February 2014 - Users - libvirt List Archives

[libvirt-users] some problem with snapshot by libvirt
by xingxing gao 22 Nov '14

22 Nov '14

Hi,all,i am using libvirt to manage my vm,in these days i am testing the libvirt snapshot ,but meet some problem: the snapshot was created from this command: snapshot-create-as win7 --disk-only --diskspec vda,snapshot=external --diskspec hda,snapshot=no but when i tried to revert from the snapshot which created from the above command ,i got error below: virsh # snapshot-revert win7 1338041515 --force error: unsupported configuration: revert to external disk snapshot not supported yet version: virsh # version Compiled against library: libvir 0.9.4 Using library: libvir 0.9.4 Using API: QEMU 0.9.4 Running hypervisor: QEMU 1.0.93

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[libvirt-users] method for communication between containers
by WANG Cheng D 09 Apr '14

09 Apr '14

Dear all, In my system, two containers need to exchange data as quick as possible and the two containers are hosted by the same physical machine, I wonder if socket is the only method for communication between containers? Thank you. Cheng Wang

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[libvirt-users] Adjust disk image migration (NBD)
by Joaquim Barrera 20 Mar '14

20 Mar '14

Hi all, As I am doing some tests with qemu, I realized that the way it does 'migrate -i tcp:DEST:444' is not the same as 'libvirt migrate --copy-storage-inc'. Basically qemu uses the same stream as RAM migration and libvirt takes advantage of NBD transfer. With virsh migrate-setspeed I observed that one can only control the transfer throughput of RAM, but not disk synchronization. At least this is what I can see in bmon when doing a migration with incremental copy. The question is: Am I missing something or it is not implemented? Thank you guys!

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[libvirt-users] how to disable vnet_hdr through libvirt
by Jianfeng Tang 07 Mar '14

07 Mar '14

Hi, I am using libvirt and virsh to create my VM on KVM. It works fine. However, I need to turn off vnet_hdr for virtio interface. Does anyone know how to do it through libvirt? Thanks.

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[libvirt-users] [libvirt] LXC, user namespaces and systemd
by Dariusz Michaluk 05 Mar '14

