Vnx-rootfsubuntu

Follow this procedure to create a Ubuntu based root-file-system for VNX. The procedure has been tested with Ubuntu 9.10 and 10.04.  Create the filesystem disk image: qemu-img create -f qcow2 root_fs_ubuntu-base.qcow2 5GB Get Ubuntu installation CD. For example: wget ftp://ftp.rediris.es/mirror/ubuntu-releases/10.04.1/ubuntu-10.04.1-server-i386.iso cp ubuntu-10.04.1-server-i386.iso /almacen/iso Create a libvirt XML definition (root_fs_ubuntu.xml) containing the virtual machine description:  Ubuntu 524288  1    hvm    /usr/bin/kvm     <disk type='file' device='cdrom'> <source file='/almacen/iso/ubuntu-10.04.1-server-i386.iso'/> <target dev='hdb'/> <interface type='network'> <source network='default'/> <graphics type='vnc'/> Note: change "source file=" lines to whatever fits your case (use full paths).

Start the virtual machine with:</li> virsh create root_fs_ubuntu.xml Access virtual machine console with:</li> virt-viewer Ubuntu Note: alternative you can start the machine and open the console at the same time with the command: /usr/share/vnx/bin/vnx_modify_rootfs root_fs_ubuntu.xml Follow Ubuntu installation menus to install a basic system with ssh server. Once the installation is finished, stop the machine and edit root_fs_ubuntu.xml file and comment the following line in cdrom disk specification:</li> Start the virtual machine again and finish the installation:</li> <ul> Access the console and sudo root: </li> sudo su Update the system</li> apt-get update apt-get dist-upgrade Install XML::DOM perl package:</li> apt-get install libxml-dom-perl Only for Ubuntu 10.04:</li> <ul> create /media/cdrom* directories:</li> mkdir /media/cdrom0 mkdir /media/cdrom1 ln -s /media/cdrom0 /media/cdrom ln -s /cdrom /media/cdrom add the following lines to /etc/fstab:</li> /dev/scd0 /media/cdrom0    udf,iso9660  user,noauto,exec,utf8  0  0 /dev/scd1 /media/cdrom1    udf,iso9660  user,noauto,exec,utf8  0  0 </ul> Configure a serial console on ttyS0:</li> cd /etc/init cp tty1.conf ttyS0.conf sed -i -e 's/tty1/ttyS0/' ttyS0.conf Activate startup traces on serial console by editting /boot/grub/grub.cfg file and adding "console=ttyS0" to the linux line. For example:</li> linux  /boot/vmlinuz-2.6.35-25-generic-pae root=UUID=eb1a0afb-48b2-4e42-ba6d-22bfae1055f3 ro   quiet console=ttyS0 li>Install VNX autoconfiguration daemon:</li> <ul> From the host execute:</li> /usr/share/vnx/bin/vnx_update_aced Ubuntu /usr/share/vnx/aced/vnx-aced-lf-0.1b.tgz From the virtual machine console:</li> mount /media/cdrom /media/cdrom/install_vnxdaemon </ul> Delete udev rules files:</li> rm /etc/udev/rules.d/70-persistent-net.rules rm /etc/udev/rules.d/70-persistent-cd.rules Optional: install graphical user interface.</li> <ul> <li>Minimal:</li> sudo apt-get install xorg gnome-core gksu gdm gnome-system-tools gnome-nettool firefox-gnome-support <li>Complete:</li> sudo apt-get install ubuntu-desktop </ul> <li>Optional: install other services:</li> <ul> <li>Apache server:</li> sudo apt-get install apache2 update-rc.d -f apache2 remove  # to avoid automatic start <li>Other network tools</li> sudo apt-get traceroute </ul> <li>Stop the machine with:</li> halt </ul> </ul>

If everything went well, your root filesystem will be ready to be used with VNX. You can make a simple test using the simple_ubuntu.xml scenario distributed with VNX.

Installing additional software
To install additional software or modify your root file system, you just have to start it as described above and make the operations required on the filesystem. /usr/share/vnx/bin/vnx_modify_rootfs root_fs_ubuntu.xml apt-get install ... rm /etc/udev/rules.d/70-persistent-net.rules rm /etc/udev/rules.d/70-persistent-cd.rules halt
 * Start the virtual machine (directly using virsh or the vnx_modify_rootfs utility):
 * Install the software:
 * Delete udev rules files:
 * Stop the machine with:

Updating ACE daemon
If you have a root filesystem with the autoconfiguration and command execution daemon (ACE) already installed, you can use the autoupdate functionallity to update the daemon to a newer version. Just follow this procedure:

/usr/share/vnx/bin/vnx_modify_rootfs root_fs_ubuntu.xml /usr/share/vnx/bin/vnx_update_aced Ubuntu /usr/share/vnx/aced/vnx-aced-lf-0.1b.tgz
 * Edit the xml described above and comment the line defining the Ubuntu iso file for the cdrom:
 * Start the virtual machine (directly using virsh or the vnx_modify_rootfs utility):
 * Execute the update utility:
 * Once the ace daemon is updated the virtual machine will be rebooted automatically.

Known problems
<ul> <li>Each a cdrom is mounted (for example, ehenever a command is executed on the virtual machine) the following error appear in the console:</li> Jul 27 22:33:31 vnx kernel: [ 4384.875886] ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 Jul 27 22:33:31 vnx kernel: [ 4385.291374] ata1.01: BMDMA stat 0x5 Jul 27 22:33:31 vnx kernel: [ 4385.493411] sr 0:0:1:0: [sr0] CDB: Read(10): 28 00 00 00 00 18 00 00 01 00 Jul 27 22:33:31 vnx kernel: [ 4385.493460] ata1.01: cmd a0/01:00:00:00:08/00:00:00:00:00/b0 tag 0 dma 2048 in Jul 27 22:33:31 vnx kernel: [ 4385.493461]         res 01/60:00:00:00:08/00:00:00:00:00/b0 Emask 0x3 (HSM violation) Jul 27 22:33:31 vnx kernel: [ 4386.263553] ata1.01: status: { ERR } However, the command are executed correctly. This error does not appear on Ubuntu 9.10 filesystems.

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