November 2018 - Users - libvirt List Archives

[libvirt-users] [virtual interface] detach interface during boot succeed with no changes
by Yalan Zhang 08 Sep '22

08 Sep '22

Hi guys, when I detach an interface from vm during boot (vm boot not finished), it always fail. I'm not sure if there is an existing bug. I have confirmed with someone that for disk, there is similar behavior, if this is also acceptable? # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 2; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <interface type='network'> <mac address='52:54:00:98:c4:a0'/> <source network='default' bridge='virbr0'/> <target dev='vnet0'/> <model type='rtl8139'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> When I detach after the vm boot, expand the sleep time to 10, it will succeed. # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 10; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully ------- Best Regards, Yalan Zhang IRC: yalzhang Internal phone: 8389413

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[libvirt-users] Add Virtlyst to the list of libvirt users
by Daniel Nicoletti 23 Sep '20

23 Sep '20

Hi, I've just released v1.0.0 of Virtlyst[1] a web tool to manage VMs using Qt/C++/Cutelyst https://dantti.wordpress.com/2018/04/19/announcing-virtlyst-a-web-interface… Thanks. 1 - https://github.com/cutelyst/Virtlyst -- Daniel Nicoletti KDE Developer - http://dantti.wordpress.com

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[libvirt-users] Question about disabling UFO on guest
by Bao Nguyen 05 Aug '20

05 Aug '20

Hello everyone, I would like to ask a question regarding to disable UFO of virtio vNIC in my guest. I have read the document at https://libvirt.org/formatdomain.html *host* The csum, gso, tso4, tso6, ecn and ufo attributes with possible values on and off can be used to turn off host offloading options. By default, the supported offloads are enabled by QEMU. *Since 1.2.9 (QEMU only)* The mrg_rxbuf attribute can be used to control mergeable rx buffers on the host side. Possible values are on (default) and off. *Since 1.2.13 (QEMU only)* *guest* The csum, tso4, tso6, ecn and ufo attributes with possible values on and off can be used to turn off guest offloading options. By default, the supported offloads are enabl ed by QEMU. *Since 1.2.9 (QEMU only)* Then I disabled UFO on my vNIC on guest as the following configuration <devices> <interface type='network'> <source network='default'/> <target dev='vnet1'/> <model type='virtio'/> <driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off' queues='5' rx_queue_size='256' tx_queue_size='256'> *<host gso='off' ufo='off' />* *<guest ufo='off'/>* </driver> </interface> </devices> Then I reboot my node to get the change effect and it works. However, can I disable the UFO without touching the host OS? or it always has to disable on both host and guest like that? Thanks, Brs, Natsu

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[libvirt-users] Libvirt api for esx
by ROHIT SINGH 13 Dec '18

13 Dec '18

Hi, I am doing poc for using libvirt api for implementation of esx in python. I tried researching through module but did not find a way how it works for esx. Any help on how to proceed specifically for esx would be of great help. Please let me know as soon as possible, lagging on deliverables. Thanks for help!! Regards Rohit Singh

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[libvirt-users] console type tcp with logging
by Vasiliy Tolstov 03 Dec '18

03 Dec '18

Hi! I want to have ability to connect to guest console via libvirt api (and expose this data to xtermjs via websocket) with getty tty. And also i want to have log of tty1 (do log grub, kernel booting and errors). What i need to do in libvirt xml for such case? -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru

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[libvirt-users] virsh console and other language keymaps
by Michael Taboada 29 Nov '18

29 Nov '18

Hi, I've got a small vm server running kvm + libvirt, and I made a simple shell script that allows users to ssh in and control their vms (power off, etc). However, one of my users uses the french canadian keyboard layout on her home computer, and upon being told "escape character is ^]" expected to need to press ctrl+right-alt_] (] being in the same location it is on a US keyboard). This is because on a french canadian layout, the right bracket key is in the same spot at on US layout, but needs to press right alt with it or it is the c-cedilla key. However, upon pressing ctrl+right-alt+c-cedilla, nothing happens (even this is ctrl+right bracket on a canadian keyboard). Instead, pressing ctrl+c-cedilla on her canadian french keyboard exits the console as if it were using a US layout. My question: how to make it so pressing ctrl+(canadian ]) works? Is this something that has to be done on the vm side, or on the host side, or maybe on the client ssh side? I'd prefer it be something thast can be different based on who is using the virsh console command since me, as the admin, may need to help with the console at some points, and my keyboard is US, so I have no c-cedilla or canadian right bracket key, but she does. Thanks, -Michael.

