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:[email protected]] Sent: 05 November 2014 21:38 To: [email protected] 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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