February 2014 - Users - libvirt List Archives

[libvirt-users] libvirt crashes with Caught Segmentation violation
by Minami Katsumata 14 Feb '14

14 Feb '14

Hi, I'm having problems with libvirt crashing after a couple hours when a specific domain monitoring program is running. I have pasted below the following: 1. libvirt version 2. qemu-kvm version 3. OS version 4. Kernel version 5. libvirt status post-crash 6. libvirtd.log (info level dump around crash; too long to post everything so just the beginning and end. UTC) 7. custom.log (on what this domain monitoring program was doing around the time of the crash. JST) 8. FYI on the program being executed 9. other related server settings Please, if anyone can look through these and give some insight as to what is causing libvirt to crash, that would be greatly appreciated. 1.) libvirt version: # rpm -q libvirt libvirt-0.9.10-21.el6.x86_64 2.) qemu-kvm version: qemu-kvm-0.12.1.2-3.295.el6.10.x86_64 3.) OS version: # cat /etc/redhat-release CentOS release 6.3 (Final) 4.) Kernel version: # uname -r 2.6.32-279.22.1.el6.x86_64 5.) libvirt status after crash: # service libvirtd status libvirtd dead but pid file exists 6.) libvirtd.log 2014-02-06 10:25:05.173+0000: 1187: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58626,uid:0 2014-02-06 10:25:05.237+0000: 1184: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58636,uid:0 2014-02-06 10:25:05.271+0000: 1185: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58646,uid:0 2014-02-06 10:25:05.301+0000: 1184: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58648,uid:0 2014-02-06 10:25:05.400+0000: 1184: info : remoteDispatchAuthList:2091 : Bypass polkit auth for privileged client pid:58650,uid:0 Caught Segmentation violation dumping internal log buffer: ====== start of log ===== ^(a)05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=19 w=21, f=32 e=25 d=0 2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=20 w=22, f=34 e=25 d=0 2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=21 w=23, f=33 e=25 d=0 2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=22 w=24, f=36 e=25 d=0 2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=23 w=25, f=38 e=25 d=0 2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=24 w=26, f=39 e=25 d=0 2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=25 w=27, f=41 e=25 d=0 2014-02-06 10:25:05.412+00001182: debug : virEventPollMakePollFDs:383 : Prepare n=26 w=28, f=40 e=25 d=0 (cut out due to length) 2014-02-06 10:25:05.423+00001182: debug : virEventPollDispatchHandles:488 : EVENT_POLL_DISPATCH_HANDLE: watch=2791 events=2 2014-02-06 10:25:05.423+00001182: debug : virNetMessageFree:75 : msg=0x2326a20 nfds=0 cb=(nil) 2014-02-06 10:25:05.423+00001182: debug : virNetServerClientCalculateHandleMode:137 : tls=(nil) hs=-1, rx=0x2266390 tx=(nil) 2014-02-06 10:25:05.423+00001182: debug : virNetServerClientCalculateHandleMode:167 : mode=1 2014-02-06 10:25:05.423+00001182: debug : virEventPollUpdateHandle:151 : EVENT_POLL_UPDATE_HANDLE: watch=2791 events=1 2014-02-06 10:25:05.423+00001182: debug : virEventPollInterruptLocked:702 : Skip interrupt, 1 -1675536288 2014-02-06 10:25:05.423+00001182: debug : virEventPollDispatchHandles:474 : i=33 w=2793 2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupTimeouts:506 : Cleanup 12 2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupHandles:554 : Cleanup 34 2014-02-06 10:25:05.423+00001182: debug : virNetServerClientClose:632 : client=0x22e6860 refs=3 2014-02-06 10:25:05.423+00001182: debug : virKeepAliveStop:382 : RPC_KEEPALIVE_STOP: ka=0x225bf20 client=0x22e6860 2014-02-06 10:25:05.423+00001182: debug : virEventPollRemoveTimeout:293 : EVENT_POLL_REMOVE_TIMEOUT: timer=8290 2014-02-06 10:25:05.423+00001182: debug : virEventPollInterruptLocked:702 : Skip interrupt, 0 -1675536288 2014-02-06 10:25:05.423+00001182: debug : virEventPollRemoveTimeout:293 : EVENT_POLL_REMOVE_TIMEOUT: timer=8289 2014-02-06 10:25:05.423+00001182: debug : virEventPollInterruptLocked:702 : Skip interrupt, 0 -1675536288 2014-02-06 10:25:05.423+00001182: debug : virKeepAliveFree:304 : RPC_KEEPALIVE_FREE: ka=0x225bf20 