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Xen: libvirt.libvirtError: An error occurred, but the cause is unknown
by Mathieu Tarral 07 Apr '21

07 Apr '21

Hi, I'm facing a strange issue with libvirt and the Xen driver. Whenever I try to define or start a domain, I always get this error: "libvirt.libvirtError: An error occurred, but the cause is unknown" (in Python virt-manager interface) Which is not very helpful. Trying to use virsh directly leads to the same error message: virsh # start win10_xen error: Failed to start domain win10_xen error: An error occurred, but the cause is unknown I checked /var/log/libvirt/libxl/libxl-driver.log, but the log file is empty. However, using the xl toolstack directly to start a new domain works fine, so the issue doesn't seem to come from Xen. My environment: - Ubuntu 20.04 LTS - xen-hypervisor-4.11-amd64 (4.11.3+24-g14b62ab3e5-1ubuntu2) - libvirt0 (6.0.0-0ubuntu8.8) I really like libvirt and virt-manager to manage my VMs. Any clue how I could dig deeper and find the root cause ? Thanks.

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Live migration with change to setmaxmem
by Dariusz Smigiel 07 Apr '21

07 Apr '21

Hi Team, I need to migrate beefy instance between two different hosts which is running out of resources. I was wondering, if there is a way to change maximum memory value during live migration, without shutting down the instance. Thanks, Dariusz

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Re: Regarding location of Libvirt library
by Andrea Bolognani 06 Apr '21

06 Apr '21

[please keep replies on-list] On Mon, 2021-04-05 at 12:03 +0530, shafnamol N wrote: > Hi, > I have build libvirt in the following method: > $ meson build -Dsystem=true > $ ninja -C build > When i tried to get the information via > > $pkg-config --cflags --libs libvirt > > it doesnt show anything. > > But I tried > $ninja -C build install > > and then > $pkg-config --cflags --libs libvirt > It shows like: > libvirt-7.1.0]# pkg-config --cflags --libs libvirt > -lvirt This is expected: pkg-config can't find the libvirt.pc file until you've installed it :) > But the problem is when i tried to get the status of libvirt > > # systemctl status libvirtd > ● libvirtd.service > Loaded: not-found (Reason: Unit libvirtd.service not found.) > Active: failed (Result: exit-code) > > I tried with > # systemctl daemon-reload > But the problem persists.. > what will be the problem... What does running $ ls /usr/lib/systemd/system/*virt* output? What does the Miscellaneous ... Init script: XXX entry look like in the summary that's displayed when you run Meson? What OS are you using? -- Andrea Bolognani / Red Hat / Virtualization

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Virtual Network API for QEMU
by Radek Simko 03 Apr '21

03 Apr '21

Hi, According to this support matrix https://libvirt.org/hvsupport.html#virNetworkDriver there is no support for any APIs other than hypervisor ones for qemu. For example virConnectNumOfNetworks is not supported. Is there any particular reason this is not supported? Has any development in that area been attempted in the past? Would contributions adding support be welcomed? Thanks, Radek Simko

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GlusterFS libgfapi with TLS
by lejeczek 01 Apr '21

01 Apr '21

Hi guys. I have KVM guests stored on glusterFS volume and I recently added TLS encryption to Gluster. What changes, tweaks are required at libvirtd/qemu's end? many thanks, L.

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Regarding location of Libvirt library
by shafnamol N 31 Mar '21

31 Mar '21

Hi, I have installed Libvirt 7.1.0. I configured and built libvirt based on instructions from https://libvirt.org/compiling.html. Now I developed a client program to create a VM using an XML file.As the API for it is *virDomainCreateXML,* called this API by passing XML file .It shows the following error. undefined reference to `virDomainCreateXML'. I included the header files containing the said API declaration.But need to include the library also. My question is where do the libvirt library located after building it. Thanks for the help in advance.

