在RHEL上安装Xen DomU

samsungsamsung

• Most of our machines have used the Centos4 image from Jailtime.org.
  
• Editing a File system image using loopback device:
  [iyunv@arch1 xen]# mount -o loop /opt/xen/centos.4-3.img /mnt/xenfs
  [iyunv@arch1 xen]# mount
  /dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
  none on /proc type proc (rw)
  none on /sys type sysfs (rw)
  none on /dev/pts type devpts (rw,gid=5,mode=620)
  /dev/cciss/c0d0p1 on /boot type ext3 (rw)
  none on /dev/shm type tmpfs (rw)
  none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
  sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
  /opt/xen/centos.4-3.img on /mnt/xenfs type ext3 (rw,loop=/dev/loop4)
                          
  　　
  
  
  
  • I recommend to chroot before editing, to make sure you don't accidently edit the host server configs.
    [iyunv@arch1 lib]# cd /mnt/xenfs
    [iyunv@arch1 xenfs]# chroot .
    bash-3.00# ls
    bin  boot  dev  etc  halt  home  initrd  lib  lost+found  media  mnt  opt  proc  root  sbin  selinux  srv  sys  tmp  usr  var
    bash-3.00#
                                    
    　　
    
    
  
  
  
• At minimum you want to edit the /etc/sysconfig/network
  NETWORKING=yes
  HOSTNAME=arch2
  GATEWAY=10.100.105.1
                          
  　　
  
  
  
  • - and /etc/sysconfig/network-scripts/ifcfg-eth0
    TYPE=Ethernet
    DEVICE=eth0
    BOOTPROTO=static
    ONBOOT=yes
    IPADDR=10.100.105.41
    NETMASK=255.255.255.0
    NETWORK=10.100.105.0
    BROADCAST=10.100.105.255
    
    
    
    • – and edit/create /etc/resolv.conf
      domain j2noc.com
      nameserver 10.2.2.111
      nameserver 10.254.254.249
      
    
    
    
  
  
  

　　

• Xen config files
  
  
  
  • Put them in /etc/xen
    
  • Sample file, hopefully this is self explanatory. See Xen site for details.
    kernel = "/boot/vmlinuz-2.6.16.33-xen"
    memory = 128
    name = "centos2.4-3"
    vif = [ '' ]
    ip = "10.100.105.42"
    disk = ['file:/opt/xen/centos/centos2.4-3.img,sda1,w', 'file:/opt/xen/centos/centos2.swap,sda2,w']
    root = "/dev/sda1 ro"
                                    
    　　
    
    
  
  
  

Copying module files to the guest
　　If the host OS has devices installed that are not part of the guest, you can surface support for those by copying the /lib/modules for the xen kernel into the guest fs.

• Assumes that you created map files using depmod previously.
  
• mount -o loop the guest filesystem.
  
• cp -a /lib/modules/2.6.16.33-xen /mnt/xenfs/lib/modules
  

Starting the Guest

• Use xm create
  [iyunv@arch1 xen]# xm list
  Name                                      ID   Mem VCPUs      State   Time(s)
  Domain-0                                   0    65     2     r-----   7475.6
  centos.4-3                                 1   128     1     -b----   4230.5
  centos2.4-3                                2   128     1     -b----    314.8
  centos5.4-3                                9   512     1     -b----   5418.3
  [iyunv@arch1 xen]# xm create centos3.4-3.xen.cfg
  Using config file "./centos3.4-3.xen.cfg".
  Started domain centos3.4-3
  [iyunv@arch1 xen]# xm list
  Name                                      ID   Mem VCPUs      State   Time(s)
  Domain-0                                   0    65     2     r-----   7478.1
  centos.4-3                                 1   128     1     -b----   4230.5
  centos2.4-3                                2   128     1     -b----    314.8
  centos3.4-3                               13   256     1     -b----      1.0
  centos5.4-3                                9   512     1     -b----   5418.4
  [iyunv@arch1 xen]#
  

• Console into the running guest
  xm console centos2.4-3
  
  
  
  • If you're fast you may catch boot. If you're slow and get a blank screen, hit Return.
    
    
    
    • Exiting back to the Host is a bit like screen
      
    • Use Ctrl-]
      
    
    
    
  
  
  
• If you want to be guaranteed to watch the boot process, you can start the guest in console mode
  xm console centos2.4-3 -c
  

Expanding the size of a filesystem

• Bring down the guest instance if it's up!!!
  
  
  
  • Given you want to expand a virtual disk called filesystem.image by 1024MB (1G), do the following:
    
  
  
  
• dd if=/dev/zero bs=1M count=1024 >> filesystem.image
  
• e2fsck -f filesystem.image
  
• resize2fs filesystem.image
  
• e2fsck -f filesystem.image
  

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