Re: [Xen-users] pv_ops Dom0 kernel for DomU?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, May 17, 2010 at 02:16:31PM +0100, Ian Tobin wrote:
> Ok thanks for the info.
> 
> One last question :) the DomU now boots but its gets as far as 
> 
> Running local boot scripts (/etc/rc.local) 
> 
> Then hangs.  I can ssh to it ok but the console doesn't go any further, is 
> there a parameter i need to change?
> 

http://wiki.xensource.com/xenwiki/XenCommonProblems

-- Pasi

> Thanks
> 
> Ian
> 
> 
> 
> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> Sent: 17 May 2010 10:04
> To: Ian Tobin
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> 
> On Mon, May 17, 2010 at 10:00:29AM +0100, Ian Tobin wrote:
> > No! Changed it and now boots... phew.
> > 
> > Just out of interest when did the xvda option replace the sda/hda ?
> > 
> 
> It's been like that since the beginning of upstream pvops Xen domU kernel 
> support.. 
> aka since Linux 2.6.24.
> 
> Note that some distros have shipped non-pvops kernels, like Debian lenny 
> 2.6.26-2-xen,
> which is based on the old Xenlinux patches.
> 
> > Thanks for helping me get it booted up, much appreciated!
> > 
> 
> Good that it works now.
> 
> -- Pasi
> 
> > Ian
> > 
> > 
> > 
> > -----Original Message-----
> > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > Sent: 17 May 2010 09:58
> > To: Ian Tobin
> > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > 
> > On Mon, May 17, 2010 at 09:52:37AM +0100, Ian Tobin wrote:
> > > Oh right, i hadn't realised it had changed.  I have updated the config 
> > > but am getting the same error :(
> > > 
> > 
> > Did you change the root= line aswell? 
> > 
> > -- Pasi
> > 
> > > 
> > > 
> > > -----Original Message-----
> > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > Sent: 17 May 2010 09:27
> > > To: Ian Tobin
> > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > 
> > > On Mon, May 17, 2010 at 09:23:53AM +0100, Ian Tobin wrote:
> > > > #  -*- mode: python; -*-
> > > > kernel = "/boot/vmlinuz-2.6.33.4"
> > > > ramdisk = "/boot/initrd.img-2.6.34.4"
> > > > #kernel = "/boot/vmlinuz-2.6.18.8-xen"
> > > > memory = 128
> > > > name = "dbsrv1"
> > > > vif = ['bridge=xenbr0' ]
> > > > disk = ['phy:/dev/XEN/dbsrv1,hda1,w','phy:/dev/XEN/dbsrv1swap,sda2,w']
> > > >
> > > 
> > > The problem is on the disk line.
> > > You need to use xvda1 and xvda2, not hda1 and sda2.
> > > 
> > > xvd = Xen Virtual Disk.
> > > 
> > > -- Pasi
> > > 
> > > 
> > > > ip="..."
> > > > netmask="..."
> > > > gateway="..."
> > > > hostname = "dbsrv1"
> > > > root = "/dev/hda1 ro"
> > > > extra = "3 xencons=tty"
> > > > 
> > > > thanks
> > > > 
> > > > Ian
> > > > 
> > > > 
> > > > 
> > > > -----Original Message-----
> > > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > > Sent: 17 May 2010 09:19
> > > > To: Ian Tobin
> > > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > > 
> > > > On Mon, May 17, 2010 at 09:17:24AM +0100, Ian Tobin wrote:
> > > > > Ive never used pygrub before.
> > > > > 
> > > > > I did try chrooting but it was complaining about the initramfs 
> > > > > command not being found.
> > > > > 
> > > > > So if the XEN stuff is ok, what else do you think it could be?
> > > > > 
> > > > 
> > > > Paste your /etc/xen/<guest> cfgfile.
> > > > 
> > > > -- Pasi
> > > > 
> > > > > Thanks
> > > > > 
> > > > > Ian
> > > > > 
> > > > > 
> > > > > 
> > > > > -----Original Message-----
> > > > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > > > Sent: 17 May 2010 09:02
> > > > > To: Ian Tobin
> > > > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > > > 
> > > > > On Mon, May 17, 2010 at 08:54:35AM +0100, Ian Tobin wrote:
> > > > > > Hi,
> > > > > > 
> > > > > > How do you gernerate it from DomU when it wont boot?
> > > > > > 
> > > > > 
> > > > > Well.. mount + chroot + mkinitrd from dom0 might work.
> > > > > 
> > > > > I prefer installing domUs using the distro installer so things
> > > > > like this get handled automatically. 
> > > > > 
> > > > > And I prefer using Xen pygrub so I don't have to have the 
> > > > > kernel+initrd in dom0 at all!
