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PHP Warning: libvirt_domain_new(): Cannot get installation XML
by Benjamin Smith 29 Mar '22

29 Mar '22

Despite great success at using php-libvirt with other functions, I have been entirely unsuccessful in getting it to create a new domain/machine. Any time I do, and with virtually anything I try, I get the above error message. Running PHP 7.4 (remi) on otherwise stock AlmaLinux. *[root@sb4 html]# cat /etc/redhat-release AlmaLinux release 8.5 (Arctic Sphynx* *[root@sb4 html]# rpm -qa php php-fpm php-libvirt nginxphp-7.4.28-1.el8.remi.x86_64nginx-1.14.1-9.module_el8.3.0+2165+af250afe.alma.x86_64php-fpm-7.4.28-1.el8.remi.x86_64php-libvirt-0.5.5-1.el8.remi.7.4.x86_6412 XEON E312xx cores, 24 w/HT, 192GB RAM, etc. * When I run it, I find in php-fpm www.error-log: *[24-Mar-2022 20:05:51 UTC] PHP Warning: libvirt_domain_new(): Cannot get installation XML in /var/www/html/manage.php on line 190* Matching message onscreen: *Warning: libvirt_domain_new(): Cannot get installation XML in /var/www/html/manage.php on line 191* Here's the offending code: $networks = [ *'mac'* => '52:54:00:06:a7:df', *'network'* => 'default', *'model'* => *'e1000'*, ]; $disks = [ *'path'* => *"/var/lib/libvirt/images/myvm.qcow2"*, *'driver'* => *'qcow2'*, *'bus'* => *'ide'*, *'dev'* => *'hda'*, *'size'* => *'40G'*, *'flags'* => null, ]; error_reporting(-1); $result = libvirt_domain_new( $conn, 'myvm',* // name of the new domain* null,* // optional architecture string, can be NULL to get default (or false)* 2048,* // number of megabytes of RAM to be allocated for domain* 8192,* // maximum number of megabytes of RAM to be allocated for domain* 2,* // number of VCPUs to be allocated to domain* *'/var/www/html/AlmaLinux-8.4-x86_64-dvd.iso'*,* // installation ISO image for*$ $disks,* // array of disk devices for domain* $networks, null ); I've tried various values for $disks and $networks, setting error reporting to -1 (display anything and everything), journalctl -f on both the webserver and the virt host, etc but was never able to see any error other than this one. I've also been looking in the source code file for anything obvious, and I've been utterly unsuccessful in changing the error message. For example, inserting an invalid path for the ISO image doesn't result in an error message that it *looks* like it should be throwing errors about invalid ISO image. In fact, I've even tried passing ALL NULL/EMPTY VALUES and with the exception of the $conn connection variable, I only get this "Cannot get installation XML" error message: $result = libvirt_domain_new( $conn, null, null, null, null, null, null, [], [] ); Shouldn't I at least be seeing a message like "Name is 'myvm', memMB is 2048, maxmemMB is 8192" ? https://github.com/php/pecl-virtualization-libvirt/blob/master/src/libvirt-…

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How to make the libvirt VM installed under the regular user boot during the system bootup?
by Martin T 21 Mar '22

21 Mar '22

Hi. I installed a virtual machine under a regular user(in other words, not under root user) with virt-install and configured this VM to boot automatically: $ virsh dominfo vm Id: 1 Name: vm UUID: eef95dd6-5efe-4059-8dcc-3e35db12f55d OS Type: hvm State: running CPU(s): 4 CPU time: 253.7s Max memory: 4194304 KiB Used memory: 4194304 KiB Persistent: yes Autostart: enable Managed save: no Security model: none Security DOI: 0 $ ls -l /home/user/.config/libvirt/qemu/autostart/ total 0 lrwxrwxrwx 1 user user 47 Apr 30 16:59 vm.xml -> /home/user/.config/libvirt/qemu/vm.xml $ The vm indeed starts automatically, but only when the regular user has logged in. I would like libvirtd(started by the systemd) to execute this VM already during the system bootup when the regular user has not yet logged in. How to accomplish this? I also made a symlink under /etc/libvirt/qemu/autostart/, but this did not help. thanks, Martin

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how to reliably shutdown domains ?
by Lentes, Bernd 09 Mar '22

09 Mar '22

Hey guys, i have a two-node cluster with around 20 domains. Cluster-Software is pacemaker and corosync, OS is SLES 12 SP5. The scripts for starting/stopping the domains use virsh. Is there a way to reliably shutdown the domains via virsh ? I'm testing around, but sometimes the domains stop, sometimes they don't, sometimes it takes very long so that the cluster times out and fence the respective node. I'm using "virsh shutdown domain --mode acpi,agent" for the windows domains (not reliable) and for the linux domains "virsh shutdown domain", also not reliable. What 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 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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Resize backing store
by Jeff Brown 08 Mar '22

