I have installed openstack rocky with packstack. I have a controller node, compute node, network node and storage node.

When I want to lunch a new instance (with cirros), I get this error:

Error: Failed to perform requested operation on instance "test0", the instance has an error status: Please try again later [Error: No valid host was found. ].

here is the output of nova service-list:

+--------------------------------------+------------------+------------+----------+---------+-------+----------------------------+-----------------+-------------+
| Id                                   | Binary           | Host       | Zone     | Status  | State | Updated_at                 | Disabled Reason | Forced down |
+--------------------------------------+------------------+------------+----------+---------+-------+----------------------------+-----------------+-------------+
| ca6dd0a7-1278-4e42-8cec-8785e3f8ce87 | nova-conductor   | controller | internal | enabled | up    | 2018-12-02T05:38:03.000000 | -               | False       |
| d1c50908-e10c-437f-82be-6f39cba9bbe3 | nova-scheduler   | controller | internal | enabled | up    | 2018-12-02T05:38:03.000000 | -               | False       |
| 45c7ab7f-7d87-4ccf-940b-80a6b7bc0647 | nova-consoleauth | controller | internal | enabled | up    | 2018-12-02T05:38:07.000000 | -               | False       |
| 9bc71327-f30e-43bc-8ac1-2f14b8c3e9f8 | nova-compute     | compute    | nova     | enabled | up    | 2018-12-02T05:38:03.000000 | -               | False       |
+--------------------------------------+------------------+------------+----------+---------+-------+----------------------------+-----------------+-------------+

output of neutron agent-list:

+--------------------------------------+--------------------+---------+-------------------+-------+----------------+---------------------------+
| id                                   | agent_type         | host    | availability_zone | alive | admin_state_up | binary                    |
+--------------------------------------+--------------------+---------+-------------------+-------+----------------+---------------------------+
| 4720b675-8b10-4fe8-906c-8635371c2138 | L3 agent           | network | nova              | :-)   | True           | neutron-l3-agent          |
| 4832cfdb-4753-48f5-8037-778fd314a4b4 | Metadata agent     | network |                   | :-)   | True           | neutron-metadata-agent    |
| 4a7071c6-32d7-40ff-be71-8fd7da52fe97 | Open vSwitch agent | compute |                   | :-)   | True           | neutron-openvswitch-agent |
| 62ed3331-2bd2-4005-87ff-08caa3035562 | DHCP agent         | network | nova              | :-)   | True           | neutron-dhcp-agent        |
| ba9666b6-2ba7-472c-b448-8c4a8277cb11 | Open vSwitch agent | network |                   | :-)   | True           | neutron-openvswitch-agent |
| f712ddb6-736a-413d-8aef-9458ea0696b7 | Metering agent     | network |                   | :-)   | True           | neutron-metering-agent    |
+--------------------------------------+--------------------+---------+-------------------+-------+----------------+---------------------------+

and output of nova hypervisor-stats:

+----------------------+-------+
| Property             | Value |
+----------------------+-------+
| count                | 0     |
| current_workload     | 0     |
| disk_available_least | 0     |
| free_disk_gb         | 0     |
| free_ram_mb          | 0     |
| local_gb             | 0     |
| local_gb_used        | 0     |
| memory_mb            | 0     |
| memory_mb_used       | 0     |
| running_vms          | 0     |
| vcpus                | 0     |
| vcpus_used           | 0     |
+----------------------+-------+

I have installed rocky and the vm wich compute node is installed on has 8 gb of ram, two processors and 20 gb of storage

How can I solve this?