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[libvirt-users] Advice on virtio, or any virtualization solution for hdparm
by Peter Teoh 01 Feb '16

01 Feb '16

At the present moment, my guest is running inside qemu and host is kvm intel, running Ubuntu 14.04, kernel is 4.3.0 stable. From within the guest, when I run "hdparm -i /dev/sdb" on the guest, I get: HDIO_GET_IDENTITY failed: Invalid argument as the error,but on the host, I will get the full harddisk/SSD info. Can I know how to resolve this so that the output is the same for both host and guest? My strace of hdparm from within the guest (just "-e ioctl" is traced): ioctl(3, HDIO_GET_MULTCOUNT, 0x618ef0) = -1 EINVAL (Invalid argument) ioctl(3, SG_IO, {'S', SG_DXFER_FROM_DEV, cmd[16]=[85, 08, 0e, 00, 00, 00, 01, 00, 00, 00, 00, 00, 00, 40, ec, 00], mx_sb_len=32, iovec_count=0, dxfer_len=512, timeout=15000, flags=0, data[512]=["@\0\377?7\310\20\0\0\0\0\0?\0\0\0\0\0\0\0HPAD0409105B"...], status=00, masked_status=00, sb[0]=[], host_status=0, driver_status=0, resid=0, duration=184, info=0}) = 0 ioctl(3, HDIO_GET_IDENTITY, 0x7fffda088500) = -1 EINVAL (Invalid argument) HDIO_GET_IDENTITY failed: Invalid argument +++ exited with 22 +++ And at the host level: ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7ffd4b096d90) = -1 ENOTTY (Inappropriate ioctl for device) ioctl(3, HDIO_GET_MULTCOUNT, 0x618ef0) = -1 ENOTTY (Inappropriate ioctl for device) ioctl(3, SG_IO, {'S', SG_DXFER_FROM_DEV, cmd[16]=[85, 08, 0e, 00, 00, 00, 01, 00, 00, 00, 00, 00, 00, 40, ec, 00], mx_sb_len=32, iovec_count=0, dxfer_len=512, timeout=15000, flags=0, data[512]=["@\0\377?7\310\20\0\0\0\0\0?\0\0\0\0\0\0\0HPAD0409105B"...], status=00, masked_status=00, sb[0]=[], host_status=0, driver_status=0, resid=0, duration=184, info=0}) = 0 ioctl(3, HDIO_GET_IDENTITY, 0x7ffd4b0976e0) = 0 +++ exited with 0 +++ And my qemu command line: sudo ./x86_64-softmmu/qemu-system-x86_64 -m 1024 -boot c -enable-kvm -net nic -net user \ -device virtio-scsi-pci \ -drive if=none,file=/dev/sdb,id=sdb,cache=none,format=raw \ -device scsi-block,drive=sdb \ -hda /home/user/ubuntu1404_x86_64/ubuntu1404_x86_64.img where qemu-system_x86_64 is freshly compiled from latest qemu-devel git tree. I would the SSD (internal SATA) at /dev/sdb to be pass directly into qemu. Please kindly recommend the best solution: distro (CentOS??), kernel version, qemu command like, and setup procedure for libvirtd? or virtio-scsi?

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[libvirt-users] generate interface MAC addresses in a particular order
by Andrei Perietanu 01 Feb '16

01 Feb '16

Hi all, I am using libvirt to manage VM on my system; after creating a VM (default no NICs are present in the configuration) you can add any number of interfaces to it (as long as they exist on the host). To do that, I edit the configuration xlm: vmXml = self.domain.XMLDesc() root = ET.fromstring(vmXml) devices = root.find('./devices') intf = ET.SubElement(devices,'interface') intf.set('type', 'bridge') src = ET.SubElement(intf,'source') src.set('bridge', bIntf) model = ET.SubElement(intf,'model') model.set('type', 'e1000') xml = ET.tostring(root) self.conn.defineXML(xml) Now the problem I have is that the MAC addresses are auto-generated and because of this there is no way to predict which interface number the newly added interface will map to, on the VM. Ideally, the first added interface is mapped to eth0/0, the second one eth0/1...etc. Since the mappings depend on the MAC addresses I figured that is the part I need to have control over. Any ideas? Thanks, Andrei -- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager. Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007. Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.

