May 2020 - Users - libvirt List Archives

Migrate to a bigger disk possible?
by Paul van der Vlis 11 Jun '20

11 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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libvirt-defined network vs/and openvswitch bridge
by Po Dragonwarrior 01 Jun '20

01 Jun '20

Hi all, Can you please explain to me what is the difference (or maybe the relation?) between a libvirt defined network and an openvswitch bridge? best, Po

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About Libvirt Setmem&dommemstat Function
by 🍭 20 May '20

20 May '20

I have sent a similar email about this problem. But I did not describe carefully, so I would like to explain it in more details. I am using 'virsh setmem' to ajust vm memory online. However, I don't know what is the lowerlimit that can be set to. And I try to use 'virsh dommemstat' to get 'unused' memory so that I can calculate the lowerlimit memory with this value, but it doesn't work when it comes to windows systems as I cannot set vm memory down to 'available - unused' in windows system. I suppose it's caches memory that causes this problem, so I upgrade my libvirt & qemu in order to get 'stat_disk_caches'. Although I upgrade libvirt to v4.10.0, qemu upgrade to v4.1.0, I cannot get this value. In summary, I came across two problems. How can I know the exact lowerlimit memory that can be set to in one vm? And if I need 'stat_disk_caches' value, how can I get it properly? My libvirt version: v4.10.0, qemu version:v4.1.0, hypervisor working on centos7.6 system.

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macvtap direct
by Subhendu Ghosh 19 May '20

19 May '20

Hi Couple of questions around macvtap direct usage: 1) is the document here current? https://libvirt.org/formatnetwork.html#examplesDirect I have been able to get host to guest network traffic without any special configuration or switch since Fedora 28 when I first started using it. Using <forward mode=vepa> requires switch port mirroring, but just using <forward mode=bridge> doesn't. 2) do any of the language libraries make assumptions that libvirt networks must have a <bridge name=xx> attribute? Foreman's Ruby interface to libvirt errors out with attempting to build a VM on a KVM host with a network defined with <forward mode=bridge> https://projects.theforeman.org/issues/25890 thanks Subhendu

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About Libvirt Setmem&dommemstat Function
by 🍭 19 May '20

19 May '20

I am using 'virsh setmem' to adjust the vm memory. But I don't know what is the lowerlimit memory that can be adjusted to, so I try to update the version of libvirt&qemu to get caches of the vm memory so that I can calculate the lowerlimit. And when I upgrade libvirt to 4.10.0, qemu upgrade to 4.1.0, still, I cannot get 'stat-disk-caches'.  How can I solve it ? Thx.

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Firmware auto-select limitation
by GUOQING LI 15 May '20

15 May '20

Hi everyone and Martin I would like to confirm the conversation we had in regard the possible limitation of firmware auto-select feature that’s been released since v5.20. I recall you saying that there were a lot of issues with auto select and later they shipped it into a Json file , it still didn’t solve all the problems, did it? Is it better to explicitly specify the loader and nvram path than using auto-select ? Just today, I encountered the issue of using firmware=“efi” on libvirt 5.4.0 I am running Ubuntu eoan 19.10, I am wondering how did it happen. Detailed error Error starting domain: internal error: process exited while connecting to monitor: 2020-05-15T14:19:06.033267Z qemu-system-x86_64: -drive file=/usr/share/OVMF/OVMF_CODE.fd,if=pflash,format=raw,unit=0,readonly=on: Failed to lock byte 100 Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb callback(*args, **kwargs) File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 66, in newfn ret = fn(self, *args, **kwargs) File "/usr/share/virt-manager/virtManager/object/domain.py", line 1279, in startup self._backend.create() File "/usr/lib/python3/dist-packages/libvirt.py", line 1080, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirt.libvirtError: internal error: process exited while connecting to monitor: 2020-05-15T14:19:06.033267Z qemu-system-x86_64: -drive file=/usr/share/OVMF/OVMF_CODE.fd,if=pflash,format=raw,unit=0,readonly=on: Failed to lock byte 100

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DNSMASQ Libvirt
by Santhosh Kumar Gunturu 15 May '20

15 May '20

Hi, Net-dump xml File. root@NFV-FRU:~# virsh net-dumpxml data-2 <network> <name>data-2</name> <uuid>ace4935f-0367-4632-be7c-61bab2da7d4a</uuid> <bridge name='data-2br1' stp='on' delay='0'/> <mac address='52:54:00:46:43:7d'/> <ip address='10.12.12.1' netmask='255.255.255.240'> <dhcp> <range start='10.12.12.4' end='10.12.12.4'/> </dhcp> </ip> </network> The DHCP response is going with Subnet Mask 255.255.255.0 10.12.12.1.bootps > 10.12.12.4.bootpc: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x7331d77a, Flags [none] (0x0000) Your-IP 10.12.12.4 Server-IP 10.12.12.1 Client-Ethernet-Address 52:54:00:5f:ab:94 (oui Unknown) Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Offer Server-ID Option 54, length 4: 10.12.12.1 Lease-Time Option 51, length 4: 3600 RN Option 58, length 4: 1800 RB Option 59, length 4: 3150 Subnet-Mask Option 1, length 4: 255.255.255.0 BR Option 28, length 4: 10.12.12.255 Domain-Name-Server Option 6, length 4: 10.12.12.1 Can I know the reason ? Thanks & Regards Santhosh Kumar Gunturu

