On 08/16/2013 06:59 PM, Daniel P. Berrange wrote:
On Sat, Aug 10, 2013 at 05:38:20PM +0530, Deepak C Shetty wrote:
Hi All, I am trying to do a hotplug of a disk from VDSM (which uses libvirt to get things done). I hit the below error "operation failed: open disk image file failed" comign from virDomainAttachDevice. 1) The qemu-img create cmd I use (inside vdsm) to create the file being hotplugged is
/usr/bin/qemu-img create -f qcow2 -F qcow2 -b /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399' (cwd /var/run/vdsm) So here you're using paths under /rhev or /var/run/vdsm.
Sorry, didn't get your Q here
2013-08-10 11:19:41.770+0000: 1103: debug : virStorageFileGetMetadataRecurse:939 : path=/home/dpkshetty/libSM_disk/localstoragedomain/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 This log suggests those paths are just symlinks into your home directory.
Yes, and these are setup by vdsm which sets the entire path with proper vdsm.kvm perms. id 'qemu' is also part of 'kvm' group.
What permissions are set on /home/dpkshetty ? By default $HOME permissions will not allow any other user to access files under it. So you would have to do 'chmod o+x /home/dpkshetty' to make this work
For instance... [root@vdsm_tsm_int_f19 vdsm]# ls -l /| grep home drwxr-xr-x. 3 root root 4096 Aug 8 19:53 home [root@vdsm_tsm_int_f19 vdsm]# ls -l /home | grep dpk drwx--x--x. 15 dpkshetty dpkshetty 4096 Aug 9 17:44 dpkshetty [root@vdsm_tsm_int_f19 vdsm]# ls -l /home/dpkshetty | grep libSM drwxr-xr-x. 16 dpkshetty dpkshetty 4096 Aug 9 18:36 libSM_disk If perms weren't rite, qemu says "permission denied"... but this is diff, it says "failed to open disk image" Atleast perms wise I feel i am fine here. [root@vdsm_tsm_int_f19 vdsm]# su - qemu -s /bin/bash -bash-4.2$ id uid=107(qemu) gid=107(qemu) groups=107(qemu),36(kvm) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 -bash-4.2$ qemu-img info /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399 image: /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399 file format: qcow2 virtual size: 3.8G (4096000000 bytes) disk size: 196K cluster_size: 65536 backing file: /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 backing file format: qcow2 -bash-4.2$ getenforce Permissive -bash-4.2$ ls -l /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 -r--r-----. 1 vdsm kvm 197120 Aug 16 12:42 /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 -bash-4.2$ qemu-img info /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 image: /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 file format: qcow2 virtual size: 3.8G (4096000000 bytes) disk size: 136K cluster_size: 65536
Daniel