On 18 April 2018 at 15:10, Dan Smith <d...@danplanet.com> wrote: >> Thanks for the concern and fully under it , the major reason is >> cloud-init doesn't have a hook or plugin before it start to read >> config drive (ISO disk) z/VM is an old hypervisor and no way to do >> something like libvirt to define a ISO format disk in xml definition, >> instead, it can define disks in the defintion of virtual machine and >> let VM to decide its format. >> >> so we need a way to tell cloud-init where to find ISO file before >> cloud-init start but without AE, we can't handle that...some update on >> the spec here for further information >> https://review.openstack.org/#/c/562154/ > > The ISO format does not come from telling libvirt something about > it. The host creates and formats the image, adds the data, and then > attaches it to the instance. The latter part is the only step that > involves configuring libvirt to attach the image to the instance. The > rest is just stuff done by nova-compute (and the virt driver) on the > linux system it's running on. That's the same arrangement as your > driver, AFAICT. > > You're asking the system to hypervisor (or something running on it) to > grab the image from glance, pre-filled with data. This is no different, > except that the configdrive image comes from the system running the > compute service. I don't see how it's any different in actual hypervisor > mechanics, and thus feel like there _has_ to be a way to do this without > the AE magic agent.
Having briefly read the cloud-init snippet which was linked earlier in this thread, the requirement seems to be that the guest exposes the device as /dev/srX or /dev/cdX. So I guess in order to make this work: * You need to tell z/VM to expose the virtual disk as an optical disk * The z/VM kernel needs to call optical disks /dev/srX or /dev/cdX > 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. Matt -- Matthew Booth Red Hat OpenStack Engineer, Compute DFG Phone: +442070094448 (UK) __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
