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1612 discussions

Nested KVM issue
by Laurentiu Soica 23 Aug '16

23 Aug '16

Hello, I have an OpenStack setup in virtual environment on CentOS 7. The baremetal has *nested KVM* enabled and 1 compute node as a VM. Inside the compute node I have multiple VMs running. After about every 3 days the VMs get inaccessible and the compute node reports high CPU usage. The qemu-kvm process for each VM inside the compute node reports full CPU usage. Please help me with some hints to debug this issue. Thanks, Laurentiu

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Updating PXE documentation for CentOS wiki
by Nico Kadel-Garcia 20 Aug '16

20 Aug '16

I was just looking at the CentOS Wiki at https://wiki.centos.org/HowTos/PXE/PXE_Setup, and it's pretty seriously out of date. It neglects the existence of the "syslinux-tftpboot" RPM, and the hand editing of xinetd config files for tftpd ignores the availability of "chkconfig" and "service" to manage that service. For more sophisticated users, it doesn't mention "never, never, never set your default menu to install an OS by default, because you *will* accidentally wipe servers that select PXE boot first before local disk as their boot media". Nor does it mention the difficulties with PXE and NAT based virtual host, nor how to verify the TFTP service's basic operation, nor the difficulty of maintaining multiple PXE configs when the main rsync mirrors only publish the most recent CentOS. I'm happy to add that sort of thing to the wiki, but I'm finding the "Set up an account" page confusing. Is "FirstnameLastname" supposed to be your mandated login name?

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qemu-kvm-ev-2.3.0-31.el7_2.21.1 available for testing on x86_64, ppc64le and aarch64
by Sandro Bonazzola 19 Aug '16

19 Aug '16

qemu-kvm-ev-2.3.0-31.el7_2.21.1 has been tagged for testing for CentOS Virt SIG and is already in testing repositories. It's now available for x86_64, ppc64le and aarch64. Please help testing and providing feedback, thanks. We plan to move to stable repo around Wednesday next week. ChangeLog since previous release: * Fri Aug 19 2016 Sandro Bonazzola <sbonazzo(a)redhat.com> - ev-2.3.0-31.el7_2.21 - Removing RH branding from package name * Tue Aug 02 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.21 - kvm-block-iscsi-avoid-potential-overflow-of-acb-task-cdb.patch [bz#1358997] - Resolves: bz#1358997 (CVE-2016-5126 qemu-kvm-rhev: Qemu: block: iscsi: buffer overflow in iscsi_aio_ioctl [rhel-7.2.z]) * Wed Jul 27 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.20 - kvm-virtio-error-out-if-guest-exceeds-virtqueue-size.patch [bz#1359731] - Resolves: bz#1359731 (EMBARGOED CVE-2016-5403 qemu-kvm-rhev: Qemu: virtio: unbounded memory allocation on host via guest leading to DoS [rhel-7.2.z]) * Wed Jul 20 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.19 - kvm-qemu-sockets-use-qapi_free_SocketAddress-in-cleanup.patch [bz#1354090] - kvm-tap-use-an-exit-notifier-to-call-down_script.patch [bz#1354090] - kvm-slirp-use-exit-notifier-for-slirp_smb_cleanup.patch [bz#1354090] - kvm-net-do-not-use-atexit-for-cleanup.patch [bz#1354090] - Resolves: bz#1354090 (Boot guest with vhostuser server mode, QEMU prompt 'Segmentation fault' after executing '(qemu)system_powerdown') * Fri Jul 08 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.18 - kvm-vhost-user-disable-chardev-handlers-on-close.patch [bz#1351892] - kvm-char-clean-up-remaining-chardevs-when-leaving.patch [bz#1351892] - kvm-sockets-add-helpers-for-creating-SocketAddress-from-.patch [bz#1351892] - kvm-socket-unlink-unix-socket-on-remove.patch [bz#1351892] - kvm-char-do-not-use-atexit-cleanup-handler.patch [bz#1351892] - Resolves: bz#1351892 (vhost-user: A socket file is not deleted after VM's port is detached.) * Tue Jun 28 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.17 - kvm-vhost-user-set-link-down-when-the-char-device-is-clo.patch [bz#1348593] - kvm-vhost-user-fix-use-after-free.patch [bz#1348593] - kvm-vhost-user-test-fix-up-rhel6-build.patch [bz#1348593] - kvm-vhost-user-test-fix-migration-overlap-test.patch [bz#1348593] - kvm-vhost-user-test-fix-chardriver-race.patch [bz#1348593] - kvm-vhost-user-test-use-unix-port-for-migration.patch [bz#1348593] - kvm-vhost-user-test-fix-crash-with-glib-2.36.patch [bz#1348593] - kvm-vhost-user-test-use-correct-ROM-to-speed-up-and-avoi.patch [bz#1348593] - kvm-tests-append-i386-tests.patch [bz#1348593] - kvm-vhost-user-add-ability-to-know-vhost-user-backend-di.patch [bz#1348593] - kvm-qemu-char-add-qemu_chr_disconnect-to-close-a-fd-acce.patch [bz#1348593] - kvm-vhost-user-disconnect-on-start-failure.patch [bz#1348593] - kvm-vhost-net-do-not-crash-if-backend-is-not-present.patch [bz#1348593] - kvm-vhost-net-save-restore-vhost-user-acked-features.patch [bz#1348593] - kvm-vhost-net-save-restore-vring-enable-state.patch [bz#1348593] - kvm-test-start-vhost-user-reconnect-test.patch [bz#1348593] - Resolves: bz#1348593 (No recovery after vhost-user process restart) -- Sandro Bonazzola Better technology. Faster innovation. Powered by community collaboration. See how it works at redhat.com

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how to enable auto-start on newer versions of Xen ?
by Craig Thompson 16 Aug '16

16 Aug '16

Hello, In days past, all I had to do was create /etc/xen/auto and put a symlink in there to the config file for each VM I wanted to have started automatically. Since updating to 4.6, this doesn't work. Period. I'm having a hard time finding what needs to change in order to get VMs to auto start on reboot of a server. Can someone please point me to documentation that I have missed or share the gold nugget? -- Craig Thompson, President Caldwell Global Communications, Inc.

