Converting HVM domU into paravirtualised one
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| - | Main source of the conversion information came from | + | Main source of the conversion information came from [http://pastebin.com/f6a5022bf pastebin]. |
First thing I used RHEL 4 installation DVD to get HVM domU installed. Here is the domU's configuration file I used: | First thing I used RHEL 4 installation DVD to get HVM domU installed. Here is the domU's configuration file I used: | ||
| Line 41: | Line 41: | ||
4) added xvc0 to the end of /etc/securetty | 4) added xvc0 to the end of /etc/securetty | ||
| - | 5) added the following line to /etc/inittab: | + | 5) added the following line to /etc/inittab (make sure you don't have it there already! Otherwise you are going to have some gremlins switching you consoles all the time): |
| - | + | co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav | |
6) shutdown the HVM domU and created new domU configuration file to run it as PV: | 6) shutdown the HVM domU and created new domU configuration file to run it as PV: | ||
Current revision as of 11:57, 3 November 2009
Main source of the conversion information came from pastebin.
First thing I used RHEL 4 installation DVD to get HVM domU installed. Here is the domU's configuration file I used:
name = "rhel4_pxe" kernel = "/boot/vmlinuz-xen-install" ramdisk = "/boot/initrd-xen-install" builder="hvm" device_model="/usr/lib64/xen/bin/qemu-dm" kernel="/usr/lib/xen/boot/hvmloader" memory = 512 disk = [ 'phy:/dev/rootvg_dom0/rhel4_domU_pxe,hda,w', 'file:/tmp/RHEL4-U8-re20090504.0-i386-ES-DVD-ftp.iso,hdc:cdrom,r', ] boot = "cd" vif = [ 'bridge=br120' ] vcpus = 1 localtime = 0 on_poweroff = 'destroy' on_reboot = 'restart' on_crash = 'destroy' vnc = "1" vnclisten = "172.xx.xx.181"
After the installation was over, I needed to convert the HVM image into a PV one. Since I had the boot order as 'hard disk; CD' (boot = "cd"), I had to change nothing in the above mentioned domU configuration file.
So, I booted the HVM domU and did the following:
1) installed kernel-xenU-2.6.9-89.EL package
2) made copy and re-built initrd image
# ls /boot/initrd-2.6.9-89.EL* # cd /boot # mv initrd-2.6.9-89.ELxenU.img initrd-2.6.9-89.ELxenU.img.bak # mkinitrd -v --builtin=xen_vbd --preload=xenblk initrd-2.6.9-89.ELxenU.img 2.6.9-89.ELxenU
3) changed /etc/modprobe.conf. Commented the line that was there (8139cp) and added two more for Xen block device driver and Xen network device driver:
#alias eth0 8139cp alias eth0 xennet alias scsi_hostadapter xenblk
4) added xvc0 to the end of /etc/securetty
5) added the following line to /etc/inittab (make sure you don't have it there already! Otherwise you are going to have some gremlins switching you consoles all the time):
co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav
6) shutdown the HVM domU and created new domU configuration file to run it as PV:
name = "rhel4_pvm" memory = 512 disk = [ 'phy:/dev/rootvg_dom0/rhel4_domU_pvm,xvda,w' ] vif = [ 'bridge=br120' ] vcpus = 1 builder = 'linux' bootloader = '/usr/bin/pygrub' localtime = 0 on_poweroff = 'destroy' on_reboot = 'restart' on_crash = 'destroy'
That was it. Pretty simple when you know how :-)