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virsh dommemstat doesn't update its information
by Lentes, Bernd 29 Mar '21

29 Mar '21

Hi, i'm playing a bit around with my domains and the balloon driver. To get information about ballooning i use virsh dommemstat. But i only get very few information: virsh # dommemstat vm_idcc_devel actual 1044480 last_update 0 rss 1030144 Also configuring "dommemstat --domain vm_idcc_devel --period 5 --live" or "dommemstat --domain vm_idcc_devel --period 5 --current" does neither update nor extend the information. In vm_idcc_devel virtio_balloon is loaded: idcc-devel:~ # lsmod|grep balloon virtio_balloon 22788 0 Guest OS is SLES 10 SP4. Is that too old ? Host OS is SLES 12 SP5. There are other domains in which the information is updated. Here is the config from vm_idcc_devel: virsh # dumpxml vm_idcc_devel <domain type='kvm' id='7'> <name>vm_idcc_devel</name> <uuid>4993009b-42ff-45d9-b1e0-145b8c0c8f82</uuid> <memory unit='KiB'>2044928</memory> <currentMemory unit='KiB'>1044480</currentMemory> <vcpu placement='static'>1</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64' machine='pc-i440fx-1.4'>hvm</type> <boot dev='hd'/> <boot dev='cdrom'/> <bootmenu enable='yes'/> </os> <features> <acpi/> <apic/> </features> <clock offset='localtime'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/mnt/ocfs2/vm_idcc_devel.raw'/> <backingStore/> <target dev='vdb' bus='ide'/> <alias name='ide0-0-0'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <controller type='usb' index='0' model='piix3-uhci'> <alias name='usb'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <controller type='ide' index='0'> <alias name='ide'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:37:92:05'/> <source bridge='br0'/> <target dev='vnet6'/> <model type='rtl8139'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/6'/> <target type='isa-serial' port='0'> <model name='isa-serial'/> </target> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/6'> <source path='/dev/pts/6'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <input type='mouse' bus='ps2'> <alias name='input0'/> </input> <input type='keyboard' bus='ps2'> <alias name='input1'/> </input> <graphics type='vnc' port='5902' autoport='no' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> <video> <model type='cirrus' vram='16384' heads='1' primary='yes'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <stats period='5'/> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </memballoon> </devices> </domain> Bernd -- Bernd Lentes System Administrator Institute for Metabolism and Cell Death (MCD) Building 25 - office 122 HelmholtzZentrum München bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Public key: 30 82 01 0a 02 82 01 01 00 b3 72 3e ce 2c 0a 6f 58 49 2c 92 23 c7 b9 c1 ff 6c 3a 53 be f7 9e e9 24 b7 49 fa 3c e8 de 28 85 2c d3 ed f7 70 03 3f 4d 82 fc cc 96 4f 18 27 1f df 25 b3 13 00 db 4b 1d ec 7f 1b cf f9 cd e8 5b 1f 11 b3 a7 48 f8 c8 37 ed 41 ff 18 9f d7 83 51 a9 bd 86 c2 32 b3 d6 2d 77 ff 32 83 92 67 9e ae ae 9c 99 ce 42 27 6f bf d8 c2 a1 54 fd 2b 6b 12 65 0e 8a 79 56 be 53 89 70 51 02 6a eb 76 b8 92 25 2d 88 aa 57 08 42 ef 57 fb fe 00 71 8e 90 ef b2 e3 22 f3 34 4f 7b f1 c4 b1 7c 2f 1d 6f bd c8 a6 a1 1f 25 f3 e4 4b 6a 23 d3 d2 fa 27 ae 97 80 a3 f0 5a c4 50 4a 45 e3 45 4d 82 9f 8b 87 90 d0 f9 92 2d a7 d2 67 53 e6 ae 1e 72 3e e9 e0 c9 d3 1c 23 e0 75 78 4a 45 60 94 f8 e3 03 0b 09 85 08 d0 6c f3 ff ce fa 50 25 d9 da 81 7b 2a dc 9e 28 8b 83 04 b4 0a 9f 37 b8 ac 58 f1 38 43 0e 72 af 02 03 01 00 01

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how to check a virtual disk
by Lentes, Bernd 29 Mar '21

