August 2017 - Users - libvirt List Archives

[libvirt-users] bridge / ubuntu / no arp reply
by François Chenais 15 Oct '26

15 Oct '26

Hello I'm trying to setup a bridged guest on an ubuntu 13.10 but it doesn't work. (Everything is ok with NAT) Network sniffing shows that arp replies don't come back to the guest. Test 1 ------ Guest : ping host_bridge_ip (ok) Test 2 ------ Guest: ping other_lan_host (KO) other_lan_host - receives arp who-is request - sends arp reply - arp -a shows the guest macaddr => Guest doesn't receive reply Test 3 ------ other_lan_host ping the Guest (KO) - arp -a shows "incomplete" addr - Guest receives nothing On Host ------- network tcpdump on bridge or vnet interfaces shows request but no reply ... Thanks in advance for help or ideas François

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[libvirt-users] ceph rbd pool and libvirt manageability (virt-install)
by Jelle de Jong 28 Aug '18

28 Aug '18

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everybody, I created a rbd pool and activated it, but I can't seem to create volumes in it with virsh or virt-install? # virsh pool-dumpxml myrbdpool <pool type='rbd'> <name>myrbdpool</name> <uuid>2d786f7a-2df3-4d79-ae60-1535bcf1c6b5</uuid> <capacity unit='bytes'>6997998301184</capacity> <allocation unit='bytes'>10309227031</allocation> <available unit='bytes'>6977204658176</available> <source> <host name='ceph01.powercraft.nl' port='6789'/> <host name='ceph02.powercraft.nl' port='6789'/> <host name='ceph03.powercraft.nl' port='6789'/> <name>libvirt-pool</name> <auth type='ceph' username='libvirt'> <secret uuid='029a334e-ed57-4293-bb99-ffafa8867122'/> </auth> </source> </pool> # virt-install --version 1.0.1 # virsh --version 1.2.9 I ended using virsh edit ceph-test.powercraft.nl and making creating the disk manually. <disk type='network' device='disk'> <auth username='libvirt'> <secret type='ceph' uuid='029a334e-ed57-4293-bb99-ffafa8867122'/> </auth> <source protocol='rbd' name='libvirt-pool/kvm01-storage'> <host name='ceph01.powercraft.nl' port='6789'/> <host name='ceph02.powercraft.nl' port='6789'/> <host name='ceph03.powercraft.nl' port='6789'/> </source> <target dev='vdc' bus='virtio'/> </disk> I use virt-install a lot to define, import and undefine domains, how can I use virt-install to manage my rdb disks? Kind regards, Jelle de Jong -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iJwEAQECAAYFAlV1xlQACgkQ1WclBW9j5HkbPQP+PjNrzvlqysslOp2Yk7wH4Mxy 2sh2dn96G0KOAHEeEn3BN6IWlnD1TADZbHdpTtMwkdv48Xwn0sP1s+3QDM4pb3gP n+z+dVxS8FouDIy/eiso3IBCj3g4TWbEX8ZHqs3jKqe0lZgAXBzB9xYSUowcEBrZ ddkPbr8p8ozWyOG+9V8= =lkK7 -----END PGP SIGNATURE-----

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[libvirt-users] virRandomBits - not very random
by Brian Rak 01 Jun '18

01 Jun '18

I just ran into an issue where I had about 30 guests get duplicate mac addresses assigned. These were scattered across 30 different machines. Some debugging revealed that: 1) All the host machines were restarted within a couple seconds of each other 2) All the host machines had fairly similar libvirtd pids (within ~100 PIDs of each other) 3) Libvirt seeds the RNG using 'time(NULL) ^ getpid()' This perfectly explains why I saw so many duplicate mac addresses. Why is the RNG seed such a predictable value? Surely there has to be a better source of a random seed then the timestamp and the pid? The PID seems to me to be a very bad source of any randomness. I just ran a test across 60 of our hosts. 43 of them shared their PID with at least one other machine.

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[libvirt-users] How to configure dnsmasq using libvirt?
by Don Zickus 18 Sep '17

18 Sep '17

Hi, I am working on a project, beaker, where they use anisble scripts to setup an environment with 4 virtual machines. One acts as a server to the other 3. We noticed after the network was setup, the domainname is not properly reported with using the 'hostname' command. We believe that dnsmasq was not correctly configured. Is there a recommended way to setup dnsmasq using libvirt and ansible? Thanks! Cheers, Don ps - please cc me as I am not subscribed to the list

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[libvirt-users] network configuration for guest specific dns-servers
by David Ayers 13 Sep '17

