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--- xen:creation_of_a_domu [2009/07/20 20:54]
Luc Nieland debian lenny addition
+++ xen:creation_of_a_domu [2011/02/07 19:05] (current)
Luc Nieland
@@ Line 1: / Line 1: @@
+======DomU creation======
+=====Debian 6 (Squeeze)=====
+====with KVM====
+A convenient way to prepair an image is by using KVM on your workstion. Install from the Net or the netinst.iso Keep in mind:
+  * install minimal, (use expertmode).
+  * it installs with grub2 only, so you will you will need xen-4 on your Dom0 to use pygrub.
+After the reboot test, before the shutdown and copy-over to the Xen dom0, a few modifications are needed:
+To have a console (with xm console on the Dom0), including a login prompt, you need to have a line in /etc/inittab with:
+:2345:respawn:/sbin/getty 38400 hvc0
+Adapt the filesystemlines in /etc/fstab from /dev/sda1 to /dev/vda1
+Now shutdown, and copy over the image file to the dom0 system. KVM usually leaves its image files in /var/lib/libvirt/images/*.img
+Use dd to place this disk-image file on a logicalvolume.
+An example minimal config with pygrub:
+<code>
+name       = "deb6"
+memory     =  1024
+vcpus      =  1
+bootloader = "/usr/lib/xen-4.0/bin/pygrub"
+disk       =  [ "phy:/dev/mapper/vg00-deb6disk0,xvda,w" ]
+vif        =  [ "mac=00:16:3c:53:ba:f9,bridge=xenbr0" ]
+extra      = "clocksource=jiffies"
+</code>
+====with debbootstrap====
+See below.
+====upgrade from a Debian 5 (Lenny) domU ====
+As preparation, adapt /etc/apt/sources and execute:
+  apt-get update
+Now comes the more tricky part, execute the steps below, and do not reboot in between:
+  touch /etc/udev/kernel-upgrade
+  apt-get dist-upgrade -fu
+Only when the Dom0 is xen-3 (i.e. pygrub is not grub-2 capable)
+  apt-get install grub-legacy
+Adapt /boot/grub/menu.lst and append console=hvc0 to the kernel line, like this:
+  kernel /vmlinuz-2.6....   root=/.....   ro  console=hvc0 xencons=tty
+When the Dom0 is xen-4 or later (i.e. pygrub is grub-2 capable)
+  upgrade-from-grub-legacy
+  rm -f /boot/grub/menu.lst*
+In /etc/inittab you need at least this line:
+:2345:respawn:/sbin/getty 38400 hvc0
+Done. Now you can safe reboot the domU system. You will have a working console.
+===clock===
+New clock behaviour in newer kernels. The  result is 'clock went backwards' problems.  Add the line below to the domU.conf start file:
+  extra="clocksource=jiffies"
+  * See: [[http://wiki.debian.org/Xen#A.27clocksource.2BAC8-0.3ATimewentbackwards.27]]
+=====Opensolaris PV domU=====
+In case your hardware does not match de Solaris-x86 hardware compatibility list, but you do want to run one or more Solaris machines, Xen is a solution. In this case, Linux is used for the dom0, so all drivers of Linux can be used to adress the hardware. The Xen hypervisor layer does the i/o translation :-)
+Nexenta is a recently developed distribution of OpenSolaris, which combines the kernel and some great features like ZFS with the usability developed by Debian. A good direction for Solaris in my opinion.
+The link below is describes the installation steps of the Solaris/Linux combination:
+See: http://wiki.tardis.ed.ac.uk/index.php/OpenSolaris_Xen_domU
+=====RedHat 6 PV domU =====
+RHEL6 runs as Xen PV (paravirtual) domU using the pvops framework in the default kernel.
+A convenient way to make the raw image for domU usage is with KVM. Install from the CDrom, the usual way.
+To use this image as a domU, edit the /etc/grub.conf in the image (by using KVM) and add to the kernel line:
+  console=hvc0
+After this, this machine will not have a console with KVM anymore when rebooted in KVM. So shut it down, and copy it over to the xen dom0 machine.
+A minimal domU.conf file example is:
+  name       =   "rh6beta"
+  memory     =    1024
+  vcpus      =    2
+  bootloader =   "/usr/lib/xen-4.0/bin/pygrub"
+  disk       = [ "phy:/dev/mapper/vg00-rh6disk0,xvda,w"  ]
+  vif        = [ "mac=00:16:34:f2:3b:7f,bridge=xenbr3"]
+  extra      =   "clocksource=jiffies"
+When the mac-adres of the domU has changed, update the configfiles:
+  * /etc/sysconfig/network-scripts/ifcfg-eth*    (HWADDR=... )
+  * /etc/udev/rules.d/70-persistent-net.rules
+=====Ubuntu-10.04 PV domU =====
+A convenent way to make the raw image is with KVM. Install from the Net or the CDrom, the usual way, but keep in mind:
+  * install 10.04 with commandline only, and use expertmode.
