- Users - libvirt List Archives

Feature request? Auto start vm upon next shutdown
by Marc Roos 22 Jun '20

22 Jun '20

Sometimes when you change the configuration, this configuration change will only be available after a shutdown. Not to have to monitor when the vm shuts down, to start it again. It could be nice to have libvirt start it one time. Something like: 1. change the network interface of a running guest 2. at the prompt of the virt-manager "Some changes may require a guest shutdown to take effect" introduce check box 'Auto start vm upon next shutdown' 3. shutdown the guest 4. after the guest completed shutdown, libvirt is automatically starting it again.

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NVDIMM sizes and DIMM hot plug
by Milan Zamazal 19 Jun '20

19 Jun '20

Hi, I've found out that NVDIMM size and label size matter for regular (non-NV) DIMM hot plug. If the NVDIMM is not aligned correctly, the guest OS will not accept the hot plugged memory and will complain with messages such as Block size [0x8000000] unaligned hotplug range: start 0x225000000, size 0x10000000 The start address above is also reported within <memory> element of the hot plugged memory in the domain XML: <address type='dimm' slot='1' base='0x225000000'/> Apparently, in order to make memory hot plug working in the guest OS, the inserted memory must be aligned to the platform memory alignment (128 MB on x86_64). I'd like to clarify, how libvirt makes the DIMM address above. How is the NVDIMM memory range determined? According to my experiments, it seems the NVDIMM specified <size> is taken, NVDIMM <label> size is subtracted from it and the resulting value is reduced to the nearest multiple of NVDIMM <alignsize>. Is this observation correct? Is it guaranteed to be stable in future versions? I need to determine the right NVDIMM size to make the subsequent memory modules correctly aligned and then I can't change the NVDIMM size, to not damage data stored in the NVDIMM. Additionally, when adjusting maxMemory due to NVDIMM presence, should I increase it by the specified NVDIMM <size> or a different value? Thank you, Milan

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Guidance for First Timer
by Sanyam Rajpal 18 Jun '20

18 Jun '20

Hey everyone, I am a first-time contributor and I was interested in this project. I wanted to make some open source contributions and learn. I am not looking for getting enrolled in the program. Sanyam

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Is it possible to configure libvirt's MAC generation?
by Ian Pilcher 17 Jun '20

17 Jun '20

Is it possible to configure libvirt to generate "predictable" MAC addresses for virtual NICS? (A configuration which accomplishes this by limiting the pool of available addresses would be acceptable for my use case.) Read on for why I want to do this ... I have a somewhat unusual use case. I am working with the OpenShift bare metal "IPI" installation process, which is documented here: https://openshift-kni.github.io/baremetal-deploy/4.4/Deployment.html At a high level, the installation process goes like this: 1. Install RHEL 8 on the "provisioner" node. 2. Configure a couple of bridges on the provisioner node, which will be used by the "bootstrap VM" (see below). 3. Create a configuration file & do various other things. 4. Run the installer a. Installer creates a "bootstrap VM" on the provisioning node, which does the actual work of kicking off the OpenShift installation. The bootstrap VM runs Red Hat Enterprise Linux CoreOS (RHCOS). b. Bootstrap VM requests an IP address via DHCP. <====== ****** Step 4b is problematic in this environment. Because of routing and firewall rules, I really need the bootstrap VM to have a predictable IP address. It is possible to configure a static IP address on the bootstrap VM via the CoreOS ignition file, and we've successfully done this, but ... RHCOS requests an IP address via DHCP *before* it processes the ignition file. If this fails, it appears to simply give up. So we need to have our DHCP server provide an address to the bootstrap VM, even if it isn't ever used. And of course, we're not allowed to configure the DHCP server to respond to any old MAC address that comes along; we're only allowed to respond to known MAC addresses. Hopefully this all makes sense, and hopefully it explains why being able to configure libvirt's MAC pool/sequence would allow things to work in this environment. Thanks! -- ======================================================================== In Soviet Russia, Google searches you! ========================================================================

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Reintroduce modern CPU in model selection
by Gionatan Danti 16 Jun '20

16 Jun '20

Hi list, in virt-manager ver. 2.2.1 (fully upgraded CentOS 8.1), the CPU model list only shows ancient CPU (the most recent is Nehalem-IBRS). On the other hand, in virt-manager 1.5.x (fully upgraded CentOS 7.8) we have a rich selection of CPU (as recent as Icelake). Why was the list in newer virt-manager so much trimmed? Is it possible to enlarge it? Thanks. -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it [1] email: g.danti(a)assyoma.it - info(a)assyoma.it GPG public key ID: FF5F32A8

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Live migration to another volume at the same host
by Paul van der Vlis 12 Jun '20

12 Jun '20

Hello, I am looking for a way to migrate a VM live to another location. The qcow2 images are now on /data , but I want to move some of them to a volume mounted on /data2 what's faster. Is this possible without downtime? With regards, Paul -- Paul van der Vlis Linux systeembeheer Groningen https://www.vandervlis.nl/

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Migrate to a bigger disk possible?
by Paul van der Vlis 12 Jun '20

12 Jun '20

Hello, I have a qcow2 disk what needs to become increased. I don't have space on the location where it is now to have it two time, so I want to live-migrate it to another host. On the other host I have to create a qcow2 disk before I can migrate. What would happen when I would create there a bigger qcow2 disk then the original one? Can I resize the filesystem after the migration? With regards, Paul van der Vlis -- Paul van der Vlis Linux systeembeheer Groningen https://www.vandervlis.nl/

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Fwd: Hello
by K. Kahurani 11 Jun '20

11 Jun '20

---------- Forwarded message --------- From: K. Kahurani <k.kahurani(a)gmail.com> Date: Sun, May 31, 2020 at 2:26 PM Subject: Hello To: <eblake(a)redhat.com> Hello, Hopefully this finds you well. This is not a bug report but more or less an inquiry as based on the information acquired from Jim Fehlig a while back, it is possible you would have some important information regarding this. It is currently not possible for me to compile libvirt right from the word go while configuring with the error [1]. From the look of it and a bit of searching on the internet, it does look like the package portablexdr is obsolete. Could it be that this is a known issue? Could it be there already is a workaround this? Do you suppose this should go into the mailing list? Sincerely, David. [1] checking for WIRESHARK_DISSECTOR... no checking for xdrmem_create in -lportablexdr... no checking for library containing xdrmem_create... no configure: error: Cannot find a XDR library

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Disable virtlockd
by Felix Queißner 10 Jun '20

10 Jun '20

Hello! Is it possible to disable the virtlockd daemon or VM file locking? I start qemu with a -snapshot option which prevents and changes to the disk image anyways. Using <readonly /> is not supported for IDE disks. Another option would be to not require locking on the NFS share, but i have no idea how. Can someone help me with that? Regards Felix Queißner

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No outbound connectivity from guest VM(fedora 32)
by Justin Stephenson 10 Jun '20

10 Jun '20

Hi, I recently installed a fresh install of Fedora 32 and I am having trouble with my virtual machine networking, I can ssh and connect into my guest VMs from my host, but the guest VMs cannot ping out to the internet. I am using the "default" NAT virtual network, the interesting thing is I have made no configuration changes on my host or in the guest VMs, simply created and installed two VMs(Fedora and RHEL8) in Fedora where the VMs are having the same issue. I am happy to provide any logs or command output if that would help. -Justin

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