cluster script

assasukasse · 05-03-2006, 03:41 AM

now a more interesting problem:
i am running a temporary cluster using parallelknoppix
a knoppix derivative with ssh enabled
the program i use for parallel calculation REQUESTS
that i have telnet and rsh installed on all machine and that ALL of them are accessible via telnet and rsh..it uses them to sync the tasks
i wish to make a script, that when run from the master node via ssh on all the slaves would install telnet and telnetd, rsh and rshd on all the machines including the master, and immediately start the services.
i can't reboot in between since its a live distro and every change would be lost.
i have no clue how to do that and i wish some hints..
thanks!

assasukasse · 05-03-2006, 06:43 AM

i made this template..maybe someone could correct it:

script.sh

Code:

#!/bin/sh
for machine in /home/knoppix/hostdef
do
ssh $machine sh installer.sh &
done

installer.sh

Code:

#!/bin/sh
sudo apt-get update
sudo apt-get install rshd telnetd telnet rlogin rsh
sudo /etc/rc.d/rshd start
sudo /etc/rc.d/telnetd start
done

any idea?

muha · 05-03-2006, 06:55 AM

I'd recommend using key-phrases but this article has a nice start for a script without them:
http://www.linuxjournal.com/comment/reply/8600

assasukasse · 05-03-2006, 09:21 AM

further investigation made me know that only RSH is needed!

assasukasse · 05-03-2006, 12:01 PM

again
on echelon website i found this script used to update ssh

Code:

#!/bin/bash
for ((i=1; i <= 30 ; i++)) #run through all nodes
do
echo updating node $i
scp /etc/passwd e$i:/etc/
scp /etc/passwd- e$i:/etc/
scp /etc/shadow e$i:/etc/
scp /etc/shadow- e$i:/etc/
scp /etc/gshadow e$i:/etc/
scp /etc/gshadow- e$i:/etc/
scp /etc/group e$i:/etc/
scp /etc/group- e$i:/etc/
done
echo all passwords updated

also they found a way to override the need for rsh..

Quote:

Perhaps the easiest way to avoid using rsh is to use ssh interchangeably.
One may simply uninstall all rsh,rcp and rlogin programs from the system
then link ssh, scp, and slogin to the corresponding r names.
The s programs have been designed to function exactly the same as the r
programs except in a secure manner.
However, some programs will still require the hosts.equiv and .rhosts file
to ascertain cluster information.
These can be created in the normal method but without the actual rprograms
installed on the system they don’t pose any security threat.

so this is the final solution..
but my knowledge of linux doesn't allow me to apply it easily..
should i make symlinks to ssh scp and slogin and name the symlinks as rsh rcp and rlogin?
and again, should this be done on every node or i can script it?
thanks!

assasukasse · 05-03-2006, 12:47 PM

would this do the trick?

Code:

#!/bin/sh
for machine in /home/knoppix/hostdef
do
ssh $machine 'ln -s /usr/bin/ssh /usr/bin/rsh ;\
ln -s /usr/bin/scp /usr/bin/rcp ;\
ln -s /usr/bin/slogin /usr/bin/rlogin'
done