Michal Privoznik wrote: > On 18.03.2014 02:20, Eric Blake wrote: >> On 03/17/2014 05:46 PM, Jim Fehlig wrote: >>> I received a report about an odd use case of /etc/libvirt/<driver>/ >>> config files, and would like to hear some opinions about it. The user >>> "preps" a host by mounting a remote fs containing VM images and config, >>> creates links in /etc/libvirt/<driver>/dom.xml to >>> /mnt-point/whatever/dom.xml, and starts libvirtd. All is well until >>> there is a need to modify the VM config (e.g. virsh setmaxmem ... >>> --config), at which point libvirt replaces the link with a file >>> containing the new config, instead of updating the contents of the >>> linked file. >> >> Not a valid use case. Instead, the user should 'virsh define' (or >> otherwise use the libvirt APIs). >> >>> >>> I suppose I've always considered the contents of /etc/libvirt/<driver>/ >>> private to libvirt, with a "modify at your own risk" warning, ignoring >>> that it is user configuration in /etc. What are the guidelines for >>> modifying the contents of these directories? Would the above be >>> considered valid use? >> >> Point your user to: >> http://wiki.libvirt.org/page/FAQ#Where_are_VM_config_files_stored.3F_How_do_I_edit_a_VM.27s_XML_config.3F >> >> >> and hopefully they will quit abusing files under /etc, as that usage is >> explicitly unsupported. We only support modifications made through >> libvirt APIs. > > But they are modifying XML through libvirt APIs (virsh setmaxmem ...). > However, if they are sharing XML over several hosts, it won't work > (this really is unsupported). You don't want libvirtd to be polling > for XML definition file changes made from outside and then re-parsing > the file.
Yes, I would *not* want that behavior :). > > What they could do, is to symlink the <driver> directory instead of > individual XML files there. Or mount the <driver> directory with their config, or virDomainDefineXML as Eric suggests. I guess the question was more about what users are allowed to do with files in this directory. I've always claimed "not much". Thanks to all for confirming that. Regards, Jim -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
