Answer by sgordon for I am trying to get a simple cirrus VM up on a kilo implementation on CentOS with two nodes. One controller and one compute. I get a 'No valid host was found' in the nova-conductor.log file. My nova service list output is: +----+------------------+-----------+----------+---------+-------+----------------------------+-----------------+ | Id | Binary | Host | Zone | Status | State | Updated_at | Disabled Reason | +----+------------------+-----------+----------+---------+-------+----------------------------+-----------------+ | 1 | nova-consoleauth | anders-38 | internal | enabled | up | 2015-06-01T12:52:53.000000 | - | | 2 | nova-conductor | anders-38 | internal | enabled | up | 2015-06-01T12:52:53.000000 | - | | 3 | nova-scheduler | anders-38 | internal | enabled | up | 2015-06-01T12:52:53.000000 | - | | 4 | nova-cert | anders-38 | internal | enabled | up | 2015-06-01T12:52:53.000000 | - | | 5 | nova-compute | anders-21 | nova | enabled | up | 2015-06-01T12:52:57.000000 | - | | 6 | nova-network | anders-21 | internal | enabled | up | 2015-06-01T12:52:57.000000 | - | +----+------------------+-----------+----------+---------+-------+----------------------------+-----------------+ [root@anders-21 ~]# my nova hypervisor-stats output is: [root@anders-21 ~]# nova hypervisor-stats +----------------------+-------+ | Property | Value | +----------------------+-------+ | count | 1 | | current_workload | 0 | | disk_available_least | 91 | | free_disk_gb | 104 | | free_ram_mb | 14789 | | local_gb | 105 | | local_gb_used | 1 | | memory_mb | 15813 | | memory_mb_used | 1024 | | running_vms | 1 | | vcpus | 8 | | vcpus_used | 1 | +----------------------+-------+ Any ideas? Thanks! Don

The **NoValidHost** error is encountered when the scheduler filters eliminate all available hosts as potential targets for the instance. To confirm which filter(s) are rejecting hosts set **debug=True** in the **/etc/nova/nova.conf** on the node(s) running the scheduler and restart the scheduler service. Then re-attempt instance creation and watch the **/var/log/nova/scheduler.log** file for lines like: [req-... None] Starting with 3 host(s) [req-... None] Filter RetryFilter returned 3 host(s) [req-... None] Filter AvailabilityZoneFilter returned 3 host(s) [req-... None] Filter RamFilter returned 2 host(s) ... [req-... None] Filtered [(localhost.localdomain, localhost.localdomain) ram:3208 disk:7168 io_ops:0 instances:1] _schedule ... [req-... None] Weighed [WeighedHost [host: (localhost.localdomain, localhost.localdomain) ram:3208 disk:7168 io_ops:0 instances:1, weight: 1.0]] ... Note that these lines were redacted somewhat for brevity. From this output you can determine which filter(s) eliminated hosts.