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1612 discussions

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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Matthias Lorch ist außer Haus.
by matthias.lorch＠kzvrlp.de 29 Mar '10

29 Mar '10

Ich werde ab 29.03.2010 nicht im Büro sein. Ich kehre zurück am 06.04.2010. Bitte wenden Sie sich in dringenden Fällen an Herrn Roth, 0261 / 9120 - 258 Vielen Dank Gruß M.Lorch

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Xen HVM domU won't start since updates to 2.6.18-164.15.1 kernels
by Aaron Clark 28 Mar '10

28 Mar '10

I have a dom0 machine running CentOS 5.4 with all the latest updates using Xen as my hypervisor. I am using Xen in part because this machine was set up prior to KVM being included in RHEL, and in part because KVM's network bridging configuration is not nearly as simple as Xen's. The dom0 machine is a headless Mac Mini and I do all of my VM management via virsh from the command line. I have two hvm domU's: * A web server running CentOS 5.4 * A mail server running Gentoo Both VM's are backed by LV's on the dom0 but do not use LVM in the domU. Both have virtually identical libvirt configurations (differing by expected things like name, UUID, NIC MAC, VNC port, etc). The web server domU (WSdomU hereafter) does not start since applying the most recent kernel update (kernel-xen-2.6.18-164.15.1.el5.x86_64 and kernel-2.6.18-164.15.1.el5.x86_64 for the dom0 and WSdomU respectively). By 'not start' I mean it appears to be running but it does not use an CPU cycles, does not bring up a graphical console, and does not respond on the network. The WSdomU is listed as no state rather than the normal running or blocked in xentop. The mail server domU starts fine and functions normally. Here are the steps I have taken so far that did not solve the problem: * Reboot the dom0 to see if things come up on their own * Attempted to connect to the WSdomU's graphical (VNC) console from the dom0 * Check xen dmesg on dom0 * Check xend logs (a cursory viewing did not show anything blatant; specific suggestions of things to look for would be appreciated) * Shutdown the mail server domU and attempt to start the WSdomU * Use kpartx to access the partitions of the domU o Tried switching grub to use the previous kernel * Check the SELinux labels on backing LV's (they're the same) * Set SELinux to permissive and attempt to start the WSdomU * Use virsh edit to try tweaking the WSdomU config * virsh undefine, reboot, virsh define the WSdomU config * Use fdisk on the LV to ensure it has the correct partition layout * dd the WSdomU LV to an .img file, copy it to my Fedora desktop and run it under KVM (works fine) * dd the .img file to a new LV and create a new libvirt config xml (fails to start) Sample config used to attempt a reconfiguration: <domain type='xen'> <name>Webserver</name> <os> <type>hvm</type> <loader>/usr/lib/xen/boot/hvmloader</loader> <boot dev='hd'/> </os> <memory>262144</memory> <vcpu>1</vcpu> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <features> <acpi/> <apic/> <pae/> </features> <devices> <emulator>/usr/lib64/xen/bin/qemu-dm</emulator> <interface type='bridge'> <source bridge='xenbr0'/> <script path='vif-bridge'/> </interface> <disk type='block'> <source dev='/dev/mapper/SystemsVG-Webserver'/> <target dev='hda'/> </disk> <graphics type='vnc' /> </devices> </domain> What steps should I take next to debug this? Aaron -- "The goblins are in charge of maintenance? Why not just set it on fire now and call it a day?" --Whip Tongue, Viashino Technician

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PVM Ubuntu and xconsole error with XEN+CentOS
by Fernando Castillo Ortiz 24 Mar '10

24 Mar '10

Hi, I tell you my problem: I've installed a Ubuntu's HVM guest in CentOS with XEN, then I convert my HVM to PVM based in this tutto : http://www.asplund.nu/xencluster/xen-convert-hvm-to-pvm.html After this modification everythings it runs fine but I have a problem with xconsole, I don't see anything when I run the command "xm console ID" , I only see the boot proccess and the last line that I can see it's : * Running local boot scripts (/etc/rc.local) [ OK ] I attached you my config file PS: Sorry for my English -- Fernando Castillo Ortiz Área de Operaciones Emergya Consultoría Tel. +34 951 210 400 +34 663 366 796 Fax. +34 954 51 64 73 http://www.emergya.es

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Silly question about KVM
by Scot P. Floess 18 Mar '10

18 Mar '10

I was wondering, if I do not have hardware that natively supports full virtualization...and I choose to use KVM, will my VMs be running in some form of chip emulation (and therefore terribly slow). To date, I've been using Xen and am very comfortable with it. I have some fears that later whenever Xen is dropped - I'll have to consider KVM. Also, will Xen be carried forward should Xen be dropped from RHEL? -- Scot P. Floess 27 Lake Royale Louisburg, NC 27549 252-478-8087 (Home) 919-890-8117 (Work) Chief Architect JPlate http://sourceforge.net/projects/jplate Chief Architect JavaPIM http://sourceforge.net/projects/javapim Architect Keros http://sourceforge.net/projects/keros

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Re: [CentOS-virt] moving from Xen to KVM
by Christopher G. Stach II 18 Mar '10

18 Mar '10

----- "Dave Augustus" <davea(a)ingraftedsoftware.com> wrote: > I finally realized that when running Xen and in Dom0, Xen hides the > AMD-V in /proc/cpuinfo Really? dom0: flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow constant_tsc pni monitor cx16 lahf_lm cmp_legacy svm cr8_legacy guest: flags : fpu tsc msr pae mce cx8 apic mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow constant_tsc pni monitor cx16 lahf_lm cmp_legacy svm cr8_legacy > (...more reasons to move to KVM) I have a hunch that you are going to do whatever you are told to do and that you really have no idea what is going on. Can we get more "Hey, I'm told KVM is cool so I'm migrating all of my production servers to it because the free OS of my choice may not support it in a year or two after I leave my current suckjob position and I hear, since I don't read mainline kernel mailing lists religiously and keep only a superficial idea in my head about kernel development, since I really have no idea what 'kernel development' means, that KVM is the only Jesus-approved way of doing things" threads? None of you seem to have have a head for any of this, it seems. Maybe you're just working for Billy's Interwebs-r-Us and keeping Sally's Nail Shop going strong, but the last time I checked, the "ent" in CentOS stood for "enterprise". Here are a few tips: 1. Fuck KVM. 2. Stick with Xen because there is quite a lot of time until 5 is EOL'd and if you haven't noticed, it's actually a mature technology. 3. Figure out what you are going to do with Sally's Nail Shop in the meantime. If you have time to fuck everything up in your environment with KVM, you can probably save 20% or more optimizing your environment and even more with proper capital investments and training. 4. Figure out how either a) non-critical/enterprise services would ever be served by KVM's features or lack thereof, or b) you are going to CYA when you can't guarantee an SLA. 5. Spend more time on KVM dev lists instead of posting here and annoying others with your butthurt KVM-won't-work posts, as it's not even supported upstream. -- Christopher G. Stach II http://ldsys.net/~cgs/

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