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Description of problem: error: Requested operation is not valid: cgroup memory controller is not mounted [root@localhost network-scripts]# virsh list Id Name State ---------------------------------------------------- 5 a running [root@localhost network-scripts]# virsh memtune a error: Unable to get number of memory parameters error: Requested operation is not valid: cgroup memory controller is not mounted [root@localhost network-scripts]# virsh memtune a --hard-limit 512000 error: Unable to change memory parameters Version-Release number of selected component (plus see additional info) libvirt-python-0.10.2-29.el6_5.2.x86_64 libvirt-client-0.10.2-29.el6_5.2.x86_64 libvirt-0.10.2-29.el6_5.2.x86_64 How reproducible: always Steps to Reproduce: 1. Start a guest 2. Try to apply memtune Actual results: error: Unable to change memory parameters Expected results: >> virsh # list >> Id Name State >> ---------------------------------- >> 4 Fedora_14_x64 running >> >> virsh # memtune Fedora_14_x64 >> hard_limit : 9007199254740991 >> soft_limit : 9007199254740991 >> swap_hard_limit: 9007199254740991 Additional info: Customer faced the issue on RHEL 6.3 libvirt-0.9.10-21.el6_3.4.x86_64 Fri 24 May 2013 10:55:54 AM CEST libvirt-client-0.9.10-21.el6_3.4.x86_64 Fri 24 May 2013 10:55:53 AM CEST libvirt-python-0.9.10-21.el6_3.4.x86_64 Fri 24 May 2013 10:56:54 AM CEST gpxe-roms-qemu-0.9.7-6.9.el6.noarch Wed 15 May 2013 12:10:44 PM CEST qemu-img-0.12.1.2-2.295.el6_3.2.x86_64 Wed 15 May 2013 10:53:26 AM CEST qemu-kvm-0.12.1.2-2.295.el6_3.2.x86_64 Wed 15 May 2013 12:10:45 PM CEST I have reproduced it on RHEL 6.4 [root@localhost network-scripts]# rpm -qa | grep libvirt libvirt-python-0.10.2-29.el6_5.2.x86_64 libvirt-client-0.10.2-29.el6_5.2.x86_64 libvirt-0.10.2-29.el6_5.2.x86_64 [root@localhost network-scripts]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.4 (Santiago) --- rmcswain noted, that it works for him on 6.5
Well the obvious first question here is are cgroups mounted ? Please provide the /proc/mounts content for the machine showing the problem.
Ok, so cgroups is mounted which means what likely happened here is that either libvirtd or the VM, or both were started before the cgroups were mounted. Libvirtd only detects cgroup mounts when it starts up. So if you later mount cgroups you must restart libvirtd and any VMs that were running. So if they can confirm that restarting libvirtd + all VMs makes it work, this this is NOTABUG.
Could you turn on libvirt debug logs (see http://wiki.libvirt.org/page/DebugLogs) and run the following commands # cat /proc/mounts # service libvirtd restart and attach the result of the first command and libvirtd.log with debug logs generated by the second command?
OK, so the log does not mention any cgroup controller to be enabled in qemu configuration and indeed looking at /etc/libvirt/qemu.conf: cgroup_controllers = [ ] In other words, they explicitly disabled all cgroups for qemu driver...