08 Mar '22

Apologies in advance if this be a stupid question, as everything I've read seems to suggest it's impossible. Slowly running out of space on a 200GB root partition. Is it possible to create a snapshot - leaving the QCOW2 image 'quiescent' - resize it using 'qemu-img resize' - then pivot the snapshot back? (Then shutdown, attach the storage to another bootable OS, and run fdisk and resize2fs.) Everything I've read says to shutdown the VM; but besides the real possibility of the snapshot blockcommit being corrupted when pivoted into the newly resized backing store, I don't see why it shouldn't work. And save some significant downtime. Please can someone advise if this is actually possible, or if I'm wasting my time? Thanks! -- Jeff Brown Future Foundation Cell 074 101 5170 VoIP 087 550 1210 Fax: 086 532 3508

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About RO connection
by Xingbo Kan 08 Mar '22

08 Mar '22

Dear developers and users: Is there any standard or convention of which kind of APIs&flags could be invoked by RO connection? If there is any, please tell me in detail, thanks a lot! Kind regards, xkan

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Number of the max supported VFs are different
by Yalan Zhang 08 Mar '22

08 Mar '22

Hi there, I have an Intel X520 network card, and I find the max supported VFs are different. Please check below outputs: # lspci -vvv -s 04:00.0 04:00.0 Ethernet controller: Intel Corporation Ethernet 10G 2P X520 Adapter (rev 01) ... Capabilities: [160 v1] Single Root I/O Virtualization (SR-IOV) IOVCap: Migration-, Interrupt Message Number: 000 IOVCtl: Enable- Migration- Interrupt- MSE- ARIHierarchy+ IOVSta: Migration- ** Initial VFs: 64, Total VFs: 64**, Number of VFs: 0, Function Dependency Link: 00 VF offset: 128, stride: 2, Device ID: 10ed Supported Page Size: 00000553, System Page Size: 00000001 Region 0: Memory at 0000000094400000 (64-bit, prefetchable) Region 3: Memory at 0000000094500000 (64-bit, prefetchable) VF Migration: offset: 00000000, BIR: 0 Kernel driver in use: ixgbe Kernel modules: ixgbe # cat /sys/class/net/enp4s0f0/device/sriov_totalvfs 63 # echo 64 > /sys/class/net/enp4s0f0/device/sriov_numvfs -bash: echo: write error: Numerical result out of range # echo 63 > /sys/class/net/enp4s0f0/device/sriov_numvfs # cat /sys/class/net/enp4s0f0/device/sriov_numvfs 63 The lspci command says the Total VFs supported is 64, while in the file "sriov_totalvfs" says it's 63. And the sriov_numvfs file will take precedence. Why are the numbers different? Just a little curious. Thank you! ------- Best Regards, Yalan Zhang IRC: yalzhang

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libvirtd file descriptors leaking
by Дмитрий 01 Mar '22

01 Mar '22

Hello, ## SETUP CentOS 8 Stream libguestfs-tools.noarch 1:1.40.2-24.el8.plesk libvirt.x86_64 7.6.0-6.el8s ## ISSUE REPRODUCTION lsof -p $(cat /run/libvirtd.pid) | wc -l # here we have N open file descriptors by libvirtd guestfish --ro -d domain1 run # here we have N+1 open file descriptors by libvirtd Ctrl+D # and we still have N+1 open file descriptors by libvirtd virt-df -d domain1 # after completion we still having N++ open file descriptors by libvirtd To fix this issue i am force to restart libvirtd

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QEMU args generation order with libvirt
by M, Shivakumar 28 Feb '22

28 Feb '22

Hello, We are trying to bring up the Android VM with Libvirt, as part of this exercise it is advised to keep Replay Protected Memory Block (RPMB) device as the first virtio device in the QEMU arg list, as the secure storage daemon in Andriod side communicates with dev/vport0p1 for RPMB usage. Is there any way we can make a qemu commands generation in particular order with Libvirt XML ? Thanks, Shivakumar M

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virtio 3d acceleration - centOS 9 - ?
by lejeczek 27 Feb '22

27 Feb '22

Hi guys Would anybody know if RHEL & all involved gangs plan or think to have c9, when is GA, offer/support 3d virtio? many thanks, L.

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networking question
by Natxo Asenjo 25 Feb '22

25 Feb '22

hi, I have an issue with one host at a customer's site. I think this cannot work, but I would like to ask you just in case I am confused. host: eno1: 172.20.10.x/24 management interface gw 172.20.10.254 bridge-service: 0.0.0.0/24 tun0: openvpn tunnel to external data center internal-bridge: x.x.x.x/28 ; routed subnet that goes to openvpn tun0 on vm: eth0: x.x.x.x/28 on internal-bridge (default gw) eth1: 172.20.10.x/24 bridge-service gw 172.20.10.254 (same as eno1) Connectivity to and from openvpn (from and to datacenter) is perfect. All vms are directly reachable from our management services, no natting. >From hypervisor I can ping the gw, from vm I cannot ping 172.20.10.254. My gut feeling is that this cannot work because traffic for the hypervisor for subnet 172.20.10.x/24 flows through eno1, but for vm through the bridge-loggin interface. So that cannot work. Should we just ask the customer to give us different subnets for the host and the vm? TIA. -- regards, Natxo

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