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[libvirt-users] storage pool and volume usage question
by Paul Carlton 31 Jan '16

31 Jan '16

Hi I'm creating a storage volume in a storage pool (directory type). I'd like to create a volume that creates a file in a sub directory under the directory that the pool points to but am not able to work out how, maybe it is not possible? My pool was created using following xml... <pool type='dir'> <name>nova-local-pool</name> <target> <path>/home/pcarlton/openstack/stuff/instances</path> <permissions> <mode>0755</mode> <owner>1000</owner> <group>130</group> </permissions> </target> </pool> The volume was created using this xml... stgvol_xml = """ <volume> <name>4291f96a-759a-4b8a-bfe2-7a8ccb118b75-disk</name> <allocation>0</allocation> <capacity unit="G">1</capacity> <target> <format type='qcow2'/> <permissions> <owner>1000</owner> <group>130</group> <mode>0644</mode> <label>image_overlay</label> </permissions> </target> <backingStore> <path>/home/pcarlton/openstack/stuff/nova/instances/_base/07f224f72581f8e029e08ff96827d581b2321a7b</path> <format type='raw'/> <permissions> <owner>1000</owner> <group>130</group> <mode>0644</mode> <label>image_base</label> </permissions> </backingStore> </volume>""" All works ok but I'd like the create the 'disk' file in /home/pcarlton/openstack/stuff/nova/instances/4291f96a-759a-4b8a-bfe2-7a8ccb118b75 Thanks -- Paul Carlton Software Engineer Cloud Services Hewlett Packard Enterprise BUK03:T242 Longdown Avenue Stoke Gifford Bristol BS34 8QZ Mobile: +44 (0)7768 994283 Office: +44 (0)117 316 2189 Email: mailto:paul.carlton2@hpe.com irc: paul-carlton2 Hewlett-Packard Enterprise Limited registered Office: Cain Road, Bracknell, Berks RG12 1HN Registered No: 690597 England. The contents of this message and any attachments to it are confidential and may be legally privileged. If you have received this message in error, you should delete it from your system immediately and advise the sender. To any recipient of this message within HP, unless otherwise stated you should consider this message and attachments as "HP CONFIDENTIAL".

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[libvirt-users] virt-viewer and virt-manager problem
by Pascal Legrand 30 Jan '16

30 Jan '16

Hello, here is my problem : i migrated an old debian server, with kvm host and guests vm, on a new one (wheezy to jessie). Everything worked fine on this old server. On the new server, i created a storage pool, copy the qcow2 guests files (from the old server) inside this storage pool, copy the xml guests files (from the old server) to /etc/libvirt/qemu , then virsh define guests and virsh start guests. Every guests works fine. My problem is about virt-viewer and virt-manager when i connect from my station to my kvm host from ssh (ssh -X 192.168.151.248). I cant use virt-manager or virt-user virt-manager display all the guests but i cant display the guest itself or the guest informations virt-viewer open a blanck window when i do vncviewer 192.168.151.248:5906 it works fine then i think the problem come from virt-viewer and virt-manager, but i cant see where is the problem. Does someone could help to solve this problem. Thanks -- Pascal

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[libvirt-users] Zombie processes being created when console buffer is full
by Peter Steele 29 Jan '16

29 Jan '16

We have been researching stuck zombie processes in our libvirt lxc containers. What we found was: 1) Each zombie’s parent was pid 1. init which symlinks to systemd. 2) In some cases, the zombies were launched by systemd, in others the zombie was inherited. 3) While the child is in the zombie state, the parent process (systemd) /proc/1/status shows no pending signals. 4) Attaching gdb to systemd, there was 1 thread and it was waiting in write() and the file being written was /dev/console. This write() to the console never returns. We operated under the assumption that systemd's SIGCHLD handler sets a bit and a foreground thread (the only thread) would see that child processes needed reaping. While the single thread is stuck in write(), the reaping never takes place. So why is write() blocking? The answer seems to be that there is nothing draining the console and eventually it blocks write() when its buffers become full. When we attached to the container's console, the buffer is cleared allowing systemd’s write() to return. The zombies are then reaped and everything goes back to normal. Our “solution” was more of a workaround. systemd was altered to log errors/warnings/etc to /dev/null instead of /dev/console. This prevented the problem, only in that the console buffer was unlikely to get filled up since systemd generally is the only then that writes to it. This is definitely a hack though. This may be a bug in the libvirt container library (you can't expect something to periodically connect to a container's console to empty it out). We suspect there may also be a configuration issue in our containers with regards to the console. Has anyone else observed this problem? Peter

