| DOT User's Guide |
Version 1.0alpha |
Released 12/17/1998 |
Users of networks of workstations (MPICH users) need to make sure they can connect to all the computers they intend to use via the remote shell program, rsh.
Warning: Using an rhosts file creates a security problem. If someone manages to break in to your account on sgi1, they automatically gain access to alpha1 as well! Please be sure you are not violating any local policies before following these directions.
Suppose, for example, you wish to run DOT with host sgi1 as the master and host alpha1 as a worker. Assuming that
the following example shows how to test remote shells and configure for them if required.
% rlogin sgi1 -l harpo % rsh alpha1 uname -a OSF1 alpha1 V4.0 564 alpha
If you get a "Permission denied" or "Connection refused" error, you will have to configure a rhosts file. create an rhosts file as shown below.
rlogin alpha1 -l marx echo 'sgi1 harpo' >>! $HOME/.rhosts chmod 600 $HOME/.rhosts logout
Test the rsh command from sgi1 again. If it fails, then contact your system administrator for help.
Be sure to test all the workstations you wish to use. If you stop using sgi1 as your master computer, then you will have to reconfigure your rhosts file to allow remote shells from the new master in addition to shells from sgi1.