Using Linux Shell Script with ActiveXperts Network Monitor

    Introduction
    Network Monitor SSH checks
    Samples
    SSH vs. RSH

Introduction

SSH Secure Shell 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. 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 SSH 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

Click here for a CPU monitoring script.

Memory usage

Click here for a memory monitoring script.