> > > > > 
> > > > > > Here is the domU config
> > > > > > 
> > > > > > CONFIG_XEN=y
> > > > > > CONFIG_XEN_MAX_DOMAIN_MEMORY=32
> > > > > > CONFIG_XEN_SAVE_RESTORE=y
> > > > > > CONFIG_XEN_DEBUG_FS=y
> > > > > > CONFIG_XEN_BLKDEV_FRONTEND=y
> > > > > >
> > > > > 
> > > > > So the xen-blkfront is compiled in, you don't necessarily need an 
> > > > > initrd then.
> > > > > 
> > > > > 
> > > > > > CONFIG_NETXEN_NIC=m
> > > > > > CONFIG_XEN_NETDEV_FRONTEND=y
> > > > > > CONFIG_XEN_KBDDEV_FRONTEND=y
> > > > > > CONFIG_HVC_XEN=y
> > > > > > CONFIG_XEN_FBDEV_FRONTEND=y
> > > > > > CONFIG_XEN_BALLOON=y
> > > > > > CONFIG_XEN_SCRUB_PAGES=y
> > > > > > CONFIG_XEN_DEV_EVTCHN=y
> > > > > > CONFIG_XENFS=y
> > > > > > CONFIG_XEN_COMPAT_XENFS=y
> > > > > > CONFIG_XEN_SYS_HYPERVISOR=y
> > > > > > 
> > > > > 
> > > > > -- Pasi
> > > > > 
> > > > > > Thanks
> > > > > > 
> > > > > > Ian
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > -----Original Message-----
> > > > > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > > > > Sent: 17 May 2010 08:51
> > > > > > To: Ian Tobin
> > > > > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > > > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > > > > 
> > > > > > On Mon, May 17, 2010 at 08:40:34AM +0100, Ian Tobin wrote:
> > > > > > > Hey Pasi,
> > > > > > > 
> > > > > > > Ive downloaded 2.6.33.4 from kernel.org.  The XEN stuff is 
> > > > > > > compiled as static and so is raid,i have created a initrd image 
> > > > > > > by issueing the following (Debian OS)
> > > > > > > 
> > > > > > > Mkinitramfs -o /boot/initrd.img-2.6.33.4 2.6.33.4    
> > > > > > > 
> > > > > > 
> > > > > > Did you generate the initrd in dom0? You should generate it in 
> > > > > > domU.. 
> > > > > > then you won't have all the dom0-specific md-raid stuff etc there.
> > > > > > 
> > > > > > > When booting i get the same error
> > > > > > > 
> > > > > > > 
> > > > > > > Loading, please wait...
> > > > > > > Begin: Loading essential drivers ... done.
> > > > > > > Begin: Running /scripts/init-premount ... FATAL: Error inserting 
> > > > > > > fan (/lib/modules/2.6.33.4/kernel/drivers/acpi/fan.ko): No such 
> > > > > > > device
> > > > > > > FATAL: Error inserting thermal 
> > > > > > > (/lib/modules/2.6.33.4/kernel/drivers/acpi/thermal.ko): No such 
> > > > > > > device
> > > > > > > done.
> > > > > > > Begin: Mounting root file system ... Begin: Running 
> > > > > > > /scripts/local-top ... Begin: LoadingFailure: failed to load 
> > > > > > > module raid1.
> > > > > > > done.
> > > > > > > Begin: Assembling all MD arrays ... [    1.991528] md: md0 
> > > > > > > stopped.
> > > > > > > mdadm: no devices found for /dev/md0
> > > > > > > [    2.004392] md: md1 stopped.
> > > > > > > mdadm: no devices found for /dev/md1
> > > > > > > [    2.021788] md: md2 stopped.
> > > > > > > mdadm: no devices found for /dev/md2
> > > > > > > [    2.047173] md: md3 stopped.
> > > > > > > mdadm: no devices found for /dev/md3
> > > > > > > Failure: failed to assemble all arrays.
> > > > > > > done.
> > > > > > > Begin: Waiting for udev to process events ... done.
> > > > > > > done.
> > > > > > > Begin: Waiting for root file system ...
> > > > > > > 
> > > > > > > 
> > > > > > > Im not sure if i have missed something out, any ideas?
> > > > > > > 
> > > > > > 
> > > > > > Please paste "grep XEN .config" from the domU kernel.
> > > > > > 
> > > > > > -- Pasi
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > > Cheers
> > > > > > > 
> > > > > > > Ian
> > > > > > > 
> > > > > > > 
> > > > > > > -----Original Message-----
> > > > > > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > > > > > Sent: 14 May 2010 21:18
> > > > > > > To: Ian Tobin
> > > > > > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > > > > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > > > > > 
> > > > > > > On Fri, May 14, 2010 at 09:05:02PM +0100, Ian Tobin wrote:
> > > > > > > > Oh right, thats new to me. Ive never had to do that before, is 
> > > > > > > > that new to the pv_ops?
> > > > > > > > 
> > > > > > > 
> > > > > > > It's not really pvops specific.. it's more about the fact that 
> > > > > > > nowadays all/most
> > > > > > > drivers are built as modules - so you need to have an initrd 
> > > > > > > image to load them.
