Hi everybody, I solved this issue myself but I would be sure this is a supported solution.
When kvm compute nodes start a a vm , they change the img file ownership. This behaviour can be modified modifying /etc/libvirt/qemu.conf file and setting: user = "root" # The group for QEMU processes run by the system instance. It can be # specified in a similar way to user. group = "root" # Whether libvirt should dynamically change file ownership # to match the configured user/group above. Defaults to 1. # Set to 0 to disable file ownership changes. dynamic_ownership = 0 I start qemu with uid root because the original image ownership is "cinder" and compute node does not know this user (but since the nfs file system is exported with no_root_squash , root is able to modify the image). I disabled dynamic_ownership because I do not want the owner of the image become root when the instance is shut-off. Regards Ignazio 2015-10-05 10:49 GMT+02:00 Ignazio Cassano <ignaziocass...@gmail.com>: > Hi everybody, I have an issue with cinder nfs driver. > > I launch a vm with a volume (volumeA). > I stop the vm. > I create a new volume (volumeB) and attach it to my vm. > I start again the vm. > I stop the vm. > Both volumeA and volumeB change their ownership from cinder to root. > This causes errors if I try to resize the volume (for example volumeB). > > Regards > Ignazio >
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