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1608 discussions

XEN multiple bridge problem - VM won' start!
by Matija Draganović 18 Nov '11

18 Nov '11

Dear Peter, Thanks for your reply. I was so occupied with troubleshooting that I forgot to mention the OS & Xen version :) My CentOS version is CentOS release 5.7 (Final) Linux 2.6.18-274.7.1.el5xen #1 SMP Thu Oct 20 17:06:34 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux and Xen v3.0. I tried creating bridges the same way you did and succedded. I also tried doing the same via ifcfg scripts, and it also worked. I have no problem with creating bridges and connecting them with physical ifaces, but I can't start my VM's (most of the time one VM start but the other one hangs while trying to initalize eth2 that is connected to my second (non default - xenbr1) bridge)). The only diference between your config and mine is that I have vifname-s listed (example below): vif = [ "mac=00:16:36:72:35:e5,bridge=xenbr0,script=vif-bridge,vifname=vif4.0", "mac=00:16:3e:57:de:0d,bridge=xenbr1,script=vif-bridge, vifname=vif4.1" ] I'm not saying that this could be the problem, but since I'm slowly running out of ideas - it's a longshot :) So, to sum it all up - I can create bridges properly, but my VM's hang when they try to bring up vifaces connected to the xenbr1. Also, I have no problem with having only one bridge active - problem appears when I have multiple bridges. Br, Matija

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XEN multiple bridge problem - VM won' start!
by Matija Draganović 18 Nov '11

18 Nov '11

Hi, I've been using CentOS & Xen on a server that has 2 VM's configured. The default configuration includes one physical iface that is propagated (by a default bridge) to the VM's. Since I wanted to configure additional physical iface, define a new bridge and propagate it to the viface-s of the VM's, i configured the bridge/phys. iface and brought it up (here are configurations that I set up): -> eth3 DEVICE=eth3 BOOTPROTO=static HWADDR=D4:85:64:4B:76:AB ONBOOT=yes #HOTPLUG=no #DHCP_HOSTNAME=kdr-3k-4r-3o-07 BRIDGE=br0 TYPE=Ethernet -> br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=none ONBOOT=yes Then I configured new virt. ifaces on VM's (using virsh edit, config is listed below): <interface type='bridge'> <mac address='00:16:36:17:62:5d'/> <source bridge='xenbr0'/> <script path='vif-bridge'/> <target dev='vif5.0'/> </interface> <interface type='bridge'> <mac address='00:16:3e:ca:63:39'/> <source bridge='br0'/> <script path='vif-bridge'/> <target dev='vif5.1'/> </interface> You can see the default bridge (xenbr0 -> vif5.0) and my new bridge br0 connected to vif5.1. So, here I got stuck up - when I try tu start a VM (xm create VIRT_SRV), the VM starts booting but hangs up (I can ping it form another srv., but when I try SSH it says "connection refused"). When I remove configuration for vif5.1 the VM starts up normally. I actually managed to start VM with vif5.1 up once, but next time I restarted it, the problem was there :/ Furthermore, I noticed this in the Xen log: [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices vif. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:166) Waiting for 0. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:544) hotplugStatusCallback /local/domain/0/backend/vif/1/0/hotplug-status. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:544) hotplugStatusCallback /local/domain/0/backend/vif/1/0/hotplug-status. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:558) hotplugStatusCallback 1. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:166) Waiting for 1. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:544) hotplugStatusCallback /local/domain/0/backend/vif/1/1/hotplug-status. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:558) hotplugStatusCallback 1. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices usb. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices vbd. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:166) Waiting for 768. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:544) hotplugStatusCallback /local/domain/0/backend/vbd/1/768/hotplug-status. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:558) hotplugStatusCallback 1. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:166) Waiting for 5632. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:544) hotplugStatusCallback /local/domain/0/backend/vbd/1/5632/hotplug-status. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:558) hotplugStatusCallback 1. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices irq. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices vkbd. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices vfb. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices pci. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices ioports. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices tap. [2011-11-18 09:27:16 xend 8213] DEBUG (DevController:160) Waiting for devices vtpm. So the boot process goes on regulary until the last line ("Waiting for devices vtpm"). It seems like TPM makes it impossible for VM's to start regulary. When I open the VM's console (with virt-manager) I see the whole boot process but it hangs when it tries to start iface eth2 (attached to the second bridge) ... Does anybody have a clue why is this happening? Thanks in advance ..