client=0x22e6860 refs=3 2014-02-06 10:25:05.423+00001182: debug : daemonRemoveAllClientStreams:493 : stream=(nil) 2014-02-06 10:25:05.423+00001182: debug : virEventPollRemoveHandle:180 : EVENT_POLL_REMOVE_HANDLE: watch=2791 2014-02-06 10:25:05.423+00001182: debug : virEventPollRemoveHandle:193 : mark delete 32 50 2014-02-06 10:25:05.423+00001182: debug : virEventPollInterruptLocked:702 : Skip interrupt, 0 -1675536288 2014-02-06 10:25:05.423+00001182: debug : virNetMessageFree:75 : msg=0x2266390 nfds=0 cb=(nil) 2014-02-06 10:25:05.423+00001182: debug : virNetSocketFree:722 : RPC_SOCKET_FREE: sock=0x22e66a0 refs=2 2014-02-06 10:25:05.423+00001182: debug : virNetServerClientFree:591 : RPC_SERVER_CLIENT_FREE: client=0x22e6860 refs=3 2014-02-06 10:25:05.423+00001182: debug : virEventRunDefaultImpl:244 : running default event implementation 2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupTimeouts:506 : Cleanup 12 2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupTimeouts:519 : EVENT_POLL_PURGE_TIMEOUT: timer=8289 2014-02-06 10:25:05.423+00001182: debug : virKeepAliveFree:304 : RPC_KEEPALIVE_FREE: ka=0x225bf20 client=0x22e6860 refs=2 2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupTimeouts:519 : EVENT_POLL_PURGE_TIMEOUT: timer=8290 2014-02-06 10:25:05.423+00001182: debug : virKeepAliveFree:304 : RPC_KEEPALIVE_FREE: ka=0x225bf20 client=0x22e6860 refs=1 2014-02-06 10:25:05.423+00001182: debug : virNetServerClientFree:591 : RPC_SERVER_CLIENT_FREE: client=0x22e6860 refs=2 2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupHandles:554 : Cleanup 34 2014-02-06 10:25:05.423+00001182: debug : virEventPollCleanupHandles:567 : EVENT_POLL_PURGE_HANDLE: watch=2791 2014-02-06 10:25:05.423+00001182: debug : virNetServerClientFree:591 : RPC_SERVER_CLIENT_FREE: client=0x22e6860 refs=1 2014-02-06 10:25:05.423+00001182: debug : virConnectClose:1462 : conn=0x7f1b380c4630 2014-02-06 10:25:05.423+00001182: debug : virUnrefConnect:145 : unref connection 0x7f1b380c4630 1 2014-02-06 10:25:05.423+00001182: debug : virReleaseConnect:94 : release connection 0x7f1b380c4630 ====== end of log ===== 7.) custom.log Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh domifstat i-8-114-VM Interf ace Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh domifstat i-8-114-VM vnet4 Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh list --all Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh domiflist i-8-114-VM Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh domifstat i-8-114-VM Interf ace Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh domifstat i-8-114-VM vnet4 Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh list --all Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh list --all Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so Feb 6 19:25:05 jp7-rk90000 [authpriv.notice] sudo: zabbix : TTY=unknown ; PWD=/etc/zabbix/sender_scripts/compute ; USER=root ; COMMAND=/usr/bin/virsh list --all Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory Feb 6 19:25:05 jp7-rk90000 [authpriv.err] sudo: PAM adding faulty module: /lib64/security/pam_fprintd.so 8.) FYI on this program: This program consists of three main scripts that are run via cron. 2 run every 5 minutes, and 1 runs every minute. The two scripts that are executed every 5 minutes rely heavily on the virsh command. However, it is made so that the simultaneous number of connections to libvirt is not too large; the max number of libvirt-sock connections at any given moment does not go over 6. As it is a domain monitoring program, it only executes the following virsh commands: virsh list --all virsh dominfo virsh domblklist virsh domblkstat virsh domiflist virsh domifstat 9.) other related server settings 9-1) user resource limits [root@ ~]# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 773493 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 32768 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited 9-2) libvirtd.conf The following settings have been changed: #max_clients = 20 max_clients = 250 #max_workers = 20 max_workers = 250 #max_requests = 20 max_requests = 250 Regards, Minami

