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1608 discussions

date problem on my virtual centos server
by John Berrocal 14 Apr '10

14 Apr '10

I have a Centos server 5.4 64 bits with xen server, and It has 6 virtual servers, windows 2003 and centos 5.4 64bits. One of my servers have a special problem with the time. It is a centos server 5.4 64 bits, with apache, and mysql and dokuwiki running. When somebody update the content in the wiki apps, it take the time of the server and always the time is forward than the real time, for example right now the time of that centos server is and hour more than the current time. I was changing manually the time, and also I update the packages to fix any possible bug, but I still have the same problem. I checked the time on the host server and it has the current time and my other, Have you ever had the same problem? Thanks in advance for your answers -- John S. Berrocal

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Re: [CentOS-virt] Xen HVM domU won't start since updates to 2.6.18-164.15.1 kernels
by Christopher G. Stach II 12 Apr '10

12 Apr '10

----- "Aaron Clark" <ophidian(a)ophidian.homeip.net> wrote: > qemu: could not open serial device 'none' http://os-drive.com/files/docbook/xen-faq.html#serial_console_hvm Does the LV show that it's open (or ever changes state) when the VM attempts to boot? Did you try taking a snapshot of the LV and mucking around with the xen configuration to see if anything changes? Did you update anything else on the machine, like perhaps the BIOS? Can you mount the VM's filesystem? Is its partition table okay? How about the boot loader? -- Christopher G. Stach II http://ldsys.net/~cgs/

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kickstart + domU for static IP
by john maclean 07 Apr '10

07 Apr '10

I've set up a local webserver to store kickstart files for domUs. All parameters are respected apart from the network settings. DomU always gets DHCP. Can any one help to unwrap this one? Does one add hostname, ip, netmask and gateway values to the /etc/xen/blah.cfg file? # ---- domU kickstart file ----# url --url http://192.168.1.120/centos/5/os/i386 lang en_US.UTF-8 keyboard uk network --device=eth0 --bootproto=static --netmask=255.255.255.0 --ip=192.168.1.115 --gateway=192.168.1.1 --nameserver=192.168.1.1 --hostname=dns1 --onboot=yes rootpw blahblahblah firewall --enabled --port=22:tcp authconfig --enableshadow --enablemd5 selinux --disabled timezone --utc Europe/London bootloader --location=mbr --driveorder=xvda --append="console=xvc0" clearpart --all --initlabel --drives=xvda part /boot --fstype ext3 --size=100 --ondisk=xvda --asprimary part / --fstype ext3 --size=10240 --grow --ondisk=xvda --asprimary part swap --size=1024 --ondisk=xvda --asprimary %packages @base @core # sudo cat /etc/xen/dns1.cfg ramdisk = "/home/jayeola/virt/images/centos_domU/initrd.img" kernel = "/home/jayeola/virt/images/centos_domU/vmlinuz"name = "dns1" maxmem = 1024 memory = 1024 vcpus = 1 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" disk = [ "tap:aio:/home/jayeola/virt/images/centos_domU/dns1.img,xvda,w" ] vif = [ "bridge=xenbr0,script=vif-bridge" ] extra = "text ks=http://192.168.1.120/dns1-ks.cfg" -- John Maclean 07739 171 531 MSc (DIC) Enterprise Linux Systems Engineer

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Re: [CentOS-virt] kickstart + domU for static IP
by Christopher G. Stach II 06 Apr '10

06 Apr '10

----- "john maclean" <jayeola(a)gmail.com> wrote: > I've set up a local webserver to store kickstart files for domUs. All > parameters are respected apart from the network settings. DomU always > gets DHCP. Can any one help to unwrap this one? Does one add > hostname, > ip, netmask and gateway values to the /etc/xen/blah.cfg file? If you mean before kickstart is even run: > extra = "text ks=http://192.168.1.120/dns1-ks.cfg" extra = "... ip=..." -- Christopher G. Stach II http://ldsys.net/~cgs/

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CentOS and Xen 3.0.3
by Gilberto Nunes 05 Apr '10

05 Apr '10

Hi I install CentOS 5.4 and try to use Xen.... But when I deploy some VM with Virt-manager and specify 2 or more VCPUS to use, when start the vm it start with just one CPU... On this VM I install Windows 2003 Server... This the file of VM: name = "Avision" uuid = "625139bf-1ad3-86fc-45e6-e8efbb9db643" maxmem = 2048 memory = 2048 vcpus = 4 cpus = "0,1,2,3" builder = "hvm" kernel = "/usr/lib/xen/boot/hvmloader" boot = "c" pae = 1 acpi = 1 apic = 1 localtime = 1 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" device_model = "/usr/lib64/xen/bin/qemu-dm" usb = 1 usbdevice = "tablet" sdl = 0 vnc = 1 vncunused = 1 keymap = "pt-br" disk = [ "phy:/dev/etherd/e3.3,hda,w" ] vif = [ "mac=00:16:36:2f:fd:7c,bridge=xenbr0,script=vif-bridge,model=ne2k_pci" ] parallel = "none" serial = "pty" But, on windows I just see one CPU... I don't understand why this happen!! Thanks for any help -- Gilberto Nunes

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Kernel BUG
by Gilberto Nunes 05 Apr '10

