Xen users - Nov 2007 - CentOS 5.0 ifcfg-eth0 gets renamed on boot

Hello,

I created a CentOS 5.0 x86_64 guest under Debian Etch with Xen 3.0.3 and it
boots fine except for one re-occuring problem - whenever it boots the
/etc/sysconfig/network-scripts/ifcfg-eth0 script gets renamed to .bak and
doesn''t configure the ethernet device.

Here is the content of this file:

TYPE=Ethernet
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.0.247
NETMASK=255.255.255.0
GATEWAY=192.168.0.2

Looks pretty standard to me.

When I boot the system to single-user mode the file is still there but when
I ^D to go to multi-user the file gets renamed at some stage.

A simple "mv ifcfg-eth0.bak ifcfg-eth0" and "service network
restart" fixes
the problem but it''s still very annoying to have to do that every time
i
reboot the system (luckily these are just test/dev machines for now).

I tried to follow the output of the boot in the console but can''t see
anything wrong, and can''t find what in the world could do this renaming
at
boot time.

What am I missing?

Thanks,

--Amos


_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Amos Shapira schrieb:
> Hello,
> 
> I created a CentOS 5.0 x86_64 guest under Debian Etch with Xen 3.0.3 and
> it boots fine except for one re-occuring problem - whenever it boots the
> /etc/sysconfig/network-scripts/ifcfg-eth0 script gets renamed to .bak
> and doesn''t configure the ethernet device.
you should set a mac address in your domU config file.

e.g.
vif  = [ ''mac=00:00:cb:62:fd:7f,bridge=xenbr0'' ]

otherwise the interface changes it''s mac every time the domU is brought
up.




> Here is the content of this file:
> 
> TYPE=Ethernet
> DEVICE=eth0
> BOOTPROTO=static
> ONBOOT=yes
> IPADDR=192.168.0.247 <http://192.168.0.247>
> NETMASK=255.255.255.0 <http://255.255.255.0>
> GATEWAY=192.168.0.2 <http://192.168.0.2>
> 
> Looks pretty standard to me.
> 
> When I boot the system to single-user mode the file is still there but
> when I ^D to go to multi-user the file gets renamed at some stage.
> 
> A simple "mv ifcfg-eth0.bak ifcfg-eth0" and "service network
restart"
> fixes the problem but it''s still very annoying to have to do that
every
> time i reboot the system (luckily these are just test/dev machines for
> now).
> 
> I tried to follow the output of the boot in the console but can''t
see
> anything wrong, and can''t find what in the world could do this
renaming
> at boot time.
> 
> What am I missing?
> 
> Thanks,
> 
> --Amos
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

-- 
Stephan Seitz
Senior System Administrator

*netz-haut* e.K.
multimediale kommunikation

zweierweg 22
97074 würzburg

fon: +49 931 2876247
fax: +49 931 2876248

web: www.netz-haut.de <http://www.netz-haut.de/>

registriergericht: amtsgericht würzburg, hra 5054



_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Amos Shapira wrote:
> Hello,
> 
> I created a CentOS 5.0 x86_64 guest under Debian Etch with Xen 3.0.3 and 
> it boots fine except for one re-occuring problem - whenever it boots the 
> /etc/sysconfig/network-scripts/ifcfg-eth0 script gets renamed to .bak 
> and doesn''t configure the ethernet device.
> 
> Here is the content of this file:
> 
> TYPE=Ethernet
> DEVICE=eth0
> BOOTPROTO=static
> ONBOOT=yes
> IPADDR=192.168.0.247 <http://192.168.0.247>
> NETMASK=255.255.255.0 <http://255.255.255.0>
> GATEWAY=192.168.0.2 <http://192.168.0.2>
> 
> Looks pretty standard to me.
> 
> When I boot the system to single-user mode the file is still there but 
> when I ^D to go to multi-user the file gets renamed at some stage.
> 
> A simple "mv ifcfg-eth0.bak ifcfg-eth0" and "service network
restart"
> fixes the problem but it''s still very annoying to have to do that
every
> time i reboot the system (luckily these are just test/dev machines for 
> now).
> 
> I tried to follow the output of the boot in the console but can''t
see
> anything wrong, and can''t find what in the world could do this
renaming
> at boot time.
> 
> What am I missing?
> 
> Thanks,
> 
> --Amos
> 
Is that http:// debris actually in your file, or is that some sort of gmail
rendering error?

RedHat also has a tradition of stuffing some interesting little files in
/etc/sysconfig/ for resetting network configurations. Slightly different
configuration tools, such as system-config-network, set them differently and
they propagate oddly if you try editing things manually. Try using
system-config-network.

