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[libvirt-users] cgroups inside LXC containers losts memory limits after some time
by mxs kolo 18 Sep '14

18 Sep '14

Hi all I have CentOS Linux release 7.0.1406, libvirt 1.2.7 installed. Just after create and start inside LXC container present cgroups. Example for memory: [root@ce7-t1 /]# ls -la /sys/fs/cgroup/memory/ total 0 drwxr-xr-x 2 root root 0 Sep 15 17:14 . drwxr-xr-x 12 root root 280 Sep 15 17:14 .. -rw-r--r-- 1 root root 0 Sep 15 17:14 cgroup.clone_children --w--w--w- 1 root root 0 Sep 15 17:14 cgroup.event_control -rw-r--r-- 1 root root 0 Sep 15 17:15 cgroup.procs -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.failcnt --w------- 1 root root 0 Sep 15 17:14 memory.force_empty -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.failcnt -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.limit_in_bytes -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.max_usage_in_bytes -r--r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.slabinfo -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.tcp.failcnt -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.tcp.limit_in_bytes -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.tcp.max_usage_in_bytes -r--r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.tcp.usage_in_bytes -r--r--r-- 1 root root 0 Sep 15 17:14 memory.kmem.usage_in_bytes -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.limit_in_bytes -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.max_usage_in_bytes -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.memsw.failcnt -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.memsw.limit_in_bytes -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.memsw.max_usage_in_bytes -r--r--r-- 1 root root 0 Sep 15 17:14 memory.memsw.usage_in_bytes -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.move_charge_at_immigrate -r--r--r-- 1 root root 0 Sep 15 17:14 memory.numa_stat -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.oom_control ---------- 1 root root 0 Sep 15 17:14 memory.pressure_level -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.soft_limit_in_bytes -r--r--r-- 1 root root 0 Sep 15 17:14 memory.stat -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.swappiness -r--r--r-- 1 root root 0 Sep 15 17:14 memory.usage_in_bytes -rw-r--r-- 1 root root 0 Sep 15 17:14 memory.use_hierarchy -rw-r--r-- 1 root root 0 Sep 15 17:14 notify_on_release -rw-r--r-- 1 root root 0 Sep 15 17:14 tasks Command "free" inside LXC showed almost normal values: [root@ce7-t1 /]# free total used free shared buffers cached Mem: 1048576 32972 1015604 4473848 0 -4445364 -/+ buffers/cache: 4478336 -3429760 Swap: 1048576 0 1048576 (some problem with negative values) After unpredictable time passed (1-5 day ?), cgroups inside LXC magicaly removed. "free" in such containers show 2^53-1 as maximum values: [root@puppet01 /]# free total used free shared buffers cached Mem: 9007199254740991 591180 9007199254149811 0 0 267924 -/+ buffers/cache: 323256 9007199254417735 Swap: 0 0 0 And no more any cgroups presented at least in memory category: [root@puppet01 /]# ls -la /sys/fs/cgroup/memory/ total 0 b.r. Maxim Kozin

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[libvirt-users] Using custom QEMU binaries with libvirt
by Joaquim Barrera 18 Sep '14

18 Sep '14

Hi all, I compiled a custom version of QEMU 2.0.0 and I am having hard times to make it available to libvirt. Just to clarify, if I execute /usr/local/bin/qemu-system-x86_64 it does performs good. But when I put this very same path to <emulator> tag in a domain configutation, when i start the domain I get error: Failed to start domain vm1 error: internal error: process exited while connecting to monitor: libvirt: error : cannot execute binary /usr/local/bin/qemu-system-x86_64: Permission denied I tried setting +x permission to all the binaries in /usr/local/bin, disabling apparmor profile for libvirtd, creating and putting to complain a profile for /usr/local/bin/qemu-system-x86_64, creating a softlink to /usr/bin/kvm-spice to the custom binary and leaving <emulator> as default... At the end of http://www.gossamer-threads.com/lists/openstack/dev/40033 I found something about AppArmor, and enabling bios.bin reading somewhere, but I got a little confused here. The most disapointing thing here, is that using qemu 1.7 I could use my custom build, but apparently something changed with 2.0 (or with libvirt integration). Any ideas? Thanks!

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[libvirt-users] VM status when guest poweroff
by Hong-Hua.Yin＠freescale.com 18 Sep '14

18 Sep '14

Hi， I tried QEMU on ARM/PPC platforms. If running poweroff command on guest, it should also shutoff the VM. But it shows the VM status still be 'running' instead of 'shutoff'. I guess it should be qemu issue, is it right? Best Regards, Olivia

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[libvirt-users] qemu:///system and qemu:///session
by navin p 16 Sep '14

16 Sep '14

Hi, I try to connect from virsh -c qemu:///session and it shows the VMs created by by that particular user (testuser). But when i try from root virsh -c qemu:///system i don't see the vms created by testuser. How do i make it appear in the root's virsh ie the vms created by testuser ? I need this because i need information for global VM statistics created by all users. Can someone help me regarding this ? Regards, Navin

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[libvirt-users] virsh's editor configuration
by lejeczek 16 Sep '14

16 Sep '14

hi all where/how to change vim's I presume configuration, one that virsh uses? thanks. P.

