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Full Discussion: Notification if server unreachable?
Top Forums UNIX for Dummies Questions & Answers Notification if server unreachable? Post 302173149 by Smiling Dragon on Wednesday 5th of March 2008 07:03:21 PM
Old 03-05-2008
Java
It sort of depends what you want to use to alert, how many alerts you will tollerate in the event of a problem, and how vital it is that you get the alert.

Having each server watch the other 4 will mean that it's very likely you will hear about it if one of them fails, but you will get 4 messages about one machine. If you have a network interruption, you might get 20 messages as each server tells you the other 4 are dead. This can get quite bad if you plan to scale this up.

Having just one server watch the other 4 means that if that one server fails, you won't know. Further more, if it fails then another goes, you won't hear about that either. On the up-side, if one server fails, you only get one message. If the network fails, you only get 4 messages.

You can pick something halfway between (eg have two server watch everything else, or have two servers watch each other and 1 or 2 other servers) to find the balance you need.

A quick framework of what you'd probably want to run:
Code:
#!/bin/sh
while true
do
  for host in $HOSTLIST
  do
    if ping $host
    then
      echo "`date` $host ok" >> log
    else
      echo "`date` $host NOT OK" >> log
      echo "Hi, `hostname` here to tell you that its all gone Pete Tong on $host" | mail_prog_of_your_choice
      echo "`hostname` says: $host has left the building" | your_favourite_pager_or_sms_gateway
      /cool/noises/play_alarming_sounds aaawuuuuga.au
    fi
  done
  sleep $INTERVAL
done

 

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LEARN ABOUT SUNOS

asadmin-jms-ping

asadmin-jms-ping(1AS)						   User Commands					     asadmin-jms-ping(1AS)

NAME

       jms-ping  - checks to see if the JMS provider is up and running

SYNOPSIS

       jms-ping   --user  admin_user  [--password  admin_password]  [--host  localhost]  [--port  4848]  [--passwordfile  filename]  [--secure|-s]
       [--terse=false] [--echo=false] [--interactive=false]

       Checks to see if the JMS provider is up and running. This command is supported in remote mode only.

OPTIONS

       --user		       authorized domain application server administrative username.

       --password	       password to administer the domain application server.

       --host		       machine name where the domain application server is running.

       --port		       port number of the domain application server listening for administration requests.

       --passwordfile	       file containing the domain application server password.

       --secure 	       if true, uses SSL/TLS to communicate with the domain application server.

       --terse		       indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well-
			       formatted data for consumption by a script. Default is false.

       --echo		       setting to true will echo the command line statement on the standard output. Default is false.

       --interactive	       if set to true (default), only the required password options are prompted.

       Example 1: Using jms-ping

       asadmin> jms-ping --user admin --password adminadmin --host bluestar --port 4848 server1
       JMS Ping Status=RUNNING

EXIT STATUS

       0		       command executed successfully

       1		       error in executing the command

       asadmin-create-jmsdest(1AS), asadmin-delete-jmsdest(1AS), asadmin-list-jmsdest(1AS)

J2EE 1.4 SDK							    March 2004						     asadmin-jms-ping(1AS)
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