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1608 discussions

Are xen and centos incompatible?
by lee 17 Jun '14

17 Jun '14

Hi, I'm trying to pass a physical network interface through to a domU. This seems to be impossible because the way xen wants to do it is incompatible with the way centos wants to do it. I followed documentation on http://www.xen-support.com/?p=151 and tried booting with 'pciback.permissive pciback.hide=(06:00.0)'. This gives a hint in dmesg "kernel: xen-pciback: backend is vpci", and the device is still visible in dom0. So this obviously doesn't work. Following http://wiki.xen.org/wiki/Xen_PCI_Passthrough: [root@heimdall ~]# xl pci-assignable-add 06:00.0 xend is running, which may cause unpredictable results when using this xl command. Please shut down xend before continuing. (This check can be overridden with the -f option.) [root@heimdall ~]# There doesn't seem to be any documentation about what xend does or is for and how to pass a physical network interface through with it. I'm starting to think that using centos for a server os is an extremely bad choice because nothing works. It's not like a Linux distribution but like a mess of pieces from several unrelated puzzles thrown together randomly. -- Knowledge is volatile and fluid. Software is power.

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Centos 6.5 Xen Stock cannot run dom-u PCI: Fatal: - ipmi_si
by Periko Support 17 Jun '14

17 Jun '14

I had a supermicro server SuperServer 1027R-WRF4+ and a old Dell PowerEdge 2950. In both machines I setup centos 6.5, which is running 3.10.34-11.el6.centos.alt.x86_64. I follow Xen4Cen wiki to setup Xen, I had other servers running Centos 5.x without issues. Now, once I build my vm's dom-u centos 6.5/centos 5.9 both x64, I receive different erros, let me show u the message I receive in my console for centos 6.5 dum-u. xl console oerp-server PCI: Fatal: No config space access function found ipmi_si: Could not set up I/O space ipmi_si: Could not set up I/O space ipmi_si: Could not set up I/O space Something related to ipmi in my server which is enable by default? can be, now what happen is I try to boot xentos 5.9 x64 dom-u: Brought up 1 CPUs checking if image is initramfs... it is Grant table initialized NET: Registered protocol family 16 Brought up 1 CPUs PCI: setting up Xen PCI frontend stub ACPI: Interpreter disabled. Linux Plug and Play Support v0.97 (c) Adam Belay pnp: PnP ACPI: disabled xen_mem: Initialising balloon driver. usbcore: registered new driver usbfs usbcore: registered new driver hub PCI: System does not support PCI PCI: System does not support PCI NetLabel: Initializing NetLabel: domain hash size = 128 NetLabel: protocols = UNLABELED CIPSOv4 NetLabel: unlabeled traffic allowed by default NET: Registered protocol family 2 IP route cache hash table entries: 65536 (order: 7, 524288 bytes) TCP established hash table entries: 262144 (order: 10, 4194304 bytes) TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) TCP: Hash tables configured (established 262144 bind 65536) TCP reno registered audit: initializing netlink socket (disabled) type=2000 audit(1402907331.494:1): initialized VFS: Disk quotas dquot_6.5.1 Dquot-cache hash table entries: 512 (order 0, 4096 bytes) Initializing Cryptographic API alg: No test for crc32c (crc32c-generic) ksign: Installing public key data Loading keyring - Added public key 691B840A64868995 - User ID: CentOS (Kernel Module GPG key) io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered (default) pci_hotplug: PCI Hot Plug PCI Core version: 0.5 rtc: IRQ 8 is not free. Non-volatile memory driver v1.2 Linux agpgart interface v0.101 (c) Dave Jones brd: module loaded Xen virtual console successfully installed as xvc0 Event-channel device installed. Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx ide-floppy driver 0.99.newide usbcore: registered new driver hiddev usbcore: registered new driver usbhid drivers/usb/input/hid-core.c: v2.6:USB HID core driver PNP: No PS/2 controller found. Probing ports directly. i8042.c: No controller found. mice: PS/2 mouse device common for all mice md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27 md: bitmap version 4.39 TCP bic registered Initializing IPsec netlink socket NET: Registered protocol family 1 NET: Registered protocol family 17 XENBUS: Device with no driver: device/vbd/51712 XENBUS: Device with no driver: device/vif/0 XENBUS: Device with no driver: device/console/0 Initalizing network drop monitor service Write protecting the kernel read-only data: 506k Red Hat nash version 5.1.19.6 starting Mounting proc filesystem Mounting sysfs filesystem Creating /dev Creating initial device nodes Setting up hotplug. Creating block device nodes. Loading ehci-hcd.ko module Loading ohci-hcd.ko module Loading uhci-hcd.ko module USB Universal Host Controller Interface driver v3.0 Loading jbd.ko module Loading ext3.ko module Loading xenblk.ko module XENBUS: Waiting for devices to initialise: 295s...290s...285s...280s...275s...270s...265s...260s...255s...250s...245s...240s...235s...230s...225s...220s...215s...210s...205s...200s...195s...190s...185s...180s...175s...170s...165s...160s...155s...150s...145s...140s...135s...130s...125s...120s...115s...110s...105s...100s...95s...90s...85s...80s...75s...70s...65s...60s...55s...50s...45s...40s...35s...30s...25s...20s...15s...10s...5s...0s... XENBUS: Timeout connecting to device: device/vbd/51712 (local state 3, remote state 1) Loading dm-mod.ko module device-mapper: uevent: version 1.0.3 device-mapper: ioctl: 4.11.6-ioctl (2011-02-18) initialised: dm-devel(a)redhat.com Loading dm-log.ko module Loading dm-mirror.ko module Loading dm-zero.ko module Loading dm-snapshot.ko module Loading dm-mem-cache.ko module Loading dm-region_hash.ko module Loading dm-message.ko module Loading dm-raid45.ko module device-mapper: dm-raid45: initialized v0.2594l Scanning and configuring dmraid supported devices Scanning logical volumes Reading all physical volumes. This may take a while... No volume groups found Activating logical volumes Volume group "VolGroup00" not found Creating root device. Mounting root filesystem. mount: could not find filesystem '/dev/root' Setting up other filesystems. Setting up new root fs setuproot: moving /dev failed: No such file or directory no fstab.sys, mounting internal defaults setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory Switching to new root and running init. unmounting old /dev unmounting old /proc unmounting old /sys switchroot: mount failed: No such file or directory Kernel panic - not syncing: Attempted to kill init! Looks is not finding the dom-u disk. In both cases I'm using almost the same settings: name = "centos5" uuid = "5020979f-8dae-105d-df56-9fb28d377aa2" bootloader = "/usr/bin/pygrub" memory = 2048 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" disk = [ "tap:aio:/ext4/centos5/disk.img,xvda,w" ] vif = [ "mac=X:X:X:X:X:X,bridge=xenbr0,script=vif-bridge" ] The main line of centos stock without Xen continue using kernel 2.6.x, but Xen is using the new line 3.x. Anyone else with this issue? Thanks for your time.