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[libvirt-users] Unable to configure libxl's memory management parameters
by Mathieu Tarral 28 Nov '18

28 Nov '18

Hi ! I'm trying to get a working installation of Xen 4.11 from source, with Libvirt. I managed to compile, install and boot on Xen so far. But when I start the libvirt daemon, it fails with the following error: info : libvirt version: 4.1.0, package: 5.fc28 (Fedora Project, 2018-08-23-19:00:58, buildvm-19 error : libxlDriverConfigNew:1644 : Unable to configure libxl's memory management parameters error : virStateInitialize:775 : Initialization of LIBXL state driver failed: no error error : daemonRunStateInit:837 : Driver state initialization failed So there are 2 things here: - why libvirt is unable to configure Libxl ? where should i look for any clues ? - "Initialization of LIBXL state driver failed: no error" it looks like a bug in Libvirt, if it fails, an error message should be reported Thank you. -- Mathieu Tarral Sent with ProtonMail Secure Email.

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[libvirt-users] Sasl+tls setup
by Anastasiya Ruzhanskaya 28 Nov '18

28 Nov '18

Hello everyone, I am trying to set up sasl authentication in virt-manager. I read in one existing bug, that it is better to use tls for encryption and sasl for authentication, but not use sasl for both. I configured tls, it was fine. Then I created a user "u" on server and modified libvirtd.conf. I set auth_tls = "sasl" there and mech_list: scram-sha-1 in sasl2 config for libvirt. The output of sasl: u@ubuntu2:~$ sudo sasldblistusers2 -f /etc/libvirt/passwd.db u@ubuntu: userPassword Then I connect to server using tls and entering as the user u. Then I have the following message: Unable to connect to libvirt qemu+tls://u@192.168.246.135/system. authentication failed: authentication failed What are the correct steps to set up everything right. I just followed this: set up tls, set up user, modify config file, relaunch and connect.

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[libvirt-users] Sasl + tls setup
by Anastasiya Ruzhanskaya 28 Nov '18

28 Nov '18

Hello everyone, I am trying to set up sasl authentication in virt-manager. I read in one existing bug, that it is better to use tls for encryption and sasl for authentication, but not use sasl for both. I configured tls, it was fine. Then I created a user "u" on server and modified libvirtd.conf. I set auth_tls = "sasl" there and mech_list: scram-sha-1 in sasl2 config for libvirt. The output of sasl: u@ubuntu2:~$ sudo sasldblistusers2 -f /etc/libvirt/passwd.db u@ubuntu: userPassword Then I connect to server using tls and entering as the user u. Then I have the following message: Unable to connect to libvirt qemu+tls://u@192.168.246.135/system. authentication failed: authentication failed What are the correct steps to set up everything right. I just followed this: set up tls, set up user, modify config file, relaunch and connect.

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[libvirt-users] External Snapshots vs Core Dump.
by Tanmoy Sinha 26 Nov '18

26 Nov '18

Hi, I would like to get a clear picture on external snapshots memory dump ( i.e. system-checkpoint) vs dumping the memory of the guest. I have created external snapshots which produces a disk file and a memory file. I am not able to use this memory file in any memory analysis tools, for instance volatility. However, the memory dump taken through "virsh dump" works just fine with such tools. What am I missing here? The memory dump generated through external snapshot seems to be compressed, compared to the one generated by virsh dump. Can I specify the memory dump format in the snapshot XML? Was reading through a couple of old threads in libvirt-users, haven't found anything conclusive. If this is a redundant query, guide me me to the thread. Thanks, Tanmoy

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