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Thank you so much for these help! Your email has been very helpful to me!

1. @Clark Boylan  yes, when I use `export ARCH=arm64` instead of
`export ARCH=aarch64`， I successfully built ubuntu image.
2. @Jonathan Rosser  The doc[1] is so good and  helpful to me
3. @Dmitry Tantsur  Thank you for reminding me that I ignored this
debian image of arm64 before
4. @Jay Faulkner  hope "Shipping an ARM ramdisk image" goes well

As feedback only, no reply required

[1]: https://review.opendev.org/c/openstack/openstack-ansible-os_ironic/+/867547/11/doc/source/configure-ironic-multiarch.rst.

Jonathan Rosser <jonathan.rosser at rd.bbc.co.uk> 于2023年2月13日周一 09:19写道：
>
> I did this recently for aarch64 and I've written a documentation patch
> which is not merged yet but you can read it here
> https://review.opendev.org/c/openstack/openstack-ansible-os_ironic/+/867547/11/doc/source/configure-ironic-multiarch.rst.
>
> Part of that is specific to openstack-ansible but the sections about
> building images are generic.
>
> Jonathan.
>
> On 12/02/2023 14:15, 韩光宇 wrote:
> > Hello,
> >
> > I saw that we can get ramdisk image from tarballs.openstack.org[1] in
> > ironic doc[2].
> >
> > I would like to ask whether all the above are of amd64 architecture.
> > Where can I download the ramdisk image of aarch64 architecture？
> >
> > When I built aarch64 image locally, It's always failed.
> >
> > ```shell
> > # export ARCH=aarch64
> > # ironic-python-agent-builder fedora
> > ...
> > mount: /tmp/tmp.1yEQhatS1X/mnt: wrong fs type, bad option, bad
> > superblock on /dev/mapper/loop0p5, missing codepage or helper program,
> > or other error.
> >
> > # ironic-python-agent-builder centos
> > ...
> > 2023-02-12 14:15:02.361 | dib-run-parts Running
> > /tmp/in_target.d/pre-install.d/01-00-centos-python3
> > 2023-02-12 14:15:05.204 | CentOS Linux 8 - AppStream
> >      17  B/s |  38  B     00:02
> > 2023-02-12 14:15:05.209 | Error: Failed to download metadata for repo
> > 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
> >
> >
> > # ironic-python-agent-builder ubuntu
> > ...
> > 2023-02-12 14:15:31.623 | Fetching Base Image
> > 2023-02-12 14:15:31.657 |   % Total    % Received % Xferd  Average
> > Speed   Time    Time     Time  Current
> > 2023-02-12 14:15:31.657 |                                  Dload
> > Upload   Total   Spent    Left  Speed
> >    0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
> > 2023-02-12 14:15:32.388 | Server copy has not changed. Using locally
> > cached https://cloud-images.ubuntu.com/focal/current/SHA256SUMS
> > 2023-02-12 14:15:32.422 |   % Total    % Received % Xferd  Average
> > Speed   Time    Time     Time  Current
> > 2023-02-12 14:15:32.422 |                                  Dload
> > Upload   Total   Spent    Left  Speed
> > 100   286  100   286    0     0    418      0 --:--:-- --:--:-- --:--:--   418
> > 2023-02-12 14:15:33.110 | Server returned an unexpected response code. [404]
> > ```
> >
> > [1]: https://tarballs.opendev.org/openstack/ironic-python-agent/dib/files/
> > [2]: https://docs.openstack.org/ironic/latest/install/deploy-ramdisk.html
> >
> >
>