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Re: [CentOS-virt] [Xen-users] Can't get vnc connections to bind to 0.0.0.0
by Periko Support 17 Jun '14

17 Jun '14

On Tue, Jun 17, 2014 at 7:47 AM, Ian Campbell <Ian.Campbell(a)citrix.com> wrote: > On Tue, 2014-06-17 at 10:41 -0400, Phillip Susi wrote: >> On 6/17/2014 10:10 AM, Ian Campbell wrote: >> > Which toolstack. >> >> xl >> >> > This is a PVFB, not sure if they work for HVM or not. >> >> Seems to work just fine other than refusing to bind to 0.0.0.0 so I >> can access it from another machine on the network without setting up >> an ssh tunnel. >> >> > You probably want a toplevel vnclisten="0.0.0.0:0" to cause the >> > VNC associated with the emulated VGA to be bound to the address >> > which you want. >> >> "toplevel"? > > I mean literally write: > vnclisten="0.0.0.0:0" > in your configuration file, not wrapped in a vfg = []. > > Ian > > > _______________________________________________ > Xen-users mailing list > Xen-users(a)lists.xen.org > http://lists.xen.org/xen-users This is my settings: vfb = [ "type=vnc,vnclisten=192.168.2.27,vncpasswd=XXXXXX,vncdisplay=1,keymap=en-us" ] Hope this helps.

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Xen PV domU reported as Xen-HVM
by Karl Johnson 17 Jun '14

