xen March 2012

xen@lists.stg.fedoraproject.org

8 participants
8 discussions

execute commands from dom0 into domU
by silviu d 06 Jun '15

06 Jun '15

Hello, I was wondering if there is a way to execute commands from dom0 into domU without loging into domU with ssh. thanks

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Boot errors
by Chris Jones 17 May '12

17 May '12

I installed Fedora 16 and then ran: sudo yum install xen Xen installed without errors and I rebooted. In the Grub2 list I selected Xen 4.1.2 and then selected the option: Fedora Linux, with Xen 4.1.2 and Linux 3.3.0-4.fc16.x86_64 The boot process starts (i notice that loading ramdisk is very short) and then shortly thereafter the boot fails and the system reboots without any error. I tried checking the boot log but I'm not sure I'm looking at the right log. The only problem I see in the boot is Started SYSV: sandbox, xguest and other apps that want to use pam_names$ Failed to start Xenstored - daemon managing xenstore file system

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DomU nat router fails when DomUs on same host
by Virgil 10 May '12

10 May '12

Hi List, I have a strange issue someone, hopefully, can advise me on. I have two external connections into a host: em1 is behind a firewall machine which is connected to an internet backbone link, while em2 is an adsl all-u- can-eat deal with a cheap router. Both are bridged. So there's pem1 and pem2 which are connected to the em1 and em2 bridges respectively. There is a domU router which nats (and is connected to both bridges). Some domU servers (a variety of fc6 to fc16 32 and 64) default route to the domU router and go out the all-u-can-eat link. The issue is, I recent upgraded the host from Fedora8 to Fedora16, and now the domU machines that once happily used the all-u-can-eat link, no longer can. However, in an act of desperation, I moved one of the domUs to a backup machine. Nothing else changed. Bingo. That domU works. All resources are still on the original machine (i.e. the DB servers, the router, etc. etc.). It seems that the router does't seem to nat domUs on the same host. You move the domU off with comms going via em1 to another host and it works. Iptraf tracing seems to indicate that the TCP connection is setup. The first packet goes off and is acked. Then everything stops and eventually the tcp connection closes on the router, but the domU and the remote computer think the link is still up (at least that's what I think is happening). The domU's send queue ends up with lots of data in it according to 'netstat -ant' Only nat'd tcp connections are effected. Connections to machines on the same bridge work fine. Does this sound familiar to anyone? Thanks in advance Virgil

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Fedora Core 17 Xorg can't use /dev/fb0 when using Cirrus Logic VGA or Xen PVFB driver, Was:Re: [Xen-devel] irq problem with 3.3-rc3 on guest
by Konrad Rzeszutek Wilk 05 Apr '12

