topic Re: Linux Machine restarting in Operating System - Linux

Linux Machine restarting

Pankaj_22 — Fri, 21 Oct 2005 13:07:22 GMT

I have 2 Linux WS Enterprise machines. They automatically restart at 4.21 & 4.22 AM. on every sunday.

I have seen the log and shutdown is proper without any prob. Also it is not through any user account. I reset the password of Root also but still no use.

please guide me

Re: Linux Machine restarting

Ivan Ferreira — Fri, 21 Oct 2005 13:18:26 GMT

We had authomatic ordered shutdown because a hardware problem. In our case, was a memory fan that stopped working, and when the temperature reached some level, the system shutdowns automatically.

Verify for hardware/temperature problems.

Re: Linux Machine restarting

Ivajlo Yanakiev — Sat, 22 Oct 2005 04:21:40 GMT

check you CRONTAB config !

Re: Linux Machine restarting

Ivan Ferreira — Sat, 22 Oct 2005 18:01:54 GMT

Agree with the above post. You can use grep shutdown /var/spool/cron/*, grep reboot /var/spool/cron/*, and also verify the /etc/crontab file, and the /etc/cron.d directory.

Re: Linux Machine restarting

Pankaj_22 — Mon, 24 Oct 2005 01:28:59 GMT

I have checked Temperature prob. I have checked all the

\cron.d ; \crontab; \cron\*

But I dont found anything

Re: Linux Machine restarting

Muthukumar_5 — Mon, 24 Oct 2005 02:04:42 GMT

May be user defined script which is running in background and executing reboot.

Check with shutdown log file to find which user is executing script?

hth.

Re: Linux Machine restarting

Pankaj_22 — Mon, 24 Oct 2005 02:41:38 GMT

Sorry guys but nothing in Log.

Re: Linux Machine restarting

Pankaj_22 — Mon, 24 Oct 2005 03:01:33 GMT

Machine is rebooting with proper shutdow. Machine is restarting at exact 4.02 AM nobody is there in office that time. Also we change the root password so that noone can shutdown the machine but still its happening.

Re: Linux Machine restarting

Matti_Kurkela — Mon, 24 Oct 2005 05:47:59 GMT

4.22 AM on Sunday? That is exactly the default time when RedHat runs all things found in directory /etc/cron.weekly. Check all the files in that directory.

If you have already checked that, remember that the shutdown command might not be "shutdown" or "reboot". It might be "init 6" or "telinit 6": they all produce the same result.

(The time is set at /etc/crontab, which calls the "run-parts" script to run all files marked as executable in a given directory. This is primarily so that individual packages can add things to /etc/cron.[hourly|daily|weekly|monthly] directories as appropriate.)

Re: Linux Machine restarting

Pankaj_22 — Mon, 24 Oct 2005 06:41:44 GMT

I have tried with all the things but copuld not get anything. I have attached crontab file, please suggest if you can do something. Thank you

Re: Linux Machine restarting

Jess Long — Mon, 24 Oct 2005 14:40:01 GMT

Look at the /var/log/cron logfile. If 'cron' is executing a script at or about the time the system is rebooting, then checkout that script. If only the cron.daily or cron.weekly scripts are run at that time, then, I would suspect one of the scripts in the appropriate directory.

I would also check /etc/anacrontab.

Re: Linux Machine restarting

Ivan Ferreira — Mon, 24 Oct 2005 15:18:06 GMT

It should be a script in /etc/cron.weekly. What is the contents of that directory?

The files in that directory runs every sunday at 4.22 AM.

Re: Linux Machine restarting

Pankaj_22 — Tue, 25 Oct 2005 05:38:48 GMT

Sorry guys I have checked out the Cron Weekly also but there is no thread of init6,telinit6 or shutdown,reboot.

So please suggest now.

Re: Linux Machine restarting

Ivan Ferreira — Tue, 25 Oct 2005 07:01:33 GMT

Maybe there is not an explicit shutdown, what is the contents of the directory, it may be another services that at end reboots the computer.

Re: Linux Machine restarting

Pankaj_22 — Tue, 25 Oct 2005 23:23:10 GMT

I have checked the contenet of etc/cron.weekly and that have only one file.Attached with this reply.

Please suggest now.

Re: Linux Machine restarting

Eric Leung_2 — Wed, 26 Oct 2005 01:11:26 GMT

I have the similiar problem. One of my 2 Red Hat Linux ES server will automatically reboot itself irregularly. I must stress that the server was shutdown gracefully.

I have checked all my cron setup and nothing wrong or related could be identified.

As the server is located in a secured computer suite, the possibility of unauthorised access is low.

Any idea?

Re: Linux Machine restarting

Ivan Ferreira — Wed, 26 Oct 2005 06:51:30 GMT

Try moving that file out that directory. The problem is that it's executed exactly at the time of the reboots, that's why we need to be really sure that this is not the issue.

To verify that the makewhatis command wasn't replaced by a trojan (that instead ejecuting the makewhatis is rebooting the system), use the following command:

rpm -V man

You should have no output if all it's fine.

Re: Linux Machine restarting

Pankaj_22 — Thu, 27 Oct 2005 23:33:13 GMT

Ivan I have checked your option and their is no reply for that command.

Tell me what to do next.