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[libvirt-users] RX dropped packets on guests subnets
by pichon 27 Jan '16

27 Jan '16

Hello, I have first a question (and then may be a problem), that I have difficulties to understand and eventually to investigate. On each of my guests VM, I see constantly a RX dropped number increasing , Even if the VM does nothing ! ifconfig eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.100.15 netmask 255.255.255.0 broadcast 192.168.100.255 inet6 fe80::5054:ff:fe36:ac80 prefixlen 64 scopeid 0x20<link> ether 52:54:00:36:ac:80 txqueuelen 1000 (Ethernet) RX packets 1966 bytes 122391 (119.5 KiB) RX errors 0 dropped 1288 overruns 0 frame 0 TX packets 552 bytes 99939 (97.5 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 0 (Local Loopback) RX packets 4 bytes 340 (340.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 4 bytes 340 (340.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 (1) Is that a normal behaviour ? (2) Could you give me some hints where/how to investigate Here are a number of informations: - The virsh LAN setup - The VM XML description - iptables-save on the hosts - and then some packages version Thanks in advance Patrick My setup is as follow: An host running a Fedora 23 (minimal) and a VM guest running a Fedora 23 I have created 3 Networks , - 2 fully isolated ( mgt-private-lan and pre-private-lan) - 1 Nat via the host NIC Here after are the information related to the nat Network on which I have consistent increase of RX Dropped Packets virsh net-list Name State Autostart Persistent ---------------------------------------------------------- mgt-private-lan active yes yes nat-internet active yes yes prd-private-lan active yes yes virsh net-info nat-internet Name: nat-internet UUID: 4cff86b1-8e63-40be-ac9c-d3dcd405a9d3 Active: yes Persistent: yes Autostart: yes Bridge: virbr1 virsh net-dumpxml nat-internet <network connections='5'> <name>nat-internet</name> <uuid>4cff86b1-8e63-40be-ac9c-d3dcd405a9d3</uuid> <forward dev='eth0' mode='nat'> <nat> <port start='1024' end='65535'/> </nat> <interface dev='eth0'/> </forward> <bridge name='virbr1' stp='on' delay='0'/> <mac address='52:54:00:e4:ec:1b'/> <domain name='nat-internet'/> <ip address='192.168.100.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.100.128' end='192.168.100.254'/> </dhcp> </ip> </network> here is the XML of the VM [root@ks3 boot]# virsh dumpxml Network <domain type='kvm' id='5'> <name>Network</name> <uuid>006ec4e9-028c-4fef-94ec-4e9efbab61ff</uuid> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <vcpu placement='static'>1</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64' machine='pc-i440fx-2.4'>hvm</type> <kernel>/var/lib/libvirt/boot/vmlinuz</kernel> <initrd>/var/lib/libvirt/boot/initramfs.img</initrd> <cmdline>root=/dev/vda selinux=0 audit=0 console=ttyS0 nosplash quiet</cmdline> <boot dev='hd'/> </os> <features> <acpi/> <apic/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>SandyBridge</model> </cpu> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <pm> <suspend-to-mem enabled='no'/> <suspend-to-disk enabled='no'/> </pm> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/vault-storage/network-root'/> <backingStore/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </disk> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/vault-storage/network-bootswap'/> <backingStore/> <target dev='vdb' bus='virtio'/> <alias name='virtio-disk1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </disk> <controller type='usb' index='0' model='ich9-ehci1'> <alias name='usb'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/> </controller> <controller type='usb' index='0' model='ich9-uhci1'> <alias name='usb'/> <master startport='0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0' multifunction='on'/> </controller> <controller type='usb' index='0' model='ich9-uhci2'> <alias name='usb'/> <master startport='2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/> </controller> <controller type='usb' index='0' model='ich9-uhci3'> <alias name='usb'/> <master startport='4'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <controller type='virtio-serial' index='0'> <alias name='virtio-serial0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <interface type='network'> <mac address='52:54:00:36:ac:80'/> <source network='nat-internet' bridge='virbr1'/> <target dev='vnet12'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/5'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/5'> <source path='/dev/pts/5'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/Network.org.qemu.guest_agent.0'/> <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/> <alias name='channel0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='spice' port='5904' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> <video> <model