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From: mjranum@gouldsd.UUCP (Marcus J. Ranum)
Newsgroups: net.unix,net.unix-wizards,net.decus
Subject: Re: Automatic unattended execution of 'dump' ?
Message-ID: <176@gouldsd.UUCP>
Date: Sun, 14-Sep-86 08:33:28 EDT
Article-I.D.: gouldsd.176
Posted: Sun Sep 14 08:33:28 1986
Date-Received: Sun, 14-Sep-86 20:24:10 EDT
References: <128@morgoth.UUCP>
Organization: Gould Inc, ASDD, Landover, MD
Lines: 34
Keywords: Ultrix 1.2, dump, backup, uVAX II
Summary: timed dumps
Xref: mnetor net.unix:5478 net.unix-wizards:7877 net.decus:405

In article <128@morgoth.UUCP>, glidden@morgoth.UUCP (Ken A. Glidden) writes:
> 
>   We have a uVAX II running Ultrix 1.2.  I'd like very much to use
> the crontab to start up a shell script late at night to perform 
> a dump.   Specifically I'd like the shell script to "simulate"
> single user mode by preventing any logins, killing any processes which
> have the potential to alter the disk during the dump, and preventing 
> any processes which may alter the disk during the dump from starting
> while the dump is in progress.  Once finish the script should undo all
> its protections and allow business as usual.

	Um, how about something cheesy like this: 
1)create /etc/nologin.
2)log out your users (for a in `ps -ag | sed /root/d | awk print{$1} `;do
	kill -9 $a; done     or something equally sleazy
3)run dump
4)remove /etc/nologin
5)voila
	to prevent crontab processes from fiddling with the disks, make
sure your crontab is corretly tuned.

  I have a set of shell scripts that do this in a rather more sophisticated
manner, but I can't send 'em to you.  You might want to trap exit statuses,
and print results, etc, etc...   Since you have a relatively small system,
really think the best way to solve your problem is to just do everything in
a simple shell script.

Live Free
mjr
-- 
 
I raised my knife to it:
Some fresh young morning-glory
As we too, alas...