05 Mar '14

Hi! I with my colleagues from Samsung trying to run systemd in Linux container. I saw that the others are experimenting in this topic, so I would like to present the results of my work and tests, perhaps it will be helpful to others. As the prototype I used a manual written by Daniel: https://www.berrange.com/posts/2013/08/12/running-a-full-fedora-os-inside-a… After many attempts, I managed to run systemd. Let's move to specifics. 1. Host configuration, Fedora 20 - kernel 3.14 with NAMESPACES, UTS_NS, IPC_NS, USER_NS, PID_NS, NET_NS enabled in kernel config I used kernel-3.14.0-0.rc2.git0.1.fc21.i686.rpm downloaded from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide - libvirtd (libvirt) 1.2.2 I used libvirt build from git sources, it is important that the source contained commit 6fb42d7cdc57da453691d043d6b9bf23e2bae15e Patch from Richard Weinberger "Ensure systemd cgroup ownership is delegated to container with userns" 2. Container configuration - setup Fedora environment # yum -y --releasever=20 --nogpg --installroot=/var/lib/libvirt/filesystems/mycontainer --disablerepo='*' --enablerepo=fedora install systemd passwd yum fedora-release vim-minimal openssh-server procps-ng # echo "pts/0" >> /var/lib/libvirt/filesystems/mycontainer/etc/securetty # chroot /var/lib/libvirt/filesystems/mycontainer /bin/passwd root - In the final solution I want to map root inside container to some normal user in the host. So let's create some user (in host): # useradd foo -u 666 #id foo uid=666(foo) gid=1001(foo) grupy=1001(foo) # chown -R foo:foo /var/lib/libvirt/filesystems/mycontainer - enabling user namespace (user mapping setup), look at my full libvirt config file # cat /etc/libvirt/lxc/container.xml <domain type='lxc'> <name>mycontainer</name> <uuid>d750af59-6082-437c-b860-922e76b46410</uuid> <memory unit='KiB'>819200</memory> <currentMemory unit='KiB'>819200</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='i686'>exe</type> <init>/sbin/init</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <idmap> <uid start='0' target='666' count='1000'/> <gid start='0' target='1001' count='1000'/> </idmap> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount' accessmode='passthrough'> <source dir='/var/lib/libvirt/filesystems/mycontainer'/> <target dir='/'/> </filesystem> <interface type='network'> <mac address='00:16:3e:34:a2:dd'/> <source network='default'/> </interface> <console type='pty'> <target type='lxc' port='0'/> </console> </devices> </domain> 3. Start container # virsh --connect lxc:/// define /etc/libvirt/lxc/container.xml # virsh --connect lxc:/// start mycontainer --console If all login attempts are rejected, please boot host machine with audit=0 # vi /etc/default/grub GRUB_CMDLINE_LINUX=" [...] audit=0 [...]" # grub2-mkconfig -o /boot/grub2/grub.cfg # reboot 4. Problems and solutions a) "Cannot add dependency job for unit display-manager.service, ignoring: Unit display-manager.service failed to load: No such file or directory." Delete or just comment line "Wants=display-manager.service" # cat /usr/lib/systemd/system/default.target [Unit] Description=Graphical Interface Documentation=man:systemd.special(7) Requires=multi-user.target After=multi-user.target Conflicts=rescue.target #Wants=display-manager.service AllowIsolate=yes [Install] Alias=default.target b) [FAILED] Failed to mount Huge Pages File System. See 'systemctl status dev-hugepages.mount' for details. [FAILED] Failed to mount Configuration File System. See 'systemctl status sys-kernel-config.mount' for details. [FAILED] Failed to mount Debug File System. See 'systemctl status sys-kernel-debug.mount' for details. [FAILED] Failed to mount FUSE Control File System. See 'systemctl status sys-fs-fuse-connections.mount' for details. Based on knowledge, which gave Daniel: "When a syscall requires CAP_SYS_ADMIN, for example, the kernel will either use capable(CAP_SYS_ADMIN) which only succeeds in the host, or ns_capable(CAP_SYS_ADMIN) which is allowed to suceed in the container. Different filesystems have differing restrictions, but at this time the vast majority of filesystems require that capable(CAP_SYS_ADMIN) succeeed and thus you can only mount them in the host.", and discussion about "allow some kernel filesystems to be mounted in a user namespace" from: http://comments.gmane.org/gmane.linux.kernel/1525998 I decided to disable mounting this filesystems: # systemctl mask dev-hugepages.mount ln -s '/dev/null' '/etc/systemd/system/dev-hugepages.mount' # systemctl mask sys-kernel-config.mount ln -s '/dev/null' '/etc/systemd/system/sys-kernel-config.mount' # systemctl mask sys-kernel-debug.mount ln -s '/dev/null' '/etc/systemd/system/sys-kernel-debug.mount' # systemctl mask sys-fs-fuse-connections.mount ln -s '/dev/null' '/etc/systemd/system/sys-fs-fuse-connections.mount' c) [FAILED] Failed to start D-Bus System Message Bus. See 'systemctl status dbus.service' for details. Feb 26 09:26:12 localhost.localdomain systemd[1]: Starting D-Bus System Message Bus... Feb 26 09:26:12 localhost.localdomain systemd[20]: Failed at step OOM_ADJUST spawning /bin/dbus-daemon: Permission denied # echo -900 > /proc/20/oom_score_adj /proc/20/oom_score_adj: Permission denied # ls -l /proc/20/oom_score_adj -rw-r--r--. 1 65534 65534 0 Feb 26 10:28 /proc/20/oom_score_adj Regarding to kernel documentation in user namespace local root user (on guest) cannot set the OOM on any value. Set OOM on any value required except CAP_SYS_RESOURCE also full root privileges. To disable OOM support delete or just comment line "OOMScoreAdjust=-900" # cat /usr/lib/systemd/system/dbus.service [Unit] Description=D-Bus System Message Bus Requires=dbus.socket After=syslog.target [Service] ExecStart=/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation ExecReload=/bin/dbus-send --print-reply --system --type=method_call --dest=org.freedesktop.DBus / org.freedesktop.DBus.ReloadConfig #OOMScoreAdjust=-900 5. Final systemd start # virsh --connect lxc:/// start mycontainer --console systemd 208 running in system mode. (+PAM +LIBWRAP +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ) Detected virtualization 'lxc-libvirt'. Welcome to Fedora 20 (Heisenbug)! Failed to install release agent, ignoring: No such file or directory [ OK ] Reached target Remote File Systems. [ OK ] Created slice Root Slice. [ OK ] Created slice User and Session Slice. [ OK ] Created slice System Slice. [ OK ] Created slice system-getty.slice. [ OK ] Reached target Slices. [ OK ] Listening on Delayed Shutdown Socket. [ OK ] Listening on /dev/initctl Compatibility Named Pipe. [ OK ] Reached target Paths. [ OK ] Reached target Encrypted Volumes. [ OK ] Listening on Journal Socket. Mounting POSIX Message Queue File System... Starting Journal Service... [ OK ] Started Journal Service. Starting Create static device nodes in /dev... [ OK ] Reached target Swap. Mounting Temporary Directory... Starting Load/Save Random Seed... [ OK ] Mounted POSIX Message Queue File System. [ OK ] Started Create static device nodes in /dev. [ OK ] Reached target Local File Systems (Pre). [ OK ] Started Load/Save Random Seed. [ OK ] Mounted Temporary Directory. [ OK ] Reached target Local File Systems. Starting Trigger Flushing of Journal to Persistent Storage... Starting Recreate Volatile Files and Directories... [ OK ] Started Trigger Flushing of Journal to Persistent Storage. [ OK ] Started Recreate Volatile Files and Directories. Starting Update UTMP about System Reboot/Shutdown... [ OK ] Started Update UTMP about System Reboot/Shutdown. [ OK ] Reached target System Initialization. [ OK ] Reached target Timers. [ OK ] Listening on D-Bus System Message Bus Socket. [ OK ] Reached target Sockets. [ OK ] Reached target Basic System. Starting OpenSSH server daemon... Starting Permit User Sessions... Starting D-Bus System Message Bus... [ OK ] Started D-Bus System Message Bus. Starting Login Service... [ OK ] Started OpenSSH server daemon. [ OK ] Started Permit User Sessions. Starting Console Getty... [ OK ] Started Console Getty. [ OK ] Reached target Login Prompts. Starting Cleanup of Temporary Directories... [ OK ] Started Cleanup of Temporary Directories. [ OK ] Started Login Service. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Fedora release 20 (Heisenbug) Kernel 3.14.0-0.rc2.git0.1.fc21.i686 on an i686 (console) localhost login: root Password: Last login: Wed Feb 26 09:26:21 on pts/0 -bash-4.2# - verification which namespace is used inside container # ls -l /proc/self/ns/ ipc -> ipc:[4026532341] mnt -> mnt:[4026532338] net -> net:[4026532344] pid -> pid:[4026532342] user -> user:[4026532337] uts -> uts:[4026532339] outside container $ ls -l /proc/self/ns/ ipc -> ipc:[4026531839] mnt -> mnt:[4026531840] net -> net:[4026531956] pid -> pid:[4026531836] user -> user:[4026531837] uts -> uts:[4026531838] I know that no one likes to read long emails , but most is config and logs. I will be grateful for comments and suggestions. Regards. -- Dariusz Michaluk Samsung R&D Institute Poland Samsung Electronics d.michaluk(a)samsung.com

