> From: xiao ren [mailto:[EMAIL PROTECTED]
> Sent: Thursday, October 23, 2008 2:16 AM
> net-snmp agent can be extended by using NET-SNMP-EXTEND-MIB
> and adding external shell scripts, but there might exist a
> problem, that is, if a script which is called by agent
> includes a long-run operation,(say, 1 or 2 minutes), how to
> avoid the agent to ignore the subsequent snmp requests in the
> mean time? I hope net-snmp agent has a mechanics to solve
> this problem, has it? Thanks!
I do not believe there is any mechanism intrinsic to the agent to do
this. Instead, you should extend the agent with a couple of scripts:
1) Reads the value of the result from a file, initialized to some
"reasonable" value. This object can be public.
2) Starts the script running in the background and returns
immediately. The script writes a "start time" and "stop time", each to its own
file. The script will not be started if the current "start time" is greater
(more recent) than the current "stop time". This object should be restriced.
3) Forces the script to run regardless of "start time" or "stop time".
This is recovery from script crash and should be highly restricted.
Advanced maneuvers:
4) Two objects can return the values of "start time" and "stop time"
so that an application can tell if the script is currently running (or may have
crashed).
5) Add a "max interval" object. In object (1), if the difference
between the current time and "stop time" is greater than "max interval", start
the script.
6) A mutex for the script.
I leave the rest to your imagination. This type of active management
is typical of SNMP, and once you get comfortable with it, has a lot of
advantages.
HTH,
Mike
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