On 02/20/2012 09:58 AM, Cole Robinson wrote: > On 02/20/2012 11:21 AM, Jakub Mroziński wrote: >> Hi, >> virt-manager after saving guest config destroy symlink to this file and >> creates new file. How to reproduce: >> >> cd /etc/libvirt/qemu >> # mv openbsd.xml /mount/ >> # ln -s /mount/openbsd.xml >> # ls -l openbsd.xml >> lrwxrwxrwx 1 root root 49 Feb 20 17:09 openbsd.xml -> /mount/openbsd.xml >> # virt-manager Unsupported. /etc/libvirt must be a local directory on each host, and _must not be shared_ between machines. There are a few subdirectories under /etc/libvirt and /var/lib/libvirt that can be shared (in fact, http://libvirt.org/locking.html documents that /var/lib/libvirt/sanlock must be shared to be useful), but these are the exception, not the rule. >> >> Now we need to edit host openbsd in virt-manager then "Apply" changes and we got: >> # ls -l openbsd.xml >> -rw------- 1 root root 2076 Feb 20 17:13 openbsd.xml Correct - libvirt will not follow symlinks when saving internal configuration, but rewrites the file from scratch without preserving the symlink. And I don't think this is a bug, since we already explicitly document that files under /etc/libvirt are internal to libvirt, and must not be shared. Rather, it is probably an intentional side-effect of a recent libvirt change to atomically update internal .xml files (libvirt used to write over internal files in a non-atomic manner, which could corrupt domains if a power outage occurred at the wrong moment). >> >> I have network storage and move every configuration there. On host i want have >> only symlinks. I know that i can do workaround, but i dont want. If you want to store your configuration in shared storage, then the only supported method of doing that is to store the XML independently of /etc/libvirt. For example, you can 'virsh dumpxml $dom > /mount/$dom.xml' to save off the configuration to shared storage, and 'virsh define /mount/$dom.xml' to reload the shared configuration if you don't trust what might be in place locally. -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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