[openstack-dev] [Fuel] Fuel Plugins, First look; Whats Next?

Evgeniy L eli at mirantis.com
Mon Nov 24 12:40:57 UTC 2014

Hi Andrew,

Comments inline.
Also could you please provide a link on OpenStack upgrade feature?
It's not clear why do you need it as a plugin and how you are going
to deliver this feature.

On Sat, Nov 22, 2014 at 4:23 AM, Andrew Woodward <xarses at gmail.com> wrote:

> So as part of the pumphouse integration, I've started poking around
> the Plugin Arch implementation as an attempt to plug it into the fuel
> master.
> This would require that the plugin install a container, and some
> scripts into the master node.
> First look:
> I've looked over the fuel plugins spec [1] and see that the install
> script was removed from rev 15 ->16 (line 134) This creates problems
> do to the need of installing the container, and scripts so I've
> created a bug [2] for this so that we can allow for an install script
> to be executed prior to HCF for 6.0.

Yes, it was removed, but nothing stops you from creating the install
script and putting it in tarball, you don't need any changes in the
current implementation.

The reasons why it was done this way, see in separate mailing thread [1].


> Looking into the implementation of the install routine [3] to
> implement [2], I see that the fuelclient is extracting the tar blindly
> (more on that at #3) on the executor system that fuelclient is being
> executed from. Problems with this include 1) the fuelclient may not
> root be privileged (like in Mirantis OpenStack Express) 2) the
> fuelclient may not be running on the same system as nailgun 3) we are
> just calling .extractall on the tarball, this means that we haven't
> done any validation on the files coming out of the tarball. We need to
> validate that 3.a) the tarball was actually encoded with the right
> base path 3.b) that the tasks.yaml file is validated and all the noted
> scripts are found. Really, the install of the plugin should be handled
> by the nailgun side to help with 1,2.

1. if you have custom installation you have to provide custom permissions
    for /var/www/nailgun/plugins directory
2. you are absolutely right, see the thread from above why we decided to add
    this feature even if it was a wrong decision from architecture point of
3. "haven't done any validation" - not exactly, validation is done on plugin
    building stage, also we have simple validation on plugin installation
stage on
    Nailgun side (that data are consistent from nailgun point of view).
There are
    several reasons why it was done mainly on fuel-plugin-builder side:
      a. plugin is validated before it's installed (it dramatically
simplifies development)
      b. also you can check that plugin is valid without plugin building,
          use 'fpb --check fuel_plugin_name' parameter
      c. faster fixes delivery, if there is a bug in validation (we had
several of them
          during the development in fuel-plugin-builder), we cannot just
release new
          version of fuel, but we can do it with fuel-plugin-builder, we
had 2 releases [1].
          For more complicated structures you will have bugs in validation
for sure.
      d. if we decide to support validations on both sides, we will come up
with a lot of bugs
          which are related to desynchronization of validators between
Nailgun and fuel-plugin-builder


> Whats next?
> There are many parts of PA that need to be extended, I think that
> these are the ones that we must tackle next to cover the most cases
> a) plugin packaging: it appears that non of the "core plugins" (those
> in fuel-plugins) are bundled into the iso.
> b) plugin signing: we cant have "core plugins" with out some method of
> testing, certifying, and signing them so that we can know that they
> are trusted.
> with the help of granular roles:
> c) the ability to replace or add new granular roles
> d) the ability to add or modify real roles
> with the help of advanced networks:
> e) add new network roles
> At some point soon, we also need to discuss making it easier to find a
> catalog of modules and pull them from it, but this is less important
> than the above
> [1]
> https://review.openstack.org/#/c/125608/15..16/specs/6.0/cinder-neutron-plugins-in-fuel.rst
> [2] https://bugs.launchpad.net/fuel/+bug/1395228
> [3]
> https://github.com/stackforge/fuel-web/blob/master/fuelclient/fuelclient/objects/plugins.py#L49
> --
> Andrew
> Mirantis
> Ceph community
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> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
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