> > > > > > > 
> > > > > > > If you compiled all the xen* stuff as static/built-in then you 
> > > > > > > wouldn't need an initrd..
> > > > > > > 
> > > > > > > > Many thanks for the info, you learn something new everyday :)
> > > > > > > > 
> > > > > > > 
> > > > > > > Np.
> > > > > > > 
> > > > > > > -- Pasi
> > > > > > > 
> > > > > > > > Ian
> > > > > > > > 
> > > > > > > > 
> > > > > > > > -----Original Message-----
> > > > > > > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > > > > > > Sent: 14 May 2010 20:50
> > > > > > > > To: Ian Tobin
> > > > > > > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > > > > > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > > > > > > 
> > > > > > > > On Fri, May 14, 2010 at 08:45:03PM +0100, Ian Tobin wrote:
> > > > > > > > > Ah ok, what would be the procedure to do that? 
> > > > > > > > > 
> > > > > > > > > Thanks
> > > > > > > > > 
> > > > > > > > 
> > > > > > > > Usually it's best to generate the initrd image in the guest,
> > > > > > > > and use the distro provided domU kernel.
> > > > > > > > 
> > > > > > > > If you install the guest using the guest distro installer it'll 
> > > > > > > > do it for you automatically.
> > > > > > > > 
> > > > > > > > You can also do it from dom0.. example for centos/rhel/fedora:
> > > > > > > > 
> > > > > > > > mkinitrd -v -f --with-module=xenblk --with-module=xennet 
> > > > > > > > /boot/initrd-domU-version.img <kernelversion>
> > > > > > > > 
> > > > > > > > -- Pasi
> > > > > > > > 
> > > > > > > > > Ian
> > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > -----Original Message-----
> > > > > > > > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > > > > > > > Sent: 14 May 2010 20:32
> > > > > > > > > To: Ian Tobin
> > > > > > > > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > > > > > > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > > > > > > > 
> > > > > > > > > On Fri, May 14, 2010 at 08:27:50PM +0100, Ian Tobin wrote:
> > > > > > > > > > Ok strange. I have set the DomU config to use the kernel i 
> > > > > > > > > > use for Dom0 and when booting it gets so far to mount the 
> > > > > > > > > > root filesystem and then complains that it cant load the 
> > > > > > > > > > raid1 module which then says it can't load md0, md1, md2 
> > > > > > > > > > and md3 which are my Dom0 software raid disks.
> > > > > > > > > > 
> > > > > > > > > > When i use the 2.6.8.18 kernel the domU boots fine.
> > > > > > > > > > 
> > > > > > > > > > I have in the config to use the initrd.img-2.6.32.12 ram 
> > > > > > > > > > disk but it doesn't work, am i missing something obvious?
> > > > > > > > > > 
> > > > > > > > > 
> > > > > > > > > Are you using the dom0 initrd for domU? 
> > > > > > > > > If you are, you shouldn't.
> > > > > > > > > 
> > > > > > > > > domU needs to have its own initrd that loads drivers for the 
> > > > > > > > > virtual hardware the Xen guest has..
> > > > > > > > > 
> > > > > > > > > -- Pasi
> > > > > > > > > 
> > > > > > > > > > Thanks
> > > > > > > > > > 
> > > > > > > > > > Ian
> > > > > > > > > > 
> > > > > > > > > > 
> > > > > > > > > > -----Original Message-----
> > > > > > > > > > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> > > > > > > > > > Sent: 14 May 2010 19:48
> > > > > > > > > > To: Ian Tobin
> > > > > > > > > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > > > > > > > > Subject: Re: [Xen-users] pv_ops Dom0 kernel for DomU?
> > > > > > > > > > 
> > > > > > > > > > On Fri, May 14, 2010 at 03:08:57PM +0100, Ian Tobin wrote:
> > > > > > > > > > >    Hi,
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > >    Just wondered if we can use the pv_ops kernel in 
> > > > > > > > > > > Jermeys tree for linux PV
> > > > > > > > > > >    domU or do we need to get that one from kernel.org ?
> > > > > > > > > > > 
> > > > > > > > > > 
> > > > > > > > > > Both will work.
> > > > > > > > > > 
> > > > > > > > > > upstream kernel.org kernels do have basic Xen PV domU 
> > > > > > > > > > support out-of-the-box.
> > > > > > > > > > Jeremy's tree has some additional features, like 
> > > > > > > > > > pcifront/pciback etc,
> > > > > > > > > > that are not yet upstream.
> > > > > > > > > > 
> > > > > > > > > > -- Pasi
> > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > >    Thanks
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > >    Ian
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > 
> > > > > > > > > > > _______________________________________________
> > > > > > > > > > > Xen-users mailing list
> > > > > > > > > > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > > > > > > > > > http://lists.xensource.com/xen-users
> > > > > > > > > > 
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> > > > > > 
> > > > > 
> > > > > 
> > > > 
> > > > 
> > > 
> > > 
> > 
> > 
> 
> 

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