Re: [Xen-users] unable to access Linux HVM via xm console - Couldnotread tty from store: No such file or directory

[Rudi Ahlers <Rudi@xxxxxxxxxxx>]

Nick Couchman wrote:
> Yes, HVM - a hardware virtual machine - is the way to run unmodified 
> guest O/Ss on Xen.  If your O/S has a modified kernel available, 
> though, you should use that.  CentOS 5.1 definitely has a PV 
> (modified) kernel available, so is there some reason you want to run 
> your CentOS 5.1 domU in an HVM (unmodified), or maybe you should 
> switch over to the modified kernel for that domU?
> >>> On 2008/06/16 at 22:20, Rudi Ahlers <Rudi@xxxxxxxxxxx> wrote:
> Nick Couchman wrote:
> > HVM = fully virtualized.  The question is, why are you using fully
> > virtualized domUs?  Why not paravirtualized (PV)?
> >
> > >>> On 2008/06/16 at 16:07, Rudi Ahlers <Rudi@xxxxxxxxxxx> wrote:
> > Itamar - IspBrasil wrote:
> > > why you're using hvm ? its slow
> > >
> > >
> > >
> > > Rudi Ahlers wrote:
> > >> Hi all
> > >>
> > >> I'm running CentOS 5.1 x64 + Xen 3.0 & I have setup a CentOS 5.1 x64
> > >> domU as a HMV. For the setup I used VNC, but I would prefer to be
> > >> able to access it via "xm console cPanel" via SSH directly.
> > >>
> > >> Here's the output cPanel HVM:
> > >>
> > >> [root@pc-00059 ~]# more /etc/xen/cPanel
> > >> name = "cPanel"
> > >> uuid = "ff940501-507d-04ca-e590-831e79ba0397"
> > >> maxmem = 6144
> > >> memory = 6144
> > >> vcpus = 2
> > >> builder = "hvm"
> > >> kernel = "/usr/lib/xen/boot/hvmloader"
> > >> boot = "c"
> > >> pae = 1
> > >> acpi = 0
> > >> apic = 0
> > >> on_poweroff = "destroy"
> > >> on_reboot = "restart"
> > >> on_crash = "restart"
> > >> device_model = "/usr/lib64/xen/bin/qemu-dm"
> > >> sdl = 0
> > >> vnc = 0
> > >> vncunused = 2
> > >> #disk = [
> > >>
> > 
> "phy:/dev/data/cPanel,hda,w","file:/data/storage/CentOS-5.1-x86_64-bin-1of7.iso,ioemu:hdc:cdrom,r" 
>
> >
> > >> ]
> > >> disk = [ "phy:/dev/data/cPanel,hda,w" ]
> > >> vif = [ "mac=00:16:3e:4e:9b:48,bridge=xenbr0,type=ioemu" ]
> > >> serial = "pty"
> > >> usb = 1
> > >> usbdevice = 'tablet'
> > >>
> > >>
> > >> When I try and connect to it via console, I get the following:
> > >> [root@pc-00059 ~]# xm console cPanel
> > >> xenconsole: Could not read tty from store: No such file or directory
> > >> [root@pc-00059 ~]#
> > >>
> > >>
> > >>
> > >> Reading through all the email archives, I found a few similar
> > >> problems, but the suggested fixes doesn't help. Does anyone know how
> > >> to get xm console to work for HVM type domU's ?
> > >>
> > >>
> > >
> > >
> > >
> > mmm, now that I think of it. I setup fully virtualized hosts, not HVM -
> > my bad.....
> >
> > --
> >
>
> ok, so I had the right words :)
>
> as far as I understand, HVM is the only way to get Windows, or rather
> unmodified OS',  installed onto Linux, right? Or is there another way? I
> setup Windows like this, and simply copied the Windows HMV
> (/etc/xen/windows2003) to a new one for Linux (/etc/xen/cPanel) and
> installed Linux onto it.
>
> Should I rather have used a non-virtualized (is this referred to as
> paravirtualized ?) installation? But would I then be able to install say
> Ubuntu onto CentOS as a PV? Doesn't Ubuntu use a different kernel than
> the Red Hat family (Red Hat, Fedora Core, CentOS)?
>
> --
No, no reason why I want to run CentOS unmodified. It was just easy to 
setup :) I copied the one HVM config file to a new one and it was up. So 
I guess I'll setup a new paravirtualized centos then :)
--

Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
Check out my technical blog, http://blog.softdux.com for Linux or other 
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