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Hi Bob,

Thanks for your suggestions. My host machine(dom0) is running ubuntu14.04
and I installed xen hypervisor by running either "apt-get install
xen-hypervisor-4.4-amd64" or "apt-get install nova-compute-xen". I check
and do not find xencommons in /etc/init.d. Only xen and xendomains exist in
that dir. "apt-file search xencommons" does not return any package. No qemu
process is running in dom0.

I am not sure how to move forward. I will try to compile and install xen
from source and see whether I can get xencommons installed. If you have
some suggestions with this, please let me know. Thanks,


I will try to follow the following two links. In their installation, they
seem to have xencommons installed.
http://wiki.sebeka.k12.mn.us/virt:xen_4.4_14.04
http://pravinchavan.wordpress.com/2013/08/14/xen-hypervisor-setup/

-Xing




On Thu, Nov 6, 2014 at 6:09 AM, Bob Ball <bob.ball at citrix.com> wrote:

>  Hi Xing,
>
>
>
> It may be that the dom0 qemu helper process is not running.  It seems a
> very similar issue was tracked down to this on the thread at
> http://lists.xen.org/archives/html/xen-users/2014-05/msg00134.html
>
>
>
> Ian C pointed out that this helper process is normally started by the
> xencommons script.
>
>
>
> I hope this solves the issue.
>
>
>
> Thanks,
>
>
>
> Bob
>
>
>
> *From:* Xing Lin [mailto:linxingnku at gmail.com]
> *Sent:* 05 November 2014 21:38
> *To:* openstack at lists.openstack.org
> *Subject:* [Openstack] openstack + libvirt + xl for xen
>
>
>
> Hi,
>
>
>
> I am aware that Xen via libvirt is in the group C support but since I am
> not able to install xenserver iso at compute machines I have, I have to
> consider to use xen with libvirt. I have three nodes, each one running
> ubuntu 14.04. I follow the instruction to install juno in ubuntu 14.04 and
> it works (I can create instances from horizon) when I use kvm as the
> hypervisor at the compute node . However, if I switch to use xen as the
> hypervisor, it will fail to create instances. Note that I am able to create
> a xen guest with virt-install from command line, with the following
> command. So, I believe I am quite close to get libvirt + xl work for
> openstack. Any help will be highly appreciated! Thanks,
>
>
>
> "$ virt-install --connect=xen:/// --name u14.04.3 --ram 1024 --disk
> u14.04.3.img,size=4 --location
> http://ftp.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/ --network
> bridge=virbr0"
>
>
>
> libxl log when creating an instance, launched from horizon (failed).
>
> ------------------
>
> libxl: debug: libxl_create.c:1342:do_domain_create: ao 0x7f4e5c001890:
> create: how=(nil) callback=(nil) poller=0x7f4e5c000c50
>
> libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk
> vdev=sda spec.backend=qdisk
>
> libxl: debug: libxl_create.c:797:initiate_domain_create: running bootloader
>
> libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk
> vdev=(null) spec.backend=qdisk
>
> libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk
> vdev=xvda spec.backend=qdisk
>
> libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch
> w=0x7f4e5c001e20: deregister unregistered
>
> libxl: debug: libxl.c:2712:local_device_attach_cb: locally attaching qdisk
> /dev/xvda
>
> libxl: error: libxl_device.c:1224:libxl__wait_for_backend: Backend
> /local/domain/0/backend/qdisk/0/51712 not ready
>
> libxl: error: libxl_bootloader.c:405:bootloader_disk_attached_cb: failed
> to attach local disk for bootloader execution
