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Report on Xen-4.6rc2 from virt7-xen-46-candidate
by T.Weyergraf 10 Sep '15

10 Sep '15

Hi I gave the new Xen-4.6rc2 a spin on a CentOS 7 virtualisation guest (nested-xen). I haven't yet started testing guests, but rather looked at the install itself. One issue, I found, was with xenstored.service and the corresponding unit-file: [root@xencen7ws ~]# systemctl status xenstored xenstored.service - The Xen xenstore Loaded: loaded (/usr/lib/systemd/system/xenstored.service; disabled) Active: active (running) since Tue 2015-09-08 23:13:43 CEST; 13min ago Process: 757 ExecStartPre=/bin/mkdir -p /var/run/xen (code=exited, status=0/SUCCESS) Process: 753 ExecStartPre=/bin/rm -f /var/lib/xenstored/tdb* (code=exited, status=0/SUCCESS) Process: 740 ExecStartPre=/bin/grep -q control_d /proc/xen/capabilities (code=exited, status=0/SUCCESS) Main PID: 760 (xenstored) CGroup: /system.slice/xenstored.service └─760 /usr/sbin/xenstored Sep 08 23:13:43 xencen7ws.virtfinity.local xenstored[760]: TDB: tdb_open_ex: could not open file /var/lib/xenstored/tdb: No such file or directory Sep 08 23:13:43 xencen7ws.virtfinity.local xenstored[760]: Checking store ... Sep 08 23:13:43 xencen7ws.virtfinity.local xenstored[760]: Checking store complete. Sep 08 23:13:43 xencen7ws.virtfinity.local xenstored[760]: xenstored is ready Sep 08 23:13:43 xencen7ws.virtfinity.local systemd[1]: Started The Xen xenstore. As you can see, xenstored.service is running, but disabled by the package installation. This is, because xenstored.service apparently got overseen in the source-rpm's spec-file's post runtime/preun runtime. See diff [1] for details. Also, I think xenstored should write a pidfile. You might consider adding to /usr/lib/systemd/system/xenstored.service: PIDFile=/var/run/xenstored.pid and change ExecStart=/usr/sbin/xenstored to ExecStart=/usr/sbin/xenstored --pid-file /var/run/xenstored.pid $XENSTORED_ARGS Hope this helps, this is just a quick start. I'll continue checking and reporting during the next days. Regards, Thomas [1] diff -u rpmbuild-xen-4.6rc2x-3.el7-org/SPECS/xen.spec rpmbuild-xen-4.6rc2x-3.el7/SPECS/xen.spec --- rpmbuild-xen-4.6rc2x-3.el7-org/SPECS/xen.spec 2015-09-08 18:47:00.000000000 +0200 +++ rpmbuild-xen-4.6rc2x-3.el7/SPECS/xen.spec 2015-09-09 00:06:27.558344410 +0200 @@ -403,6 +403,7 @@ /bin/systemctl enable xen-qemu-dom0-disk-backend.service /bin/systemctl enable xen-init-dom0.service /bin/systemctl enable xenconsoled.service + /bin/systemctl enable xenstored.service # /bin/systemctl enable xendomains.service %endif @@ -422,6 +423,7 @@ /bin/systemctl disable xen-init-dom0.service /bin/systemctl disable xen-qemu-dom0-disk-backend.service /bin/systemctl disable xenconsoled.service + /bin/systemctl disable xenstored.service # /bin/systemctl disable xendomains.service %endif fi