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[libvirt-users] F20 Virt-Manager with MacVTap not working
by John Obaterspok 13 Feb '14

13 Feb '14

Hello, I've setup a VM with default networking (NAT) and this works fine but hosts on my LAN can't get to the VM since it uses NAT. When I try to set network to use MacVTap with either default or bridged I get no networking for the VM. Any hints around this? I would like to have the VM's on the same LAN as my host and other machines. I don't care if the VM host can't reach the guests. It did work find in F19 but there I believe I had more MacVtap devices to choose from. -- john

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[libvirt-users] Help? Running into problems with migrateToURI2() and virDomainDefCheckABIStability()
by Chris Friesen 13 Feb '14

13 Feb '14

Hi, We've run into a problem with libvirt 1.1.2 and are looking for some comments on whether this is a bug or design intent. We're trying to use migrateToURI() but we're using a few things (numatune, vcpu mask, etc.) that may need adjustment during the migration. We found that migrateToURI2() mostly works if we use XML created by copying the domain XML from the running instance and modifying the appropriate sections. The problem that we're seeing is that the serial console checking in libvirt/src/conf/domain_conf.c::virDomainDefCheckABIStability() is failing even though we haven't touched the serial console XML: 2014-02-10 19:41:07.196 1264 ERROR nova.virt.libvirt.driver [-] [instance: 42a841a8-034f-4565-937e-adb396a2ec48] Live Migration failure: unsupported configuration: Target domain console count 1 does not match source 0 On occasion it passes if the devices/serial/source element happens to be the same after migration, but this seems to be a fluke. If we remove the devices/serial/source element in the XML it seems to make the serial console check work on the first migration, but upon doing subsequent migration it fails with a console count error: 2014-02-07 16:11:32.459 28759 ERROR nova.virt.libvirt.driver [-] [instance: 1d7c470d-4337-450a-8a40-d0fb375ca2c1] Live Migration failure: unsupported configuration: Target domain console count 0 does not match source 1 Are we doing something wrong? Is there an issue with the console check code? Is there a better way to do what we're trying to do? Any help would be appreciated... Thanks, Chris

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[libvirt-users] Can you verify currently defined libvirt secret provides valid Cephx auth?
by Scott Sullivan 12 Feb '14

12 Feb '14

As the subject suggests, I am wondering if its possible to verify if the currently defined libvirt secret provides valid authentication via Cephx to a Ceph cluster? I ask because ideally I would like to verify that the given cephx credentials in my libvirt secret are valid before I even attempt the virsh attach-device on the domain. I tried searching for a solution to this, but I can't seem to find a way to _just_ check if the currently defined libvirt secret provides valid authentication to the Ceph cluster or not. Is this possible?

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[libvirt-users] LXC container driver
by arnaud gaboury 12 Feb '14

12 Feb '14

Dear all, I am slowly building a Arch Linux VM guest on my Arch Linux host. The guest machine is now built and is recognized as shown by this command : gabx@hortensia ➤➤ ~ % machinectl list MACHINE CONTAINER SERVICE dahlia container nspawn 1 machines listed. I an following the libvirt.org documentation. Now, according this page[1] about lxc driver, i am dealing with namespace requirements. This sentence, in bold, puzzles me: A suitably configured UID/GID mapping is a pre-requisite to making containers secure, in the absence of sVirt confinement. If I understand what a namespace is, I have no idea how to make sure my UIG/GID mapping is well configured. I would appreciate having any hints abut this part of the settings. Another question : is there any advantage/disadvantage using the lxc Userspace tools[2] instead of libvirt to manage these namespaces ? Thank you for help. [1]http://libvirt.org/drvlxc.html [2]http://linuxcontainers.org/

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[libvirt-users] Connection from host to lxc container dbus
by Piotr Bartosiewicz 12 Feb '14

12 Feb '14

Hi, I am unsuccessfully trying to connect from host to containers dbus. Inside container dbus socket file is visible as /run/dbus/system_bus_socket. The problem is that /run is mounted as tmpfs in container (by systemd on container) and thus the directory content is not visible outside the container. Is there any way to make this file visible also outside the container? Regards, Piotrek

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[libvirt-users] SR-IOV: no traffic isolation between VFs with Broadcom 10Gbps cards
by Yoann Juet 11 Feb '14

