Can't log into Centos

wasamzy · 03-05-2010, 10:59 AM

I have a centos server running nagios for monitoring. I restarted the machine, it is actually a console server anyway. After getting to the login screen, I typed in my user name but it never propt for my password. I can't even ssh into the system.

So I tried to use the installation cd and enter into rescue mode where I typed chroot and was able to enter into the root environment.
I was able to configure a network interface in the rescue mode and can ping the machine at this point, though can ssh still.

In the root environment, I tried running couple commands.
like try to restart the sshd.
When I typed /etc/init.d/sshd restart, I got an error saying:

766 segmentation fault.

when I vi any thing I get error:
segmentation fault.

Please how can I solve this problem? What is causes this.

Even in the event of restarting the machine, I see so many fails with segmentation fault.

LazerPhreak · 03-05-2010, 11:05 AM

Well the segmentation faults can be explained from the login problem, with programs trying to access unauthorized resources. As for being unable to login, can you try to boot into runlevel 1 to fix things?

wasamzy · 03-05-2010, 12:07 PM

Thanks so much for the quit respond. But how can I boot into runlevel 1?

LazerPhreak · 03-05-2010, 12:36 PM

On an x86 system using GRUB, use the following steps to boot into runlevel 1.

At the GRUB splash screen at boot time, press any key to enter the GRUB interactive menu.

Select Red Hat Enterprise Linux with the version of the kernel that you wish to boot and type a to append the line.

Go to the end of the line and type single as a separate word (press the Spacebar and then type single). Press Enter to exit edit mode.

wasamzy · 03-06-2010, 03:29 AM

thanks. Hmmm, how do I know which files are broken or not? Or can I just use the installation CD to just over install the existing OS with out changing any data, just for the broken system files to be repair?

centosboy · 03-06-2010, 03:08 PM

Quote:

Originally Posted by wasamzy

I have a centos server running nagios for monitoring. I restarted the machine, it is actually a console server anyway. After getting to the login screen, I typed in my user name but it never propt for my password. I can't even ssh into the system.

So I tried to use the installation cd and enter into rescue mode where I typed chroot and was able to enter into the root environment.
I was able to configure a network interface in the rescue mode and can ping the machine at this point, though can ssh still.

In the root environment, I tried running couple commands.
like try to restart the sshd.
When I typed /etc/init.d/sshd restart, I got an error saying:

766 segmentation fault.

when I vi any thing I get error:
segmentation fault.

Please how can I solve this problem? What is causes this.

Even in the event of restarting the machine, I see so many fails with segmentation fault.

how long has this installation been running for??
You might need to use the rescue disk to repair your installation. Sounds totally broken...
The main question(s) would be...

What has changed since the system last ran correctly?
Have you updated, added or removed any software since the system last ran correctly??
Could the system have been compromised??

Just a few of the questions you need to ask yourself first..