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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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The mkdir command will create a new directory even if the user does not have the required permissions to write to the parent directory of the new directory.
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HEARTBEAT(8)						  System administration utilitie					      HEARTBEAT(8)

NAME
heartbeat - Heartbeat subsystem for High-Availability Linux DESCRIPTION
heartbeat is a basic heartbeat subsystem for Linux-HA. It will run scripts at initialisation, and when machines go up or down. This version will also perform IP address takeover using gratuitous ARPs. It works correctly for a 2-node configuration, and is extensible to larger configurations. It implements the following kinds of heartbeats: o UDP/IP broadcast; o UDP/IP multicast; o UDP/IP unicast; o Bidirectional Serial Rings ("raw" serial ports) -- this type is deprecated and should no longer be used; o special "ping" heartbeats for routers, etc. -- this type has been superseded by functionality in pacemaker() and should no longer be used. Comprehensive documentation on heartbeat is available in the Heartbeat User's Guide. If this documentation is not installed on your system, it can be found at http://linux-ha.org/. OPTIONS
The following options are supported by heartbeat: -d Increment debugging level. Higher levels are more verbose. -r Reload heartbeat. This option is functionally identical to sending a running heartbeat process a HUP signal. If the configuration has not changed, then this option is essentially a no-op. If ha.cf(5) or authkeys(5) has changed, then heartbeat will re-read these files and update its configuration. This option may not be used together with -R. -k Kill (stop) heartbeat. -s Report heartbeat status. -R Heartbeat restart exec flag (internal use only). May not be used with -r. -C Heartbeat current resource state for restart (internal use only). Only valid with -R. -V Print out heartbeat version. Note that most of these options are used for supporting the heartbeat init script, which provides the conventional start, stop, status and restart options (among others). It is recommended to use this rather than invoking the heartbeat command directly. SEE ALSO
ha.cf(5), authkeys(5) AUTHORS
Alan Robertson <alanr@unix.sh> heartbeat Juan Pedro Paredes Caballero <juampe@retemail.es> man page Simon Horman <horms@verge.net.au> man page Florian Haas <florian.haas@linbit.com> man page Heartbeat 3.0.5 24 Nov 2009 HEARTBEAT(8)

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