2009-03-19

• 10:30-11:30 主任至中群業務訪談

Xen VNC

• 基本步驟請參考使用 DRBL 部署 Xen 虛擬叢集
• [備忘] 從 xm console 跳離的快速鍵為 CTRL + ]
• [狀況] 發現一個小小的問題，xen-tools 其實是採用 dom0 的 kernel 跟 initrd.img，所以 debootstrap 也是拷貝 dom0 的 /lib/modules/。加上如果我們要求 xen-tools 把 domU 的 image 檔案系統改為 reiserfs，而 dom0 自己是使用 ext3，會因為 dom0 initrd.img 沒有加入 reiserfs 的支援而致使 domU 開機時無法掛載 root filesystem。
• 在 Lenny x86_64 上的安裝步驟

  lenny:~# echo "loop max_loop=255" >> /etc/modules
  lenny:~# apt-get install xen-hypervisor-3.2-1-amd64 linux-image-2.6.26-1-xen-amd64 xen-tools libc6-xen bridge-utils lsb-release
  lenny:~# update-grub
  lenny:~# reboot
  --------- Boot with "Xen 3.2-1-amd64 / Debian GNU/Linux, kernel 2.6.26-1-xen-amd64" ---------
  lenny:~# lsb_release -a
  No LSB modules are available.
  Distributor ID: Debian
  Description:    Debian GNU/Linux 5.0 (lenny)
  Release:        5.0
  Codename:       lenny
  lenny:~# uname -a
  Linux lenny 2.6.26-1-xen-amd64 #1 SMP Sat Jan 10 20:39:26 UTC 2009 x86_64 GNU/Linux
  --------- "Install DRBL, configure DRBL services and client settings" ---------
  lenny:~# wget http://drbl.nchc.org.tw/GPG-KEY-DRBL
  lenny:~# apt-key add GPG-KEY-DRBL
  lenny:~# echo "deb http://free.nchc.org.tw/drbl-core drbl stable" > /etc/apt/sources.list.d/drbl-sources.list
  lenny:~# apt-get update
  lenny:~# apt-get install drbl
  lenny:~# /opt/drbl/sbin/drblsrv -i
  
  (... skip ...)
  
  *****************************************************.
  Trying to upgrade some necessary packages if available...
  *****************************************************.
  In ayo repository, searching the latest  kernel ...
  The latest kernel in the ayo repository is linux-image-2.6.26-1-openvz-amd64
  There are 2 kernels available for clients, which one do you prefer ?
  [1]: kernel 2.6.26-1-xen-amd64 x86_64 (from this DRBL server)
  [2]: linux-image-2.6.26-1-openvz-amd64 (from apt repository)
  [1]
  
  (... skip ...)
  
  lenny:~# /opt/drbl/sbin/drblpush -i
  
  --------- "Configure Xend" --------- 
  lenny:~# vi /etc/xen/xend-config.sxp
  lenny:~# /etc/init.d/xend restart
  --------- "Create Xen Image" --------- 
  lenny:~# xen-create-image -dir /home/xen --dist lenny --kernel /boot/vmlinuz-2.6.26-1-xen-amd64 --initrd /boot/initrd.img-2.6.26-1-xen-amd64 --hostname lenny1 --dhcp --mirror http://free.nchc.org.tw/debian
  --------- "Enable Xen Image VNC ports" --------- 
  lenny:~# echo "vfb = [ 'type=vnc,vnclisten=0.0.0.0,vncdisplay=1' ]" >> /etc/xen/lenny1.cfg
  lenny:~# xm create lenny1.cfg
  lenny:~# xm list
  Name                                        ID   Mem VCPUs      State   Time(s)
  Domain-0                                     0   357     1     r-----    106.4
  lenny1                                       3   128     1     -b----      8.7
  lenny:~# netstat -nap
  Active Internet connections (servers and established)
  Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
  tcp        0      0 0.0.0.0:5901            0.0.0.0:*               LISTEN      2682/qemu-dm
  

  xend-config.sxp

  @@ -136 +136 @@
   # two fake interfaces per guest domain.  To do things like this, write
   # yourself a wrapper script, and call network-bridge from it, as appropriate.
   #
  -(network-script network-dummy)
  +#(network-script network-dummy)
   
   # The script used to control virtual interfaces.  This can be overridden on a
   # per-vif basis when creating a domain or a configuring a new vif.  The
  @@ -151 +151 @@
   # If you are using only one bridge, the vif-bridge script will discover that,
   # so there is no need to specify it explicitly.
   #
  -(vif-script vif-bridge)
  +#(vif-script vif-bridge)
   
   
   ## Use the following if network traffic is routed, as an alternative to the
  @@ -162 +162 @@
   
   ## Use the following if network traffic is routed with NAT, as an alternative
   # to the settings for bridged networking given above.
  -#(network-script network-nat)
  -#(vif-script     vif-nat)
  +(network-script network-nat)
  +(vif-script     vif-nat)
   
   
   # Dom0 will balloon out when needed to free memory for domU.
  @@ -184 +184 @@
   # The interface for VNC servers to listen on. Defaults
   # to 127.0.0.1  To restore old 'listen everywhere' behaviour
   # set this to 0.0.0.0
  -#(vnc-listen '127.0.0.1')
  +(vnc-listen '0.0.0.0')
   
   # The default password for VNC console on HVM domain.
   # Empty string is no authentication.