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Another solution.

Make NAS operations run as root by nas_secure_file_operations=False so that cinder volume files are made as root. With this option, NAS export directory doesn't need to be chmod 777.

https://bugs.launchpad.net/openstack-manuals/+bug/1385248

(edited message to add another option)

Another solution.

Make NAS operations run as root by nas_secure_file_operations=False so that cinder volume files are made created as root. With this option, NAS root.

If you want to use NFS export directory doesn't need to be chmod 777.in mode 755, following settings in cinder.conf for cinder-volume work.

nas_secure_file_operations=False
nas_option=False

https://blueprints.launchpad.net/cinder/+spec/secure-nfs

https://bugs.launchpad.net/openstack-manuals/+bug/1385248