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Xen

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Revision as of 12:27, 23 October 2012 by Cyril (Talk | contribs)
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Contents

Installation

Initialization

Context:

  1. Create a SSD partition, number 3, formatted with a 6 GB Ext4 file system.
  2. Attach an existing HDD partition named /vm to store the virtual machines.

Partitioning 

  1. fdisk /dev/sda
n 3 [enter] +6G

Formatting 

  1. mkfs.ext4 -E discard -L DEBIAN /dev/sda3
  2. mount /dev/disk/by-label/DEBIAN /mnt

ArchLinux as a source 

  1. pacman -S abs
  2. pacman -S base-devel
  3. abs
  4. mkdir /tmp/debootstrap
  5. cd /tmp/debootstrap
  6. wget https://aur.archlinux.org/packages/de/debootstrap/PKGBUILD
  7. makepkg -s
  8. pacman -U debootstrap*

Debian as a host 

  1. debootstrap --arch=amd64 wheezy /mnt http://ftp.fr.debian.org/debian
  2. LANG=C chroot /mnt /bin/bash
  3. export TERM=xterm-color
  4. cd /dev
  5. MAKEDEV generic
  6. cd /
  7. mkdir /vm

Configuration

Filesystems 

  1. nano /etc/fstab
# /etc/fstab
#
# <file system>           <dir>    <type> <options>                           <dump> <pass>

/dev/disk/by-label/DEBIAN /        ext4   discard,noatime,nodiratime,defaults 0      1

proc                      /proc    proc   defaults                            0      0
devpts                    /dev/pts devpts defaults                            0      0
shm                       /dev/shm tmpfs  nodev,nosuid                        0      0
tmpfs                     /tmp     tmpfs  size=2048M                          0      0
tmpfs                     /var/log tmpfs  size=64M                            0      0

/dev/disk/by-label/VM     /vm      ext4   defaults                            0      0

Network 

  1. nano /etc/network/interfaces
auto lo eth0 xenbr0
iface lo inet loopback
iface eth0 inet static
    address 192.168.1.101
    network 192.168.1.0
    netmask 255.255.255.0
    gateway 192.168.1.1
iface xenbr0 inet static
    bridge_ports none
    address 192.168.1.199
    broadcast 192.168.1.255
    netmask 255.255.255.0
    gateway 192.168.1.1

  1. nano /etc/resolv.conf
nameserver 192.168.1.1

  1. echo XEN > /etc/hostname
  2. nano /etc/hosts
127.0.0.1	localhost
127.0.0.1	XEN

Kernel 

  1. nano /etc/modprobe.d/blacklist.conf
blacklist pcspkr
blacklist acpi_cpufreq
blacklist bluetooth

Packages 

  1. nano /etc/apt/sources.list
deb http://ftp.fr.debian.org/debian wheezy main non-free

  1. aptitude update

Localization 

  1. aptitude install locales
  2. dpkg-reconfigure locales
  3. aptitude install console-data
  4. dpkg-reconfigure console-data

Defaults

Locale 

  1. nano /etc/default/locale
LANG=en_US.UTF-8

Keyboard 

  1. nano /etc/default/keyboard
XKBMODEL="pc105"
XKBLAYOUT="fr"

tmp filesystem 

  1. nano /etc/default/tmpfs
RAMTMP=yes

HDD temperature 

  1. nano /etc/default/tmpfs
RUN_DAEMON="true"
DISKS="/dev/sdb"

rcS 

  1. nano /etc/default/rcS
TMPTIME=-1

XEN

Deployment 

  1. aptitude install xen-linux-system-amd64
  2. aptitude install xen-hypervisor-4.1-amd64
  3. aptitude install xen-tools

Boot Manager

Files 

  1. exit
  2. ln -s /usr/lib/syslinux/mboot.c32 /boot/syslinux/mboot.c32
  3. mkdir /boot/Debian
  4. cp /mnt/boot/xen-4.1-amd64.gz /boot/Debian/
  5. cp /mnt/boot/vmlinuz-3.2.0-3-amd64 /boot/Debian/
  6. cp /mnt/boot/initrd.img-3.2.0-3-amd64 /boot/Debian/
  7. ln -s /boot/Debian/xen-4.1-amd64.gz /boot/Debian/xen.gz
  8. ln -s /boot/Debian/vmlinuz-3.2.0-3-amd64 /boot/Debian/vmlinuz
  9. ln -s /boot/Debian/vmlinuz-3.2.0-3-amd64 /boot/Debian/initrd.img

SysLinux 

  1. nano /boot/syslinux/syslinux.cfg
LABEL debian
	MENU LABEL De^bian Linux
	LINUX ../Debian/vmlinuz
	APPEND root=/dev/sda3 ro quiet elevator=noop nmi_watchdog=0 vga=0
	INITRD ../Debian/initrd.img

