checking the heartbeat of the online user


 
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Old 10-11-2002
Question checking the heartbeat of the online user

hello,
Can anyone please tell me how can i check the availability of the online user in a client-server environtment.
This is for a program where lakhs of client are connected to the server and the server has to check the availability of the every client in every minute.
So polling every client is not a good option.
Can anyone help me for the solution.
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APPHBD(8)						  System administration utilitie						 APPHBD(8)

NAME
apphbd - Application Heartbeat Monitor for High-Availability Linux SYNOPSIS
apphbd [-srkdh] [-c file] DESCRIPTION
Warning apphbd is deprecated; its use is strongly discouraged. The functionality provided by apphbd has been replaced by resource-level monitoring in Pacemaker. /usr/lib/heartbeat/apphbd is a basic application heartbeat monitor daemon for Linux-HA. A group of Application Heartbeat APIs are defined for this heartbeat monitoring service. Applications may register with the daemon in order to be monitored. If an application fails to send a heartbeat within the specified interval, the daemon will log an event. apphbd may use a watchdog timer to monitor itself. apphbd extends its functionality by using plugins. A plugin, recmgr notifies the recovery manager daemon if certain events occur (e.g. an application fails to heartbeat). The Recovery Manager daemon (/usr/lib/heartbeat/recoverymgrd) receives notification from the recmgr plugin, then it tries to execute recovery scripts as configured. See the recoverymgrd default configuration file, recoverymgrd.conf for details. recoverymgrd registers itself with apphbd as a client application. apphbd should be started first with the recmgr plugin loaded. Then, recoverymgrd should be configured and started OPTIONS
The following options are supported: -s Show the status of apphbd, running or stopped. -k Stop (kill) the daemon. -r Restart the daemon. apphbd will reload its configuration file when restarted. -d level Set the debug level. -h Show a brief usage message. -c file Set an alternate configuration file. The default configuration file is ./apphbd.cf. For details on the file format and supported options, refer to the example apphbd.cf file found in the documentation directory. FILES
o /var/run/apphbd.pid - default PID file o apphbd.cf - Default configuration file for apphbd. apphbd searches the file in its working directory. o recoverymgrd.conf - default configuration file for recoverymgrd. recoverymgrd searches the file in its working directory. An alternative configuration file may be specified on the command line. o /usr/lib/heartbeat/plugins/AppHBNotification - directory containing plugins for apphbd. SEE ALSO
heartbeat(8) AUTHORS
Alan Robertson <alanr@unix.sh> apphbd Andrea Brugger <andrea.l.brugger@intel.com> man page Florian Haas <florian.haas@linbit.com> man page Heartbeat 3.0.5 November 26, 2009 APPHBD(8)