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[libvirt-users] grep ip address from KVM DHCP log
by Jianfeng Tang 15 Sep '14

15 Sep '14

> Hi, I plan to use KVM internal network 'default' and grep dhcp log to figure out the IP address that assigned to my VM. I know I can configure static ip but I like to assign ip dynamically to avoid mgmt cost. Does anyone know where the dhcp log is? My KVM host is running Ubuntu Raring (13.04). It does not have file /var/log/daemon.log as some online doc mentioned. Thanks, ~Jianfeng >

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[libvirt-users] Inconsistent behavior between x86_64 and ppc64 when creating guests with NUMA node placement
by Michael Turek 15 Sep '14

15 Sep '14

Hello all, I was recently trying out NUMA placement for my guests on both x86_64 and ppc64 machines. When booting a guest on the x86_64 machine, the following specs were valid (obviously, just notable excepts from the xml): <memory unit='KiB'>8388608</memory> <currentMemory unit='KiB'>8388608</currentMemory> <vcpu placement='static'>4</vcpu> ... <cpu> <topology sockets='4' cores='1' threads='1'/> <numa> <cell cpus='0-2' memory='6144'/> <cell cpus='3' memory='2048'/> </numa> </cpu> However, on ppc64 this causes the following error: error: Failed to create domain from sample_guest.xml error: internal error: early end of file from monitor: possible problem: 2014-09-11T18:44:25.502140Z qemu-system-ppc64: total memory for NUMA nodes (8388608) should equal RAM size (200000000) The 200000000 is actually 8192 MB in bytes and hexidecimal. This is apparently just an issue with the error message. The following specs work on ppc64: <cpu> <topology sockets='4' cores='1' threads='1'/> <numa> <cell cpus='0-2' memory='6291456'/> <cell cpus='3' memory='2097152'/> </numa> </cpu> Note that the memory for each cell is 6144*1024 and 2048*1024 respectively. The issue is that the memory size for each NUMA cell should be specified in KiB, not MB (http://libvirt.org/formatdomain.html#resPartition "|memory| specifies the node memory in kibibyte"). In short, it seems that specifying NUMA cell memory in MB works on x86_64 but not on ppc64. Does anyone have any insight to what's causing this, or if I'm misunderstanding something? Any help is appreciated, thank you! Regards, Michael Turek

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[libvirt-users] ntpd in VM
by Adam King 12 Sep '14

12 Sep '14

----- Original Message ----- From: "Adam King" <kinga(a)sghs.org.uk> To: "Gary Hook" <garyrhook(a)gmail.com> Sent: Friday, September 12, 2014 1:39:38 PM Subject: Re: [libvirt-users] ntpd in VM ----- Original Message ----- From: "Gary Hook" <garyrhook(a)gmail.com> To: libvirt-users(a)redhat.com Sent: Friday, September 12, 2014 1:25:47 PM Subject: Re: [libvirt-users] ntpd in VM While I agree that running a time server in a VM is, at best, problematic, most of those nay-sayers have experience with VMware, xen and the like. Those aren't the only hypervisors out there, and the decision process should depend upon the hypervisor (to a significant degree), not just the idea of "can I do this in a VM?" Not all hypervisors are created equally. On Fri, Sep 12, 2014 at 7:14 AM, Pierre Schweitzer < pierre(a)reactos.org > wrote: Hi, It is still a bad idea. I invite you to read here for the reasons why: http://serverfault.com/a/106509/150152 Cheers, On 09/12/2014 12:51 PM, Mauricio Tavares wrote: > I was taught in kitty school that running a ntp server in a vm > was a bad idea. Is that still the case? > My experience is somewhat different. VMWare has always been problematic with this, especially Linux guests. I've run KVM based NTP servers inside vm's (2 as active:standby) and dozens of ntp clients inside vm's for over a year now and seen no adverse results. Admittedly I've not been checking the drift but I can vouch for the results. Regards Adam King <blockquote> </blockquote>

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[libvirt-users] ntpd in VM
by Mauricio Tavares 12 Sep '14

12 Sep '14

I was taught in kitty school that running a ntp server in a vm was a bad idea. Is that still the case?

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[libvirt-users] trying but failing - pass-through scsi/sata
by lejeczek 11 Sep '14

11 Sep '14

hi everybody I'd imagine this topic must have been covered, yet I've failed to find any really helpful and a solid howto/examples of how to pass-through a sata disks. currently I'm having this in my xml: <hostdev mode='subsystem' type='scsi' managed='no'> <source> <adapter name='scsi_host4'/> <address bus='0' target='0' unit='0'/> </source> <address type='drive' controller='4' bus='0' target='0' unit='0'/> </hostdev> I took it from http://libvirt.org/formatdomain.html#elementsHostDevSubsys yet a Linux guest (SL7) fails to find/detect any disks, if I dumpxml I get this: <device> <name>block_sdb_OCZ_VERTEX4_OCZ_352C77TZVQF1Y3SX</name> <path>/sys/devices/pci0000:00/0000:00:1f.2/ata5/host4/target4:0:0/4:0:0:0/block/sdb</path> <parent>scsi_4_0_0_0</parent> <capability type='storage'> <block>/dev/sdb</block> <bus>ata</bus> <drive_type>disk</drive_type> <model>OCZ-VERTEX4</model> <vendor>ATA</vendor> <serial>OCZ-VERTEX4_OCZ-352C77TZVQF1Y3SX</serial> <size>128035676160</size> <logical_block_size>512</logical_block_size> <num_blocks>250069680</num_blocks> </capability> </device> how do I pass-through sata drives? any help much appreciated, thanks!

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