old entries are left as down

Looks to be that the cinder-ceph charm sets the hostname to ceph in the cinder.conf file.

The cinder-ceph related host name issue has been resolved by bug 1493931. See that LP for more but in short, affected users will need to tidy db entries for existing volumes.

I am seeing this behavior with code that includes the fix for bug 1493931, so
this is not yet fixed.

OK, I am seeing this exact behavior on trusty-kilo.

The problem seems to be that because of the fix made for LP 1493931, the hostname
set on cinder.conf for the cinder Service is the service_name(), which on this case is cinder or cinder-ceph.

You can see this definition here: https://github.com/openstack/cinder/blob/c1870433ae72cbfacbf0909921ca18401f84653d/cinder/service.py#L243

My understanding is that this is required for HA deployments using a stateless
backend, in order to keep performing operations on the volumes, regardless of the
service location.

This is my current setup, the service is never updated since deployed,
because the report_state method is using the newly created service instance (which points to the host cinder).

mysql> select updated_at, host, report_count, topic from services;
+---------------------+-------------------------------+--------------+------------------+
| updated_at | host | report_count | topic |
+---------------------+-------------------------------+--------------+------------------+
| 2016-02-04 16:43:50 | juju-niedbalski-sec-machine-6 | 5 | cinder-scheduler |
| 2016-02-04 16:43:54 | juju-niedbalski-sec-machine-5 | 3 | cinder-scheduler |
| 2016-02-04 16:43:30 | juju-niedbalski-sec-machine-6 | 9 | cinder-volume |
| 2016-02-04 16:43:13 | juju-niedbalski-sec-machine-7 | 7 | cinder-volume |
| 2016-02-04 16:43:13 | juju-niedbalski-sec-machine-7 | 1 | cinder-scheduler |
| 2016-02-04 16:43:34 | juju-niedbalski-sec-machine-5 | 7 | cinder-volume |
| 2016-02-04 17:31:11 | cinder@cinder-ceph | 845 | cinder-volume |
| 2016-02-04 17:31:10 | cinder | 834 | cinder-scheduler |
+---------------------+-------------------------------+--------------+------------------+
8 rows in set (0.00 sec)

mysql>

However I am not entirely sure if this is approach is completely correct since after
creating a volume I can't see the reference to the host.

mysql> select host, id, size, provider_location from volumes;
+------+--------------------------------------+------+-------------------+
| host | id | size | provider_location |
+------+--------------------------------------+------+-------------------+
| NULL | fb7870b5-f0cf-4913-ac98-697c65351c15 | 10 | NULL |
+------+--------------------------------------+------+-------------------+
1 row in set (0.00 sec)

So, what's the correct fix for this? Delete the older entries on the DB after deployment?

Any suggestion?

Related: https://git.openstack.org/cgit/openstack/charm-cinder/commit/?id=b299cc84be8b6c399415fd5ee4b3ff2dc9db0492

It seems that there is an action for the charm which does exactly what Jorge described in #4
`juju run-action cinder/leader remove-services`

` removed: cinder@cinder-ceph-hdd,cinder@cinder-ceph-hdd,cinder@cinder-ceph-flash,cinder@cinder-ceph-flash,cinder@cinder-ceph-flash,cinder@cinder-ceph-hdd
`

From
```
+------------------+--------------------------+------+---------+-------+----------------------------+---------+-----------------+---------------+
| Binary | Host | Zone | Status | State | Updated_at | Cluster | Disabled Reason | Backend State |
+------------------+--------------------------+------+---------+-------+----------------------------+---------+-----------------+---------------+
| cinder-scheduler | cinder | nova | enabled | up | 2021-08-04T16:00:00.000000 | - | - | |
| cinder-volume | cinder@cinder-ceph-flash | nova | enabled | down | 2021-08-04T14:12:03.000000 | - | - | up |
| cinder-volume | cinder@cinder-ceph-flash | nova | enabled | down | 2021-08-04T14:12:08.000000 | - | - | up |
| cinder-volume | cinder@cinder-ceph-flash | nova | enabled | up | 2021-08-04T15:59:57.000000 | - | - | up |
| cinder-volume | cinder@cinder-ceph-hdd | nova | enabled | down | 2021-08-04T14:11:58.000000 | - | - | up |
| cinder-volume | cinder@cinder-ceph-hdd | nova | enabled | down | 2021-08-04T14:12:04.000000 | - | - | up |
| cinder-volume | cinder@cinder-ceph-hdd | nova | enabled | up | 2021-08-04T15:59:57.000000 | - | - | up |
+------------------+--------------------------+------+---------+-------+----------------------------+---------+-----------------+---------------+
```

to

```
Binary Host Zone Status State Updated At RPC Version Object Version Cluster
cinder-scheduler cinder nova enabled :-) 2021-08-04 16:54:27 3.12 1.38
cinder-volume cinder@cinder-ceph-hdd nova enabled :-) 2021-08-04 16:54:26 3.16 1.38
cinder-volume cinder@cinder-ceph-hdd nova enabled :-) 2021-08-04 16:54:26 3.16 1.38
cinder-volume cinder@cinder-ceph-hdd nova enabled :-) 2021-08-04 16:54:27 3.16 1.38
cinder-volume cinder@cinder-ceph-flash nova enabled :-) 2021-08-04 16:54:26 3.16 1.38
cinder-volume cinder@cinder-ceph-flash nova enabled :-) 2021-08-04 16:54:26 3.16 1.38
cinder-volume cinder@cinder-ceph-flash ...