05 Apr '12

On Tue, Mar 27, 2012 at 11:14:30PM +0100, M A Young wrote: > On Mon, 26 Mar 2012, Konrad Rzeszutek Wilk wrote: > > >So how are you actually trying to install F17? > >I tried: > >virt-install --name F17 --ram 1024 --disk /dev/vg_guest/f17_32 --paravirt --location http://build/tftpboot/f17-i386/ > > > >and it showed the text console, and then rebooted thinking it was complete. > >When using a manual guest config: > >kernel="/root/vmlinuz-PAE" > >ramdisk="/root/initrd-PAE.img" > >append="console=hvc0 loglevel=8 root=http://build/tftpboot/f17-i386" > >memory=1024 > >maxvcpus = 2 > >vcpus = 2 > >disk = ['phy:/dev/vg_guest/f17_32,xvda,w'] > >vif = [ 'type=netfront, bridge=switch' ] > >vfb = [ 'vnc=1, vnclisten=0.0.0.0 ,vncunused=1'] > > > >I get this: > > 5.680395] Broadcom NetXtreme II iSCSI Driver bnx2i v2.7.0.3 (Jun 15, 2011) > >[ 5.681923] iscsi: registered transport (bnx2i) > >[ 5.696419] iscsi: registered transport (be2iscsi) > >[ 5.763271] dracut: FATAL: No or empty root= argument > >[ 5.764158] dracut: Refusing to continue > >[ 5.769524] dracut Warning: Signal caught! > >[ 5.772973] dracut Warning: dracut: FATAL: No or empty root= argument > >[ 5.776138] dracut Warning: dracut: Refusing to continue > >[ 5.782548] init used greatest stack depth: 5480 bytes left > >[ 5.783425] Kernel panic - not syncing: Attempted to kill init! > > > >so is there a new syntax for the root parameter now that is a LiveCD? > > Yes, the F17 install image is now a liveCD so you need to specify > this on the boot command line. This may be as simple as replacing > root= with root=live: So with extra="console=hvc0 loglevel=8 root=live:http://build/tftpboot/f17-i386/LiveOS/squashfs.img" I was able to succesfully install, but booting proved interestingly. When trying the 'pygrub' it would complain about the 'No OS loader', but if I ran it on the disk (pygrub /dev/vg_guest/f17_32) it would extract the payload properly. (This is with xen-4.1.2-6.fc16). So I worked around by taking those images directly: kernel="/var/run/xend/boot/boot_kernel.jIsJmr" ramdisk="/var/run/xend/boot/boot_ramdisk.I4rBjo" extra="root=/dev/mapper/vg_f17-lv_root ro rd.md=0 rd.lvm.lv=vg_f17/lv_swap SYSFONT=True KEYTABLE=us rd.lvm.lv=vg_f17/lv_root rd.luks=0 LANG=en_US.UTF-8 rd.dm=0" And when booting F17 either as HVM or PV, in both cases I got Xorg to tell me: (EE) FBDEV(0): FBIOBLANK: Invalid argument and freeze. The /dev/fb0 works fine thought by itslef, if do: "exec /sbin/init 3", then login on the VNC window and run 'fbterm' I get an nice framebuffer terminal. @M A: Is there a BZ for this or should I open one up with Xorg? I would think that KVM would hit the same exact problem when using the default VGA Cirrus framebuffer.

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mdadm fails to start raid in pv fc16 DomU on old host
by Virgil 30 Mar '12

30 Mar '12

I'm having a problem with mdraid running in a DomU. The issue is that mdraid declares one leg of the raid to have failed (when there's actually nothing wrong). DomU is fc16 - 3.2.2-1.fc16.x86_64 Dom0 is fc14 - 2.6.32.26-174.2.xendom0.fc12.x86_64 The same DomU running on Dom0 fc16 - 3.2.7-1.fc16.x86_64 runs perfectly. This appears to be a known issue, however the resolution (which seems to be to disable barriers on the fly) doesn't seem to work in this case. My question is: Is it possible to pass a parameter to the blkfront driver to ask it not to enable barrier during initialization? or is there another work around? [ 1.033058] blkfront: xvda: barrier: enabled [ 1.099153] xvda: xvda1 xvda2 [ 1.102871] blkfront: xvdb: barrier: enabled [ 1.130876] xvdb: xvdb1 xvdb2 [ 1.292692] md: bind<xvdb1> [ 1.413416] md: bind<xvda1> [ 1.419411] md: raid1 personality registered for level 1 [ 1.419836] bio: create slab <bio-1> at 1 [ 1.419953] md/raid1:md127: active with 2 out of 2 mirrors [ 1.419992] md127: detected capacity change from 0 to 7516180480 [ 1.424562] md127: unknown partition table [ 1.547284] EXT4-fs (md127): barriers disabled [ 1.553107] EXT4-fs (md127): mounted filesystem with ordered data mode. Opts: (null) [ 1.669483] dracut: Checking ext4: /dev/disk/by-label/rootfs [ 1.669592] dracut: issuing e2fsck -a /dev/disk/by-label/rootfs [ 1.690595] blkfront: barrier: empty write xvdb op failed [ 1.690611] blkfront: xvdb: barrier or flush: disabled [ 1.690628] end_request: I/O error, dev xvdb, sector 14682096 [ 1.690638] end_request: I/O error, dev xvdb, sector 14682096 [ 1.690646] md: super_written gets error=-5, uptodate=0 [ 1.690655] md/raid1:md127: Disk failure on xvdb1, disabling device. [ 1.690657] md/raid1:md127: Operation continuing on 1 devices. [ 1.690677] blkfront: barrier: empty write xvda op failed [ 1.690684] blkfront: xvda: barrier or flush: disabled [ 1.690696] end_request: I/O error, dev xvda, sector 14682096 [ 1.690705] end_request: I/O error, dev xvda, sector 14682096 [ 1.690713] md: super_written gets error=-5, uptodate=0 [ 1.692991] RAID1 conf printout: [ 1.692997] --- wd:1 rd:2 [ 1.693002] disk 0, wo:0, o:1, dev:xvda1 [ 1.693006] disk 1, wo:1, o:0, dev:xvdb1 [ 1.693010] RAID1 conf printout: [ 1.693013] --- wd:1 rd:2 [ 1.693016] disk 0, wo:0, o:1, dev:xvda1 [ 1.702896] dracut: rootfs: clean, 25635/454272 files, 293967/1835005 blocks [ 1.703682] dracut: Remounting /dev/disk/by-label/rootfs with -o ro [ 1.773347] EXT4-fs (md127): barriers disabled [ 1.774552] EXT4-fs (md127): mounted filesystem with ordered data mode. Opts: (null) [ 1.797159] dracut: Mounted root filesystem /dev/md127 [ 1.937620] dracut: Switching root

