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Monitor Linux hosts using SSH and ActiveXperts

Linux RSH
    Figure 1: ActiveXperts Network Monitor SSH check - Download ActiveXperts Network Monitor now »


ActiveXperts solution to monitor Linux hosts

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. Samples:

ERROR: Free Disk space is less than 40 GB DATA:34
SUCCESS: Daemon 'LPD' is running

To allow clients (incl. ActiveXperts Network Monitor) to run a shell script on LINUX/UNIX machine using RSH, the following pre-conditions must be met:

  • The remote UNIX/LINUX machine must have the SSH daemon running;
  • The client must have an entry in the host.allowed configuration file.

An SSH Shell Script check requires the following parameters:

  • Remote Host - Host name or IP address of the remote LINUX/UNIX host;
  • Port - TCP port used for RSH on the remote host. Default port is 22;
  • SSH Command - Specifies the command to run on the remote host;
  • Script Timeout - Specifies the maximum number of milliseconds to wait for completion of the script; if the script takes longer, it will be terminated. Default value: 5000 milliseconds;
  • Account - Account used to authenticate to the remote host;
  • Password - Password used to authenticate to the remote host. If you use a Private Key File to authenticate, you can leave the 'Password' field blank;
  • Private Key File - Private Key File used to authenticate to the remote host. If you use a Password file to authenticate, you can leave the 'Private Key File' field blank;
  • If StdErr is not empty, the result will be - If there's an error in the script, you can handle this error and specify what the result of the check should be: Uncertain, Error or Success.

SSH