xen installation on cent os 6.3 - installation

Question

I followed tutorial http://www.howtoforge.com/virtualization-with-xen-on-centos-6.2-x86_64-paravirtualization-and-hardware-virtualization
To install xen on Centos 6.3 everything is going perfect but, after editing /boot/grub/menu.lst
Quote:
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/mapper/vg_xen-LogVol01
# initrd /initrd-[generic-]version.img
#boot=/dev/sdb
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.32.57-2.el6xen.x86_64)
root (hd0,0)
kernel /xen.gz dom0_mem=1024M cpufreq=xen dom0_max_vcpus=1 dom0_vcpus_pin
kernel /vmlinuz-2.6.32.57-2.el6xen.x86_64 ro root=/dev/mapper/vg_xen-LogVol01 rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_xen/LogVol01 rd_LVM_LV=vg_xen/lv_swap rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=128M KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /initramfs-2.6.32.57-2.el6xen.x86_64.img
title CentOS (2.6.32-279.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-279.el6.x86_64 ro root=/dev/mapper/vg_xen-LogVol01 rd_NO_LUKS LANG=en_US.UTF-8 rd_LVM_LV=vg_xen/LogVol01 rd_LVM_LV=vg_xen/lv_swap rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=128M KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /initramfs-2.6.32-279.el6.x86_64.img
when i reboot it is booted with xen kernel but when i run command
xm info or xm list
showing error
" Error: Unable to connect to xend: No such file or diectory. Is xend running "
when i run command
xend start
showing error
" xc: error: Could not obtain handle on privileged command interface (2 = No such file or directory): Internal error
xend/image.py: Error connecting to hypervisor "
ls /proc/xen
" ls: cannot access /proc/xen: No such file or directory "
added entry in /etc/fstab
Quote:
none /proc/xen xenfs default 0 0
after reboot gives error no such file or directory,
lsmod | grep -i xen output: Nothing...
modprob xen-evtchn
FATAL: Error inserting xen_evtchn (/lib/modules/2.6.32.57-2.el6xen.x86_64/kernel/drivers/xen/xen-evtchn.ko): No such device
modprob xen-gntdev
FATAL: Error inserting xen_gntdev (/lib/modules/2.6.32.57-2.el6xen.x86_64/kernel/drivers/xen/xen-gntdev.ko): No such device
I have enabled hardware virtulization in bios still problem not solved.
I tried another tutorial https://www.crc.id.au/xen-on-rhel6-scientific-linux-6-centos-6-howto/
it seems like nothing is working for me...
Guys... please share your thoughts about this problem...
Thank you.

Answer 1

i ran into this too in booting a Xen dom0 kernel.
i might have spotted one small omission in your grub.conf compared to the instructions.
in the grub config section at this line: "replace the first word initrd with module."
for example, here's my working Xen Dom0 grub.conf.
good luck!
default=0
timeout=2
title CentOS 6.3 Xen dom0
root (hd0,0)
kernel /boot/xen.gz loglvl=all guest_loglvl=all
module /boot/vmlinuz-dom0-kernel ro root=/dev/sda1 nomodeset console=ttyS0,115200 iommu=off earlyprintk=xen initcall_debug debug loglevel=10
module /boot/initrd-dom0-kernel.img
title CentOS 6.3 (No Xen)
root (hd0,0)
kernel /boot/vmlinuz-dom0-kernel ro root=/dev/sda1
initrd /boot/initrd-dom0-kernel.img
title Stock CentOS 6.3
root (hd0,0)
kernel /boot/vmlinuz-centos6.3 ro root=/dev/sda1
initrd /boot/initrd-centos6.3.img

Answer 2

This does the trick!
Check your boot entries in grub. I just upgraded my Centos 6.3 with the kernel-xen-3.5.3-1 to 3.7.1-3 and the new boot entry for this kernel gets wrong because between updates I installed a standard kernel for testing other things.
Fixing the correct boot options for xen brings back my virtualization!
title CentOS (3.7.1-3.el6xen.x86_64)
root (hd0,0)
kernel /xen.gz dom0_mem=1024M cpufreq=xen dom0_max_vcpus=4 dom0_vcpus_pin
module /vmlinuz-3.7.1-3.el6xen.x86_64 ro root=UUID=<longUUID> KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 crashkernel=auto rhgb quiet
module /initramfs-3.7.1-3.el6xen.x86_64.img

Answer 3

I had the same issue:
Could not obtain handle on privileged command interface (2 = No such file or directory): Internal error
This was solved by adding the below line in /etc/fstab
none /proc/xen xenfs defaults 0 0
See this post in the Xen Project mailing list for more details.