problem in connection to console of VM via virsh

sanaz · 09-20-2012, 02:19 PM

Hi all,

I'm trying to connect to my VM's console but I after getting:

Code:

virsh # console kvm2
Connected to domain kvm2
Escape character is ^]

nothing is displayed and it's stuck.
and this is the kvm2 info:

Code:

<console type='pty' tty='/dev/pts/2'>
      <source path='/dev/pts/2'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>

Any help is appreciated

dyasny · 09-21-2012, 01:17 AM

did you add the console to the guest's grub?

sanaz · 09-21-2012, 08:54 AM

No. How can I do that?

Quote:

Originally Posted by dyasny

did you add the console to the guest's grub?

dyasny · 09-21-2012, 11:27 AM

add 'console=ttyS0' to the kernel line in grub.conf

the libvirt XML should contain this:

<serial type='pty'>
<target port='0'/>
</serial>

<console type='pty'>
<target type='serial' port='0'/>
</console>

sanaz · 09-21-2012, 12:52 PM

It looks like:

Code:

<serial type='pty'>
      <source path='/dev/pts/2'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/2'>
      <source path='/dev/pts/2'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>

which seems fine.

and also I don't have grub.conf, instead there is /etc/grub2.cfg, should I add them to it?

dyasny · 09-21-2012, 01:25 PM

console=ttyS0 should be in the kernel boot line. however your specific distro defines it

sanaz · 09-21-2012, 02:01 PM

should I add it to the Os I'm running hypervisor on it, or the virtual machines os?

Quote:

Originally Posted by dyasny

console=ttyS0 should be in the kernel boot line. however your specific distro defines it

dyasny · 09-22-2012, 02:55 AM

the guest os

docent.net · 09-22-2012, 08:38 AM

It really depend on distro. Normally on the guest You should:

Code:

echo ttyS0 >> /etc/securetty

And now You should add this to Your kernel boot params in grub.conf (location of this file depends on Your distro, try /boot/grub2/grub.cfg and If You don't find there then 'locate grub.conf'):

Code:

console=ttyS0

so Your kernel boot param looks like:

Code:

kernel /vmlinuz-2.6.32-220.23.1.el6.x86_64 ro root=/dev/mapper/vg_main-root rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_main/root rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb crashkernel=auto rd_LVM_LV=vg_main/swap  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM console=ttyS0

And finally enter this:

Code:

echo "S0:12345:respawn:/sbin/agetty ttyS0 115200" >> /etc/inittab && init q

Reboot Your guest and You should have working console

sanaz · 09-25-2012, 09:25 AM

But How can I do it on guest OS(VM), while I cannot connect to its console??

dyasny · 09-25-2012, 03:23 PM

use another type of console at first, or deploy the VM with this setting preconfigured via kickstart. Or use a graphical console

chrism01 · 10-01-2012, 06:06 PM

Actually, i just hit <Rtn/Enter> at that point to get the login prompt

Code:

 virsh console vm1
Connected to domain vm1
Escape character is ^]

< now hit Rtn/Enter key ... et voila the prompt :) >

CentOS release 6.3 (Final)
Kernel 2.6.32-279.el6.x86_64 on an x86_64

vm1 login: