Volume based amphora

[Vern Hart]

As of Train release, Octavia supports creating amphora instances with a cinder volume as the root disk.
https://docs.openstack.org/releasenotes/octavia/train.html

Some extra values are require in the [controller_worker] section of the octavia.conf.

 volume_driver: set to create volume backed amphorae.
 volume_size: Size of root volume for Amphora Instance
 volume_type: Type of volume for Amphorae volume root disk
 volume_create_retry_interval: wait between retries
 volume_create_timeout: timeout for volume to be created
 volume_create_max_retries: retries to create volume

The octavia charm doesn't have a config-flags config option but even if it did, these settings are not in the [DEFAULT] section so we'd need new config options.

[Vern Hart (vern)]

I misstated the section.
These configuration options should be in the [controller_worker] section.

[Andre Ruiz (andre-ruiz)]

Ok, I manually added these options to the octavia.conf file (actually I forked the charm and changed the template):

[controller_worker]
<...>
# defaults are: size=16GB, type=None, create_retry_interval=5, create_timeout=300, create_max_retries=5
volume_driver = volume_cinder_driver
volume_size = 16
volume_type = usc01-az01-abs-octavia
volume_create_retry_interval = 5
volume_create_timeout = 300
volume_create_max_retries = 5

The usc01-az01-abs-octavia type exists:

ubuntu@jumphost:~/2021-04-12-TCS-Prod1PCB-215965$ openstack volume type list
+--------------------------------------+------------------------+-----------+
| ID | Name | Is Public |
+--------------------------------------+------------------------+-----------+
| 884217ee-d402-4644-b421-931517025172 | usc01-az01-abs-octavia | True |
| 6af193ca-970d-4b78-9b0d-b90bbceced93 | usc01-az01-abs-stable1 | True |
| a45fe4b1-ac8b-40d8-b3c1-45b00c64b075 | usc01-az01-abs-stable2 | True |
| 5e44595b-012c-41b3-a842-b8c1637a4000 | usc01-az01-abs-arbor | True |
+--------------------------------------+------------------------+-----------+

ubuntu@jumphost:~/2021-04-12-TCS-Prod1PCB-215965$ openstack volume type show usc01-az01-abs-octavia
+--------------------+------------------------------------------------------------------------------------------+
| Field | Value |
+--------------------+------------------------------------------------------------------------------------------+
| access_project_ids | None |
| description | None |
| id | 884217ee-d402-4644-b421-931517025172 |
| is_public | True |
| name | usc01-az01-abs-octavia |
| properties | RESKEY:availability_zones='us-central-1-az01', volume_backend_name='cinder-ceph-stable2' |
| qos_specs_id | None |
+--------------------+------------------------------------------------------------------------------------------+

But when trying to create loadbalancers, I get this error:

2021-05-25 17:29:16.550 3666784 ERROR oslo_messaging.rpc.server taskflow.exceptions.WrappedFailure: WrappedFailure: [Failure: octavia.common.exceptions.ComputeBuildException: Failed to build compute instance due to: Multiattach volumes are only supported starting with compute API version 2.60. (HTTP 400) (Request-ID: req-16ce1668-84f6-4e88-84db-724cc3bc1538), Failure: octavia.common.exceptions.ComputeBuildException: Failed to build compute instance due to: Multiattach volumes are only supported starting with compute API version 2.60. (HTTP 400) (Request-ID: req-bdae919c-19c2-4ff5-b770-00a8d54a5f18)]

As y...

[Corey Bryant (corey.bryant)]

@Andre, can you do an 'openstack volume show' on the created volume? I wonder if that will have any hints.

[Corey Bryant (corey.bryant)]

^ That might be difficult to catch as octavia/compute/drivers/nova_driver.py deletes the volume if amphora creation fails.

[Corey Bryant (corey.bryant)]

If this is a test system you could comment out the volume deletion code in the exception handling code, then 'openstack volume show' to see what it looks like.

[Billy Olsen (billy-olsen)]

The problem is that you've specified the volume_type options in the controller_worker section of the config file. The following options for Cinder can be specified in the [cinder] config section (though the documentation does not clearly state this, the code does). Specifying them in the [controller_worker] will not yield the results you want. The volume is likely getting created with the default volume type - which I suspect has multiattach enabled.

The correct settings would have:

[controller_worker]
...
volume_driver = volume_cinder_driver
...

[cinder]
volume_size = 16
volume_type = <volume_type>
volume_create_retry_interval = 5
volume_create_timeout = 300
volume_create_max_retries = 5

[Billy Olsen (billy-olsen)]

Also, since you're using the default for all values except volume_type in the [cinder] block, you really only need to specify that one.

[Andre Ruiz (andre-ruiz)]

Ok, that worked well. Thank you!

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/charm-octavia/+/810567

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Nicholas Njihia <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/charm-octavia/+/810567

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/charm-octavia/+/811700

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Nicholas Njihia <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/charm-octavia/+/811700

[Felipe Reyes (freyes)]

The patch was left orphaned - https://review.opendev.org/c/openstack/charm-octavia/+/810567 - removing the assignee and setting the bug to 'triaged' to reflect the actual status.

[Peter Matulis (petermatulis)]

@Felipe - you created a bug task for the charm-guide. Can you give a summary of what's needed? From what I understand here, some options are in the process of being added to the octavia charm. Are you thinking of a special section that describes Cinder-based root volumes for amphorae instances?

[Felipe Reyes (freyes)]

On Thu, 2024-01-11 at 22:54 +0000, Peter Matulis wrote:
> @Felipe - you created a bug task for the charm-guide. Can you give a
> summary of what's needed? From what I understand here, some options are
> in the process of being added to the octavia charm. Are you thinking of
> a special section that describes Cinder-based root volumes for amphorae
> instances?
>

Just a release notes entry.