Voici les etapes a suivre pour configurer une machine HOST avec 2 VMs GUEST en utilisant ubuntu 11.10 et kvm en mode route.

Modifiez votre /etc/network/interfaces

Configurez l’ip physique de la machine et creez des bridge.  Le plus important est la derniere ligne, vous devez activez le proxy_arp sur votre interface physique. Cela permet a la machine HOST de repondre au ARP request venant du reseau pour les VMs (donc seulement la mac physique est annoncee et ce pour l’IP HOST et les IPs des VMs).

# The loopback network interface
auto lo
iface lo inet loopback
 
# The primary network interface
auto eth0
iface eth0 inet static
        address IP_HOST_FIXME
        netmask 255.255.255.0
        network NETWORK_FIXME
        broadcast BROADCAST_FIXME
        gateway GATEWAY_FIXME
        # create dummy interfaces
        up /sbin/ifconfig dummy0 up
        up /sbin/ifconfig dummy1 up
        # create the bridges
        up /sbin/brctl addbr bridge0
        up /sbin/brctl addbr bridge1
        # add the interfaces to the bridges
        up /sbin/brctl addif bridge0 dummy0
        up /sbin/brctl addif bridge1 dummy1
        # bringup the bridges
        up /sbin/ifconfig bridge0 up
        up /sbin/ifconfig bridge1 up
        # add the routes
        up /sbin/route add IP_VM_1_FIXME dev bridge0
        up /sbin/route add IP_VM_2_FIXME dev bridge1
        # the most important!
        up /sbin/sysctl -w net.ipv4.conf.eth0.proxy_arp=1
 

Download this code: interfaces.txt

Je pense qu’il doit etre possible de n’utiliser qu’un bridge, mais je n’ai pas tente.

Activez IP forwarding

Editez /etc/sysctl.conf et modifiez la ligne

# Uncomment the next line to enable packet forwarding for IPv4
net.ipv4.ip_forward=1

Creez la configuration virsh pour vos VM

Creez un fichier xml comme le suivant:

<domain type='kvm'>
  <name>ubuntu</name>
  <memory>8388608</memory>
  <currentMemory>8388608</currentMemory>
  <vcpu>4</vcpu>
  <os>
    <type arch='x86_64' machine='pc-0.14'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/srv/ubuntu.qcow2'/>
      <target dev='hda' bus='ide'/>
      <address type='drive' controller='0' bus='0' unit='0'/>
    </disk>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <interface type='bridge'>
      <mac address='FIXME_MAC_GENERATED'/>
      <source bridge='bridge0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </memballoon>
  </devices>
</domain>
 

Download this code: ubuntu.xml

 Importez la configuration de votre VM

# virsh define foo.xml
# virsh start ubuntu

  Modifiez le /etc/network/interfaces de vos VMs

auto lo
iface lo inet loopback
 
auto eth0
iface eth0 inet static
        address IP_VM1_FIXME
        netmask 255.255.255.255
        up /sbin/route add IP_HOST_FIXME dev eth0
        up /sbin/route add default gw IP_HOST_FIXME
 

Download this code: interfaces-vm.txt

Voila les grandes lignes, en esperant que cela aide quelques personnes.

So here it is:

#!/usr/bin/perl
use strict;
use Time::ParseDate;
use Time::Local;
 
sub convert_week_to_date
{
    my ($year, $week) = @_;
 
    my $ref = timelocal(0, 0, 0, 1, 0, $year);
    my ($s, $m, $h, $dom, $m, $y, $wd, $yd, $i) =
        localtime($ref);
 
    my $time = parsedate("+".$week." weeks",
                         NOW => $ref);
 
    my ($s, $m, $h, $dom, $m, $y, $wd, $yd, $i) =
        localtime($time);
    $wd -= 1;
    my $time = parsedate("-".$wd." days",
                         NOW => $time);
    my ($s, $m, $h, $dom, $m, $y, $wd, $yd, $i) =
        localtime($time);
    return (sprintf("%04d/%02d/%02d",
            $y + 1900, $m + 1, $dom - $wd + 1));
}
 
print convert_week_to_date(2009, 1)."\\n";
print convert_week_to_date(2009, 52)."\\n";
print convert_week_to_date(2010, 1)."\\n";
print convert_week_to_date(2010, 22)."\\n";
print convert_week_to_date(2010, 23)."\\n";
print convert_week_to_date(2010, 24)."\\n";
 

Download this code: convert_week_to_date.pl

Hopefully it will help someone one day.

