[Libguestfs] Re: virt-{X} command support Ceph RBD keyring authentication
On Fri, Aug 09, 2024 at 11:59:45AM -0000, brownie4597(a)gmail.com wrote:
First, i'm appreciate to your hard work.
i have a question for using virt-{X} commands (virt-customize, virt-cat and so on...).
Is there any way to connect RBD storage including keyring for using virt-X commands?
it seems possible with `guestfish add`, but i could not find out with -a option.
https://libguestfs.org/guestfish.1.html#adding-remote-storage
(ex. -a rbd://example.com[:port]/pool/disk)
rbd://... URIs should be supported by virt-customize. However I kind
of doubt that anyone has ever tested them. Also this doesn't pass the
secret along. You could try it anyhow:
virt-customize -a rbd://... --hostname ...
If libvirt knows about the guest, then an alternative is to use the -d
option with the libvirt guest name. Again in theory this should just
set up the disks (with the secret?), although I doubt anyone tried it.
i tried hard, but switching virt-X commands to `guestfish` is so
difficult.
- like `virt-customize`
> virt-customize --hostname -> guestfish add pool/image protocol:rbd username:admin
server:example.com:1234 secret:{keyring} : run : mount ~~~ : write /etc/hostname ~~~)
If there is a way, I would appreciate it if you could let me know.
Thanks
One thing that might help is to run virt-customize with the -x option
(but not -v), which will print the libguestfs calls being made.
You'll see that virt-customize high level commands translate in some
cases into a lot of low level calls. But some virt-customize commands
are actually quite trivial.
For example, setting a hostname on a test image:
$ virt-builder fedora-39
$ virt-customize -a fedora-39.img -x --hostname foobar
...
libguestfs: trace: write "/etc/hostname" "foobar\x0a"
...
The key guestfish command here is just the 'write'. So
the guestfish equivalent would be:
$ guestfish
<fs> add pool/image protocol:rbd username:admin
server:example.com:1234 secret:{keyring}
<fs> run
<fs> [mount up the disks]
<fs> write "/etc/hostname" "foobar\n"
<fs> exit
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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