type='cirrus' vram='16384' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/> </memballoon> </devices> </domain> iptables-save # Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016 *nat :PREROUTING ACCEPT [14895:623423] :INPUT ACCEPT [12645:432591] :OUTPUT ACCEPT [123:8518] :POSTROUTING ACCEPT [595:37490] -A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 6514 -j DNAT --to-destination 192.168.100.10:6514 -A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.100.12:80 -A PREROUTING -d 151.80.45.157/32 -p tcp -m tcp --dport 443 -j DNAT --to-destination 192.168.100.12:443 -A POSTROUTING -s 192.168.100.0/24 -d 224.0.0.0/24 -o eth0 -j RETURN -A POSTROUTING -s 192.168.100.0/24 -d 255.255.255.255/32 -o eth0 -j RETURN -A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -p tcp -j MASQUERADE --to-ports 1024-65535 -A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -p udp -j MASQUERADE --to-ports 1024-65535 -A POSTROUTING -s 192.168.100.0/24 ! -d 192.168.100.0/24 -o eth0 -j MASQUERADE COMMIT # Completed on Sat Jan 23 10:49:51 2016 # Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016 *mangle :PREROUTING ACCEPT [1212763:799851388] :INPUT ACCEPT [169753:18403044] :FORWARD ACCEPT [1043010:781448344] :OUTPUT ACCEPT [123913:208199933] :POSTROUTING ACCEPT [1166923:989648277] -A POSTROUTING -o virbr1 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill -A POSTROUTING -o virbr3 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill -A POSTROUTING -o virbr2 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill COMMIT # Completed on Sat Jan 23 10:49:51 2016 # Generated by iptables-save v1.4.21 on Sat Jan 23 10:49:51 2016 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [120960:207745702] -A INPUT -i virbr1 -p udp -m udp --dport 53 -j ACCEPT -A INPUT -i virbr1 -p tcp -m tcp --dport 53 -j ACCEPT -A INPUT -i virbr1 -p udp -m udp --dport 67 -j ACCEPT -A INPUT -i virbr1 -p tcp -m tcp --dport 67 -j ACCEPT -A INPUT -i virbr3 -p udp -m udp --dport 53 -j ACCEPT -A INPUT -i virbr3 -p tcp -m tcp --dport 53 -j ACCEPT -A INPUT -i virbr3 -p udp -m udp --dport 67 -j ACCEPT -A INPUT -i virbr3 -p tcp -m tcp --dport 67 -j ACCEPT -A INPUT -i virbr2 -p udp -m udp --dport 53 -j ACCEPT -A INPUT -i virbr2 -p tcp -m tcp --dport 53 -j ACCEPT -A INPUT -i virbr2 -p udp -m udp --dport 67 -j ACCEPT -A INPUT -i virbr2 -p tcp -m tcp --dport 67 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -m string --string "GET /w00tw00t.at.ISC .SANS." --algo bm --to 70 -j DROP -A INPUT -m set --match-set banned src -j DROP -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 23 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -d 192.168.100.12/32 -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT -A FORWARD -d 192.168.100.12/32 -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A FORWARD -d 192.168.100.10/32 -p tcp -m state --state NEW -m tcp --dport 6514 -j ACCEPT -A FORWARD -d 192.168.100.0/24 -i eth0 -o virbr1 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT -A FORWARD -s 192.168.100.0/24 -i virbr1 -o eth0 -j ACCEPT -A FORWARD -i virbr1 -o virbr1 -j ACCEPT -A FORWARD -o virbr1 -j REJECT --reject-with icmp-port-unreachable -A FORWARD -i virbr1 -j REJECT --reject-with icmp-port-unreachable -A FORWARD -i virbr3 -o virbr3 -j ACCEPT -A FORWARD -o virbr3 -j REJECT --reject-with icmp-port-unreachable -A FORWARD -i virbr3 -j REJECT --reject-with icmp-port-unreachable -A FORWARD -i virbr2 -o virbr2 -j ACCEPT -A FORWARD -o virbr2 -j REJECT --reject-with icmp-port-unreachable -A FORWARD -i virbr2 -j REJECT --reject-with icmp-port-unreachable -A FORWARD -m set --match-set banned src -j DROP -A FORWARD -j REJECT --reject-with icmp-host-prohibited -A OUTPUT -o virbr1 -p udp -m udp --dport 68 -j ACCEPT -A OUTPUT -o virbr3 -p udp -m udp --dport 68 -j ACCEPT -A OUTPUT -o virbr2 -p udp -m udp --dport 68 -j ACCEPT COMMIT # Completed on Sat Jan 23 10:49:51 2016 rpm -qa | grep libvirt libvirt-daemon-driver-nodedev-1.2.18.2-1.fc23.x86_64 libvirt-daemon-driver-storage-1.2.18.2-1.fc23.x86_64 libvirt-daemon-config-network-1.2.18.2-1.fc23.x86_64 libvirt-daemon-1.2.18.2-1.fc23.x86_64 libvirt-daemon-driver-secret-1.2.18.2-1.fc23.x86_64 libvirt-daemon-driver-network-1.2.18.2-1.fc23.x86_64 libvirt-daemon-driver-nwfilter-1.2.18.2-1.fc23.x86_64 libvirt-daemon-driver-qemu-1.2.18.2-1.fc23.x86_64 libvirt-daemon-kvm-1.2.18.2-1.fc23.x86_64 libvirt-client-1.2.18.2-1.fc23.x86_64 libvirt-daemon-driver-interface-1.2.18.2-1.fc23.x86_64 rpm -qa | grep qemu qemu-common-2.4.1-5.fc23.x86_64 qemu-kvm-2.4.1-5.fc23.x86_64 qemu-img-2.4.1-5.fc23.x86_64 ipxe-roms-qemu-20150407-3.gitdc795b9f.fc23.noarch libvirt-daemon-driver-qemu-1.2.18.2-1.fc23.x86_64 qemu-system-x86-2.4.1-5.fc23.x86_64 rpm -qa | grep kvm qemu-kvm-2.4.1-5.fc23.x86_64 libvirt-daemon-kvm-1.2.18.2-1.fc23.x86_64