13 Sep '17

Hello, similar to how one can configure guest specific IP addresses via mac addresses: <ip address="192.168.122.1" netmask="255.255.255.0" localPtr="yes"> <dhcp> <range start="192.168.122.100" end="192.168.122.254"/> <host mac="00:16:3e:77:e2:ed" name="foo.example.com" ip="192.168.122.10"/> <host mac="00:16:3e:3e:a9:1a" name="bar.example.com" ip="192.168.122.11"/> </dhcp> </ip> We would like to configure guest specific dns-servers as would be done with the --dhcp-option of dnsmasq. I was expecting to be able to do something like: <host mac="00:16:3e:77:e2:ed" name="foo.example.com" ip="192.168.122.10" dhcp-option="dns-server,127.0.0.1" /> but it seems that this isn't the correct approach, as virsh net-edit default removes that attribute definition. Could someone point me to the correct documentation? Thank you! David Ayers -- David Ayers - Team Austria Free Software Foundation Europe (FSFE) [] (http://www.fsfe.org) Join the Fellowship of FSFE! [][][] (https://fsfe.org/join) Your donation powers our work! || (http://fsfe.org/donate)

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[libvirt-users] external snapshot is missing object secrets
by Markus Schade 13 Sep '17

13 Sep '17

Hello, I have virtual machines running with a ceph storage backend. When creating an external qcow2 snapshot with a libvirt version without support for the new object secret passing, the backing file info would list the ceph secret in plain,e.g. # virsh snapshot-create-as vm-123 --no-metadata --disk-only --diskspec sda,file=/var/lib/libvirt/qemu/snapshot/vm-123-wrapper.qcow2 # qemu-img info /var/lib/libvirt/qemu/snapshot/vm-123-wrapper.qcow2 ... backing file: rbd:vms_pool0/disk-123:id=libvirt:key=SECRET:auth_supported=cephx\;none:mon_host=192.168.1.1\:6789\;192.168.1.11\:6789\;192.168.1.21\:6789 While this is problematic from a security perspective (and one of the reasons for the new method), it enabled starting the virtual machine again in case it died or got powered off. With the newer libvirt object secret passing the backing file of the qcow image only references the secret id. # qemu-img info /var/lib/libvirt/qemu/snapshot/vm-123-wrapper.qcow2 ... backing file: json:{"driver": "raw", "file": {"password-secret": "scsi0-0-0-0-secret0", "pool": "vms_pool", "image": "disk-123", "driver": "rbd", "user": "libvirt", "=keyvalue-pairs": "[\"auth_supported\", \"cephx;none\", \"mon_host\", \"192.168.1.1:6789;192.168.1.11:6789;192.168.1.21:6789\"]"}} This is fine as long as the virtual machine is running and with qemu-2.10 it is even possible to block-commit this external snapshot (Yeah!). However, should the VM die or be powered off, it is now longer possible to start the domain or at least recover the data: Could not open backing file: No secret with id 'scsi0-0-0-0-secret0' I guess this problems happens with any disk type that is accessed with object secrets, which is why I would consider this a bug. The question is, should/can this be fixed in libvirt or qemu? I think libvirt should create the snapshot file with the object secret stored in a persistent file (and reference this file in the backing file definition) Best regards, Markus

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[libvirt-users] snapshot anomaly
by Doug Hughes 30 Aug '17

30 Aug '17

I'm not sure how this snapshot got created, but, I cannot delete it, and its presence prevents me from creating other snapshots. I don't know if it was created by a command gone amok or something else. # virsh snapshot-list serv1r2 Name Creation Time State ------------------------------------------------------------ snap 2017-01-30 17:01:11 -0500 shutoff # virsh snapshot-delete serv1r2 snap --disk-only error: command 'snapshot-delete' doesn't support option --disk-only # virsh snapshot-dumpxml serv1r2 snap <domainsnapshot> <name>snap</name> <state>shutoff</state> <creationTime>1485813671</creationTime> <memory snapshot='no'/> <disks> <disk name='vda' snapshot='external' type='file'> <driver type='qcow2'/> <source file='/*var/lib/libvirt/images/serv1r2-savesnap.qcow2'/*> </disk> <disk name='fda' snapshot='no'/> <disk name='hda' snapshot='no'/> </disks> # ls -l /var/lib/libvirt/images/serv1r2-savesnap.qcow2 ls: cannot access /var/lib/libvirt/images/serv1r2-savesnap.qcow2: No such file or directory # virsh snapshot-create-as --domain serv1r2 snap --diskspec vda,file=/var/lib/libvirt/flashimages/serv1r2-snap.qcow2 --disk-only --atomic --no-metadata --quiesce error: internal error: unexpected domain snapshot snap already exists # virsh snapshot-revert serv1r2 snap error: unsupported configuration: revert to external snapshot not supported yet Any idea for breaking out of this box? -- Doug Hughes Keystone NAP Fairless Hills, PA 1.844.KEYBLOCK (539.2562)