+  * best choose for grub1 and not grub2, so you will end up with a normal /boot/grub/menu.lst so pygrub will work without hacking it.
+After the reboot test, before the shutdown and copy-over to the Xen dom0, a few modifications are needed:
+Install a kernel with the pv_ops externtions:
+  apt-get install linux-image-virtual
+  * To have the xm-console, including a login prompt, do:
+<code>
+# most important:
+cp  /etc/init/tty0.conf  /etc/init/hvc0.conf
+sed -i 's|tty0|hvc0|g' /etc/init/hvc0.conf
+# to be complete:
+mv /etc/init/tty1.conf /etc/init/tty1.conf.disabled
+mv /etc/init/tty2.conf /etc/init/tty2.conf.disabled
+mv /etc/init/tty3.conf /etc/init/tty3.conf.disabled
+mv /etc/init/tty4.conf /etc/init/tty4.conf.disabled
+mv /etc/init/tty5.conf /etc/init/tty5.conf.disabled
+mv /etc/init/tty6.conf /etc/init/tty6.conf.disabled
+</code>
+  * Optionally disable ureadahead:
+<code>
+mv /etc/init/ureadahead.conf  /etc/init/ureadahead.conf.disable
+mv ureadahead-other.conf ureadahead-other.conf.disable
+</code>
+Now shutdown, and copy over the image file to the dom0 system. KVM usually leaves its image files in /var/lib/libvirt/images/*.img
+Use dd to place this disk-image file on a logicalvolume.
+  * Use this xm create config:
+<code>
+name = "ubu1004serv"
+memory = 1024
+vcpus = 1
+#kernel = "/var/xen/kernels/ubuntu/vmlinuz-2.6.32-24-server"
+#ramdisk = "/var/xen/kernels/ubuntu/initrd.img-2.6.32-24-server"
+#root = "/dev/mapper/vg01-root ro"
+#
+bootloader = "/usr/lib/xen-3.4/bin/pygrub"
+#extra = "console=hvc0 xencons=tty"
+#
+vfb = [  ]
+on_poweroff = "destroy"
+on_reboot = "restart"
+on_crash = "restart"
+#
+disk = [ "phy:/dev/mapper/vg00-ubu1004disk0,xvda,w"  ]
+vif = [ "mac=00:16:3c:53:ba:f9,bridge=xenbr0"]
+</code>
+See also:
+  * [[http://www.panticz.de/Ubuntu-Lucid-domU-under-Debian-Lenny-Dom0]]
+  * [[https://help.ubuntu.com/community/Xen]]
+=====Opensolaris PV domU=====
+In case your hardware does not match de Solaris-x86 hardware compatibility list, but you do want to run one or more Solaris machines, Xen is a solution. In this case, Linux is used for the dom0, so all drivers of Linux can be used to adress the hardware. The Xen hypervisor layer does the i/o translation :-)
+Nexenta is a recently developed distribution of OpenSolaris, which combines the kernel and some great features like ZFS with the usability developed by Debian. A good direction for Solaris in my opinion.
+The link below is describes the installation steps of the Solaris/Linux combination:
+See: http://wiki.tardis.ed.ac.uk/index.php/OpenSolaris_Xen_domU
+======Debbootstrap creation======
 =====Debian domU=====
@@ Line 126: / Line 345: @@
-===Automatic domU startup===
+======Automatic domU startup======
 Create a directory /etc/xen/auto and put the domU configuration file in this directory (or create a symbolic link).
@@ Line 132: / Line 355: @@
 In case you have a lot of domU's, a problem might arise that networking fails when using automatic startup.
-===extra software and config===
+======extra software and config======
 Configure locales to get rid of the message  Setting locale failed
   apt-get install locales
@@ Line 149: / Line 372: @@
-=====Opensolaris domU=====
-In case your hardware does not match de Solaris-x86 hardware compatibility list, but you do want to run one or more Solaris machines, Xen is a solution. In this case, Linux is used for the dom0, so all drivers of Linux can be used to adress the hardware. The Xen hypervisor layer does the i/o translation :-)
-Nexenta is a recently developed distribution of OpenSolaris, which combines the kernel and some great features like ZFS with the usability developed by Debian. A good direction for Solaris in my opinion.
-The link below is describes the installation steps of the Solaris/Linux combination:
-See: http://wiki.tardis.ed.ac.uk/index.php/OpenSolaris_Xen_domU

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