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[libvirt-users] starting a domain only when you have enough resources
by Andrei Perietanu 27 Jan '16

27 Jan '16

Hi all, I am running KVM on a 3.18 kernel. The system runs and Atom processor with 2Gb RAM. Using KVM you obviously can over allocate your resources: say you have 4 guests each configured with 1GB ram. Running all four at the same time, depending on the workload, can crash the system - I get a kernel trace when this happens. But let's consider a simpler case: one guest with 1.5 Gb RAM, ubuntu 14.03. During the installation the system will again crash. The memory statistics (top or proc/meminfo) will show that the FreeMemory goes down to 12Mb when this happens - which kind of makes sense considering the host will require some RAM to run. But the question is: does libvirt offer any way to prevent this from happening? Some way of not allowing the user to start a guest unless you have enough free memory. I know how much ram each guest has configured but that is not enough. I need to know how much the system has available, and just reading the free memory statistic does not help much since that is only a snapshot - when running a guest you can have 1gb free now, and 10 mb free 2 min later. Any ideas? Thanks, Andrei -- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager. Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007. Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.

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[libvirt-users] Remote Vbox connection to windows host
by Pavlo Shchelokovskyy 26 Jan '16

26 Jan '16

Hi all, I'd like to use libvirt to control/have access to virtual machines created with VirtualBox _on a Windows host_ (from the Linux guest of the same Windows-hosted VirtualBox). It is for testing purposes only,, so security does not matter much. Is it possible at all? I have some troubles understanding the note in bold at https://libvirt.org/drvvbox.html. Does that mean that one has to have a (running) libvirt daemon on the same host where VirtualBox is running to have a remote connection to this hypervizor with libvirt? Best regards, -- Dr. Pavlo Shchelokovskyy Senior Software Engineer Mirantis Inc www.mirantis.com

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[libvirt-users] Adding a Virtio Serial Controller
by Jean-Pierre Ribeauville 22 Jan '16

22 Jan '16

H, As I want to add a channel device programmatically via libvirt API , I got an error due to the fact that the Guest has no VirtIO Serial Controller in its configuration. Is it possible to add it via libvirt API ? Thx for help. Regards, J.P. Ribeauville P: +33.(0).1.47.17.20.49 . Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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[libvirt-users] executing libvirt commands as a different user
by Andrei Perietanu 21 Jan '16

21 Jan '16

I am using the libvirt API to manage VMs on the system, using a python wrapper to execute commands. I need to allow a webserver to access these commands and mostly read information about the VMs. The problem is that when using the web interface you use are basically running the commands as different user. Since libvirtd is run as root by default you get permission errors. Is there any way of getting around this without using polkit? Thanks, Andrei -- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager. Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007. Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.

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