Gentoo Archives: gentoo-user

From: Albert Hopkins <marduk@g.o>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Sending console messages on Users
Date: Mon, 28 May 2007 19:20:09
Message-Id: 1180379678.8155.25.camel@blackwidow.nbk
In Reply to: [gentoo-user] Sending console messages on Users by Mick
1 On Mon, 2007-05-28 at 18:52 +0100, Mick wrote:
2 > Hi All,
3 >
4 > What is the way to send a console warning to anyone logged on a machine before
5 > I reboot it?
7 shutdown(8) does this for you. In addition there is wall(1).
9 >
10 > If the user is logged on a console I will only need to send it to the console;
11 > in addition if the user is running webmin, or phpadmin, then I would really
12 > like a popup of sorts to alert them to log out (something like the net send
13 > command on MS Windows running with the messenger service).
14 >
15 > Is there such a thing?
17 I could give a long explanation on why in practice this never works
18 (even for wall msgs), but it's not interesting. Instead I'll give you
19 some real-world examples of what I've seen.
21 * Don't plan reboots during production or when production is at
22 peak unless absolutely necessary. In the latter case most
23 people will be expecting a reboot because they are aware of a
24 problem that is affecting production.
25 * For small shops, it's just as easy, and more effective, to just
26 go door-to-door letting everyone know there's going to be a
27 reboot.
28 * Nearly every medium-large place I've worked had an overhead
29 speaker system (dunno why, call me lucky) where unexpected
30 crashes and reboots were broadcast.
31 * For planned reboots, one site I worked sent out broadcast emails
32 periodically before a scheduled reboot. There was a monthly
33 schedule sent out as well as an email the week ans shortly
34 before the reboot. This was a multi-platform, nation-wide
35 operation and basically there was no universal way to let
36 everyone know. Even for the single-platform shop I worked at,
37 not everyone (that was affected) sat in front of a terminal. All
38 relevant people or their supervisors were on the mailing list.
39 If you didn't know, you didn't need to know.
40 * Not even the Windows shop I worked at used net send to alert of
41 reboots. Maybe nice idea, but it doesn't work. People are away
42 from their computers, have the messenger service turned off,
43 just click OK without reading the message, etc. etc. All that
44 net send every did in my experience is generate a lot of phone
45 calls from people who didn't understand what it was or what it
46 meant.
47 * The most effective way I've seen was a recent job. They simply
48 announced on the loud speaker for everyone to log off and shut
49 down until further notice. There was no reboot announcement, no
50 explanation. Nothing. Even if a person wasn't affected
51 everyone was told to log out and turn off their machines. This
52 eliminated the phone calls from people asking "does this mean
53 me?" We just had everyone off. For stragglers, VPN users, etc.
54 They were manually disconnected. Let them figure out what
55 happened when they get back.
57 As for webmin and phpadmin users... well those people are
58 administrators... shouldn't they already know? I wouldn't want a fellow
59 admin bouncing a server without tapping me on the shoulder or giving me
60 a call. Technology is rarely a good replacement for common sense.
63 --
64 Albert W. Hopkins
66 --
67 gentoo-user@g.o mailing list


Subject Author
Re: [gentoo-user] Sending console messages on Users Mick <michaelkintzios@×××××.com>