Bug 962113 - Disable libguestfs block drivers which are not supported by RHEL 7 qemu + libvirt
Disable libguestfs block drivers which are not supported by RHEL 7 qemu + lib...
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libguestfs (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: Richard W.M. Jones
Virtualization Bugs
Depends On:
  Show dependency treegraph
Reported: 2013-05-11 17:33 EDT by Richard W.M. Jones
Modified: 2014-06-17 21:59 EDT (History)
5 users (show)

See Also:
Fixed In Version: libguestfs-1.22.5-2.el7
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2014-06-13 07:09:59 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Richard W.M. Jones 2013-05-11 17:33:27 EDT
Description of problem:

Upstream libguestfs now supports many of upstream qemu's block
drivers.  Currently that list is:


Some of these will not be supported in qemu.  Some are not
supported by libvirt (not even upstream libvirt).

We need to find out which will be supported in qemu + libvirt
in RHEL 7, and limit the devices to just those.  The others would
be removed from the documentation (and implementation?) in
libguestfs in RHEL 7.

Version-Release number of selected component (if applicable):

libguestfs in RHEL 7

Additional info:

enable nbd block driver [component = qemu-kvm]

There is no general bug or documentation I can find about
what qemu will eventually support.  But that information can
be found in the spec file.

My current understanding is this:

            qemu       |   libvirt
         upst.| RHEL7  |  upst.| RHEL7
file       Y      Y         Y      Y
ftp        Y      N         N      N
ftps       Y      N         N      N
gluster    Y                Y
http       Y      N         N      N
https      Y      N         N      N
iscsi      Y                [1]
nbd        Y   bug 875871   Y
rbd        Y                Y
sheepdog   Y                Y
ssh        Y                [2]
tftp       Y      N         N      N

[1] = Supposed to be supported, but I couldn't get it to work.
[2] = Patch posted upstream, but needs further work.
Comment 2 Richard W.M. Jones 2013-06-04 07:31:09 EDT
Dan can you help to fill in the table (comment 0)?
Comment 3 Daniel Berrange 2013-06-04 07:37:01 EDT
I don't believe we've made any decisions about the block device support list for RHEL-7 yet in libvirt or kvm.
Comment 4 Richard W.M. Jones 2013-07-11 05:54:24 EDT
ssh support seems unlikely before at least RHEL 7.1.  The reasons
are this needs further work in qemu & libvirt:

qemu: Support for more authentication types.

libvirt: Fix the ssh driver and get it upstream and test it
with libguestfs.

libguestfs: Some (minor) changes may be needed to make the
libvirt backend fully functional with ssh.
Comment 5 Richard W.M. Jones 2013-07-29 10:44:18 EDT
This RHEL-7-only commit was added:

Comment 7 bfan 2013-12-02 00:08:05 EST
Verified with libguestfs-1.22.6-16.el7.x86_64

1. test nbd driver
qemu-nbd -v -t RHEL-Server-6.4-64-hvm.raw &
virt-inspector -a nbd://

2. test file driver
virt-inspector -a file:///path/RHEL-Server-6.4-64-hvm.raw

All works well, so change the status to verified
Comment 8 Ludek Smid 2014-06-13 07:09:59 EDT
This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.

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