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Thanks a lot for your sharing, that's good info, just curious why [1] need
zip and base64 encode if my understand is correct
I was told nova need format should be pure vfat or iso9660, I assume it's
because actually the config drive itself is making by iso by default
then wrap a zip/base64 format ... thanks

[1]
https://github.com/openstack/nova/blob/324899c621ee02d877122ba3412712ebb92831f2/nova/virt/ironic/driver.py#L977

Best Regards!

Kevin (Chen) Ji 纪 晨

Engineer, zVM Development, CSTL
Notes: Chen CH Ji/China/IBM at IBMCN   Internet: jichenjc at cn.ibm.com
Phone: +86-10-82451493
Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District,
Beijing 100193, PRC



From:	Jim Rollenhagen <jim at jimrollenhagen.com>
To:	"OpenStack Development Mailing List (not for usage questions)"
            <openstack-dev at lists.openstack.org>
Date:	04/19/2018 12:02 AM
Subject:	Re: [openstack-dev] [Nova] z/VM introducing a new config
            driveformat



On Wed, Apr 18, 2018 at 10:56 AM, Matthew Booth <mbooth at redhat.com> wrote:

  > I agree with Mikal that needing more agent behavior than cloud-init
  does
  > a disservice to the users.
  >
  > I feel like we get a lot of "but no, my hypervisor is special!"
  > reasoning when people go to add a driver to nova. So far, I think
  > they're a lot more similar than people think. Ironic is the weirdest
  one
  > we have (IMHO and no offense to the ironic folks) and it can support
  > configdrive properly.

  I was going to ask this. Even if the contents of the disk can't be
  transferred in advance... how does ironic do this? There must be a
  way.

I'm not sure if this is a rhetorical question, so I'll just answer it. :)
We basically build the configdrive in nova-compute, then gzip and base64
it, and send it to ironic with the deploy request. On the ironic side, we
unpack it and write it to the end of the boot disk.

https://github.com/openstack/nova/blob/324899c621ee02d877122ba3412712ebb92831f2/nova/virt/ironic/driver.py#L952-L985


// jim
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