3 5

Xen specfile git repos
by George Dunlap 10 Sep '15

10 Sep '15

There was some discussion about the lack of visibility of the Xen4CentOS development process. The Xen spec files and supporting patches are kept in a git tree. I've pushed copies of these trees here: https://github.com/gwd/sig-virt-xen xen-44 is the branch for Xen 4.4 development, and xen-46 is the branch for Xen 4.6 development. As is normal, these repos do not contain many of the binary tarballs required to build. The best way to get these is to download a recent srpm (from http://cbs.centos.org/repos/virt7-xen-46-testing/source/SRPMS/ -- replacing virt6 with virt7 or 44 with 46 as appropriate). The patches to the xen hypervisor are in a rather unusual format: a git "am". This makes it *much* easier to rebase and manipulate the queue if you're familiar with git; but it does add a bit to get familiar with. To manipulate the am patchqueue (using 4.4.3 as an example): 1. Check out a git repo and make a branch based on the baseline version $ git checkout -b centos/pq/4.4.3 RELEASE-4.4.3 2. Import SOURCES/xen-queue.am $ git am ${path-to-package-repo}/SOURCES/xen-queue.am OR using stackgit: $ stg init $ stg import -M ${path-to-package-repo}/SOURCES/xen-queue.am 3. Manipulate the patchqueue using normal git (or stackgit) commands 4. Export the queue again: git format-patch --stdout -N RELEASE-4.4.3 > ${path-to-package-repo}/SOURCES/xen-queue.am -George

1 1

CentOS 7 Xen 4.6-rc2+ packages available for in virt7-xen-46-testing
by George Dunlap 09 Sep '15

09 Sep '15

OK, last but not least -- Xen 4.6-rc2 packages available for CentOS 7! The Xen continuous testing infrastructure has improved dramatically over the last few years, so rc2 should already be quite stable. Please test. In particular the most recent build moves packages over from using the chkconfig compat layer to using the properly integrated systemd scripts. As usual: rpm -ivh http://cbs.centos.org/repos/virt7-xen-46-testing/x86_64/os/Packages/centos-… This will set up yum repositories for both the eventual release repositories (enabled by default), and the community build system repositories (disabled by default). At the moment, all packages will be stored in the virt-xen-44-testing repository. You can either enable this by default by editing /etc/yum.repos.d/VirtSIG-Xen.repo, or by adding "--enablerepo=virt-xen-44-testing". If you want, you can edit defaults /etc/sysconfig/xen-kernel Next, run 'yum update' to get the new kernel: yum --enablerepo=virt-xen-44-testing update kernel Now install xen: yum --enablerepo=virt-xen-44-testing install xen This should grab both xen and the updated kernel package. It should also automatically: * Add default commandline parameters for Xen and Linux when booting under Xen * Arrange for xen to come up first in the grub * Set the default boot entry to Xen. That's it! Reboot and you should be good to go. libvirt packages have not been built yet. Please report any problems or feedback to this list. -George

1 0

Xen 4.4.3 packages available in virt6-xen-44-testing
by George Dunlap 09 Sep '15

09 Sep '15

So first of all, if you've used the CBS before, please note the name change -- it's no longer virt6-testing, but virt6-xen-44-testing. Easiest way to install: rpm -ivh http://cbs.centos.org/repos/virt6-xen-44-testing/x86_64/os/Packages/centos-… This will set up yum repositories for both the eventual release repositories (enabled by default), and the community build system repositories (disabled by default). At the moment, all packages will be stored in the virt-xen-44-testing repository. You can either enable this by default by editing /etc/yum.repos.d/VirtSIG-Xen.repo, or by adding "--enablerepo=virt-xen-44-testing". If you want, you can edit defaults /etc/sysconfig/xen-kernel Next, run 'yum update' to get the new kernel: yum --enablerepo=virt-xen-44-testing update kernel Now install xen: yum --enablerepo=virt-xen-44-testing install xen This should grab both xen and the updated kernel package. It should also automatically: * Add default commandline parameters for Xen and Linux when booting under Xen * Arrange for xen to come up first in the grub * Set the default boot entry to Xen. That's it! Reboot and you should be good to go. Libvirt packages haven't been rebuilt -- not sure if they work or not. If they don't, let me know and I'll re-submit them.. Please report any problems or feedback to this list. -George

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Beta CentOS 7 Xen packages available
by George Dunlap 08 Sep '15