Also, don''t you have a hard-coded MAC address for the guest? Something
that you can put as "HWADDR=<MACADDRESS>" in your ifcfg-eth0
file?

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

On 13/11/2007, Stephan Seitz <s.seitz@netz-haut.de>
wrote:
>
> Amos Shapira schrieb:
> > Hello,
> >
> > I created a CentOS 5.0 x86_64 guest under Debian Etch with Xen 3.0.3
and
> > it boots fine except for one re-occuring problem - whenever it boots
the
> > /etc/sysconfig/network-scripts/ifcfg-eth0 script gets renamed to .bak
> > and doesn''t configure the ethernet device.
>
> you should set a mac address in your domU config file.
>
> e.g.
> vif  = [ ''mac=00:00:cb:62:fd:7f,bridge=xenbr0'' ]
>
> otherwise the interface changes it''s mac every time the domU is
brought
> up.

Thanks. That worked. I let the machine boot, copied the assigned MAC to the
.cfg file, and it started configuring eth0 automatically after the next
boot.

I''m still curios to understand what actually goes there, does the
"Checking
for hardware configuration changes" boot stage do the renaming?

--Amos


_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Amos Shapira wrote:
> On 13/11/2007, *Stephan Seitz* <s.seitz@netz-haut.de 
> <mailto:s.seitz@netz-haut.de>> wrote:
>
>     Amos Shapira schrieb:
>     > Hello,
>     >
>     > I created a CentOS 5.0 x86_64 guest under Debian Etch with Xen
>     3.0.3 and
>     > it boots fine except for one re-occuring problem - whenever it
>     boots the
>     > /etc/sysconfig/network-scripts/ifcfg-eth0 script gets renamed to
>     .bak
>     > and doesn''t configure the ethernet device.
>
>     you should set a mac address in your domU config file.
>
>     e.g.
>     vif  = [ ''mac=00:00:cb:62:fd:7f,bridge=xenbr0'' ]
>
>     otherwise the interface changes it''s mac every time the domU
is
>     brought up. 
>
>
> Thanks. That worked. I let the machine boot, copied the assigned MAC 
> to the .cfg file, and it started configuring eth0 automatically after 
> the next boot.
>
> I''m still curios to understand what actually goes there, does the 
> "Checking for hardware configuration changes" boot stage do the
renaming?
>
> --Amos
Read the scripts in /etc/sysconfig/network-scripts/. I think it''s
there,
and there''s a lot of fascinating stuff buried there, such as setting
the
hostnames for DHCP by creating a file called /etc/dhclient-eth0.

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

On 13/11/2007, Nico Kadel-Garcia <nkadel@gmail.com>
wrote:
>
> Amos Shapira wrote:
> Is that http:// debris actually in your file, or is that some sort of
> gmail rendering error?

No they are not in the script, was added by GMail.

RedHat also has a tradition of stuffing some interesting little files
in
> /etc/sysconfig/ for resetting network configurations. Slightly different
> configuration tools, such as system-config-network, set them differently
and
> they propagate oddly if you try editing things manually. Try using
> system-config-network.

Tried to install it but it pools down too much X11-related crap I don''t
want
on my servers.

Also, don''t you have a hard-coded MAC address for the guest? Something
that
> you can put as "HWADDR=<MACADDRESS>" in your ifcfg-eth0
file?
>
Tried both with "HWADDR" and "MACADDR" (the later will
actually force the
ethernet address on the card) but it didn''t work.

I also change "BOOTPROTO" from "static" to "none"
as per the docs.

I suspect by the time the script is read it''s too late, it gets renamed
by
something which probes the hardware (kudzu? hotplug?) earlier in the boot
process.

Thanks for the advise.

--Amos


_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

On 14/11/2007, Nico Kadel-Garcia <nkadel@gmail.com>
wrote:
>
> Read the scripts in /etc/sysconfig/network-scripts/. I think it''s
there,
> and there''s a lot of fascinating stuff buried there, such as
setting the
> hostnames for DHCP by creating a file called /etc/dhclient-eth0.
>
That''s the first thing I did long before bothering the list with my
question
but couldn''t find anything wrong with the input I provide.
I also tried to look for anything which mentions "bak" under /etc
(since the
file is renamed to ".bak") but couldn''t find anything.

The interesting thing is that simply renaming the file back to remove the
".bak" extension and restarting the network works well, which my hunch
tells
me sits well with the MAC address getting changed on reboot and kudzu or
hotplug deciding that it''s a new piece of hardware and possibly
renaming the
script to force a re-configuration, but I''m just guessing.

Cheers,

--Amos


_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users