Open Stack

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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