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Hello Dmitry,

Thanks for raising this question. I think the problem is deeper. There are
a lot of use-cases that are not covered by our CI like cleaning, adoption
etc...

The main problem is that we need to change ironic configuration to apply
specific use-case. Unfortunately tempest doesn't allow to change cloud
configuration during tests run.

Recently I've started working on PoC that should solve this problem [0].
The main idea is to have ability to change ironic configuration during
single gate job run, and launch the same tempest tests after each
configuration change.

We can't change other components configuration as it will require
reinstalling whole devstack, so launching flat network and multitenant
network scenarios is not possible in single job.

For example:

1. Setup devstack with agent_ssh wholedisk ipxe configuration

2. Run tempest tests

3. Update localrc to use agent_ssh localboot image

4. Unstack ironic component only. Not whole devstack.

5. Install/configure ironic component only

6. Run tempest tests

7. Repeat steps 3-6 with other Ironic-only configuration change.

Running step 4,5 takes near 2-3 minutes.

Below is an non-exhaustive list of configuration choices we could try to
mix-and-match in single tempest run to have a maximal overall code coverage
in a sibl:

   -

   cleaning enabled / disabled
   -

   using pxe_* drivers / agent_* drivers
   -

   using netboot / localboot
   - using partitioned / wholedisk images



[0] https://review.openstack.org/#/c/369021/




On Wed, Oct 12, 2016 at 3:01 PM, Dmitry Tantsur <dtantsur at redhat.com> wrote:

> Hi folks!
>
> I'd like to propose a plan on how to simultaneously extend the coverage of
> our jobs and reduce their number.
>
> Currently, we're running one instance per job. This was reasonable when
> the coreos-based IPA image was the default, but now with tinyipa we can run
> up to 7 instances (and actually do it in the grenade job). I suggest we use
> 6 fake bm nodes to make a single CI job cover many scenarios.
>
> The jobs will be grouped based on driver (pxe_ipmitool and agent_ipmitool)
> to be more in sync with how 3rd party CI does it. A special configuration
> option will be used to enable multi-instance testing to avoid breaking 3rd
> party CI systems that are not ready for it.
>
> To ensure coverage, we'll only leave a required number of nodes
> "available", and deploy all instances in parallel.
>
> In the end, we'll have these jobs on ironic:
> gate-tempest-ironic-pxe_ipmitool-tinyipa
> gate-tempest-ironic-agent_ipmitool-tinyipa
>
> Each job will cover the following scenarious:
> * partition images:
> ** with local boot:
> ** 1. msdos partition table and BIOS boot
> ** 2. GPT partition table and BIOS boot
> ** 3. GPT partition table and UEFI boot  <*>
> ** with netboot:
> ** 4. msdos partition table and BIOS boot <**>
> * whole disk images:
> * 5. with msdos partition table embedded and BIOS boot
> * 6. with GPT partition table embedded and UEFI boot  <*>
>
>  <*> - in the future, when we figure our UEFI testing
>  <**> - we're moving away from defaulting to netboot, hence only one
> scenario
>
> I suggest creating the jobs for Newton and Ocata, and starting with Xenial
> right away.
>
> Any comments, ideas and suggestions are welcome.
>
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