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Full Discussion: Running a function on a remote server via SSH in a script
Top Forums Shell Programming and Scripting Running a function on a remote server via SSH in a script Post 302376178 by DeCoTwc on Monday 30th of November 2009 11:19:31 PM
Old 12-01-2009
Running a function on a remote server via SSH in a script
I'm working on a script (mostly for practice) to simplify a task I have to do every now and then. I have a cluster with 6 servers on it, each server has a directory with a set of files called *.pid and *.mpid. Each file contains the pid of a process that may or may not be running on that server. I'm trying to create a script that will hop to each server, collect what pid/mpid files there are, and then check to see if that process is actually running or not.

I've gotten it running using a pretty simple (albeit ugly) one liner:

Code:
 for i in 1 2 3 4 5 6 ;do echo "SYS0$i"; ssh sys0$i 'for i in `ls /usr/local/isa/run/`;do x=$(ps -ef|grep `cat /usr/local/isa/run/$i`|grep -v grep);if [[ $x = "" ]];then echo "$i is not running";else echo "$i is running";fi;done';done
SYS01
SYS02
BmsUI.mpid is running
BmsUI.pid is running
CORBAnameservice.mpid is running
CORBAnameservice.pid is running
CORBAnotificationservice.mpid is running
CORBAnotificationservice.pid is running
SYS03
ServiceGateway.mpid is running
ServiceGateway.pid is running
ETC

However, I'd like to be able to create a prettier looking script to do the same thing. I thought for neatness sake I could just put all of the logic in a function at the beginning of the script and then ssh to each server and call on the function, but that doesn't seem to work.

Code:
root@bms-nycnm-srv02:/root/procCheck# cat procCheck
#!/bin/bash
check ()
{
for file in `ls /usr/local/isa/run`
do
proc=$(ps -ef|grep `cat /usr/local/isa/run/$file`|grep -v grep)
if [[ $proc = "" ]];then
echo "$file has a pid/mpid file, but is not running"
else
echo "$file is running"
fi
done
}
for i in 1 2 3 4 5 6
do
echo "SYS0$i"
ssh sys0$i 'check'
done

I assume the issue is that once the script jumps to a new server and starts a subshell, it forgets about what ever functions I've declared in the first place. Any help or advice I'd appreciate it.
 

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LEARN ABOUT DEBIAN

molly-guard

MOLLY-GUARD(8)							  [FIXME: manual]						    MOLLY-GUARD(8)

NAME

       molly-guard - guard against accidental shutdowns/reboots

SYNOPSIS

       shutdown [-hV] [--molly-guard-do-nothing] [-- script_options]

       halt [-hV] [--molly-guard-do-nothing] [-- script_options]

       reboot [-hV] [--molly-guard-do-nothing] [-- script_options]

       poweroff [-hV] [--molly-guard-do-nothing] [-- script_options]

DESCRIPTION

       molly-guard attempts to prevent you from accidentally shutting down or rebooting machines. It does this by injecting a couple of checks
       before the existing commands: halt, reboot, shutdown, and poweroff. This happens via scripts with the same names in /usr/sbin, so it only
       works if you have /usr/sbin before /sbin in your PATH!

       Before molly-guard invokes the real command, all scripts in /etc/molly-guard/run.d/ have to run and exit successfully; else, it aborts the
       command.  run-parts(1) is used to process the directory.

       molly-guard passes any script_options to the scripts, and also populates the environment with the following variables:

       o   MOLLYGUARD_CMD - the actual command invoked by the user.

       o   MOLLYGUARD_DO_NOTHING - set to 1 if this is a demo-run.

       o   MOLLYGUARD_SETTINGS - the path to a shell script snippet which scripts can source to obtain settings.

       molly-guard prints the contents of /etc/molly-guard/messages.d/COMMAND or /etc/molly-guard/messages.d/default to the console, if either
       exists. This is due to /etc/molly-guard/run.d/10-print-message.

GUARDING SSH SESSIONS

       molly-guard was primarily designed to shield SSH connections. This functionality (which should arguably be provided by the openssh-server
       package) is implemented in /etc/molly-guard/run.d/30-query-hostname.

       This script first tests whether the command is being executed from a tty which has been created by sshd. It also checks whether the
       variable SSH_CONNECTION is defined. If any of these tests are successful, test script queries the user for the machine's hostname, which
       should be sufficient to prevent the user from doing something by accident.

       You can pass the --pretend-ssh script option to molly-guard to pretend that those tests succeeds. Alternatively, setting
       ALWAYS_QUERY_HOSTNAME in /etc/molly-guard/rc causes the script to always query.

       The following situations are still UNGUARDED. If you can think of ways to protect against those, please let me know!

       o   running sudo within screen or screen within sudo; sudo eats the SSH_CONNECTION variable, and screen creates a new pty.

       o   executing those command in a remote terminal window, that is a XTerm started on a remote machine but displaying on the local X server.

       You have been warned. You can use the --molly-guard-do-nothing switch to prevent anything from happening, e.g.  halt
       --molly-guard-do-nothing.

OPTIONS

       --molly-guard-do-nothing
	   Cause molly-guard to print the command which would be executed, after processing all scripts, instead of executing it.

       -h, --help
	   Display usage information.

       -V, --version
	   Display version information.

SEE ALSO

       shutdown(8), halt(1), reboot(8), poweroff(8).

LEGALESE

       molly-guard is copyright by martin f. krafft. Andrew Ruthven came up with the idea of using the scripts directory and submitted a patch,
       which I modified a bit.

       This manual page was written by martin f. krafft madduck@madduck.net.

       Permission is granted to copy, distribute and/or modify this document under the terms of the Artistic License 2.0

COPYRIGHT

       Copyright (C) 2008 martin f. krafft

[FIXME: source] 						   Apr 19, 2008 						    MOLLY-GUARD(8)
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