Re: [K12OSN] RE: rsh server to server for applications

[Martin Stevens <mstevens chace enfield sch uk>]

Thanks, that get me part of the way.

I can ssh in to the application server and run X applications, that
works fine.

But the whole rsh thing is causing troubles

Do I need to have NIS setup and working ? 

Should I have /home/ mounted on the application server?


I'm probably missing a crucial step here.

Here's a terminal log,

[mstevens mercury mstevens]$ ping earth
PING earth (192.168.0.253) 56(84) bytes of data.
64 bytes from earth (192.168.0.253): icmp_seq=1 ttl=64 time=0.335 ms
64 bytes from earth (192.168.0.253): icmp_seq=2 ttl=64 time=0.321 ms
64 bytes from earth (192.168.0.253): icmp_seq=3 ttl=64 time=0.273 ms
64 bytes from earth (192.168.0.253): icmp_seq=4 ttl=64 time=0.251 ms

--- earth ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3070ms
rtt min/avg/max/mdev = 0.251/0.295/0.335/0.034 ms

[mstevens mercury mstevens]$ xhost +earth
earth being added to access control list

[mstevens mercury mstevens]$ rsh earth "export DISPLAY=$DISPLAY;
gcalctool"
earth: Connection refused









On Wed, 2004-01-28 at 08:12, Nathan Shaffer wrote:
> Sorry for the lag time in the response. With my real job schedule 
> crazier than this volunteer computer gig, Mondays tend to be a fiasco.
> 
> We built a static hardware connection between the two servers 
> (applications and labserver)  due to the fact that rsh is a VERY 
> non-secure connection unlike ssh, with no encryption to slow down the 
> process.  So with a 3rd nic card on our desktop server connected with a 
> crossover cable to the applications server, we built  a 2 ip class c 
> static network  between the two servers.  /etc/hosts was updated to 
> reflect the new connection.
> 
> My cohort in crime created a wrapper script in /usr/local/bin to run 
> applications remotely which looks something like this:
> 
> 	#!/bin/bash
> 	# wrapper script to run mozilla remotely from appserver
> 
> 	xhost +appserver
> 	rsh appserver "export DISPLAY=$DISPLAY; mozilla"
> 
> This allows the program to run on the server +appserver with the second 
> line setting up the display and exporting it to the desktop server.  
> With this running OpenOffice, Mozilla and other things, we've managed 
> to successfully balance the load of the two servers and response times 
> for everything  is vastly improved. The appserver's (applications) 2nd 
> nic card is connected to the rest of the network for other services.  
> With 30 students logged in using OO1.1, I've never seen either servers' 
> load average over 1.2 where before just running 25 students on 1 dual 
> 733 server would get nasty.  We were seeing loads averages as high as 
> 12.0 with lots of swap being used.  Neither server touches swap now.  
> /home/users is mounted on a third server running all the ldap stuff.
> 
> Hope this helps.
> 
> Nathan Shaffer
> St. John the Apostle School
> Oregon City, OR
> nathan grandvache com
> 
> 
> _______________________________________________
> K12OSN mailing list
> K12OSN redhat com
> https://www.redhat.com/mailman/listinfo/k12osn
> For more info see <http://www.k12os.org>