Hi! I believe that your're facing the very same problem I encountered... Like this:
http://askubuntu.com/questions/492830/how-to-integrate-libvirt-with-libxl-of-xen-4-4 Long story short, it doesn't work anymore (i.e., libvirt + xen 4.4 with xl - on Trusty)... :-/ Nevertheless, when with `KVM`, you can have much more instances per Compute Node, because of `KSM` (Kernel Same Page Merging). For example, in a compute node with 48G of RAM, `KSM` save-me about 22~28G... Maybe when with `Xen`, you can tell Nova to make use of Xen's "memory / maxmem" options in a very efficient manner... But I'm not sure if it is currently possible. The good when with `KVM+KSM` (Ubuntu metapackage `ubuntu-virt-server`), is that you just need to rise up your Nova's `ram_allocation_ratio` make make more use of it, simple and efficient. Someone please, correct-me if I'm wrong... :-) Best! Thiago On 5 November 2014 19:37, Xing Lin <[email protected]> wrote: > 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 > > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : [email protected] > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > _______________________________________________ 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