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[libvirt-users] duplicated notifications for suspend and resume
by Naud, AntoineX 28 Aug '17

28 Aug '17

Hello, I am using domain event notifications from libvirt-event API in my application and it seems to work fine, except for 'suspend' and 'resume' events where I keep receiving duplicated notifications. Similarly, the example provided with libvirt (in examples/object-events/event-test) also produces twice as much notifications for 'suspend' and 'resume' than for other events. Here is the sequence of virsh commands and the output of event-test: Virsh start Fed25 Virsh suspend Fed25 Virsh resume Fed25 Virsh shutdown Fed25 [~/libvirt-3.4.0/examples/object-events] ./event-test qemu:///system Registering event callbacks myNodeDeviceEventCallback EVENT: Node device net_vnet0_fe_54_00_a0_ba_61 Created 0 myDomainEventCallback1 EVENT: Domain Fed25(1) Resumed Unpaused myDomainEventCallback2 EVENT: Domain Fed25(1) Resumed Unpaused myDomainEventCallback1 EVENT: Domain Fed25(1) Started Booted myDomainEventCallback2 EVENT: Domain Fed25(1) Started Booted myDomainEventCallback1 EVENT: Domain Fed25(1) Suspended Paused myDomainEventCallback2 EVENT: Domain Fed25(1) Suspended Paused myDomainEventCallback1 EVENT: Domain Fed25(1) Suspended Paused myDomainEventCallback2 EVENT: Domain Fed25(1) Suspended Paused myDomainEventCallback1 EVENT: Domain Fed25(1) Resumed Unpaused myDomainEventCallback2 EVENT: Domain Fed25(1) Resumed Unpaused myDomainEventCallback1 EVENT: Domain Fed25(1) Resumed Unpaused myDomainEventCallback2 EVENT: Domain Fed25(1) Resumed Unpaused myDomainEventCallback1 EVENT: Domain Fed25(1) Shutdown Finished myDomainEventCallback2 EVENT: Domain Fed25(1) Shutdown Finished myNodeDeviceEventCallback EVENT: Node device net_vnet0_fe_54_00_a0_ba_61 Deleted 0 Note that the 2 lines printed for each event are ok since 2 callbacks are registered in the example. Has anybody else faced this issue? I am using libvirt-3.6.0 on Ubuntu 16.04. Best regards, Antoine -------------------------------------------------------------- Intel Research and Development Ireland Limited Registered in Ireland Registered Office: Collinstown Industrial Park, Leixlip, County Kildare Registered Number: 308263 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.

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[libvirt-users] libvirt event
by llilulu 28 Aug '17

28 Aug '17

libvirt version: 3.4.0 When use libvirt event in program, if I create more than one thread loop call virEventRunDefaultImp(), Is this invocation correct. If correct ,what happen when event occur.is many thread process event? If I invocation virEventRegisterDefault before any hypervisor connect, and invocation virEventRunDefaultImp.Then I connect a hypervisor(qemu) and register some event on this connection. I connect another hypervisor(lxc), before lxc connection, I reinvocation virEventRegisterDefault and virEventRunDefaultImp, Is this operate correct?What happen after that? Thanks

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[libvirt-users] dump in virEventPollRunOnce
by llilulu 28 Aug '17

28 Aug '17

libvirt version: 3.4.0 architecture: x86_64 ubuntu16.04-server hypervisor: kvm,qemu My program use libvirt event , the program is a module(.so) file in cloud application, when unload the module, program will dump in virEventPoolRunOnce call. program frame virInitialize virEventAddTimeOut virEventRunDefaultImpl virConnectXXX virConnectDomainEventRegisterAny ... virConnectDomainEventDeregisterAny ... when unload the module will dump , the gdb bt commad output is [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `/usr/local/lssa/bin/lssa -f'. Program terminated with signal SIGSEGV, Segmentation fault. ---Type <return> to continue, or q <return> to quit--- #0 0x00007f9a3e9fc2f2 in ?? () [Current thread is 1 (Thread 0x7f9a39349700 (LWP 2897))] (gdb) bt #0 0x00007f9a3e9fc2f2 in ?? () #1 0x00007f9a3e1728bd in virEventPollRunOnce () from /usr/lib/libvirt.so.0 #2 0x00007f9a3e171391 in virEventRunDefaultImpl () from /usr/lib/libvirt.so.0 #3 0x00007f9a3e9fbc16 in ?? () #4 0x0000000000000000 in ?? () (gdb) Thanks

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