topic Re: rsh hanging in Operating System - Linux

rsh hanging

B.O — Tue, 05 Jun 2007 08:07:27 GMT

Hello all, a lot of my scripts hang because you cannot rlogin into these systems. The script says ping systemA, if pingable, then rsh systemA w etc.
These systems are pingable, but you cannot rsh into them. It's often resolved after a reboot. What can i check pls or how can i include in the script to termintate if rsh hanging?
Thanks.

Re: rsh hanging

Steven E. Protter — Tue, 05 Jun 2007 11:13:32 GMT

Shalom,

On the target system:
tail -f /var/log/messages

run your script.

If that yields no data, try using tdpdump

SEP

Re: rsh hanging

skt_skt — Tue, 05 Jun 2007 20:18:52 GMT

I would recommend ssh instaed.More secure. Still we need to identify why the rsh hangs.

Re: rsh hanging

B.O — Wed, 06 Jun 2007 05:43:15 GMT

Thanks. I'm using rsh because the scripts need to run some commands on several of linux systems: rsh systemA uptime; rsh systemA ls - al xxxx etc. These scripts are run from the crontab.
Moreover, ssh will require root password, hence only good during interactive sessions.
I just need to know if there's something to include in the script for the rsh to terminate rather than hang.
Thank you.

Re: rsh hanging

skt_skt — Wed, 06 Jun 2007 22:07:08 GMT

password less ssh can be set up too.

Login with "applmgr"(example) account and check if you have these files -
/home/applmgr/.ssh/id_rsa
/home/applmgr/.ssh/id_rsa.pub

If not then run;

ssh-keygen -t rsa

example -
$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/sharma/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/sharma/.ssh/id_rsa.
Your public key has been saved in /home/sharma/.ssh/id_rsa.pub.
The key fingerprint is:
c1:a8:1d:f8:e5:a4:79:10:d3:5c:d8:90:72:0d:f0:84 sharma@hostname

Now copy the contents of source "/home/applmgr/.ssh/id_rsa.pub" to dest "/home/applmgr/.ssh/authorized_keys". Append in case the authorized file already exists on dest

P.S - The public/private key pair needs to be generated only once via ssh-keygen and thereafter same keys can be copied to "authorized_keys" on diff. servers for passwordless entry.

Re: rsh hanging

B.O — Fri, 08 Jun 2007 02:55:23 GMT

Thanks, i'll try it out. But i doubt that's what i need because i need to run these scripts as root, and not as myself.
Thanks.

Re: rsh hanging

skt_skt — Fri, 08 Jun 2007 22:18:47 GMT

similar ssh relation can be mase for all acconts including root