06-01-2005
@Tom: Many thanks, the explanations are good, but i got so far already.
My (at least my, I don't know about Dylan but suppose he will run into similar problems) problem is: I can at one point make sure i have exchanged all the necessary keys and then run some script. But i cannot ensure this for any future and for any host because sometimes the exchanged keys become invalid and the next execution of ssh would ask for a new authentication.
For example: I have long worked on IBMs SP/2 platform and there was a mechanism called "distributed shell". It was a (kerberized) wrapper around rsh with which it was possible to execute a command on one, several or all nodes simultaneously. Issuing 'dsh "date"' would result in an output like:
# dsh "date"
foo1: Wed Jun 1 09:33:18 MSZ 2005
foo2: Wed Jun 1 09:33:19 MSZ 2005
foo3: Wed Jun 1 09:33:19 MSZ 2005
foo4: Wed Jun 1 09:33:18 MSZ 2005
...
Since the SP/2 (and with it PSSP and its successor Cluster/1600) is long gone I tried to write a script imitating this behavior. Neither does it run regularly nor does it always run on the same list of machines. The script is working perfectly as long as all the keys are (AND STAY) exchanged, but once a key is missing the script hangs.
Maybe i'm overseeing something really stupid here, but i haven't found out what to do in this case.
*sigh* back then in the good old days of kerberos things were less complicated - but then, who'd have guessed back then that once these times would be regarded as 'good'? ;-))
bakunin
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LEARN ABOUT DEBIAN
safe_asterisk
SAFE_ASTERISK(8) Linux Programmer's Manual SAFE_ASTERISK(8)
NAME
safe_asterisk -- A wrapper to run the asterisk executable in a loop
SYNOPSIS
safe_asterisk [ asterisk_params ]
DESCRIPTION
safe_asterisk is a script that runs asterisk in a loop, which can be useful if you fear asterisk may crash.
The script does not run in the background like a standard service. Rather, it runs in its own linux virtual console (9, by default). It
also uses the option '-c' of asterisk(8) to avoid detaching asterisk from that terminal.
safe_asterisk also runs asterisk with unlimited core file size, and thus asterisk will dump core in case of a crash.
To get a "picture" of console 9, from another terminal (e.g: from a remote shell session) you can use:
screendump 9
The init script of the Debian package should be able to run safe_asterisk as the asterisk service, if so configured. See coments in
/etc/default/asterisk
FILES
/tmp
safe_asterisk runs in that directory, rather than in / as usual.
/tmp/core
If core files were generated there, they may be
/etc/asterisk/startup.d
Files in this directory will be 'source'd by the safe_asterisk script before it starts Asterisk proper, allowing them to set addi-
tional environment variables or run any other steps that are needed for your system.
BUGS
While showing the output on a console is useful, using screen(1) as the terminal may be better.
The script does not read configuration from standard location under /etc
It uses fixed locations under /tmp , and thus may be exposed to a symlink attacks.
SEE ALSO
asterisk(8), screendump(9)
AUTHOR
This manual page was written by Tzafrir Cohen <tzafrir.cohen@xorcom.com> Permission is granted to copy, distribute and/or modify this docu-
ment under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2.
Asterisk Jun 30th, 2005 SAFE_ASTERISK(8)