Re: [Xen-users] Why 'xm console' not works sometimes?

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Tiago Cruz wrote:
> On Fri, 2007-11-30 at 15:18 +0200, Igor Chubin wrote:
>
>   
> > Because domain 0 know nothing about console of HVM-domains.
> > You can attach to the consoles of paravirtual domains, 
> > but not to HVM.
> >     
> Thank you, Igor!
> Really... you are correctly.
>
> But... I've installed one new ParaVirtual domain, only to test, and I
> can't console it.
>
> I've a lot of changes, like:
>
> Host: (DomO)
> title Red Hat Enterprise Linux Server (2.6.18-53.1.4.el5xen)
>         root (hd0,0)
>         kernel /xen.gz-2.6.18-53.1.4.el5 com2=115200, 8n1
>         module /vmlinuz-2.6.18-53.1.4.el5xen ro root=/dev/VolGroup00/LogVol00 
> rhgb quiet console=tty console=ttyS1115200
>         module /initrd-2.6.18-53.1.4.el5xen.img
>
>
> Guest: (DomU)
> title Red Hat Enterprise Linux Server (2.6.18-53.1.4.el5xen)
>         root (hd0,0)
>         kernel /boot/vmlinuz-2.6.18-53.1.4.el5xen ro root=LABEL=/ rhgb quiet 
> console=ttyS0 console=tty0
>         initrd /boot/initrd-2.6.18-53.1.4.el5xen.img
>
> [root@xenserver04 ~]# cat /etc/issue
> Red Hat Enterprise Linux Server release 5 (Tikanga)
> Kernel \r on an \m
>
> [root@xenserver04 ~]# rpm -qa | grep xen
> xen-3.0.3-41.el5
> xen-libs-3.0.3-41.el5
> kernel-xen-2.6.18-53.1.4.el5
>
> When I create the machine, I can see the grub, but after this I lost my
> connection, only can get using 'ssh' after boot.
>
> Any ideas?
>
>
>   
> > > What can I do for resolve this?
> > >       
> > I think, you can try this solution:
> >
> > 1. Redirect console inside HVM domain to serial console
> > 2. In the config file of your domain specify
> >
> > serial='pty'
> >
> > and after that try to connect using minicom or xm console.
> >     
> Ok... I'll try to get console on ParaVirt first :)
>   
To get the boot messages on the console please append the below 
parameters to the kernel line in the grub.conf of the guest.
console=tty0 console=xvc0

kernel line in my grub.conf is as below.

kernel /vmlinuz-2.6.18-53.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb 
quiet console=tty0 console=xvc0
To get a log in prompt on the console, please add the below line to your 
/etc/inittab, before ttyx defenitions. Once you do "xm console <guest>", 
you may have to press "return" to get the console.
co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav

--Sadique
> [root@xenserver04 ~]# cat /etc/xen/xen04_rh5_01
> # Automatically generated xen config file
> name = "xen04_rh5_01"
> memory = "1000"
> disk = [ 'phy:/dev/VolGroup00/xen04_vm02,xvda,w', ]
> vif = [ 'mac=00:16:3e:2a:b6:5f, bridge=xenbr0', ]
> vfb = ["type=vnc,vncunused=1"]
> uuid = "f6e74bad-7cbb-2af2-8e63-8f3e6b1628fb"
> bootloader="/usr/bin/pygrub"
> vcpus=1
> on_reboot   = 'restart'
> on_crash    = 'restart'
> serial = "pty" # enable serial console
> extra = 'xencons=tty'
>
>
> Thanks
>   

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