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chardev: opening backend "file" failed: Permission denied

asked 2013-06-21 12:05:26 -0500

Sam W. gravatar image

updated 2013-06-21 13:11:25 -0500

Hi all,

I had my cluster working on a single node. glance images and nova instances are stored on an nfs mount.

I added two more nodes and enabled live-migration.

Now when I try to start to an instance I get:

nova-scheduler.log - libvirtError: internal error Process exited while reading console log output: chardev: opening backend "file" failed: Permission denied

Here is the traceback from nova-compute.log:

I have seen references online to this error, but no solutions. Does anyone know what may be causing and better yet, how to fix it?

Thanks, Sam

=== edit ===

Here is some more information. I am using Ubuntu 12.04 LTS, I have turned off apparmor.

Here is my export/mount:

export: /data/os-grizzly,no_root_squash,no_subtree_check)

mount: dedup:/big_pool/os-grizzly on /os-grizzly type nfs (rw,noatime,nolock,tcp,bg,intr,hard,addr=

root@test1:/# find /os-grizzly -type d | xargs ls -l -d
drwxr-xr-x 4 root   root   4 Jun 21 13:39 /os-grizzly
drwxr-xr-x 3 glance glance 3 Jun  3 10:25 /os-grizzly/glance
drwxr-x--- 2 glance glance 4 Jun 19 15:41 /os-grizzly/glance/images
drwxr-xr-x 3 nova   nova   3 Jun 21 13:39 /os-grizzly/nova
drwxr-xr-x 4 nova   nova   5 Jun 21 13:13 /os-grizzly/nova/instances
drwxr-xr-x 2 nova   nova   4 Jun 19 15:42 /os-grizzly/nova/instances/_base
drwxr-xr-x 2 nova   nova   6 Jun 19 15:42 /os-grizzly/nova/instances/locks

root@test1:/# grep -RE "^[^#]" /etc/libvirt/*.conf
/etc/libvirt/libvirtd.conf:listen_tls = 0
/etc/libvirt/libvirtd.conf:listen_tcp = 1
/etc/libvirt/libvirtd.conf:unix_sock_group = "libvirtd"
/etc/libvirt/libvirtd.conf:unix_sock_rw_perms = "0770"
/etc/libvirt/libvirtd.conf:auth_unix_ro = "none"
/etc/libvirt/libvirtd.conf:auth_unix_rw = "none"
/etc/libvirt/libvirtd.conf:auth_tcp = "none"
/etc/libvirt/qemu.conf:dynamic_ownership = 0
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answered 2013-06-21 14:45:09 -0500

Sam W. gravatar image

When all else fails, reboot.

That seemed to fix that error. Onto the next one.

Thanks all that took the time to read this post.

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P.S. I can not answer my own question because I do not have enough points.

Sam W. gravatar imageSam W. ( 2013-06-21 14:45:48 -0500 )edit

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Asked: 2013-06-21 12:05:26 -0500

Seen: 753 times

Last updated: Jun 21 '13