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Thanks Matt.

Here are the steps I have performed, I dont see any error related to cell0
now but n-cond still not able to detect computes after discover as well :(.

Do we need any cell setting on nova-compute nodes as well?.

vmware at cntr11:~/nsbu_cqe_openstack/devstack$ nova service-list
+----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary           | Host          | Zone     | Status  | State |
Updated_at                 | Disabled Reason |
+----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
| 7  | nova-conductor   | cntr11        | internal | enabled | up    |
2017-02-22T14:23:34.000000 | -               |
| 9  | nova-scheduler   | cntr11        | internal | enabled | up    |
2017-02-22T14:23:28.000000 | -               |
| 10 | nova-consoleauth | cntr11        | internal | enabled | up    |
2017-02-22T14:23:33.000000 | -               |
| 11 | nova-compute     | esx-ubuntu-02 | nova     | enabled | up    |
2017-02-22T14:23:35.000000 | -               |
| 12 | nova-compute     | esx-ubuntu-03 | nova     | enabled | up    |
2017-02-22T14:23:35.000000 | -               |
| 13 | nova-compute     | esx-ubuntu-01 | nova     | enabled | up    |
2017-02-22T14:23:28.000000 | -               |
| 14 | nova-compute     | kvm-3         | nova     | enabled | up    |
2017-02-22T14:23:28.000000 | -               |
| 15 | nova-compute     | kvm-1         | nova     | enabled | up    |
2017-02-22T14:23:32.000000 | -               |
| 16 | nova-compute     | kvm-2         | nova     | enabled | up    |
2017-02-22T14:23:32.000000 | -               |
+----+------------------+---------------+----------+---------+-------+----------------------------+-----------------+
vmware at cntr11:~/nsbu_cqe_openstack/devstack$
vmware at cntr11:~/nsbu_cqe_openstack/devstack$ nova-manage cell_v2 map_cell0
--database_connection mysql+pymysql://
root:vmware at 127.0.0.1/nova?charset=utf8
vmware at cntr11:~/nsbu_cqe_openstack/devstack$ nova-manage cell_v2
simple_cell_setup --transport-url rabbit://
stackrabbit:vmware at 60.0.24.49:5672/
Cell0 is already setup
vmware at cntr11:~/nsbu_cqe_openstack/devstack$ nova-manage cell_v2 list_cells
+-------+--------------------------------------+
|  Name |                 UUID                 |
+-------+--------------------------------------+
|  None | ea6bec24-058a-4ba2-8d21-57d34c01802c |
| cell0 | 00000000-0000-0000-0000-000000000000 |
+-------+--------------------------------------+
vmware at cntr11:~/nsbu_cqe_openstack/devstack$ nova-manage cell_v2
discover_hosts --verbose
Found 2 cell mappings.
Skipping cell0 since it does not contain hosts.
Getting compute nodes from cell: ea6bec24-058a-4ba2-8d21-57d34c01802c
Found 6 computes in cell: ea6bec24-058a-4ba2-8d21-57d34c01802c
Checking host mapping for compute host 'kvm-3':
a4b175d6-f5cc-45a8-9cf2-45726293b5c5
Checking host mapping for compute host 'esx-ubuntu-02':
70281329-590c-4cb7-8839-fd84160345b7
Checking host mapping for compute host 'esx-ubuntu-03':
04ea75a2-789e-483e-8d0e-4b0f79e012dc
Checking host mapping for compute host 'kvm-1':
dfabae3c-4ea9-4e8f-a496-8880dd9e89d9
Checking host mapping for compute host 'kvm-2':
d1cb30f5-822c-4c18-81fb-921ca676b834
Checking host mapping for compute host 'esx-ubuntu-01':
d00f8f16-af6b-437d-8136-bc744eb2472f
vmware at cntr11:~/nsbu_cqe_openstack/devstack$

​n-sch:
2017-02-22 14:26:51.467 INFO nova.scheduler.host_manager
[req-56d1cefb-1dfb-481d-aaff-b7b6e05f83f0 None None] Successfully synced
instances from host 'kvm-2'.
2017-02-22 14:26:51.608 INFO nova.scheduler.host_manager
[req-690b1a18-a709-49b2-bfad-2a6a75a3bee2 None None] Successfully synced
instances from host 'kvm-3'.
2017-02-22 14:27:23.366 INFO nova.filters
[req-1085ec50-29f7-4946-81e2-03c1378e8077 alt_demo admin] Filter
RetryFilter returned 0 hosts
2017-02-22 14:27:23.367 INFO nova.filters
[req-1085ec50-29f7-4946-81e2-03c1378e8077 alt_demo admin] Filtering removed
all hosts for the request with instance ID
'c74f394f-c805-4b5c-ba42-507dfda2c5be'. Filter results: ['RetryFilter:
(start: 0, end: 0)']


n-cond:
​
2017-02-22 14:27:23.375 TRACE nova.conductor.manager   File
"/opt/stack/nova/nova/scheduler/filter_scheduler.py", line 79, in
select_destinations
2017-02-22 14:27:23.375 TRACE nova.conductor.manager     raise
exception.NoValidHost(reason=reason)
2017-02-22 14:27:23.375 TRACE nova.conductor.manager
2017-02-22 14:27:23.375 TRACE nova.conductor.manager NoValidHost: No valid
host was found. There are not enough hosts available.
2017-02-22 14:27:23.375 TRACE nova.conductor.manager
2017-02-22 14:27:23.375 TRACE nova.conductor.manager
2017-02-22 14:27:23.424 WARNING nova.scheduler.utils
[req-1085ec50-29f7-4946-81e2-03c1378e8077 alt_demo admin] Failed to
compute_task_build_instances: No valid host was found. There are not enough
hosts available.
Traceback (most recent call last):

  File
"/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line
218, in inner
    return func(*args, **kwargs)

  File "/opt/stack/nova/nova/scheduler/manager.py", line 98, in
select_destinations
    dests = self.driver.select_destinations(ctxt, spec_obj)

  File "/opt/stack/nova/nova/scheduler/filter_scheduler.py", line 79, in
select_destinations
    raise exception.NoValidHost(reason=reason)

NoValidHost: No valid host was found. There are not enough hosts available.

