Hi, these lines indicate that the compute node has been discovered successfully: [root@controller0 ~]# /bin/sh -c "nova-manage cell_v2 list_hosts" +-----------+--------------------------------------+---------------------+ | Cell Name | Cell UUID | Hostname | +-----------+--------------------------------------+---------------------+ | cell1 | 79648906-0ea8-4672-8c5f-73d5998a7b73 | compute0.os.lab.com | +-----------+--------------------------------------+---------------------+ The "No valid host was found" message can mean many things, you could turn on debug logs for nova and see what exactly it complains about. Zitat von André Ferreira <andreocferreira@gmail.com>:

Hello,

I'm trying to setup an openstack cluster by following the instructions on https://docs.openstack.org/install-guide/openstack-services.html#minimal-dep...

I'm using two CentOS8 VMs: - VM1: controller node - VM2: compute node

After installing all the minimum services, I've tried to create a server instance but it's failing.

From the logs, looks like that nova is not able to find a compute node to launch the instance:

2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager [req-c1aa668e-73db-4799-baa4-d782ec5986e9 e6529a38880d4efcb55308277aeabb88 6a857bb3fb7f47849ff5a11d97968344 - default default] Failed to schedule i host was found. Traceback (most recent call last):

File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/server.py", line 241, in inner return func(*args, **kwargs)

File "/usr/lib/python3.6/site-packages/nova/scheduler/manager.py", line 209, in select_destinations raise exception.NoValidHost(reason="")

nova.exception.NoValidHost: No valid host was found. 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager Traceback (most recent call last): 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/nova/conductor/manager.py", line 1549, in schedule_and_build_instances 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager instance_uuids, return_alternates=True) 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/nova/conductor/manager.py", line 910, in _schedule_instances 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager return_alternates=return_alternates) 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/nova/scheduler/client/query.py", line 42, in select_destinations 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager instance_uuids, return_objects, return_alternates) 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/nova/scheduler/rpcapi.py", line 160, in select_destinations 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager return cctxt.call(ctxt, 'select_destinations', **msg_args) 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/client.py", line 192, in call 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager retry=self.retry, transport_options=self.transport_options) 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/oslo_messaging/transport.py", line 128, in _send 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager transport_options=transport_options) 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 691, in send 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager transport_options=transport_options) 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 681, in _send 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager raise result 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager nova.exception_Remote.NoValidHost_Remote: No valid host was found. 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager Traceback (most recent call last): 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/server.py", line 241, in inner 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager return func(*args, **kwargs) 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager File "/usr/lib/python3.6/site-packages/nova/scheduler/manager.py", line 209, in select_destinations 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager raise exception.NoValidHost(reason="") 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager 2022-11-15 16:54:11.889 3963 ERROR nova.conductor.manager nova.exception.NoValidHost: No valid host was found

From nova-scheduler: 2022-11-15 16:54:11.797 3978 INFO nova.scheduler.manager [req-c1aa668e-73db-4799-baa4-d782ec5986e9 e6529a38880d4efcb55308277aeabb88 6a857bb3fb7f47849ff5a11d97968344 - default default] Got no allocation can cient resources or a temporary occurrence as compute nodes start up. 2022-11-15 16:54:23.160 3978 DEBUG oslo_service.periodic_task [req-d477e747-537b-48b2-8913-ef84447d5a21 - - - - -] Running periodic task SchedulerManager._discover_hosts_in_cells run_periodic_tasks /usr/li 2022-11-15 16:54:23.169 3978 DEBUG oslo_concurrency.lockutils [req-4dbefd76-0b81-47d9-b6cf-382f43e3505e - - - - -] Lock "79648906-0ea8-4672-8c5f-73d5998a7b73" acquired by "nova.context.set_target_cell.<loc .000s inner /usr/lib/python3.6/site-packages/oslo_concurrency/lockutils.py:390 2022-11-15 16:54:23.170 3978 DEBUG oslo_concurrency.lockutils [req-4dbefd76-0b81-47d9-b6cf-382f43e3505e - - - - -] Lock "79648906-0ea8-4672-8c5f-73d5998a7b73" "released" by "nova.context.set_target_cell.<l .001s inner /usr/lib/python3.6/site-packages/oslo_concurrency/lockutils.py:405 2022-11-15 16:54:59.097 3977 DEBUG oslo_service.periodic_task [req-bb4ca11b-2089-414c-b8d5-6c45aa58c1bf - - - - -] Running periodic task SchedulerManager._discover_hosts_in_cells run_periodic_tasks /usr/li 2022-11-15 16:54:59.112 3977 DEBUG oslo_concurrency.lockutils [req-cf62a2b4-6721-4f98-a97d-7b51e58a34b3 - - - - -] Lock "79648906-0ea8-4672-8c5f-73d5998a7b73" acquired by "nova.context.set_target_cell.<loc .000s inner /usr/lib/python3.6/site-packages/oslo_concurrency/lockutils.py:390 2022-11-15 16:54:59.113 3977 DEBUG oslo_concurrency.lockutils [req-cf62a2b4-6721-4f98-a97d-7b51e58a34b3 - - - - -] Lock "79648906-0ea8-4672-8c5f-73d5998a7b73" "released" by "nova.context.set_target_cell.<l .001s inner /usr/lib/python3.6/site-packages/oslo_concurrency/lockutils.py:405