29 Mar '21

Hi, we have a two-node cluster with pacemaker a SAN. The resources are inside virtual domains. The images of the virtual disks reside on the SAN. On one domain i have errors from the hd in my log: 2021-03-24T21:02:28.416504+01:00 geneious kernel: [2159685.909613] JBD2: Detected IO errors while flushing file data on dm-1-8 2021-03-24T21:02:46.505323+01:00 geneious kernel: [2159704.012213] JBD2: Detected IO errors while flushing file data on dm-1-8 2021-03-24T21:02:55.573149+01:00 geneious kernel: [2159713.078560] JBD2: Detected IO errors while flushing file data on dm-1-8 2021-03-24T21:03:23.702946+01:00 geneious kernel: [2159741.202546] JBD2: Detected IO errors while flushing file data on dm-1-8 2021-03-24T21:03:30.289606+01:00 geneious kernel: [2159747.796192] ------------[ cut here ]------------ 2021-03-24T21:03:30.289635+01:00 geneious kernel: [2159747.796207] WARNING: CPU: 0 PID: 457 at ../fs/buffer.c:1108 mark_buffer_dirty+0xe8/0x100 2021-03-24T21:03:30.289637+01:00 geneious kernel: [2159747.796208] Modules linked in: st sr_mod cdrom lp parport_pc ppdev parport xfrm_user xfrm_algo binfmt_misc uinput nf_log_ipv6 xt_comme nt nf_log_ipv4 nf_log_common xt_LOG xt_limit af_packet iscsi_ibft iscsi_boot_sysfs ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_pkttype xt_tcpudp iptable_filter ip6table_mangl e nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack libcrc32c ip6table_filter ip6_tables x_tables joydev virtio_net net_fai lover failover virtio_balloon i2c_piix4 qemu_fw_cfg pcspkr button ext4 crc16 jbd2 mbcache ata_generic hid_generic usbhid ata_piix sd_mod virtio_rng ahci floppy libahci serio_raw ehci_pci bo chs_drm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm uhci_hcd ehci_hcd usbcore virtio_pci 2021-03-24T21:03:30.289637+01:00 geneious kernel: [2159747.796374] drm_panel_orientation_quirks libata dm_mirror dm_region_hash dm_log sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_ dh_alua scsi_mod autofs4 [last unloaded: parport_pc] 2021-03-24T21:03:30.289643+01:00 geneious kernel: [2159747.796400] Supported: Yes 2021-03-24T21:03:30.289644+01:00 geneious kernel: [2159747.796405] CPU: 0 PID: 457 Comm: jbd2/dm-0-8 Not tainted 4.12.14-122.57-default #1 SLE12-SP5 2021-03-24T21:03:30.289644+01:00 geneious kernel: [2159747.796406] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-0-ga698c89-rebuilt.suse.com 04/01/2014 2021-03-24T21:03:30.289645+01:00 geneious kernel: [2159747.796407] task: ffff8ba32766c380 task.stack: ffff99954124c000 2021-03-24T21:03:30.289645+01:00 geneious kernel: [2159747.796409] RIP: 0010:mark_buffer_dirty+0xe8/0x100 2021-03-24T21:03:30.289646+01:00 geneious kernel: [2159747.796409] RSP: 0018:ffff99954124fcf0 EFLAGS: 00010246 2021-03-24T21:03:30.289650+01:00 geneious kernel: [2159747.796413] RAX: 0000000000a20828 RBX: ffff8ba209a58d90 RCX: ffff8ba3292d7958 2021-03-24T21:03:30.289651+01:00 geneious kernel: [2159747.796413] RDX: ffff8ba209a585b0 RSI: ffff8ba24270b690 RDI: ffff8ba3292d7958 2021-03-24T21:03:30.289652+01:00 geneious kernel: [2159747.796414] RBP: ffff8ba3292d7958 R08: ffff8ba209a585b0 R09: 0000000000000001 2021-03-24T21:03:30.289652+01:00 geneious kernel: [2159747.796415] R10: ffff8ba328c1c0b0 R11: ffff8ba287805380 R12: ffff8ba3292d795a 2021-03-24T21:03:30.289653+01:00 geneious kernel: [2159747.796415] R13: 0000000000000000 R14: ffff8ba3292d7958 R15: ffff8ba209a58d90 2021-03-24T21:03:30.289653+01:00 geneious kernel: [2159747.796417] FS: 0000000000000000(0000) GS:ffff8ba333c00000(0000) knlGS:0000000000000000 2021-03-24T21:03:30.289654+01:00 geneious kernel: [2159747.796417] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 2021-03-24T21:03:30.289654+01:00 geneious kernel: [2159747.796418] CR2: 0000000099bff000 CR3: 0000000101b06000 CR4: 00000000000006f0 2021-03-24T21:03:30.289655+01:00 geneious kernel: [2159747.796424] Call Trace: 2021-03-24T21:03:30.289656+01:00 geneious kernel: [2159747.796470] __jbd2_journal_refile_buffer+0xbb/0xe0 [jbd2] 2021-03-24T21:03:30.289656+01:00 geneious kernel: [2159747.796479] jbd2_journal_commit_transaction+0xf1a/0x1870 [jbd2] 2021-03-24T21:03:30.289657+01:00 geneious kernel: [2159747.796489] ? __switch_to_asm+0x41/0x70 2021-03-24T21:03:30.289658+01:00 geneious kernel: [2159747.796490] ? __switch_to_asm+0x35/0x70 2021-03-24T21:03:30.289662+01:00 geneious kernel: [2159747.796493] kjournald2+0xbb/0x230 [jbd2] 2021-03-24T21:03:30.289663+01:00 geneious kernel: [2159747.796499] ? wait_woken+0x80/0x80 2021-03-24T21:03:30.289663+01:00 geneious kernel: [2159747.796503] kthread+0xf6/0x130 2021-03-24T21:03:30.289664+01:00 geneious kernel: [2159747.796508] ? commit_timeout+0x10/0x10 [jbd2] 2021-03-24T21:03:30.289664+01:00 geneious kernel: [2159747.796510] ? kthread_bind+0x10/0x10 2021-03-24T21:03:30.289665+01:00 geneious kernel: [2159747.796511] ret_from_fork+0x35/0x40 2021-03-24T21:03:30.289665+01:00 geneious kernel: [2159747.796517] Code: 1b 48 8b 03 48 8b 7b 08 48 83 c3 18 48 89 ee e8 bf 42 76 00 48 8b 03 48 85 c0 75 e8 e9 3c ff ff ff 48 89 df 5b 5d e9 c8 35 fb ff <0f> 0b e9 26 ff ff ff 48 83 e8 01 e9 5b ff ff ff 0f 1f 84 00 00 2021-03-24T21:03:30.289670+01:00 geneious kernel: [2159747.796533] ---[ end trace db796891c8ff94af ]--- 2021-03-24T21:03:46.593225+01:00 geneious kernel: [2159764.100145] JBD2: Detected IO errors while flushing file data on dm-1-8 2021-03-24T21:05:09.372772+01:00 geneious kernel: [2159846.877201] JBD2: Detected IO errors while flushing file data on dm-1-8 2021-03-24T21:06:39.943519+01:00 geneious kernel: [2159937.381068] JBD2: Detected IO errors while flushing file data on dm-1-8 2021-03-24T21:07:42.364311+01:00 geneious kernel: [2159999.793805] JBD2: Detected IO errors while flushing file data on dm-1-8 2021-03-24T21:07:57.822133+01:00 geneious kernel: [2160015.291776] JBD2: Detected IO errors while flushing file data on dm-1-8 First i'm wondering: what is dm-1-8 ? I don't have a device like that. geneious:~ # find /dev -iname '*dm*' /dev/dm-1 /dev/dm-0 /dev/disk/by-id/dm-uuid-LVM-a9Cy1cweHgXlAEECqZL5KZBfnuigUG6lq0ntdZJxxLIIp5G8XihsuYrTbx7Rs0vc /dev/disk/by-id/dm-name-vg_local-lv_var /dev/disk/by-id/dm-uuid-LVM-a9Cy1cweHgXlAEECqZL5KZBfnuigUG6l3fdsOpBFoDWral3Fa7c6ZeYECmLd6FFj /dev/disk/by-id/dm-name-vg_local-lv_root /dev/cpu_dma_latency I just find /proc/fs/jbd2/dm-1-8. There is a file /proc/fs/jbd2/dm-1-8/info: 453005 transactions (319055 requested), each up to 8192 blocks average: 0ms waiting for transaction 12ms request delay 5124ms running transaction 0ms transaction was being locked 0ms flushing data (in ordered mode) 44ms logging transaction 8031us average transaction commit time 64 handles per transaction 5 blocks per transaction 6 logged blocks per transaction What is that ? The logfile says also something about dm-0-8: 2021-03-24T21:03:30.289644+01:00 geneious kernel: [2159747.796405] CPU: 0 PID: 457 Comm: jbd2/dm-0-8 Not tainted 4.12.14-122.57-default #1 SLE12-SP5 geneious:~ # find / -iname dm-0-8 /proc/fs/jbd2/dm-0-8 geneious:~ # ll /proc/fs/jbd2/dm-0-8 total 0 -r--r--r-- 1 root root 0 Mar 29 12:56 info geneious:~ # cat /proc/fs/jbd2/dm-0-8/info 7356 transactions (556 requested), each up to 8192 blocks average: 0ms waiting for transaction 20ms request delay 5628ms running transaction 4ms transaction was being locked 0ms flushing data (in ordered mode) 132ms logging transaction 134769us average transaction commit time 52 handles per transaction 18 blocks per transaction 19 logged blocks per transaction geneious:~ # I assume i have a harddisk problem. I'm checking currently the SAN with its own tools, via a web interface. Afterwards i want to stop the domain, boot it with a live cd and run badblocks and fsck.ext3. What else can i do ? Bernd -- Bernd Lentes System Administrator Institute for Metabolism and Cell Death (MCD) Building 25 - office 122 HelmholtzZentrum München bernd.lentes(a)helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Public key: 30 82 01 0a 02 82 01 01 00 b3 72 3e ce 2c 0a 6f 58 49 2c 92 23 c7 b9 c1 ff 6c 3a 53 be f7 9e e9 24 b7 49 fa 3c e8 de 28 85 2c d3 ed f7 70 03 3f 4d 82 fc cc 96 4f 18 27 1f df 25 b3 13 00 db 4b 1d ec 7f 1b cf f9 cd e8 5b 1f 11 b3 a7 48 f8 c8 37 ed 41 ff 18 9f d7 83 51 a9 bd 86 c2 32 b3 d6 2d 77 ff 32 83 92 67 9e ae ae 9c 99 ce 42 27 6f bf d8 c2 a1 54 fd 2b 6b 12 65 0e 8a 79 56 be 53 89 70 51 02 6a eb 76 b8 92 25 2d 88 aa 57 08 42 ef 57 fb fe 00 71 8e 90 ef b2 e3 22 f3 34 4f 7b f1 c4 b1 7c 2f 1d 6f bd c8 a6 a1 1f 25 f3 e4 4b 6a 23 d3 d2 fa 27 ae 97 80 a3 f0 5a c4 50 4a 45 e3 45 4d 82 9f 8b 87 90 d0 f9 92 2d a7 d2 67 53 e6 ae 1e 72 3e e9 e0 c9 d3 1c 23 e0 75 78 4a 45 60 94 f8 e3 03 0b 09 85 08 d0 6c f3 ff ce fa 50 25 d9 da 81 7b 2a dc 9e 28 8b 83 04 b4 0a 9f 37 b8 ac 58 f1 38 43 0e 72 af 02 03 01 00 01

