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[libvirt-users] fedora 19 + libvirt-1.0.5.9 routing problems
by Patrick Chemla 05 Mar '14

05 Mar '14

Hi, I am an experienced libvirt user on Fedora versions from F15 to F17. I have developped scripts to route trafic from outside on multiple interfaces/multiples IPs to multiple VMs, and back to affect each VM the required external IP address. I have servers with more than hundreds external IPs, and up to 4 VMs, each of them route trafic on different external IPs. I have servers with Fedora F17 which work very fine with this. Now libvirt-1.0.5.9 comes to Fedora 19 with many iptables default rules that refrain me to use my scripts. So I put in /etc/libvirt/hooks /qemu the right rules to get trafic to my VMs, but I can't set trafic back to external with the right external IP. The -j SNAT --to-source ot -j MASQUERADE dont work, are ignored, and I dont see any packet through these rules in iptables -tnat -L POSTROUTING. I used tcpdump to trace packet on the physical server on virbr0 interface and on eth0 interface. I see the packets on outgoing route. But, the ougoing packets are presented to the external interface with the internal address 10.0.0.x instead of the address specified in the -j SNAT rule. Am I the only one in this case? Somebody could help? Thanks Patrick

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[libvirt-users] Flags in java api bindings
by Pasquale Dir 05 Mar '14

05 Mar '14

I am currently using Connect(String,ConnectAuth,int) constructor, as I decided to use tcp connection and I need the auth part. It works, but I still need the read/write flag which, in the Connect(String, boolean) is a boolean. I need to enable write permits. In the javadoc no flags are defined...so which is the flag for allow write? And where can I find a list?

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[libvirt-users] Live migration (kvm) not working if any I/O operation is in progress
by Pasquale Dir 04 Mar '14

04 Mar '14

Hello, I'd like to know if this is an hypervisor related problem or a libvirt one. I did this experiment: on VM I started watching a video on youtube. While video was in progress I started migration. Migration did not complete until video was not finished. I did another experiment: I installed a web server on VM. I then started an httperf stress test. As before migration did not complete until the stress test was closed. Is this normal?

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[libvirt-users] libvirt-sock No such file or directory
by Ram Srivatsa Kannan 04 Mar '14

04 Mar '14

Hi, When I run the following command *~/kvm/virt-manager $ virsh -c qemu:///system list* i get the following errors. Please help me out with this issue. error: failed to connect to the hypervisor error: Failed to connect socket to '/usr/local/var/run/libvirt/libvirt-sock': No such file or directory' Thank you Ram PhD student Dept of EECS UMich

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[libvirt-users] [libvirt] LXC, user namespaces and systemd
by Dariusz Michaluk 04 Mar '14

04 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 03 Mar '14

03 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] What is the best virtual network for my case?
by Pasquale Dir 01 Mar '14

01 Mar '14

I have an openvswitch switch controlled by a controller. I want to have a group of virtual machines which can be on different nodes but sharing the same ip address thus having the illusion of being on the same network. So, each vm I start gets an ip (I was thinking about something like 192.168.y.x 255.255.0.0 where y would be the node and x the vm, this way each node can have its own dhcp server) which is virtual and belongs to the same network of the others. Throught openvswitch I would take care of the communication between different machines if they belong to different phisical networks. So, what is the best network configuration according to you?

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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 27 Feb '14

27 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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