ActiveXperts Network Monitor
Monitor servers, workstations, devices and applications in your network

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Using Shell Scripts to monitor Linux and Unix computers with ActiveXperts Network Monitor

Introduction

ActiveXperts Network Monitor ships with a collection of shell scripts to monitor remote Linux- and Unix computers. There are two types of check for that: an RSH check and an SSH check.

SSH allows secure network services over an insecure network, such as the Internet. With SSH, ActiveXperts Network Monitor can login onto a remote machine running the SSH daemon, and execute a command or shell script. RSH is another IP-based protocol to execute programs on a remote Linux/Unix computer, but it less popular because it is NOT secure. Therefore, SSH is recommended for checking remote Linux- and Unix computers.

ActiveXperts Network Monitor requires the output (i.e. StdOut) to be formatted according to the following syntax:

[ SUCCESS | ERROR | UNCERTAIN]: { <explanation> } { DATA:<value>}

The <explanation> will be shown in the 'Last Response' column in the Manager application. The <value> field will be shown in the 'Data' column in the Manager application.

The shell script must reside on the Linux machine, i.e. you cannot use a script that resides on the Windows monitoring server. The shell script must have the 'Execute' permission flag set.

Here's a sample shell script that works with Network Monitor. This script checks the size of a directory: 

#!/bin/sh
# Validate number of arguments
if [ $# -ne 2 ] ; then
  echo "UNCERTAIN: Invalid number of arguments - Usage: directory_size  "
  exit 1
fi
# Check the size of the directory specified
if [ -d "$1" ]; then
  SIZE=`du -s "$1" | awk '{ print $1; }'`
  if [ $SIZE -le $2 ] ; then
	  echo "SUCCESS: Size of directory=[$SIZE KB], maximum allowed=[$2 KB] DATA:$SIZE"
  else
	  echo "ERROR: Size of directory=[$SIZE KB], maximum allowed=[$2 KB] DATA:$SIZE"
  fi
else
  echo "UNCERTAIN: $1 is not a directory"
fi

Network Monitor Shell Script checks

ActiveXperts Network Monitor ships with a selection of shell scripts. These scripts work out of the box. The scripts are located in the <installation-dir>\Scripts\Monitor (Linux) (e.g., C:\Program Files\ActiveXperts\Network Monitor\Scripts\Monitor (Linux). you must copy the script to the linux machine first in order to run the script.

Samples

CPU usage check

Click here for a CPU monitoring script.

Directory size check

Click here for a directory size.

Disk check

Click here for a disk check.

File existence check

Click here for a file existence check.

Memory usage check

Click here for a memory monitoring script.

Ping check

Click here for a ping check.

Pop3 check

Click here for a POP3 check.

Process check

Click here for a process check.

Smtp check

Click here for an SMTP check.