2 1

P2V utility
by Rajagopal Swaminathan 08 Nov '11

08 Nov '11

Greetings, An somebody pint to me to P2V Utility for the m$ world? Like in VMware? -- Regards, Rajagopal

2 1

how to add file-based disk space to a guest
by thomas veymont 31 Oct '11

31 Oct '11

hi there, I'm following these documentations to add a file-based disk volume to a KVM guest under Centos 6.0 : http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualiz… as instructed, I created a "pool" then a "volume", file-based, e.g : mkdir /mnt/raid/kvm_pool1 virsh # pool-define-as pool1 dir - - - - "/mnt/raid/kvm_pool1" virsh # pool-autostart pool1 virsh # vol-create-as pool1 volume1 20G --allocation 15G --format qcow2 now I want to associate "volume1" to my guest OS. Following this doc: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualiz… - why does this ask me to create a file with "dd" ? it's already been created before with the virsh pool commands, isn't it? Seems to me I'm bypassing the libvirt/virsh layer if I do that. - after that, the doc tells me to do some stuff with guest XML files. Is'nt there some specific commands provided by virsh to associate a managed Pool to a managed Guest ? - in this case, should I use the virsh "attach-disk" command ? thanks. -- Tom

2 4

using local media file to install guest
by Bob Hoffman 31 Oct '11

31 Oct '11

Hi, Been fighting with this for a long time and have narrowed my issues down to one item... How to use a iso image file to install a guest os with centos6? I installed centos6 with the virt host package. According to few obscure sites virt-install cannot use local media iso to install guests. With virt-manager I was able to use the same iso to make a guest, but I do not want the gui on the server. I tried mounting, umounting it..I tried using dd to bring the bootable iso from the cdrom. the issue I think, but not sure, is the use of the console directive with virt-install. It appears --extra-args="console=tty0 console=ttyS0,115200" works fine when using --location, but not --cdrom Unfortunately '--location" will ignore the path provided for the local iso and want to go to a url, an nfs, a virtual hard drive or cdrom....thus not able to install from local media. However, the text installer does come up. when using "--cdrom" and use location to the different ISO's I added the console will not come up as the --extra-args="console=tty0 console=ttyS0,115200" is ignored I assume. I cannot believe that the only way to install a guest on my machine is to use the desktop gui or a remote iso only. There has to be a way to install via the local iso... I have tried about 40 times with different ideas, even playing with the files on the mounted bootable iso. However, the console only works with --location thus unusable.....sigh. any help appreciated. here is just a basic example of my attempts virt-install --name test --ram=1024 --vcpus=1 --prompt --nographics --location=/backups/backup1/centos6.iso --extra-args="console=tty0 console=ttyS0,115200" I do not want VNC since again, that is not part of the normal install and is again asking me to use a remote computer to install on my local one, which is just not right. There must be a way to install on my local computer, from my local computer, from local file, a local guest.... isn't there?

6 17

onboot=yes not working for eth0.x:y interfaces?
by Dennis Jacobfeuerborn 25 Oct '11

25 Oct '11

Hi, I ran into a Problem when using alias interfaces with vlans on a centos 5 box. When I define such an interface and do a "service network restart" the alias interface doesn't get started. Starting it manually works fine. Also after changing DEVICE=eth0.10:0 to DEVICE=eth0:0 in the config file the interface is started after a network restart. Does anyone have an idea what the problem might be or a suitable workaround? Regards, Dennis