08 Sep '15

At long last, I'd like to announce beta packages for CentOS 7, available from the community build system. Start by installing the centos-release-xen: rpm -ivh http://cbs.centos.org/repos/virt7-xen-44-testing/x86_64/os/Packages/centos-… This will set up yum repositories for both the eventual release repositories (enabled by default), and the community build system repositories (disabled by default). At the moment, all packages will be stored in the virt-xen-44-testing repository. You can either enable this by default by editing /etc/yum.repos.d/VirtSIG-Xen.repo, or by adding "--enablerepo=virt-xen-44-testing". If you want, you can edit defaults /etc/sysconfig/xen-kernel Next, run 'yum update' to get the new kernel: yum --enablerepo=virt-xen-44-testing update kernel Now install xen: yum --enablerepo=virt-xen-44-testing install xen This should grab both xen and the updated kernel package. It should also automatically: * Add default commandline parameters for Xen and Linux when booting under Xen * Arrange for xen to come up first in the grub * Set the default boot entry to Xen. That's it! Reboot and you should be good to go. Libvirt packages aren't available yet but should be on the way soon (I'll announce them here.) Please report any problems or feedback to this list. -George

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Virt SIG today
by Lars Kurth 08 Sep '15

08 Sep '15

Folks, I had some problems with my calendar entry. Today's VIRT SIG meeting is on. All I have done is delete the 4-weekly invite for a conf call, and made the meeting invite for the IRC meeting bi-weekly. Sorry for any confusion caused Regards Lars

1 0

Enabling enhanced neetworking for CentOS 6 bqse images in AWS
by Nico Kadel-Garcia 06 Sep '15

06 Sep '15

I've made a few OS's from the the CentOS 6 base images in AWS, and they're working quite wwell. But I'm reaalizing that they do not have the enhanced networking enabled by default. And I'm also realizing that I have to *stop* the OS in AWS terms, enable network enhanced networking manually, and lose all the contengs of my ephemereal storage when I do this. Is there any reason not to enable enhanced networking by default, in the base CentOS 6 image and same a painful and painful step for AWS users?

1 0

Centos Xen libvirt question
by Chuck Meade 04 Sep '15

04 Sep '15

Hello, Looking for libvirt-daemon-xen for Centos 7. Does anyone have the location of this package? Thanks, Chuck

2 2

Assigning a PCI sound device to a VM
by Robert Nichols 03 Sep '15

03 Sep '15

I have a PCI sound card that I would like to assign to a VM, but when I try to do so the VM fails to start and displays this message: Error starting domain: Unable to read from monitor: Connection reset by peer Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 44, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in tmpcb callback(*args, **kwargs) File "/usr/share/virt-manager/virtManager/domain.py", line 1125, in startup self._backend.create() File "/usr/lib64/python2.6/site-packages/libvirt.py", line 686, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: Unable to read from monitor: Connection reset by peer The XML generated by virt-manager for the device is <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x07' slot='0x04' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </hostdev> The sound card is an Asus Xonar DGX PCIe 5.1, and identifies itself as "07:04.0 Multimedia audio controller: C-Media Electronics Inc CMI8788 [Oxygen HD Audio]". I see the same problem if I try to assign the motherboard's Intel Xeon E3-1200 HD Audio Controller to the VM. Both of these devices are supported by the host kernel (3.18.17-13.el6.x86_64). I have no problem assigning a USB sound device, but those have very limited capability. -- Bob Nichols "NOSPAM" is really part of my email address. Do NOT delete it.

2 3

qemu-kvm-ev with CentOS 7.1
by Gena Makhomed 18 Aug '15

18 Aug '15

Hello, All! Is it possible to use binary packages build from http://resources.ovirt.org/pub/ovirt-3.5/rpm/el7/SRPMS/qemu-kvm-ev-2.1.2-23… with plain CentOS 7.1 and use all other packages from CentOS (libvirt, virt-manager, etc) Is it have reasons, if I not use live migrations and qcow2 snapshots? (instead use zfs, zvols and zfs snapshots for VM disks online backups) Is using qemu-kvm-ev with CentOS 7.1 have any disadvantages? -- Best regards, Gena

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