130407d-5afd-41f9-bc0c-2d7babda3ce7,
> location=Munch({'cloud': 'defaults', 'region_name': 'RegionOne', 'zone':
> None, 'project': Munch({'id': '6d4f1b107bbf4b94832f7ef72df61ef2', 'name':
> '5g', 'domain_id': None, 'domain_name': 'default'})}))
> Hypervisor status: enabled
> Hypervisor vcpus: 0
> Hypervisor type:     QEMU
> Hypervisor id: 1130407d-5afd-41f9-bc0c-2d7babda3ce7
> Hypervisor state: up
> Hypervisor host IP:
> Hypervisor running VMs: 0
> Hypervisor running VMs: 52
> Traceback (most recent call last):
>   File "/Users/workspace/testprogs/python/opsviz/", line 321,
> in <module>
>     main()
>   File "/Users/workspace/testprogs/python/opsviz/", line 317,
> in main
>     print_servers()
>   File "/Users/workspace/testprogs/python/opsviz/", line 115,
> in print_servers
>     print(f"Hypervisor hostname: {hypervisor.hypervisor_hostname}")
>   File
> "/Users/inventory/lib/python3.7/site-packages/openstack/", line
> 588, in __getattribute__
>     raise e
>   File
> "/Users/inventory/lib/python3.7/site-packages/openstack/", line
> 582, in __getattribute__
>     return object.__getattribute__(self, name)
> AttributeError: 'Hypervisor' object has no attribute 'hypervisor_hostname'
> Is there anything wrong with the use of the API? How do I get the
> hypervisor hostname in my application code?

looking at the fields that are in the hypervior object you are not hitting the /os-hypervisors
list hyperviors endpoint but are instead hittig the /os-hypervisors/detail endpoint which inluded extra info
both shoudl contain hypervisor_hostname
is the doc for that api.

by default this is an admin only api.
sean at pop-os:~$ openstack --os-cloud sean hypervisor list
Policy doesn't allow os_compute_api:os-hypervisors:list-detail to be performed. (HTTP 403) (Request-ID: req-fbc50741-

so the fact that you are geting any results indicates that you are using admin creditals so you should recive the full
responce and looking at the raw hypervisor print output i has the info so i would guess that its jut missing a property.

looking at
it would appear that hypervisor_hostname is being stored in the name property.

im not sure why some of the fields where renamed
that feels like a poor desigin choice as it basically means the upstream api docs are not enough to use the sdk
you need to girue out what then mapped the fields too.

the object also obviously contains the raw values too or they would not print when you print the object.

that is because that is falling back to the base resouce __repr__ function
which prints the raw values.

at least i think that is what happening i have not looked at the sdk closely before.

> Thank you.

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