>
> libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch
> w=0x7f4e5c001f48: deregister unregistered
>
> libxl: error: libxl_bootloader.c:276:bootloader_local_detached_cb: unable
> to detach locally attached disk
>
> libxl: error: libxl_create.c:1022:domcreate_rebuild_done: cannot
> (re-)build domain: -3
>
> libxl: debug: libxl_event.c:1591:libxl__ao_complete: ao 0x7f4e5c001890:
> complete, rc=-3
>
> libxl: debug: libxl_create.c:1356:do_domain_create: ao 0x7f4e5c001890:
> inprogress: poller=0x7f4e5c000c50, flags=ic
>
> libxl: debug: libxl_event.c:1563:libxl__ao__destroy: ao 0x7f4e5c001890:
> destroy
>
> xc: debug: hypercall buffer: total allocations:24 total releases:24
>
> xc: debug: hypercall buffer: current allocations:0 maximum allocations:2
>
> xc: debug: hypercall buffer: cache current size:2
>
> xc: debug: hypercall buffer: cache hits:20 misses:2 toobig:2
>
> libxl: debug: libxl_create.c:1342:do_domain_create: ao 0x7f4e540083e0:
> create: how=(nil) callback=(nil) poller=0x7f4e54007fb0
>
> ....
>
> --------------------
>
>
>
>
>
> libxl log when creating an instance with virt-install from command line
> (succeed).
>
> --------------------
>
> libxl: debug: libxl_create.c:1342:do_domain_create: ao 0x7f4e641b3ba0:
> create: how=(nil) callback=(nil) poller=0x7f4e640a94d0
>
> libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk
> vdev=xvda spec.backend=unknown
>
> libxl: debug: libxl_device.c:197:disk_try_backend: Disk vdev=xvda, backend
> phy unsuitable as phys path not a block device
>
> libxl: debug: libxl_device.c:286:libxl__device_disk_set_backend: Disk
> vdev=xvda, using backend qdisk
>
> libxl: debug: libxl_create.c:797:initiate_domain_create: running bootloader
>
> libxl: debug: libxl_bootloader.c:327:libxl__bootloader_run: no bootloader
> configured, using user supplied kernel
>
> libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch
> w=0x7f4e641cd2f8: deregister unregistered
>
> libxl: debug: libxl_numa.c:475:libxl__get_numa_candidate: New best NUMA
> placement candidate found: nr_nodes=1, nr_cpus=8, nr_vcpus=9,
> free_memkb=1293
>
> libxl: detail: libxl_dom.c:195:numa_place_domain: NUMA placement candidate
> with 1 nodes, 8 cpus and 1293 KB free selected
>
> domainbuilder: detail: xc_dom_allocate: cmdline="method=
> http://ftp.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/",
> features="(null)"
>
> libxl: debug: libxl_dom.c:357:libxl__build_pv: pv kernel mapped 0 path
> /var/lib/xen/virtinst-vmlinuz.mBNvPH
>
> domainbuilder: detail: xc_dom_kernel_file:
> filename="/var/lib/xen/virtinst-vmlinuz.mBNvPH"
>
> domainbuilder: detail: xc_dom_malloc_filemap    : 5643 kB
>
> domainbuilder: detail: xc_dom_ramdisk_file:
> filename="/var/lib/xen/virtinst-initrd.gz.Br5nZP"
>
> domainbuilder: detail: xc_dom_malloc_filemap    : 20758 kB
>
> domainbuilder: detail: xc_dom_boot_xen_init: ver 4.4, caps xen-3.0-x86_64
> xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
>
> domainbuilder: detail: xc_dom_parse_image: called
>
> domainbuilder: detail: xc_dom_find_loader: trying multiboot-binary loader
> ...
>
> domainbuilder: detail: loader probe failed
>
> domainbuilder: detail: xc_dom_find_loader: trying Linux bzImage loader ...
>
> domainbuilder: detail: xc_dom_malloc            : 18898 kB
>
> domainbuilder: detail: xc_dom_do_gunzip: unzip ok, 0x5761bf -> 0x12749b8
>
> domainbuilder: detail: loader probe OK
>
> ...
>
> ------------------
>
>
>
> -Xing
>
>
>
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