17 Jun '14

Hello, I am running two dom0s, one on CentOS 5 with Xen 4.1.2 (from Gitco) and the other one on CentOS 6 with Xen 4.2.4 (from Xen4CentOS). I host one LVM based domU on both from the same template (CentOS 6 PV) with the same Xen config (see below). However, the domU on Xen 4.1 reports itself as Xen PV while the domU on Xen4CentOS reports itself as Xen HVM. == First domU == virt-what and cPanel scripts report domU as: xenpv dom0: 2.6.18-371.6.1.el5xen Xen 4.1.2 domU Config: bootloader = '/usr/bin/pygrub' extra = '' memory = 6144 hostname = 'web2.x.ca' cpu_weight = 256 name = 'vm115' vif = ['ip=205.X.X.X, vifname=vifvm115.0, mac=00:16:3e:7a:X:X'] vnc = 0 vcpus = 6 vncviewer = 0 serial = 'pty' disk = ['phy:/dev/xen/vm115_img,xvda1,w', 'phy:/dev/xen/vm115_swap,xvda2,w'] domU kernel: 2.6.32-431.5.1.el6.x86_64 root@web2 [~]# virt-what xen root@web2 [~]# == Second domU == virt-what and cPanel scripts report domU as: xenhvm dom0: 3.10.32-11.el6.centos.alt.x86_64 Xen 4.2.4-29.el6 domU Config: bootloader = '/usr/bin/pygrub' extra = '' memory = 6144 hostname = 'web3.x.ca' cpu_weight = 256 name = 'vm116' vif = ['ip=205.X.X.X, vifname=vifvm116.0, mac=00:16:3e:cf:X:X'] vnc = 0 vcpus = 6 vncviewer = 0 serial = 'pty' disk = ['phy:/dev/xen/vm116_img,xvda1,w', 'phy:/dev/xen/vm116_swap,xvda2,w'] domU kernel: 2.6.32-431.5.1.el6.x86_64 root@web3 [~]# virt-what xen xen-hvm root@web3 [~]# Any idea why? Kinds regards, Karl

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Finally switching from Xen to KVM - question about networking
by Steve Campbell 11 Jun '14

11 Jun '14

I had so much trouble putting Centos 6 guest VMs on a Centos 5 host that I finally switched to a Centos 6 host. I've not needed more that test VMs, so I've used Virtual Machine Manager on the old system, which worked pretty well, so I decided to create my first KVM guest machine. I noticed when I created it, I only had the options of NAT for my network interface, so I used that (obvious). Well, after starting the VM, I find I don't have connectivity with that interface. Reading, I find examples where I need to create bridges perhaps. Xen did most of this for me, so it's a little new to me. Can anyone throw me a clue, please? steve campbell

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Re: [CentOS-virt] qemu-kvm rebuild in Centos for oVirt in SIG Virt
by George Dunlap 10 Jun '14

10 Jun '14

On Tue, Jun 10, 2014 at 5:18 PM, Karanbir Singh <kbsingh(a)centos.org> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 06/10/2014 05:16 PM, George Dunlap wrote: >> >> They seem keen to get this in sooner rather than later. Is there >> yet a way for me to create a new package for the Virt SIG that you >> could brief me on? Alternately, could one of the core CentOS team >> take a bit of time sometime in the next few weeks to build such a >> package? >> >> I tried to build the qemu-kvm package on git.centos.org, hoping to >> be able to just give you guys a functional repo you could use, but >> the c6 branch of the repo on git.centos.org seems to be empty. > > we are hoping to boot the community buildsystem up in the coming days, > that would be the best place to handle this. Excellent -- looking forward to it. > also, the virt-sig repo setup at this point is the xen4centos repo - > is that the best place to land this ? Well I guess we have two options: 1. Rename xen4centos to sigvirt-hv (or something like that -- Virt SIG, hypervisor level) 2. Create a new repo for qemu changes (kvm4centos? sigvirt-kvm?) On a practical level, this only affects the (I'm guessing) fairly small number of people who install two different hypervisors. For those people, #1 means opting into all the Virt SIG hypervisors when opting into one, and having to do something special to get the upstream version of one and the Virt SIG version of another; while #2 means opting into each Virt SIG hypervisor separately. I suppose #1 would mean automatically getting for updated ancillary packages from xen4centos (ocaml?) when you just wanted to install qemu-kvm. Choosing #2 may mean a proliferation of repos; but since there will almost certainly never be more than 4 different hypervisors supported, that's probably not too big of an issue. I'm not sure what else it might mean from a technical perspective. Anything I missed? I don't really have strong opinions here. My personal inclination would be to just have one repo; but I could see how it might be weird to accidentally get updated packages related to Xen when you just wanted snapshotting for KVM. -George

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Re: [CentOS-virt] qemu-kvm rebuild in Centos for oVirt in SIG Virt
by Douglas Schilling Landgraf 10 Jun '14

