[Lxc-users] updated lxc template for debian squeeze - with attachedscript ; )

[John Soros]

Hi again,
I tried creating a bug for this issue so I don't spam the list with all
my changes, but the "Add new" page on sourceforge displays a blank page
for me.
An other minor update, this fixes the fact that the scripts didn't add
the locale to locale.gen, so the locale wasn't generated and thus was
unusable (aptitude among others complains a lot).
Signed-off-by: John Soros <johnny at r0x0r.me>

--
The POP server is out of Coke


On Tue, 1 Mar 2011 18:18:17 +0100
John Soros <johnny at r0x0r.me> wrote:

> Hi,
> i have tried to find an rfc about this but have failed, instead, the
> only (serious/credible) documentation i could find was
> http://wiki.xen.org/xenwiki/XenNetworking#head-d5446face7e308f577e5aee1c72cf9d156903722 ,
> so i updated the script accordingly, here is the updated patch.
> again,
> Signed-off-by: John Soros <johnny at r0x0r.me>
> 
> 
> --
> the router thinks its a printer.
> 
> 
> On Fri, 25 Feb 2011 09:03:55 +0100
> Jäkel, Guido <G.Jaekel at dnb.de> wrote:
> 
> > Dear John,
> > 
> > > - generate random mac address for the guest so it gets always the
> > > same lease from a dhcp server
> > 
> > You suggest doing this by
> > 
> > 	macaddr=$(echo -n 00; hexdump -n 5 -v -e '/1
> > ":%02X"' /dev/urandom)
> > 
> > 
> > 
> > I think this is a "little bit to random". The german Wikipedia tells
> > at  http://de.wikipedia.org/wiki/MAC-Adresse  about a reserved MAC
> > range for private use (sorry, it's not in corresponding the English
> > article):
> > 
> > 	["Neben der OUI existiert auch ein kleiner Adressbereich
> > (IAB
> > - Individual Address Block), der für Privatpersonen und kleine
> > Firmen und Organisationen vorgesehen ist, die nicht so viele
> > Adressen benötigen. Die Adresse beginnt mit 00-50-C2 und wird von
> > drei weiteren Hex-Ziffern gefolgt (12 Bits), die für jede
> > Organisation vergeben werden. Damit verbleibt der Adressbereich
> > innerhalb der Bits 11 bis 0 nutzbar wodurch 212 = 4096 individuelle
> > Adressen möglich sind."]
> > 
> > 
> > 
> > Maybe we should take respect to this and we should use
> > 
> > 	macaddr=$(echo -n "00:50:C2"; hexdump -n 3 -v -e '/1
> > ":%02X"' /dev/urandom)
> > 
> > for this. Another approach is to derive it from the designated name
> > of the container (i.e. $hostname in terms of the script). Because
> > there might be typical clustering naming schemes based on a name and
> > some digits, I suggest to select the first and the last two
> > characters of the hostname (filled by random for the unlikely case
> > of a hostname shorter than 3 chars)
> > 
> > 	echo -n "00:50:C2"; echo "${hostname:0:1}${hostname: -2}
> > $(head -c 3 /dev/urandom) " | hexdump -n 3 -v -e '/1 ":%02X"'
> > 
> > 	-> 00:50:C2:<first>:<nextlast>:<last>	filled by
> > random
> > 
> > 
> > 
> > @Daniel: Because this will have a common use for all, it might be
> > included into the lxc-conf parser
> > 
> > 	["lxc.network.hwaddr: the  interface mac address is
> > dynamically allocated by default to the virtual interface ...]"
> > 
> > 
> > We maybe should have a special keyword for a "derived" semi-static
> > MAC that would not change at every startup of the container but may
> > be calculated by the formula given above.
> > 
> > 
> > Guido
> > 
> > 
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