Created attachment 1422148 [details]
command output

Description of problem:
Trying to add a second rhel-guest-image-7.5 VM - while there are enough resources - shows ERROR "No valid host was found".

Version-Release number of selected component:
OSP 13  -  2018-03-20.2

How reproducible:
Always

Steps to Reproduce:

1) Add rhel 7.5 image and flavor:

curl -o /tmp/rhel75.qcow2 http://rhos-qe-mirror-tlv.usersys.redhat.com/rel-eng/latest-RHEL-7.5/compose/Server/x86_64/images/rhel-guest-image-7.5-146.x86_64.qcow2

openstack image create rhel75 --disk-format qcow2 --container-format bare --public --file /tmp/rhel75.qcow2

openstack flavor create --ram 2048 --disk 10 --vcpus 1 --id auto rhel7


2) Create network:

. overcloudrc

openstack network create int_net 

int_net_id=$(openstack network show int_net -c id -f value)


3) Create first RHEL vm:

openstack server create vm-rht-1 --flavor rhel7 --nic net-id=$int_net_id --image rhel75


4) Create second RHEL vm:

openstack server create vm-rht-2 --flavor rhel7 --nic net-id=$int_net_id --image rhel75

5) Check VMs status:
nova hypervisor-stats
nova list
nova show vm-rht-2

-----

Actual results:

Despite there are enough resources:

+----------------------+-------+
| Property             | Value |
+----------------------+-------+
| count                | 2     |
| current_workload     | 0     |
| disk_available_least | 87    |
| free_disk_gb         | 102   |
| free_ram_mb          | 3838  |
| local_gb             | 118   |
| local_gb_used        | 16    |
| memory_mb            | 16382 |
| memory_mb_used       | 12544 |
| running_vms          | 5     |
| vcpus                | 12    |
| vcpus_used           | 5     |
+----------------------+-------+


vm-rht-2 status shows ERROR:

"No valid host was found. ", "code": 500, "details": "  File \"/usr/lib/python2.7/site-packages/nova/conductor/manager.py\", line 1116, in schedule_and_build_instances


Expected results:

If there are enough resources, all VMs should show ACTIVE status.

Additional info:
Commands output, logs, and SOS report attached hereby.