05 Apr '10

Hi Every time I up a VM with Xen 3.0.3 on CentOS 5.4 I get this messages on kernel: Apr 5 09:03:07 zebra kernel: BUG: warning at lib/kref.c:32/kref_get() (Not tainted) Apr 5 09:03:07 zebra kernel: Apr 5 09:03:07 zebra kernel: Call Trace: Apr 5 09:03:07 zebra kernel: [<ffffffff8023824d>] kref_get+0x38/0x3d Apr 5 09:03:07 zebra kernel: [<ffffffff8025a440>] kobject_get+0x12/0x17 Apr 5 09:03:07 zebra kernel: [<ffffffff8024b57f>] blk_get_queue+0x1f/0x26 Apr 5 09:03:07 zebra kernel: [<ffffffff887198f7>] :blkbk:dispatch_rw_block_io+0x4db/0x5a2 Apr 5 09:03:07 zebra kernel: [<ffffffff80340368>] __next_cpu+0x19/0x28 Apr 5 09:03:07 zebra kernel: [<ffffffff8026082b>] error_exit+0x0/0x6e Apr 5 09:03:07 zebra kernel: [<ffffffff8028792a>] find_busiest_group+0x1db/0x44d Apr 5 09:03:07 zebra kernel: [<ffffffff802883c0>] dequeue_task+0x18/0x37 Apr 5 09:03:07 zebra kernel: [<ffffffff80288407>] deactivate_task+0x28/0x5f Apr 5 09:03:07 zebra kernel: [<ffffffff8026ef47>] monotonic_clock+0x35/0x7b Apr 5 09:03:07 zebra kernel: [<ffffffff80262dd3>] thread_return+0x6c/0x113 Apr 5 09:03:07 zebra kernel: [<ffffffff80340af5>] kobject_cleanup+0x39/0x7e Apr 5 09:03:07 zebra kernel: [<ffffffff88719d2c>] :blkbk:blkif_schedule+0x36e/0x456 Apr 5 09:03:07 zebra kernel: [<ffffffff887199be>] :blkbk:blkif_schedule+0x0/0x456 Apr 5 09:03:07 zebra kernel: [<ffffffff8029bdab>] keventd_create_kthread+0x0/0xc4 Apr 5 09:03:07 zebra kernel: [<ffffffff80233bef>] kthread+0xfe/0x132 Apr 5 09:03:07 zebra kernel: [<ffffffff80260b2c>] child_rip+0xa/0x12 Apr 5 09:03:07 zebra kernel: [<ffffffff8029bdab>] keventd_create_kthread+0x0/0xc4 Somebody know what is going on???? Thanks for any help -- Gilberto Nunes

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How to Decrease Xen file space?
by Wendy William 05 Apr '10

05 Apr '10

Hi, I read many articles about how to increase Xen file-space but I need to decrease the file size. Any suggestion? Regards

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How to change to allocated file space in Xen?
by Wendy William 05 Apr '10

05 Apr '10

When I create a new VPS, I choose not to Allocated Disk space for the file-size. Now I need to make my VPS to allocated the file-space, is it possible?

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Re: [CentOS-virt] SOLVED! Xen HVM domU won't start since updates to 2.6.18-164.15.1 kernels
by Christopher G. Stach II 01 Apr '10

01 Apr '10

----- "Aaron Clark" <ophidian(a)ophidian.homeip.net> wrote: > On 03/30/2010 07:33 AM, Sergio Charpinel Jr. wrote: > > Aaron, > > > > Seems to be something related to your block device. > > > > Try this config file: > > Sergio, > > I just tried this config and it booted fine: > name = "Belldandy" > maxmem = 256 > memory = 256 > vcpus = 1 > builder = "hvm" > kernel = "/usr/lib/xen/boot/hvmloader" > boot = "c" > pae = 1 > on_poweroff = "destroy" > on_reboot = "restart" > on_crash = "restart" > device_model = "/usr/lib64/xen/bin/qemu-dm" > disk = [ "phy:/dev/SystemsVG/Belldandy,hda,w" ] > vif = [ "mac=00:16:3e:29:65:46,bridge=xenbr0,script=vif-bridge" ] > vnc = 1 > > Attached is the generated virsh xml from the above. > > I'm going to tinker with this for a bit to try and figure out what > difference from the previous config is actually the cause of the > issue. > I just had the other, formerly working VM, bail with the same symptoms > once I got this one work. The workaround is nice but I definitely > want to isolate this bug now. Try mucking with the acpi and apic flags. IIRC, they both default to 0 in this version of Xen so by eliding them, you turned them off. On the right machine, either will screw up HVM. -- Christopher G. Stach II http://ldsys.net/~cgs/

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Re: [CentOS-virt] Xen HVM domU won't start since updates to 2.6.18-164.15.1 kernels
by Christopher G. Stach II 30 Mar '10

30 Mar '10

----- "Aaron Clark" <ophidian(a)ophidian.homeip.net> wrote: > What steps should I take next to debug this? Downgrade back to where you were bit by bit (or just guess that it's dom0's kernel) and see when it starts working again. What does the busted guest say when it tries to boot while you watch its [serial] console? Does the dom0 ever unpause the guest? (It should say in the logs.) -- Christopher G. Stach II http://ldsys.net/~cgs/

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