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1613 discussions

Network frozen in Centos 5 with Xen
by onlineque onlineque 17 Feb '11

17 Feb '11

Hello, I have this problem - I have installation of Xen and Centos 5 (all RPMs are from Centos repositories). I have several DomU virtual machines running on this machine. When I try to copy some bigger amount of data from another physical computer to Dom0/DomU on this machine, the network freezes. The link is still up, I can see that the connection really links on the switch, but nothing is received or sent to the network. I tried to stop all the DomUs, stop the network, unload the network drivers from memory and loading them again and starting the network, but the problem persists. Only reboot solves the problem. Sometimes the amount of data have to be around gigabytes (last time it was 10GB), sometimes 500MB is enough to stop the network... I also tried to change the NIC, but the behavior is the same. Btw. logs don't say anything :-/ Any idea ? Thank you very much ! Vladimir PS: this is the output of my lspci: 00:00.0 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge 00:00.1 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge 00:00.2 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge 00:00.3 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge 00:00.4 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge 00:00.7 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge 00:01.0 PCI bridge: VIA Technologies, Inc. VT8237 PCI bridge [K8T800/K8T890 South] 00:05.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) 00:0b.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5705 Gigabit Ethernet (rev 03) 00:0f.0 RAID bus controller: VIA Technologies, Inc. VIA VT6420 SATA RAID Controller (rev 80) 00:0f.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) 00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) 00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) 00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) 00:10.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) 00:10.4 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 86) 00:11.0 ISA bridge: VIA Technologies, Inc. VT8237 ISA bridge [KT600/K8T800/K8T890 South] 00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 60) 00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control 00:19.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 00:19.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 00:19.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 00:19.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control 01:00.0 VGA compatible controller: nVidia Corporation NV15 [GeForce2 GTS/Pro] (rev a4) output of uname -a: Linux hydra 2.6.18-194.11.4.el5xen #1 SMP Tue Sep 21 05:40:24 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

2 1

using an lvm for kvm vm
by Nataraj 14 Feb '11

14 Feb '11

Is there a simple way to directly install a vm on an lvm (or proably seperate LVM's for root and swap)? For example something like: lvcreate -L 10G -n testvm_root vg_myvg lvcreate -L 1G -n testvm_swap Then somehow setup the VM to be able to directly install and boot the vm from these LV's. How do I do this? Could you then pause the virtual machine and safely take an LVM snapshot, continue the VM and then mount the snapshot on the host and do a backup? This would be for CentOS/Redhat 6. Thanks, Nataraj

4 6

iTunes?
by MargoAndTodd 13 Feb '11

13 Feb '11

Hi All, If you would please suffer a Fedora Code 13 question on a CentOS mailing list, I have a Linux customer with Fedora Code 13 who loves it but is about to dump it because he really, really wants iTunes. (He owns an iPod and an iPhone.) None of the Linux utilities quite work right and he wants to buy music from the iTunes store as well. Plus he wants to synchronize his contacts list. So, I was thinking of installing an XP VM on his computer. Would iTunes work properly? Would you use KVM or Virtual Box? Any words of wisdom shared would be appreciated. Many thanks, -T

4 10

CentOS 4.8
by Y. K. Liu 03 Feb '11

03 Feb '11

Hi, I installed CentOS 4.8 on VMware Fusion 3.1.2. The installation was fine. During the installation, it asked me to enter my username and password. I tried to enter "root" as the username, but it was not allowed. So I had to enter other name for that. After I logged into CentOS 4.8, I could not do sudo because I was a regular user. Could somebody tell me how I can become root? Thank you. Jerry