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Downgrading from Xen 4.6 to 4.5
by Francis Greaves 08 Aug '16

08 Aug '16

Dear All I have an up to date CentOS 7 with Xen 4.6 I have noticed in some posts here and there that PCI Passthrough is not working in 4.6 for some people, but is working in 4.5 How can I downgrade to Xen 4.5 so I can test this out? Many thanks Francis

3 3

Centos 7 newer kernel needed
by Laurentiu Soica 05 Aug '16

05 Aug '16

Hello, I am looking for a Linux kernel for Centos 7 that implements a feature introduced in kernel version 3.12: "nested EPT support to KVM's nested VMX." If anyone has used this feature with Centos 7, please let me know. Laurentiu

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Lost a NIC on start
by Günther J. Niederwimmer 04 Aug '16

04 Aug '16

Hello, CentOS 7.2 I have a big Problem with libvirt or KVM, my Virtual Hosts lost sometime a NIC on start. I have configured 4 NIC on the Virtual host two passthru and 2 virtual, on start most time i lost a virtual NIC :-( So after a reboot I have to check always is all running and working.? with a "virsh reboot xxxx" in the most time it come back ? Have any a Idea why ? I found nothing in the Logs :-(. -- mit freundlichen Grüßen / best regards, Günther J. Niederwimmer

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Why does AWS instance always lost around 500MB memory
by Dũng Trần-Dương 02 Aug '16

02 Aug '16

Hi, I launched an AWS instance `t2.medium` (use CentOS 7 image "ami-7abd0209", product code: https://aws.amazon.com/marketplace/pp/B00O7WM7QW) which is supposed to have 4GB Memory in total, but turn out it is only "3.5GB". ``` $ free -h total used free shared buff/cache available Mem: 3.5G 441M 1.4G 16M 1.6G 2.7G Swap: 0B 0B 0B ``` It does not happen to AWS Ubuntu 16.04. ``` $ free -h total used free shared buff/cache available Mem: 3.9G 49M 3.3G 5.5M 518M 3.7G Swap: 0B 0B 0B ``` This seems to happen to all AWS CentOS image, regardless which instance type it is.

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Updated Xen packages available
by George Dunlap 26 Jul '16

26 Jul '16

Due to the nature of XSA-182, we built binaries privately and pushed the signed binaries out as soon as the embargo lifted. Everyone is urged to update as soon as possible. -George

1 0

Cannot allocate Memory
by Shaun Reitan 25 Jul '16

25 Jul '16

Any of you guys ever seen an issue with Xen 4.4 were xm cannot create a guest because of what looks like an issue allocating memory even though xm info shows like 5x the amount of free memory needed? We are still unfortunately still using xm... it's on my list, i know.. We've had this happen on a couple hosts now. Only way to resolve seams to be rebooting the host. I'm going to update the host to latest Xen 4.4 now hoping this is a old bug. Here's from xen logs [2016-06-22 09:13:50 1958] DEBUG (XendDomainInfo:105) XendDomainInfo.create(['vm', ['name', 'xxx'], ['memory', 2048], ['on_xend_start', 'ignore'], ['on_xend_stop', 'ignore'], ['vcpus', 2], ['oos', 1], ['image', ['linux', ['kernel', '/kernels/vmlinux-2.6.18.8-4'], ['videoram', 4], ['args', 'root=/dev/xvda ro xencons=tty console=tty1 '], ['tsc_mode', 0], ['nomigrate', 0]]], ['s3_integrity', 1], ['device', ['vbd', ['uname', 'phy:vg/fs_6818'], ['dev', 'xvda'], ['mode', 'w']]], ['device', ['vbd', ['uname', 'phy:vg/fs_6819'], ['dev', 'xvdb'], ['mode', 'w']]], ['device', ['vif', ['rate', '40mb/s'], ['mac', 'FE:FD:48:01:F1:E7']]]]) [2016-06-22 09:13:50 1958] DEBUG (XendDomainInfo:2504) XendDomainInfo.constructDomain [2016-06-22 09:13:50 1958] DEBUG (balloon:187) Balloon: 7602632 KiB free; need 16384; done. [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:2566) (12, 'Cannot allocate memory') Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 2561, in _constructDomain target = self.info.target()) Error: (12, 'Cannot allocate memory') [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:490) VM start failed Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 475, in start XendTask.log_progress(0, 30, self._constructDomain) File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", line 209, in log_progress retval = func(*args, **kwds) File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 2572, in _constructDomain raise VmError(failmsg) VmError: Creating domain failed: name=xxx [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:110) Domain construction failed Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 108, in create vm.start() File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 475, in start XendTask.log_progress(0, 30, self._constructDomain) File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", line 209, in log_progress retval = func(*args, **kwds) File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 2572, in _constructDomain raise VmError(failmsg) VmError: Creating domain failed: name=xxx -- Shaun

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