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Require Perl script to get system load and uptime on remote UNIX hosts

Posted on 2010-08-13
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Last Modified: 2013-12-27
I need help in executing the uptime on remote unix servers mainly linux and solaris as well as sun containers. I am able to get the uptime on local system but when I execute the code with arguments  I am unable to get the logic right. I need to pass arguments with perl script which i have to integrate with a monitoring tool to set the threshold.


#!/usr/bin/perl -w

 # my $MYHOME=$ENV($MYHOME);
 # $MYHOME="/home/anil" if (not $MYHOME);
 open(LOG, ">/tmp/uptime.pl.log") or die "Can't open file: $!";
 my $ScriptDir="/home/anil";
 print LOG  "Arg1=$ARGV[0], Arg2=$ARGV[1], Arg3=$ARGV[2], Arg4=$ARGV[3]\n";

 exit if not ($ARGV[0] eq "-stat" || $ARGV[0] eq "-config");

  my $ip=$ARGV[3];
  exit 1 if (not $ip);
  
  my $user="root";
  $user=$ARGV[4] if ($ARGV[4]);
  #my @result;
  my $keyfile="/root/.ssh/id_rsa";
	sub query {
	open (RESULT, "ssh 2>/dev/null -l $user -i $keyfile -oStrictHostKeyChecking=no -oBatchMode=yes $ip $cmd |") || die "can't connect to $ip";
	@result = <RESULT>;
	close RESULT;
}       
	$os = `uname -s`;

 	if ($os =~ /Linux/)
 {	
     $uptime=`ps -eo pid,comm,etime | grep init`;
 }
 else 
 {
     $uptime=`ps -p 1 -o etime | tail -1`;
 }

 if ($uptime =~ /[0-9]+\-/) 
 {
     ($Days, $Hours, $Minutes, $Seconds) = $uptime =~ /([0-9]*)\-?([0-9]+):([0-9]+):([0-9]+)/;
 } 
 elsif  
     ($uptime =~ /[0-9]+:[0-9]+:[0-9]+/) 
 {
     ($Hours, $Minutes, $Seconds) = $uptime =~ /([0-9]+):([0-9]+):([0-9]+)/;
      $Days = 0;
 } 
 else 
 {
     ($Minutes, $Seconds) = $uptime =~ /([0-9]+):([0-9]+)/;
      $Days = 0;
      $Hours = 0;
 }
  query();
    for each $_ (@result) {
     $t_uptime = eval($Days*24*60 + $Hours*60 + $Minutes);
    } 
     print ("uptime: $t_uptime \n");

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Question by:amk2121
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Author Comment

by:amk2121
ID: 33434887
I require a solution to the above. I have the script which runs when the remote execution code from the perl script is removed.. I need to execute the script on a remote Unix server (Linux /Solaris) using ssh and secure RSA key to first get the uptime and convert the uptime into total minutes.

Please let me know if you require more information
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LVL 28

Expert Comment

by:Jan Springer
ID: 33436486
Please give an example of some arguments.  If I'm understanding the question properly, you may need to "shift" in the beginning of your script.
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Author Comment

by:amk2121
ID: 33439250
the script will remotely log into a target server and report the following data by printing it to stdout

Response Time=NNN  (in seconds)
Uptime=NNN  (in minutes)
System Load=NN.mm (float number)
AVAILABILITY=   (0 or 100)

The script will have input argument specifying desired timeout in seconds
If operation can not be completed in that time then AVAILABILITY reported should be set to 0
The script must finish after TimeOut seconds and should not be hanging around waiting for connection (hint: use timeout parameter to ssh command).


The script will be called with these arguments:

ScriptName Arg1 Arg2 TimeOut TargetServer UserName
 
You can ignore Arg1 and Arg2 but they will be there!
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LVL 10

Expert Comment

by:APNFSSC
ID: 33460183
have a look at Net::SSH to run the remote commands... also I'm not sure if this is true on all nix systems but /proc/uptime contains the uptime in seconds if that is any help.

Also have a look at Getopt::Long to help with handling the arguments that your passing through.

As for the timeout I'm not sure how you can handle that... i think the ssh will just time out by itself if it cannot connect.
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LVL 3

Expert Comment

by:ckhsu1977
ID: 33490535
a bit curious about your script.
Regardless of what user you set $user, you'll still use /root/.ssh/id_rsa as the private key. Seems odd.
How are you passing and what commands are you passing for $cmd in the subroutine query?
0
 

Author Comment

by:amk2121
ID: 33518340
I got the script working and yes there was a wrong logic expressed in my code snippet above.

Thanks for all your support
0
 
LVL 10

Expert Comment

by:APNFSSC
ID: 33518455
What did you end out altering that made it work?
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Accepted Solution

by:
amk2121 earned 0 total points
ID: 33541096
I changed the script and used a logic pertaining to my requirement.

$user = "root";
$ips=$ARGV[0];                    ## this holds the command needs to run on remote host.
@ipary= split(/\,/,$ips);       ## split if there are more then one host
for $ipary(@ipary){

print ("\n");
print "connecting ......$ipary \n";
$CMD="ps -eo pid,comm,etime | grep init > xyz.dat";
$IDENT="/root/.ssh/id_rsa";
system("ssh $user\@$ipary -i $IDENT -o ConnectTimeout=$ARGV[1]  $CMD");    ## execute ssh command
$uptime=`cat xyz.dat | tail -1`;
0
 

Author Comment

by:amk2121
ID: 34497438
all went well and my script works good
0
 

Author Closing Comment

by:amk2121
ID: 34860165
I got help from others and made changes to the script which ultimately worked
0

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