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[libvirt-users] 'virsh capabilities' on Debian Wheezy-amd64 reports different cpu to Wheezy-i386 (on same hardware)
by Struan Bartlett 04 Mar '14

04 Mar '14

Hi On a range of Dell servers containing Intel 64bit processors, 'virsh capabilities' reports the cpu differently on Debian Wheezy-amd64 and Wheezy-i386. The results given by the Wheezy-i386 version seem very wrong (since n270 is an Atom processor). Apart from architecture, the package versions of libvirt-bin are identical: 1.2.1-1~bpo70+1. /usr/share/libvirt/cpu_map.xml files are identical. Is this a known issue? Details for one server are: # cat /proc/cpuinfo| head -n 26 processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 45 model name : Intel(R) Xeon(R) CPU E5-2650L 0 @ 1.80GHz stepping : 7 microcode : 0x70d cpu MHz : 1800.054 cache size : 20480 KB physical id : 0 siblings : 16 core id : 0 cpu cores : 8 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid bogomips : 3600.10 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management: ... </proc/cpuinfo for processors 1..31 snipped here for brevity> # Running Wheezy-amd64 libvirt-bin1.2.1-1~bpo70+1 # virsh capabilities <cpu> <arch>x86_64</arch> <model>SandyBridge</model> <vendor>Intel</vendor> <topology sockets='2' cores='8' threads='2'/> <feature name='pdpe1gb'/> <feature name='osxsave'/> <feature name='dca'/> <feature name='pcid'/> <feature name='pdcm'/> <feature name='xtpr'/> <feature name='tm2'/> <feature name='est'/> <feature name='smx'/> <feature name='vmx'/> <feature name='ds_cpl'/> <feature name='monitor'/> <feature name='dtes64'/> <feature name='pbe'/> <feature name='tm'/> <feature name='ht'/> <feature name='ss'/> <feature name='acpi'/> <feature name='ds'/> <feature name='vme'/> </cpu> # Running Wheezy-i386 libvirt-bin1.2.1-1~bpo70+1 # virsh capabilities <cpu> <arch>x86_64</arch> <model>n270</model> <vendor>Intel</vendor> <topology sockets='2' cores='8' threads='2'/> <feature name='lahf_lm'/> <feature name='lm'/> <feature name='rdtscp'/> <feature name='pdpe1gb'/> <feature name='avx'/> <feature name='osxsave'/> <feature name='xsave'/> <feature name='aes'/> <feature name='tsc-deadline'/> <feature name='popcnt'/> <feature name='x2apic'/> <feature name='sse4.2'/> <feature name='sse4.1'/> <feature name='dca'/> <feature name='pcid'/> <feature name='pdcm'/> <feature name='xtpr'/> <feature name='cx16'/> <feature name='tm2'/> <feature name='est'/> <feature name='smx'/> <feature name='vmx'/> <feature name='ds_cpl'/> <feature name='dtes64'/> <feature name='pclmuldq'/> <feature name='pbe'/> <feature name='tm'/> <feature name='ht'/> <feature name='ss'/> <feature name='acpi'/> <feature name='ds'/> <feature name='pse36'/> </cpu> Kind regards Struan Bartlett -- Struan Bartlett NewsNow Publishing Limited Tel: +44 (0)845 838 8890 Fax: +44 (0)845 838 8898 The UK's #1 News Portal: > www.NewsNow.co.uk <http://www.NewsNow.co.uk> (est. 1998) Also tailored for Mobile: > mobile.NewsNow.co.uk <http://mobile.NewsNow.co.uk/> Now with FREE Personalisation: > Register <http://www.NewsNow.co.uk/register/> Bespoke B2B Internet News Monitoring: > Internet News Monitoring <http://www.newsnow.co.uk/services/newsmonitoring/> Bespoke B2B Headlines for Websites: > Editorial-In-A-Box <http://www.newsnow.co.uk/services/websites/> NewsNow Publishing Limited, trading also as NewsNow.co.uk, is a company registered in England and Wales under company no. 3435857 with registered office The Euston Office, 1 Euston Square, 40 Melton Street, London NW1 2FD

