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Top Forums Shell Programming and Scripting Create a list of commands in a central location, and then run them all remotely through a ssh here Post 302455754 by DeCoTwc on Wednesday 22nd of September 2010 10:51:19 AM
Old 09-22-2010
Create a list of commands in a central location, and then run them all remotely through a ssh here

I'm trying to write a script that in the end will from one central location hop to a bunch of servers and then run a series of ping tests. The thing is, the list of devices that needs to be pinged is going to be different for each server. So what I want to do is be able to do is read through the list of servers at the central location, set up the logic to figure out what machines it needs to ping, and then execute a single ssh session with a here statement. The issue I have is, I'm not sure how to create a list of commands, and then run through them.

So what I have right now is:

Code:
#!/bin/bash

head -1 blade | while read i; do
    i=($i)
    case "${i%b*}" in
        r01)
                        #LOGIC TO DETERMINE WHAT SERVERS NEED TO BE PINGED GOES HERE
            ssh -T r01b01  <<EOF
                        #ACTUAL COMMANDS GO HERE INSTEAD OF SINGLE PING COMMAND BELOW
ping -q -c 1 -w 1 10.250.19.5 > /dev/null && echo "success" || echo "failed"
EOF
        ;;
        esac
    done

Doing the logic is fine, I can hack my way through that. What I can't figure out is how to pass a list of commands based on that logic through a single ssh connection.

Any ideas?
 

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bup-on(1)						      General Commands Manual							 bup-on(1)

NAME
bup-on - run a bup server locally and client remotely SYNOPSIS
bup on <hostname> index ... bup on <hostname> save ... bup on <hostname> split ... DESCRIPTION
bup on runs the given bup command on the given host using ssh. It runs a bup server on the local machine, so that commands like bup save on the remote machine can back up to the local machine. (You don't need to provide a --remote option to bup save in order for this to work.) See bup-index(1), bup-save(1), and so on for details of how each subcommand works. This 'reverse mode' operation is useful when the machine being backed up isn't supposed to be able to ssh into the backup server. For example, your backup server can be hidden behind a one-way firewall on a private or dynamic IP address; using an ssh key, it can be autho- rized to ssh into each of your important machines. After connecting to each destination machine, it initiates a backup, receiving the resulting data and storing in its local repository. For example, if you run several virtual private Linux machines on a remote hosting provider, you could back them up to a local (much less expensive) computer in your basement. EXAMPLES
# First index the files on the remote server $ bup on myserver index -vux /etc bup server: reading from stdin. Indexing: 2465, done. bup: merging indexes (186668/186668), done. bup server: done # Now save the files from the remote server to the # local $BUP_DIR $ bup on myserver save -n myserver-backup /etc bup server: reading from stdin. bup server: command: 'list-indexes' PackIdxList: using 7 indexes. Saving: 100.00% (241/241k, 648/648 files), done. bup server: received 55 objects. Indexing objects: 100% (55/55), done. bup server: command: 'quit' bup server: done # Now we can look at the resulting repo on the local # machine $ bup ftp 'cat /myserver-backup/latest/etc/passwd' root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/bin/sh bin:x:2:2:bin:/bin:/bin/sh sys:x:3:3:sys:/dev:/bin/sh sync:x:4:65534:sync:/bin:/bin/sync ... SEE ALSO
bup-index(1), bup-save(1), bup-split(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-on(1)
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