11 Feb '14

Hi all, I'm testing on debian/unstable SR-IOV feature with Broadcom BCM57810 cards and KVM hypervisor: Compiled against library: libvirt 1.2.1 Using library: libvirt 1.2.1 Using API: QEMU 1.2.1 Running hypervisor: QEMU 1.7.0 bnx2x -> firmware 7.8.17 -> driver from kernel 3.12.7 8 VFs are created on the first PF. For each VF, a specific mac address is set manually using "ip link set eth0 vf x mac xx:xx:xx:xx:xx" command. I run several KVM guests with PCI passthrough (same kernel, bnx2x driver and firmware as the host), performance is close to bare metal. Well, that sounds good, until I start capturing the traffic inside each VM: host traffic is visible as well as traffic destined to other VM. It's like if internal card switching was inoperable. I made several tests with different kernels, different PCIe Passthrough method assignments for libvirt. All failed. Has anyone successfully experiment SR-IOV with Broadcom cards on linux ? ----- Some details: 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet (rev 10) 01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet (rev 10) 01:09.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.2 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.3 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.4 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.5 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.6 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function 01:09.7 Ethernet controller: Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function # virsh nodedev-dumpxml pci_0000_01_09_0 <device> <name>pci_0000_01_09_0</name> <path>/sys/devices/pci0000:00/0000:00:01.0/0000:01:09.0</path> <parent>pci_0000_00_01_0</parent> <driver> <name>vfio-pci</name> </driver> <capability type='pci'> <domain>0</domain> <bus>1</bus> <slot>9</slot> <function>0</function> <product id='0x16af'>NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function</product> <vendor id='0x14e4'>Broadcom Corporation</vendor> <capability type='phys_function'> <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/> </capability> <iommuGroup number='35'> <address domain='0x0000' bus='0x01' slot='0x09' function='0x0'/> </iommuGroup> </capability> </device> # virsh nodedev-dumpxml pci_0000_01_09_1 <device> <name>pci_0000_01_09_1</name> <path>/sys/devices/pci0000:00/0000:00:01.0/0000:01:09.1</path> <parent>pci_0000_00_01_0</parent> <driver> <name>vfio-pci</name> </driver> <capability type='pci'> <domain>0</domain> <bus>1</bus> <slot>9</slot> <function>1</function> <product id='0x16af'>NetXtreme II BCM57810 10 Gigabit Ethernet Virtual Function</product> <vendor id='0x14e4'>Broadcom Corporation</vendor> <capability type='phys_function'> <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/> </capability> <iommuGroup number='36'> <address domain='0x0000' bus='0x01' slot='0x09' function='0x1'/> </iommuGroup> </capability> </device> Guest A XML: ... <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x01' slot='0x09' function='0x0'/> </source> </hostdev> ... Guest B XML: ... <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x01' slot='0x09' function='0x1'/> </source> </hostdev> ... -- Université de Nantes - Direction des Systèmes d'Information

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[libvirt-users] libvirt 1.2.1 / lxc : default virtual network not defined after installing/starting Libvirt
by Mohamed Amine Larabi 11 Feb '14

11 Feb '14

Hi There, I am using Libvirt 1.2.1 on Fedora 20. So, Libvirt is well installed and started but the weird thing is that the 'default' virtual network is not automatically defined and started, knowing that I can define/start it manually and everything goes fine. previously I was using libvirt 1.0.4 and the 'default' virtual network was defined/started at Libvirt startup. so, I am wondering if this new behavior was introduced intentionally in the latest versions of Libvirt or it's a known issue. Thank you in advance for your help. Regards Mohamed.

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[libvirt-users] event-test.py cannot detects domain shutdown
by Kim Larry 10 Feb '14

10 Feb '14

Hi, I used event-test.py from here: http://libvirt.org/git/?p=libvirt-python.git;a=blob;f=examples/event-test.p… which is very lasted version. However, it detects all of events but not domain shutdown. I've searched through Google and got nothing. libvirtd version is 1.1.4 and using Xen for hypervisor. Any ideas? Larry

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[libvirt-users] libvirt/qemu and cgroups
by arnaud gaboury 10 Feb '14

10 Feb '14

Dear list, I am building a Arch server on my Arch box. My tools are QEMU/KVM and libvirt to manage the guest, systemd as system manager. I am looking at implementing the Linux Control Groups facilities for resource management. Even after long hours of reading, I am not quite sure about how to deal with the cgroups facilities. First, do I really need to care about all that, or libvirt and systemd will manage the resource in an efficient way right out of the box? If not, It's all about /etc/cgconfig.conf and cgrules.conf. I am honestly not sure : -what are the correct mount points for cpu, memory etc in the /sys/fs/cgroup directory . - which directories am I supposed to mk, if any ? Then, Archwiki[1] says: # cgcreate -a $USER -g memory,cpu:groupname - what is the groupename I shall create (qemu*, MyMachine) ? - which $USER shall I use (qemu*, my username) ? * qemu:qemu as user:group in /etc/libvirt/qemu.conf Thank you for some help as I admit if I understand the cgroups principle and advantages, I am far from understanding how to create such a group in case of a VM. [1]https://wiki.archlinux.org/index.php/Cgroups

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