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[libvirt-users] Set a domain name instead of an ip address into tls certificate
by Pasquale Dir 03 Mar '14

03 Mar '14

I tried to set cn=myMachine instead of cn=192.168.1.x and...everything frezees! virsh -c qemu://.../system tries to connect forever. You really need static ip addresses in the cn field?? I think this is an HUGE bug: you are saying to me that each time I change network or ip (because, dear sirs, dhcp exists) I have to generate a whole new couple of certificates?? I hope it is not the case.... regards Pasquale

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[libvirt-users] Mouse events
by lukass.vacek＠seznam.cz 01 Mar '14

01 Mar '14

Hello, I would like to ask if is there any way how to send mouse event to running domain. I am looking for something like a method for handling keyboard events(virDomainSendKey method). Is it implemented yet or is it future todo item(when It will be released?)? Thank for your answer

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[libvirt-users] bridge / ubuntu / no arp reply
by François Chenais 28 Feb '14

28 Feb '14

Hello I'm trying to setup a bridged guest on an ubuntu 13.10 but it doesn't work. (Everything is ok with NAT) Network sniffing shows that arp replies don't come back to the guest. Test 1 ------ Guest : ping host_bridge_ip (ok) Test 2 ------ Guest: ping other_lan_host (KO) other_lan_host - receives arp who-is request - sends arp reply - arp -a shows the guest macaddr => Guest doesn't receive reply Test 3 ------ other_lan_host ping the Guest (KO) - arp -a shows "incomplete" addr - Guest receives nothing On Host ------- network tcpdump on bridge or vnet interfaces shows request but no reply ... Thanks in advance for help or ideas François

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[libvirt-users] POOL of SRIOV networks with multiple PFs
by john fisher 28 Feb '14

28 Feb '14

We are using an Intel 82599 chip that allows 4 PFs ( eth0..3) per VM. I am able to manually start VMs using the hostdev definition for the four network connections, but I'd like to start using the pool approach. Ubuntu 12.04 libvirt 1.0.0 Following: http://wiki.libvirt.org/page/Networking#Assignment_from_a_pool_of_SRIOV_VFs… I can get a pool working with one network- <network> <name>passthrough_eth0</name> <forward mode='hostdev' managed='yes'> <pf dev='eth0'/> </forward> </network> and I can get the four networks started using similar xml. Using one stanza of network type passthrough, I can get a pool on one PF. But when I try to create the VM using four stanzas of network definition, <interface type='network'> <source network='passthrough_eth0'/> </interface> <interface type='network'> <source network='passthrough_eth1'/> </interface> <interface type='network'> <source network='passthrough_eth2'/> </interface> <interface type='network'> <source network='passthrough_eth3'/> </interface> I get this error: "error: Failed to create domain from ./vm0.xml error: internal error Process exited while reading console log output: kvm: -device pci-assign,host=01:10.1,id=hostdev0,configfd=47,bus=pci.0,addr=0x8: Duplicate ID 'hostdev0' for device " Ideas? -- John Fisher

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