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Top Forums UNIX for Dummies Questions & Answers Running commands on remote machines Post 302740687 by jim mcnamara on Thursday 6th of December 2012 03:11:47 PM
Old 12-06-2012
It all works the same. You have to have the SAME username on all 602 boxes, two monitoring boxes, 600 monitor-ees. Likewise everybody needs 602 home directories with an .ssh subdirectory, that has protections 600. The home directory for each has to be 755 or 751 or even 700. The perms cannot be 77[n].

You can also have a mishmash of usernames if you want, but keeping track and matching everything up is a nightmare.

The account on each remote box has to have perms to run your commands.

1. create ssh-keys on both servers, place the keys from each server on the remotes.
This is 1200 cp operations, assuming you have accounts and home directories and .ssh directories set up.

You likely already have infrastructure existing to do this - like an ftp server for everybody.

2. Run your monitoring script using ssh from one of the two monitor boxes.
Code:
ssh remotenodename 'mpstat; iostat -n'  >> /logs/remoteserver.log

Failover is up to you, if the two monitoring boxes are clustered that works.

Here is how to create your keys. The rsa.pub is the public key you send out everywhere
and place it in /home/user/.ssh/authorized_keys

ssh-keygen: password-less SSH login
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SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME
ssh-keysign -- ssh helper program for hostbased authentication SYNOPSIS
ssh-keysign DESCRIPTION
ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during hostbased authentication with SSH protocol version 2. ssh-keysign is disabled by default and can only be enabled in the the global client configuration file /etc/ssh/ssh_config by setting HostbasedAuthentication to ``yes''. ssh-keysign is not intended to be invoked by the user, but from ssh(1). See ssh(1) and sshd(8) for more information about hostbased authen- tication. FILES
/etc/ssh/ssh_config Controls whether ssh-keysign is enabled. /etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_rsa_key These files contain the private parts of the host keys used to generate the digital signature. They should be owned by root, read- able only by root, and not accessible to others. Since they are readable only by root, ssh-keysign must be set-uid root if hostbased authentication is used. SEE ALSO
ssh(1), ssh-keygen(1), ssh_config(5), sshd(8) AUTHORS
Markus Friedl <markus@openbsd.org> HISTORY
ssh-keysign first appeared in OpenBSD 3.2. BSD
May 24, 2002 BSD
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