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vcenter on esxi on KVM on RHEL8
by Nicholas Hardiman 29 Mar '21

29 Mar '21

I tried something new at the weekend - I created a lab for ansible experiments. One PC, two ESXi VMs, some nested guests. Is this a sensible thing to attempt? vcenter ubuntu1 ubuntu2 ------- ------- ------- ESXi1 ESXI2 ---------------- ------------- KVM -------------------------------- RHEL 8 -------------------------------- ASUS PN50 Everything within ESXi1 works fine, but communication with the outside world is not fine. Before I get into troubleshooting details, I thought I'd just check if this is a reasonable thing to do, or if I'm heading in the wrong direction. Thanks, Nick -- Nick Hardiman, RHCA Senior Consultant Red Hat <https://www.redhat.com/> nhardima(a)redhat.com M: 07585-206195 Upcoming PTO: - Upcoming Training: Mon 8 - Fri 12 March <https://www.redhat.com/>

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Packets dropped by virtual NICs
by Silvia Fichera 29 Mar '21

29 Mar '21

Hi all, I want to use tc qdisc settings in a network coposed of several qemu VMs, connected through bridges and tap interfaces. I generate traffic with a spirent. Everything is fine when the scheduling discipline is not installed but when I run the command to set taprio queues traffic on the VM's NIC the traffic is dropped, i can send max 1mbps. I think that there is something missing in the virtual NIC configuration or setup. With ethtool i can see that queues are configured. I've also noticed the BQL equals to 0, that is different than the physical machine (BQL=18600) where everything works correctly. I've read that it could be because NIC drivers do not support that setting. Do you have any suggestions? Thanks you all Silvia

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