[Beowulf] passwordless "rsh" login

[Tyler Simon]

Sandeep,

To set up a RedHat 8.0 cluster using a "passwordless" rsh I
always check the that I have the following.

For each child:

1.)In the users home directory make sure there exists a
'.rhosts' file containg a listing of child nodes and the
master node, set the permissions to 644.

masternode
node1
node2
node3

2.) Type 'setup' and from the 'System Services' menu make
sure that rsh, rlogin, and rexec are selected.

3.) Add the following lines to the end of the /etc/securetty
file

rsh
rexec
rlogin

4.) Change directory to /etc/pam.d and modify the rsh,
rlogin, and rexec files as follows. The order is very
important.

rsh file
#%PAM-1.0
# For root login to succeed here with pam_securetty, "rsh"
must be
# listed in /etc/securetty.
auth       required     /lib/security/pam_rhosts_auth.so
auth       required     /lib/security/pam_securetty.so
auth       required     /lib/security/pam_nologin.so
auth       required     /lib/security/pam_env.so
account    required     /lib/security/pam_stack.so
service=system-auth
session    required     /lib/security/pam_stack.so
service=system-auth

rlogin file
#%PAM-1.0
# For root login to succeed here with pam_securetty,
"rlogin" must be
# listed in /etc/securetty.
auth       sufficient   /lib/security/pam_rhosts_auth.so
auth       required     /lib/security/pam_securetty.so
auth       required     /lib/security/pam_nologin.so
auth       required     /lib/security/pam_env.so
auth       required     /lib/security/pam_stack.so
service=system-auth
account    required     /lib/security/pam_stack.so
service=system-auth
password   required     /lib/security/pam_stack.so
service=system-auth
session    required     /lib/security/pam_stack.so
service=system-auth
	
rexec file
#%PAM-1.0
# For root login to succeed here with pam_securetty, "rexec"
must be
# listed in /etc/securetty.
auth       required     /lib/security/pam_nologin.so
auth       required     /lib/security/pam_securetty.so
auth       required     /lib/security/pam_env.so
auth       required     /lib/security/pam_stack.so
service=system-auth
account    required     /lib/security/pam_stack.so
service=system-auth
session    required     /lib/security/pam_stack.so
service=system-auth

5.) Make sure to have an updated /etc/passwd,/etc/shadow and
/etc/group file on each node.

This should do it, and feel free to contact me if you have
any trouble.

-Tyler Simon

> Hi,
>
> I have a cluster set up with redhat 8.0 in which Fluent is
> being used. The /home of the master is being shared by all
> the nodes on the cluster. For running parallel
> applications with Fluent it requires passwordless "rsh"
> login to all the nodes. As a local user (non root) I am
> able to login from the master to all the nodes with rsh
> without password. But from one node to another it keeps
> asking for the password.
>
> Is there a solution to it?
>
> Thanks in advance.
>
> Sandy.
>
>
> Sandeep Krishnan
> Graduate Student
> Oklahoma State University
>
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