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Re: [Fedora-xen] Boot errors, https://bugzilla.redhat.com/show_bug.cgi?id=804347
by Konrad Rzeszutek Wilk 27 Mar '12

27 Mar '12

On Tue, Mar 27, 2012 at 11:23:41AM -0400, Josh Boyer wrote: > On Mon, Mar 26, 2012 at 10:53:40AM -0400, Konrad Rzeszutek Wilk wrote: > > n Sat, Mar 24, 2012 at 08:59:30PM -0400, Chris Jones wrote: > > > Thank you both for your response. > > > > > > That's probably the bug. I was hoping to find more answers here as after I > > > found that bug report. > > > > Ok, well, the patches should appear shortly in the FC16 kernel builds (I hope?) > > They were Acked-by Ingo, let me attach the patches to the BZ. > > > > Josh, is there a specific process for those patches to appear in F16? Should > > I email them to some kernel-backport(a)fedora.org email list? > > Did you CC the stable list on them? If so, we'd pick them up when Greg > releases 3.3.1. Not yet, waiting for Ingo to stick them in his tree first. But will surely CC GregKH to backport them. > > Otherwise, I'll grab all 3 (I think there were only 3) and get them into > F16 one way or another. OK. Thanks. > > josh

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F17 Kernel Badness
by Sean McNamara 12 Mar '12

12 Mar '12

Hi, My Fedora 17 3.3-rc4.git1 kernel boots on bare metal, but it dies very early on in the boot process when loading on top of Xen. It's got CONFIG_XEN_DOM0=y and all the other CONFIG_XEN* options are either "y" or "m". Linux panics with init[1] trap invalid opcode ip:7f99a072ff15 sp:7fffbf2a5088 error :0 in libc-2.15.so[7f99a05f8000+1ac000] init used greatest stack depth: 2392 bytes left Kernel panic - not syncing: Attempted to kill init! The kernel itself seems able to execute on top of Xen because I see a very normal-looking Xen init, then the screen blanks, then Linux initializes and starts executing early boot, stuff like the USB stack and SATA starts to come up, and then it tries to run the init process in userspace and it all comes crashing down. This is on Sandy Bridge hardware with all the CPU optional instruction sets enabled. Any ideas? Thanks, Sean

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Rebélate by self-management, first project of free software by which we bet all / Rebélate por la autogestión, primer proyecto de software libre por el que apostamos todas
by Orquidea Salt mas 02 Mar '12

02 Mar '12

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xen March 2012