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What is expiry time represents in this format
by Santhosh Kumar Gunturu 15 May '20

15 May '20

I see the output. root@X10SDV-8C-TLN4F:/mnt/config# cat /var/lib/libvirt/dnsmasq/mgmt-1br1.status [ { "ip-address": "192.168.27.8", "mac-address": "52:54:00:42:21:14", "hostname": "vyatta", "expiry-time": 1589500228 } ] Can you please explain what does the expiry-time mean ? What are its units ? Please let me know. Thanks & Regards Santhosh Kumar Gunturu

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Re: Storage cleaning
by Lothar Schilling 14 May '20

14 May '20

Thank you, that's it! virsh vol-list storage VM1 /dev/storage/VM1.img VM2 /dev/storage/VM2.img VM3 /dev/storage/VM3.img [dead] VM4 /dev/storage/VM4.img [dead] A last stupid question (I don't want to make a big mistake ...): Is virsh vol-delete VM3 virsh vol-delete VM4 the right command to get rid of the offending ones? Am 14.05.2020 um 19:10 schrieb Alvin Starr: > > virsh pool-list > you will get something like: > Name State Autostart > ----------------------------------------------- > default active yes > gnome-boxes active no > windows-openstack-image active yes > > then run virsh vol-list <your volume name> > > and you should be able to see the volumes that are still defined. > > > On 5/14/20 1:01 PM, Lothar Schilling wrote: >> virsh list --all >> >> 15 VM1 running >> 16 VM2 running >> >> ps ax | grep virt >> >> 14281 ? Sl 1170:30 /usr/libexec/qemu-kvm -name VM1 [...] >> 14384 ? Sl 376:45 /usr/libexec/qemu-kvm -name VM2 [...] >> >> Am 14.05.2020 um 17:45 schrieb Alvin Starr: >> >>> List your storage pool to insure that they have been deleted from >>> the pool. >>> If they are not there anymore then check to make sure nothing is >>> running that would have the VM images open. >>> >>> On 5/14/20 11:01 AM, Lothar Schilling wrote: >>>> Hi everybody, >>>> >>>> we have a Centos 6 host with libvirtd 0.10.2. It's holding a >>>> storage pool of about 3.5 TB with 4 VMs. I decided to rearrange >>>> them, so I destroyed and undefined two of them. But now I am not >>>> able to install a new one because virsh gives me an "not enough >>>> space left". Those two undefined VMs still linger around somehow >>>> occupying a lot of that storage. How can I get rid of them? >>>> >>>> Name: storage >>>> UUID: 8b25e085-38d8-5a09-f80f-a29150f25d42 >>>> Status: laufend >>>> Persistent: yes >>>> Automatischer Start: yes >>>> Kapazität: 3,54 TiB >>>> Zuordnung: 3,39 TiB >>>> Verfügbar: 155,27 GiB >>>> >>>> Thank you very much >>>> >>>> Lothar Schilling >> >> >

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Re: Storage cleaning
by Lothar Schilling 14 May '20

14 May '20

virsh list --all 15 VM1 running 16 VM2 running ps ax | grep virt 14281 ? Sl 1170:30 /usr/libexec/qemu-kvm -name VM1 [...] 14384 ? Sl 376:45 /usr/libexec/qemu-kvm -name VM2 [...] Am 14.05.2020 um 17:45 schrieb Alvin Starr: > List your storage pool to insure that they have been deleted from the > pool. > If they are not there anymore then check to make sure nothing is > running that would have the VM images open. > > On 5/14/20 11:01 AM, Lothar Schilling wrote: >> Hi everybody, >> >> we have a Centos 6 host with libvirtd 0.10.2. It's holding a storage >> pool of about 3.5 TB with 4 VMs. I decided to rearrange them, so I >> destroyed and undefined two of them. But now I am not able to install >> a new one because virsh gives me an "not enough space left". Those >> two undefined VMs still linger around somehow occupying a lot of that >> storage. How can I get rid of them? >> >> Name: storage >> UUID: 8b25e085-38d8-5a09-f80f-a29150f25d42 >> Status: laufend >> Persistent: yes >> Automatischer Start: yes >> Kapazität: 3,54 TiB >> Zuordnung: 3,39 TiB >> Verfügbar: 155,27 GiB >> >> Thank you very much >> >> Lothar Schilling

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