2017-02-22 14:27:23.425 WARNING nova.scheduler.utils
[req-1085ec50-29f7-4946-81e2-03c1378e8077 alt_demo admin] [instance:
c74f394f-c805-4b5c-ba42-507dfda2c5be] Setting instance to ERROR state.

On Wed, Feb 22, 2017 at 5:44 PM, Matt Riedemann <mriedemos at gmail.com> wrote:

> On 2/21/2017 10:38 AM, Prashant Shetty wrote:
>
>> Hi Mark,
>>
>> Thanks for your reply.
>>
>> I tried "nova-manage cell_v2 discover_hosts" and it returned nothing and
>> still I have same issue on the node.
>>
>> Problem seems be the way devstack is getting configured,
>> As code suggest below we create cell0 on node where n-api and n-cpu
>> runs. In my case compute is running only n-cpu and controller is running
>> n-api service, due to this code there are no cell created in controller
>> or compute.
>>
>
> The nova_cell0 database is created here:
>
> https://github.com/openstack-dev/devstack/blob/7a30c7fcabac1
> cf28fd9baa39d05436680616aef/lib/nova#L680
>
> That's the same place that the nova_api database is created.
>
>
>> We will not have this  problem in all-in-one-node setup.
>> --
>> # Do this late because it requires compute hosts to have started
>> if is_service_enabled n-api; then
>>     if is_service_enabled n-cpu; then
>>         create_cell
>>     else
>>         # Some CI systems like Hyper-V build the control plane on
>>         # Linux, and join in non Linux Computes after setup. This
>>         # allows them to delay the processing until after their whole
>>         # environment is up.
>>         echo_summary "SKIPPING Cell setup because n-cpu is not enabled.
>> You will have to do this manually before you have a working environment."
>>     fi
>> fi
>>
>
> You're correct that when stacking the control node where n-api is running,
> you won't get to the create_cell call:
>
> https://github.com/openstack-dev/devstack/blob/7a30c7fcabac1
> cf28fd9baa39d05436680616aef/stack.sh#L1371
>
> The create_cell function is what creates the cell0 mapping in the nova_api
> database and runs the simple_cell_setup command:
>
> https://github.com/openstack-dev/devstack/blob/7a30c7fcabac1
> cf28fd9baa39d05436680616aef/lib/nova#L943
>
> You're running discover_hosts from the control node where the nova_api
> database lives, so that looks correct.
>
> Can you run discover_hosts with the --verbose option to get some more
> details, i.e. how many cell mappings are there, how many host mappings and
> compute_nodes records are created?
>
> I think the issue is that you haven't run map_cell0 and simple_cell_setup.
> In the gating multinode CI job, the create_cell function in devstack is
> called because that's a 2-node job where n-cpu is running on both nodes,
> but n-api is only running on the control (primary) node. In your case you
> don't have that so you're going to have to run these command manually.
>
> The docs here explain how to set this up and the commands to run:
>
> https://docs.openstack.org/developer/nova/cells.html#setup-of-cells-v2
> https://docs.openstack.org/developer/nova/cells.html#fresh-install
>
>
> ---
>>
>> vmware at cntr11:~$ nova-manage cell_v2 discover_hosts
>> vmware at cntr11:~$ nova service-list
>> +----+------------------+---------------+----------+--------
>> -+-------+----------------------------+-----------------+
>> | Id | Binary           | Host          | Zone     | Status  | State |
>> Updated_at                 | Disabled Reason |
>> +----+------------------+---------------+----------+--------
>> -+-------+----------------------------+-----------------+
>> | 3  | nova-conductor   | cntr11        | internal | enabled | up    |
>> 2017-02-21T15:34:13.000000 | -               |
>> | 5  | nova-scheduler   | cntr11        | internal | enabled | up    |
>> 2017-02-21T15:34:15.000000 | -               |
>> | 6  | nova-consoleauth | cntr11        | internal | enabled | up    |
>> 2017-02-21T15:34:11.000000 | -               |
>> | 7  | nova-compute     | esx-ubuntu-02 | nova     | enabled | up    |
>> 2017-02-21T15:34:14.000000 | -               |
>> | 8  | nova-compute     | esx-ubuntu-03 | nova     | enabled | up    |
>> 2017-02-21T15:34:16.000000 | -               |
>> | 9  | nova-compute     | kvm-3         | nova     | enabled | up    |
>> 2017-02-21T15:34:07.000000 | -               |
>> | 10 | nova-compute     | kvm-2         | nova     | enabled | up    |
>> 2017-02-21T15:34:13.000000 | -               |
>> | 11 | nova-compute     | esx-ubuntu-01 | nova     | enabled | up    |
>> 2017-02-21T15:34:14.000000 | -               |
>> | 12 | nova-compute     | kvm-1         | nova     | enabled | up    |
>> 2017-02-21T15:34:09.000000 | -               |
>> +----+------------------+---------------+----------+--------
>> -+-------+----------------------------+-----------------+
>> vmware at cntr11:~$
>> vmware at cntr11:~$ nova-manage cell_v2 list_cells
>> +------+------+
>> | Name | UUID |
>> +------+------+
>> +------+------+
>> vmware at cntr11:~$
>>
>>
>> Thanks,
>> Prashant
>>
>>
> --
>
> Thanks,
>
> Matt Riedemann
>
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