He is writing about a lot of interesting topics related to software engineering.

My favorite column from his blog:

• http://www.ericsink.com/bos/Closing_the_Gap_Part_1.html
• http://www.ericsink.com/bos/Closing_the_Gap_Part_2.html

Even on happycoders.org, we saw a difference in the daily average of spam received:

• before: Received 149MB 26945 3841
• after:Received 109MB 10351 1563

More details:

• http://hostexploit.com/downloads/Hostexploit%20Cyber%20Crime%20USA%20v%202.0%201108.pdf

Georgia Under Online Assault | Danger Room from Wired.com

• S.F. officials locked out of computer network
• http://blog.wired.com/27bstroke6/2008/07/sf-city-charged.html

And if you have really too much time, and you don’t know what to do, check this document:

http://www.coding-guidelines.com/cbook/sent792.pdf

Here is the reason why I tried to demo a website from powerpoint… I needed to demonstrate how to use a new Unix application, but I wanted to do that from my powerpoint presentation. After some time spent on google, I didn’t find any way to integrate a ‘unix terminal’ component in a power point slide.

So my solution was to use the embedded browser and use Ajaxterm to connect to a remote linux host… This works… but there is a limitation as it’s not possible to use PageUp, PageDown to go up and down in your terminal… In order to fix that, you can start ‘screen’ on your unix host, and then you can navigate in your terminal using Ctrl+b, Ctrl+f.

I believe that there is a cleaner to connect to a unix host from powerpoint… but I didn’t find it. If you know other solution… please share

Some links to finish, I didn’t try anyterm but it looks cool too…

• Ajaxterm
• Anyterm
• Gnu-Screen

Problem: You are giving a powerpoint presentation, and during this presentation you need to show/browse a website. The solution that most of the persons will chose will be to hit “alt+tab” to switch the focus to their browser… Yes that does the trick… But you may want to show the website from your powerpoint to keep your audience captivated. I personally think that people has a tendency to get distracted when you switch away from your fullscreen powerpoint.


My solution is to integrate a “Microsoft Web browser” component on your slide, so you can use it to browse a website. Start by adding the component as shown in this screen shot.





Then you can put several buttons on your slide to control your embedded browser. It should look like on this screenshot.


Finally you will have to add some Visual Basic code to your button’s callbacks. Something like:

Private Sub FontDecrease_Click()
    Dim Z As Variant
    WebBrowser1.ExecWB OLECMDID_ZOOM, OLECMDEXECOPT_DONTPROMPTUSER, Null, Z
 
    If Z > 0 Then
        Z = Z - 1
    Else
        Z = 0
    End If
    WebBrowser1.ExecWB OLECMDID_ZOOM, OLECMDEXECOPT_DONTPROMPTUSER, Z, Null
End Sub
 
Private Sub FontIncrease_Click()
    Dim Z As Variant
    WebBrowser1.ExecWB OLECMDID_ZOOM, OLECMDEXECOPT_DONTPROMPTUSER, Null, Z
 
    If Z < 4 Then
        Z = Z + 1
    Else
        Z = 4
    End If
    WebBrowser1.ExecWB OLECMDID_ZOOM, OLECMDEXECOPT_DONTPROMPTUSER, Z, Null
End Sub
 
Private Sub StartDemo_Click()
    WebBrowser1.Navigate ("http://samuel.happycoders.org/")
End Sub
 

Download this code: test-www-ppt.pas

And here is the result:


Download the example

In the next post I will explain why I wanted to do that… I have a really geeky reason