The problem is that the compute node is not placed on the cell. The list of hypervisors is also empty. I've searched online but I don't find a way to fix this.

(admin-rc) [andrefe@controller0 ~]$ openstack compute service list +--------------------------------------+----------------+------------------------+----------+---------+-------+----------------------------+ | ID | Binary | Host | Zone | Status | State | Updated At | +--------------------------------------+----------------+------------------------+----------+---------+-------+----------------------------+ | fa781cbb-732c-43db-8c9f-4c31bd73bbd2 | nova-scheduler | controller0.os.lab.com | internal | enabled | up | 2022-11-15T15:59:40.000000 | | 106e9574-5ae3-45e2-a7c2-09ce3624a1d6 | nova-conductor | controller0.os.lab.com | internal | enabled | up | 2022-11-15T15:59:40.000000 | | 28072820-609a-4066-abc8-affea51c3600 | nova-compute | compute0.os.lab.com | nova | enabled | up | 2022-11-15T15:59:41.000000 | +--------------------------------------+----------------+------------------------+----------+---------+-------+----------------------------+

[root@controller0 ~]# /bin/sh -c "nova-manage cell_v2 list_cells" nova +-------+--------------------------------------+-------------------------------------------+--------------------------------------------------+----------+ | Name | UUID | Transport URL | Database Connection | Disabled | +-------+--------------------------------------+-------------------------------------------+--------------------------------------------------+----------+ | cell0 | 00000000-0000-0000-0000-000000000000 | none:/ | mysql+pymysql://nova:****@controller0/nova_cell0 | False | | cell1 | 79648906-0ea8-4672-8c5f-73d5998a7b73 | rabbit://openstack:****@controller0:5672/ | mysql+pymysql://nova:****@controller0/nova | False | +-------+--------------------------------------+-------------------------------------------+--------------------------------------------------+----------+

[root@controller0 ~]# /bin/sh -c "nova-manage cell_v2 list_hosts" +-----------+--------------------------------------+---------------------+ | Cell Name | Cell UUID | Hostname | +-----------+--------------------------------------+---------------------+ | cell1 | 79648906-0ea8-4672-8c5f-73d5998a7b73 | compute0.os.lab.com | +-----------+--------------------------------------+---------------------+

[root@controller0 ~]# /bin/sh -c "nova-manage cell_v2 discover_hosts --verbose" nova Found 2 cell mappings. Skipping cell0 since it does not contain hosts. Getting computes from cell 'cell1': 79648906-0ea8-4672-8c5f-73d5998a7b73 Found 0 unmapped computes in cell: 79648906-0ea8-4672-8c5f-73d5998a7b73

(admin-rc) [andrefe@controller0 ~]$ nova hypervisor-list +----+---------------------+-------+--------+ | ID | Hypervisor hostname | State | Status | +----+---------------------+-------+--------+ +----+---------------------+-------+--------+

Any idea on how I can fix this and add the compute to the cell?

Thanks.