2 1

bridging bonded NICs, centos6
by Bob Hoffman 25 Oct '11

25 Oct '11

Trying to think this through, hope someone can lend a hand. I have 3 eths I want to bond together and that seems simple enough. eth0,1,2 <-> bond0 , though not sure how this would be for multiple ip addresses needed for the virtual machines... perhaps eth:0, eth:1 etc....to bond0:1, bond0:2 ? then I want to bridge to my virtual machines.... I am going to be using virtual machines, each with one ip address (websites) some with possibly more than one ip... so... for each ip do I need to bond all three nics, go to a new bonding file, then to the bridge file for that virtual machine? what happens when I use two IP addresses for the same virtual machine? Each machine wants to use just one bridge, but will it use more than one? I am pretty sure each bonding file must have an ipaddress on it...so perhaps it will be multiple eth files pointing to multiple bonding files pointing to single bridge files for each machine? somewhat confused. any help appreciated. am I even close?

2 1

disk i/o benchmarking inside vm
by Dennis Jacobfeuerborn 23 Oct '11

23 Oct '11

Hi, I'm having trouble benchmarking disk i/o in my vm's. The data I get seems bogus. I have two centos 6 guests which use a raw image as volume. Each volume is stored on its own physical disk and both disks are the same model. The host system is fedora 15 with the virt-preview repo enabled. The disks for the guests use virtio and caching is set to none. My problem is that I get very different results when I benchmark I/O in these guests even though I shouldn't. Doing a seekmark I get: guest 1: 120 seeks/s guest 2: 220 seeks/s "hdparm -t" shows: guest 1: 100 MB/s guest 1: 160 MB/s What's worse is that when I restart the guests the results change and suddenly guest 1 is a lot faster and guest 2 is a lot slower however as long as the guests are running repeating the benchmarks give consistent results. When I test the disks on the host directly I get: seekmark: /dev/sdb: 75 seeks/s /dev/sdc: 75 seeks/s hdparm -t: /dev/sdb: 140 MB/s /dev/sdc: 140 MB/s What bugs me is not so much the absolute numbers (for now) but the fact that these guests give so wildly inconsistent results. Even if the jump from 75 seeks/s to 120 seeks/s from host to guest is explainable by the way block i/o is handled in the virtualization layer I would still expect both guests to return similar results and I would also expect to see similar results across restarts of a single guest. I've attached the definition for both guests even though they are virtually identical. Does anyone have an idea what's happening here? Regards, Dennis

5 10

Emergency help needed on host network randomly stop working.
by Magicloud Magiclouds 13 Oct '11

13 Oct '11

Hi, This is a Centos 5.5 host with one xen guest. About 2 weeks ago, the host randomly lost network connection. By this I mean I could not connect to the services on it, or ping it. Also was the status of the guest. From serial console, I connected to the host, trying to see what happened. No clue (any error messages) in messages or dmesg. ifdown/ifup the interface did not help, either. Only rebooting was my only choice. Searching through Google, I got the information that some other guys met similar problem, and resolved by setting stp on with the bridge interface. I set it, too. And the problem still occurs. Any idea what I should check now? Thanks. -- 竹密岂妨流水过山高哪阻野云飞

3 3

KVM and shared disc...
by Gilberto Nunes 09 Oct '11

09 Oct '11

Hi all I have deploy some VM's with MS Windows 2008 R2. I deploy it using virt-manager, on CentOS 6. On the same host where I installed CentOS I have installed LIO-Target to, in order to providing iSCSI storage to VM's, 'cause I need install Windows Cluster failover here. I was work with iSCSI initiator from inside each VM's but this pratice show me very instable situations. Now, I use iscsi-initiator direct from host, on physical linux server and I try to seek the iSCSI storage from that host... I was capable to found the device and attached into VM settings, via virt-manager. But, when I try to start the VM, I get this message: libvirtError: internal error Process exited while reading console log output char device redirected to /dev/pts/2 qemu-kvm+ -device lsi,id=scsi0,bus=pci.0,addr=0x7: Parameter 'driver' expects a driver name Try with argument '?' for a list Someone has take this error someday??? Thanks -- Gilberto Nunes (47) 8861-6672 (47) 9676-7530 msn: gilbertonunesferreira(a)hotmail.com Skype: gilberto.nunes36 --

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