3 6

Trouble with virtio storage
by Vladimir Vuksan 02 Feb '11

02 Feb '11

I am trying to get a custom Centos 5 image going under Openstack Nova (a cloud framework). Trouble I have is that for whatever reason virtio storage doesn't work for me. For example if the VM is started using these options <os> <type>hvm</type> <kernel>/opt/nova-state/instances/instance-00000045/kernel</kernel> <cmdline>root=/dev/vda console=ttyS0</cmdline> <initrd>/opt/nova-state/instances/instance-00000045/ramdisk</initrd> </os> <disk type='file'> <driver type='qcow2'/> <source file='/opt/nova-state/instances/instance-00000045/disk'/> <target dev='vda' bus='virtio'/> </disk> Booting fails Creating root device. Mounting root filesystem. mount: could not find filesystem '/dev/root' If I then destroy the VM, change root to be /dev/sda and target dev=sda with bus=ide things boot properly. Kernel and ramdisk being used to boot are these vmlinuz-2.6.18-194.26.1.0.1.el5 initrd-2.6.18-194.26.1.0.1.el5.img I even tried Oracle's 2.6.32 kernels with same results. Underlying host OS is Oracle EL 5.5 Any clues ? Vladimir

1 1

OT: Recommendations for a virtual storage server
by carlopmart 02 Feb '11

02 Feb '11

Hi all, I need to install a virtual machine acting as a virtual storage server under CentOS 5.x (using kvm, xen, virtualbox or vmware). This virtual storage machine needs to server storage to another ESXi server and at the same time to the host where is installed. This is due to the limitations of hardware I have available. Both hosts needs to server several machines. It is very important that the virtual machine consumes the least resources possible (host has 5GB RAM and i need to run three virtual machines minimum, including this storage server as a virtual machine). What can be better solution: CentOS, NexentaStor, openfiler ...?? Many thaks. -- CL Martinez carlopmart {at} gmail {d0t} com

4 4

KVM and USB support
by MargoAndTodd 30 Jan '11

30 Jan '11

Hi All, Can anyone with access to RHEL 6 tell me if the "official" KVM supports USB ports under Windows guests? (I would like to be able to operate Logitech's universal remote.) Many thanks, -T

1 0

How to send sysrq on "virsh console"
by David Knierim 27 Jan '11

27 Jan '11

I have a KVM guest running on CentOS 5.5 that is in a bad state. I would like to dump the kernel information using magic-sysrq commands, but I cannot figure out how to send a break on the virtaul serial port provided by "virsh console". The guest is a standard install that will respond if I can send a break on the virtual serial port. Is it possible to send a break on the virtual serial port? Thanks, David

1 0

cluster of virtual machines using libvirt/kvm + Gluster
by iarly selbir 27 Jan '11

27 Jan '11

Hi guys, I posted this question at virt list on Fedora Project but I guess its a best place to ask help for my problem. I'm trying to set up two kvm/libvirt hosts, I installed the set of packages contained in @kvm and @clustering groups, downloaded and installed glusterfs version 3.1.2, configured the cluster ( all working ), configured the gluster volume and mounted it on /var/lib/libvirt/images. The problem is when I try to create the VM, after click in finish(virt-manager) it returns the following error: Unable to complete install 'libvirt.libvirtError internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/test.img Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/create.py", line 724, in do_install dom = guest.start_install(False, meter = meter) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install self.domain = self.conn.createLinux(install_xml, 0) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 974, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/test.img # /var/log/messages Jan 18 05:36:05 kvmsrv001 libvirtd: 05:36:05.227: error : internal error Timed out while reading console log output Jan 18 05:36:05 kvmsrv001 libvirtd: 05:36:05.227: error : internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/test.img the image disk was created, but the domain(vm) is not. does someone experienced with this error? If I umount the gluster partition and use local disk the vm creation works fine. Any suggestion will be appreciated. - - iarlyy selbir :wq!

4 5

Francisco Pérez invited you to Dropbox
by Dropbox 25 Jan '11

25 Jan '11

Francisco Pérez wants you to use Dropbox to sync and share files online and across computers. Get started here: http://www.dropbox.com/link/20.lES1DC1WLp/NjYyMTI3NTcxNw?src=referrals_bulk6 - The Dropbox Team ____________________________________________________ To stop receiving invites from Dropbox, please go to http://www.dropbox.com/bl/05f2e2971bc2/centos-virt%40centos.org

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