Hi, I'm trying to configure Cinder with NFS from a Fujitsu Eternus DX. Mounting the remote resource works fine, but when I try to create a volume, I get a "Permission denied" in the logs.
The Fujitsu Eternus DX (192.168.1.101) unit has a directory exported: $ showmount -e 192.168.1.101 Export list for 192.168.1.101: /mnt/nas/ 192.168.0.0/22 This directory is owned by uid=102 and gid=201. In the storage node, the configuration files are: - /etc/cinder/cinder.conf [DEFAULT] nfs_shares_config = /etc/cinder/nfsshares volume_driver = cinder.volume.drivers.nfs.NfsDriver [...] - /etc/cinder/nfsshares 192.168.1.101:/mnt/nas/ I have changed the uid and gid of the user cinder, in order to have the mentioned uid and gid: # id cinder uid=102(cinder) gid=201(cinder) groups=201(cinder),99(nobody) When I start the service, the remote resource is mounted: $ df -h Filesystem Size Used Avail Use% Mounted on [...] 192.168.1.101:/mnt/nas/ 59T 423G 58T 1% /var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51 # ls -l /var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/ drwxrwxr-x. 15 cinder cinder 1024 Jul 30 09:55 cust # ls -ln /var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/ drwxrwxr-x. 15 102 201 1024 Jul 30 09:55 cust But when I try to create a volume from another node (controller) with: $ cinder create --display-name myvol 1 I get the following message in the storage node (/var/log/cinder/volume.log): 2015-07-31 02:45:19.325 28370 ERROR oslo_messaging.rpc.dispatcher [req-047ed05d-cd56-410a-afa6-85a4db59728a 751edd7ef0494970bbeecaa5d2861450 f3680324d5124f8ca5937c310881cdb7 - - -] Exception during message handling: Unexpected error while running command. Command: None Exit code: - Stdout: u"Unexpected error while running command.\nCommand: sudo cinder-rootwrap /etc/cinder/rootwrap.conf truncate -s 1G /var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/volume-4ee83412-bf7d-4cd2-ae74-cffd5af3adc7\nExit code: 1\nStdout: u''\nStderr: '/bin/truncate: cannot open \\xe2\\x80\\x98/var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/volume-4ee83412-bf7d-4cd2-ae74-cffd5af3adc7\\xe2\\x80\\x99 for writing: Permission denied\\n'" Stderr: None As expected, if I try to manually run the same problematic command as root, I get the same error: # sudo cinder-rootwrap /etc/cinder/rootwrap.conf truncate -s 1G /var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/volume-4ee83412-bf7d-4cd2-ae74-cffd5af3adc7 /bin/truncate: cannot open ‘/var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/volume-4ee83412-bf7d-4cd2-ae74-cffd5af3adc7’ for writing: Permission denied But if I run it as cinder user, all is fine: [root@storage-node cinder]# su -c "truncate -s 1G /var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/volume-4ee83412-bf7d-4cd2-ae74-cffd5af3adc7" cinder [root@storage-node cinder]# ls -l /var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/volume-4ee83412-bf7d-4cd2-ae74-cffd5af3adc7 -rw-r--r--. 1 cinder cinder 1073741824 Jul 31 02:51 /var/lib/cinder/mnt/9ae799cf301b19940950ae49dd800c51/volume-4ee83412-bf7d-4cd2-ae74-cffd5af3adc7 Why Cinder is not able to write to the mounted directory? Should Cinder be forced to write to the mounted directory as cinder user? How? Francesc -- Francesc Pinyol Margalef http://www.francescpinyol.cat/
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