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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-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine and append the indicated identity file to that machine's ~/.ssh/autho- rized_keys file. If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary.) NOTES
This program does not modify the permissions of any pre-existing files or directories. Therefore, if the remote sshd has StrictModes set in its configuration, then the user's home, ~/.ssh folder, and ~/.ssh/authorized_keys file may need to have group writability disabled manu- ally, e.g. via chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys on the remote machine. SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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