CentOS - Apr 2007 - Bringing up interface eth0:

I'm installing CentOS 4.4 64-bit Enterprise on  a Dell Dimension with 
and AMD dual core 3800+.  When it starts to load eth0 it hangs. I have 
not found a way to break out of it. Or how to boot at run level 0. So 
newby Question 1 how do I get it to boot without loading eth0 so I can 
make changes? Question 2 what is a likely problem and fix. Question 3 
what is good documentation and other resource to find answers for sys 
admin questions.

Thanks,
Russ

On Sat, April 28, 2007 9:46 am, Russ wrote:
> I'm installing CentOS 4.4 64-bit Enterprise on  a Dell Dimension with
> and AMD dual core 3800+.  When it starts to load eth0 it hangs. I have
> not found a way to break out of it. Or how to boot at run level 0. So
> newby Question 1 how do I get it to boot without loading eth0 so I can
> make changes? Question 2 what is a likely problem and fix. Question 3
> what is good documentation and other resource to find answers for sys
> admin questions.
>
> Thanks,
> Russ
Is eth0 setup for DHCP?  If so just unplug the cable and then boot up.

Otherwise you can boot from the CentOS CD/DVD and type "linux rescue"
at
the boot: prompt and the follow the prompts.  Then you can get access to
all of the files on the system to make modifications.


-- 
Matt Martz
CentOS Mirror Admin
mdmartz at gflug.net

On Sat, Apr 28, 2007 at 08:46:02AM -0500, Russ wrote:
> I'm installing CentOS 4.4 64-bit Enterprise on  a Dell Dimension with 
> and AMD dual core 3800+.  When it starts to load eth0 it hangs. I have 
> not found a way to break out of it. Or how to boot at run level 0. So 
> newby Question 1 how do I get it to boot without loading eth0 so I can 
> make changes?
There's no runlevel 0. You want runlevel 1 or 2. You can boot to any
runlevel by specifying it as an argument on boot. For instance, when
your computer starts and grubs presents the kernel it is about to boot,
press any key to abort automatic boot and then press 'a' and add the 1
(or s) and then press enter.

This changes for xen boots or some other distributions without (a)ppend
support in grub. For those, press 'e', select the line with the kernel
image and add the 1 to it.

If you just don't want to start networking, the boot process tells you
to press 'I' for an interactive boot. (I think it's 'I', I
don't usually
use it.)
> Question 2 what is a likely problem and fix.
I suspect your system isn't getting answers for its dhcp requests. If
that's the cause, it should timeout after some time, and you can set an
fixed IP address to avoid dhcp altogether.

If it hardlocks, then you probably have a hardware problem, possibly
related to interrupts ("try booting with the options acpi=off noapic
nolapic"). You can see if it hardlocked by pressing ctrl+alt+del, if
it's still live it will start the reboot process.
> Question 3 
> what is good documentation and other resource to find answers for sys 
> admin questions.
 

The Linux Documentation Project (tldp.org) has some good howtos and
guides. Somewhat outdated in some cases, but still good reading.

There are also some books on Linux and RedHat administration (CentOS is
based on RedHat).

And then there's /usr/share/doc and the man pages, that have a lot of
usefull info.

-- 
lfr
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