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Old 02-17-2008, 08:25 PM   #1
Stevie-B-242
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Simple rsh issue


...once again, I'm obviously a newbie with a question like this but here's a chance to solve a simple issue and in the process show that you are smarter than me. %-)

I'm trying to configure and enable rsh on a node in a small Linux cluster (RHEL 5).

I've modified
/etc/xinetd.d/rsh
/etc/xinetd.d/rlogin
/etc/xinetd.d/rexec
to set "disable = no"

added lines for rsh and rlogin to /etc/securetty

and then issued a #services xinetd restart

but when I try to test rsh locally on the node, I get the following:

[root@C1-N1 ~]# rsh localhost
connect to address 127.0.0.1 port 543: Connection refused
Trying krb4 rlogin...
connect to address 127.0.0.1 port 543: Connection refused
trying normal rlogin (/usr/bin/rlogin)
Password:

I imagine I've made a really simple mistake somewhere along the way...do you know where I've gone wrong?

Thanks in advance for any help you can offer on this!

--Steve
 
Old 02-17-2008, 08:36 PM   #2
Simon Bridge
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Quote:
I'm trying to configure and enable rsh
... do not use rsh, use ssh.

http://www.fnal.gov/docs/strongauth/encryptconn.html
 
Old 02-17-2008, 08:45 PM   #3
Stevie-B-242
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...thanks for the quick reply Simon.

I know that SSH is vastly preferred in most instances to rsh because SSH is secure and rsh is not.

However, as I mentioned in a different thread today, this is for a small lab cluster which is completely isolated from the outside world.

...In this instance, I'm not looking for the most secure implementation... I just desperately need something that I can get working right now.

Thanks.
--Steve

Last edited by Stevie-B-242; 02-17-2008 at 08:47 PM.
 
Old 02-17-2008, 08:54 PM   #4
Simon Bridge
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ssh is also easier/easier to set up.
(I think I replied to your other thread... lost track...)
http://suso.org/docs/shell/ssh.sdf
 
Old 02-18-2008, 06:00 PM   #5
custangro
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You need to have a .rhosts in the home directory of the user you are trying to rsh as....

~/.rhosts

You need to put the IP address (or if you have DNS set up the fqdn) in the file.

And Simon Bridge is right...don't use rsh...

-C
 
Old 09-24-2009, 07:11 AM   #6
IanVaughan
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Yes SSH might be better than RSH, but rsh can allow commands to be sent.
As I want to script some actions from a remote host that are to be performed on the target, rsh is better.
 
Old 09-24-2009, 07:16 AM   #7
pwc101
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What's stopping you from sending those commands with SSH?
Code:
ssh user@remotehost "date > didthiswork"
I just tested this and it successfully created a file called didthiswork on the remote host.
 
Old 09-24-2009, 09:27 AM   #8
IanVaughan
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Yep, basic commands work, but what about shell type/env setup?
SSH with and without command gives different results? env is different?

works as expected
Code:
[a ~]$ ssh 172.24.40.100
Last login: Mon Jan  1 06:07:24 2001 from 172.24.41.78
[b ~]# /path/script.sh
gives me error consistent with env setup
Code:
[a ~]$ ssh 172.24.40.100 /path/script.sh
Which implies the latter is running the script.sh on host a, when I want to
'launch' in from a, and 'run' it on b!?
 
Old 09-24-2009, 09:32 AM   #9
IanVaughan
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Redirecting my previous question to here as more on subject.
 
Old 09-24-2009, 09:47 AM   #10
pwc101
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How about sourcing the profile before running the command?
Code:
ssh user@host "source /etc/profile; /path/script.sh"
You might find it best to change that to ~/.bash_profile, ~/.bashrc, or whatever.
 
Old 09-24-2009, 10:08 AM   #11
IanVaughan
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Quote:
Originally Posted by pwc101 View Post
How about sourcing the profile before running the command?
Code:
ssh user@host "source /etc/profile; /path/script.sh"
You might find it best to change that to ~/.bash_profile, ~/.bashrc, or whatever.
Code:
ssh 172.24.40.100 "source /root/.bash_profile; /path/script.sh"
Worked! You ppl are great! Cheers.
 
Old 09-24-2010, 09:19 AM   #12
felton57
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My problem is the same as above. Here is my dilemma:

I want to shutdown a number of computers in my lab. Hostnames are jmud1, jmud2, jmud3 and jmud4 .... jmud20.

Current script or command used:

#!/bin/csh

foreach num (`/root/tools/machines`)
rsh jmud{num} /sbin/shutdown -hy 0 &

end

#End of Script

How do I replace is with ssh or something useable in RHEL5?
 
Old 09-24-2010, 10:15 AM   #13
pwc101
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Without knowing what /root/tools/machines does or contains, I'll assume it has the hostnames on separate lines in it. If so, then you could try:
Code:
#!/bin/bash

# Iterate through each remote host in the file /root/tools/machines 
while read rhost; do
    ssh root@$rhost "/sbin/shutdown -h now"
done < /root/tools/machines
You'll have to ssh in as root (often considered a bad idea), or set up sudo to allow a different, less privileged user to execute /sbin/shutdown.

Edit: You can also specify users who are allowed to shutdown the machine in /etc/shutdown.allow without the need to set up sudo. You do need to pass -a to the shutdown command, though. See man shutdown for more info.

Last edited by pwc101; 09-24-2010 at 10:22 AM.
 
  


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