LABEL xen
	MENU LABEL Debian ^Xen
	KERNEL mboot.c32
	APPEND ../Debian/xen.gz --- ../Debian/vmlinuz root=/dev/sda3 ro quiet elevator=noop --- ../Debian/initrd.img

  1. shutdown -r now

Testing 

  1. xentop
xentop - 14:55:16   Xen 4.1.3
1 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 6282360k total, 5093488k used, 1188872k free    CPUs: 8 @ 3210MHz
      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR  VBD_RSECT  VBD_WSECT SSID
  Domain-0 -----r        491    1.7    5020324   79.9   no limit       n/a     8    0        0        0    0        0        0        0          0          0 0



  Delay  Networks  vBds  Tmem  VCPUs  Repeat header  Sort order  Quit

Virtual Machine Manager

Xorg 

  1. wget http://us.download.nvidia.com/XFree86/Linux-x86_64/304.60/NVIDIA-Linux-x86_64-304.60.run
  2. chmod +x NVIDIA-Linux-x86_64-304.60.run
  3. ./NVIDIA-Linux-x86_64-304.60.run
  4. nvidia-xconfig
Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Dell"
    ModelName      "U2711"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

  1. aptitude install xfce4
  2. aptitude install chromium
  3. aptitude install lightdm lightdm-gtk-greeter
  4. echo "/usr/sbin/lightdm" > /etc/X11/default-display-manager
  5. nano /etc/X11/Xsession
ERRFILE=$HOME/tmp/.xsession-errors

First VM

  • Prepare the VM directory 
  1. ifup xenbr0
  2. brctl show
  3. cd /vm
  4. mkdir XEN
  5. chgrp users XEN
  6. chmod g+w XEN
  7. cd
  8. nano /etc/xen-tools/xen-tools.conf
dir = /vm/XEN
Create a Debian VM 
  1. xen-create-image --hostname VPC1 --ip 192.168.1.201 --vcpus 2 --dist wheezy
...
General Information
--------------------
Hostname       :  VPC1
Distribution   :  wheezy
Mirror         :  http://ftp.fr.debian.org/debian
Partitions     :  swap            128Mb (swap)
                  /               4Gb   (ext3)
Image type     :  sparse
Memory size    :  128Mb
Kernel path    :  /boot/vmlinuz-3.2.0-3-amd64
Initrd path    :  /boot/initrd.img-3.2.0-3-amd64
...
Logfile produced at:
	 /var/log/xen-tools/VPC1.log

Installation Summary
---------------------
Hostname        :  VPC1
Distribution    :  wheezy
IP-Address(es)  :  192.168.1.201 
RSA Fingerprint :  07:04:0e:08:0c:01:08:0b:0c:03:09:07:00:08:01:02
Root Password   :  xXxXxXxX
  • Define Video & Audio features 
  1. nano /etc/xen/VPC1.cfg
#
#  Graphics and Audio
#
stdvga      = '1'
videoram    = '16'
Start the new VM 
  1. xm create /etc/xen/VPC1.cfg
Using config file "/etc/xen/VPC1.cfg".
Started domain VPC1 (id=3)
List any running VM 
  1. xm list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4902     8     r-----    101.5
VPC1                                         3   128     2     -b----      2.4
Take control of the VM
  • Using the console (press CTRL+] to exit) 
  1. xm console 3
  • Using ssh to remotely connect 
  1. ssh root@VPC1
Windowing
  • Inside the VM, configure an Internet box 
  1. aptitude install xorg
  2. dpkg-reconfigure x11-common
  3. aptitude install dbus
  4. aptitude install twm
  5. echo RandomPlacement >>  /etc/X11/twm/system.twmrc
  6. echo 'NoTitle { chromium }' >>  /etc/X11/twm/system.twmrc
  7. aptitude install chromium
  8. adduser --gid 100 cyring
  9. exit
  • Reconnect as a regular user 
  1. ssh cyring:VPC1
  2. echo "chromium &" > .xinitrc
  3. echo "exec twm" >> .xinitrc
  4. startx
Stop the VM
  • Nicely shut down the VM 
  1. xm shutdown 3
  • Remove the VM from the managed environment. 
  1. xm delete VPC1
Lost password !
  • Mount the VM filesystem 
  1. mount /vm/XEN/domains/VPC1/disk.img /mnt
  2. chroot /mnt
  • Inside the VM 
  1. passwd
  2. exit
  • Back to back 
  1. umount /vm/XEN/domains/VPC1/disk.img

GUI 

  1. aptitude install virt-manager
  2. # usermod -a -G libvirt LOGIN
  3. nano /etc/xen/xend-config.sxp
(xend-unix-server yes)

  1. service xen restart
  2. python /usr/share/virt-manager/virt-manager.py
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