10 Jun '14

On 06/05/2014 07:22 AM, George Dunlap wrote: > On Thu, Jun 5, 2014 at 11:25 AM, Lars Kurth <lars.kurth(a)xen.org> wrote: >> On 04/06/2014 20:17, Douglas Schilling Landgraf wrote: >>> Hello, >>> >>> I would like to continue this process in the SIG Virt. Any advice/steps >>> which I should follow? >>> >>> Thanks! >>> >> Douglas, >> we are not ignoring you. As it turns out there are quite a few unknown >> pieces related to the libvirt version for this SIG and there was also a >> discussion with Dan Kenigsberg at last week's Hackathon. I don't have >> the technical depth to go through your proposal. Added George. > > So the problem at the moment is that the CentOS project is still in > transition to being community-developed. Lars and I are officially > running the SIG, but we don't yet have a way to create new packages > for our SIG; and the core CentOS team is rather overwhelmed with > trying to develop and set up this new system, manage all the SIGs, and > prepare for CentOS 7. > > So, rest assured that "create a qemu-kvm package with snapshot > enabled" is on our to-do "short list", and won't be forgotten; but it > may be a few months before the system is in place for non-core CentOS > people to contribute new packages. > > If you think this needs to happen sooner for some reason, we'll > probably need to ask KB or Johnny to do it. > > -George > Thanks for the feedback George and Lars. As we have several users requesting such feature and there is a new oVirt release knocking the door I would like to continue with KB or Johnny. -- Cheers Douglas

2 1

Network Bridgeing
by Ing. Ramon Resendiz 10 Jun '14

10 Jun '14

Hi, I have the following issue i recently installed a VM with qemu and libvirtd, everything is almost ok. The problem is that i have 5 usable IP address (valid ip address on internet) for eth0, and i want to use one of this IP for my VM (Windows 2008 Standard R2 by the way). I did the bridge between my eth0 and br0, the VM could browse into internet and download patches, etc. etc. I tried to use a networking alias, this is the network interface eth0 assign a IP address and for the eth0:1 assign other IP address, and this bridged to the br0 instead of eth0 to eth0:1; after restart the network service the connectivity lost, and then get in back the original configuration everything seems to work again. But my goal is not archived. Goal: eth0 must have a valid ip address to be accesed, eth0:1 (bridged to br0) must have a valid address to be assigned to the VM. Through iptables assign ACL to each IP address (valid IP address) depending of the services to host (web server and db server, rdp host) and between interfaces could be possible to communicate between them (virtual host and virtual machine). eth0: Virtual Host eth0:1: Virtual machine (bridged to br0) Thank you very much for you time. Best regards, RR

2 4

Problem with X on VM
by Steve Campbell 09 Jun '14

09 Jun '14

I've got a Centos 5 server with Xen installed. I'm trying to install a Centos 6.5 VM on it but once all is installed, the X window will not sync or display. I think I understand that it's probably due to the settings on the vnc stuff. I've got Centos 6.2 VMs that act just fine. Is there a way I can modify the VM's screen settings either during installation or after installation? Hope that makes sense. Thanks steve campbell

4 7

Re: [CentOS-virt] Windows 7 on a centos kvm host pauses after the installation reboot.
by James B. Byrne 09 Jun '14

09 Jun '14

On Sun, June 8, 2014 19:21, Eliezer Croitoru wrote: > I am using Centos 6.5 as a kvm hypervisor with local ssd disks in raid > and with glusterfs based storage for couple disk images. > I have tried to install Windows 7 from ISO and it seems to pass the > first stage of the installation which installs the basic files and also > the first reboot. > After that the installation is almost finished and the desktop should be > up and running after a reboot but instead the Windows 7 machine gets > paused before windows shows the windows 7 logo at the boot sequence. > > I have tried to find for a record of the issue in the past but found > only tiny records which I did not understood from, if it was solved or not. > The kvm host has 16GB of ram and 100GB of disk space. > For this specific host I have used a disk image ontop of glusterfs but > the same happens ontop of glusterfs and ontop of local disks. > > I have an ubuntu kvm host with less RAM and I can install windows server > 2012 (which I was unable to install on the Centos 6.5 kvm host both 2012 > + windows 8 + windows 7). > > Two things: > If anyone had or has the same issue please notify me. > If anyone has a solution please share it. > > Thanks, > Eliezer > 1. Is there a CD/DVD drive associated with the VM? 2. If so, do you have a readable optical disk in the drive when starting the Windows7 guest? If the answer to 1 is yes and to 2 is no and your guest configuration file shows this: 30 <disk type='block' device='cdrom'> 31 <driver name='qemu' type='raw'/> 32 <source dev='/dev/sr0'/> 33 <target dev='hdc' bus='ide'/> 34 <readonly/> 35 <address type='drive' controller='0' bus='1' target='0' unit='0'/> 36 </disk> then remove the line '<source dev='/dev/sr0'/>' and try again. HTH. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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