Retrieving page fault events trough SNMP protocol...

Hello,

Installing a monitoring solution, I'm trying to retrieve the number of
page faults occuring on a Linux based machine.
Do you think it's possible to do this using SNMP ?

Thanks.

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2008/5/29 bob <jav_poliarniy@club-internet.fr>:
> Installing a monitoring solution, I'm trying to retrieve the number of
> page faults occuring on a Linux based machine.
> Do you think it's possible to do this using SNMP ?

If you can find a way of retrieving this information from the kernel,
then yes - it should be possible to monitor this using SNMP.

Dave

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Hi,

Here is a short script I wrote that is called using the old style of
Net-SNMP oid/script extension that calls vmstat, takes a few samples,
then returns the numbers in a style that is Cacti-compatible. Should
be easy to make this work for page faults if you don't want to do a
real sub-agent / MIB extension.

I am including a little shell library I use with the script. Again,
this is not an optimal way to do this, but is an easy way if you are
not concerned about a script being forked every few minutes on the
client system.

Hope you don't find this example too strange / hard to understand to be useful.

-= Max

What the configuration to call a script looks like in snmpd.conf:

exec 1.3.6.1.4.1.YOUR.OID.HERE s22-vmstat.sh /usr/local/bin/s22-vmstat.sh

esf-lib.sh:

#!/bin/bash

glob_count() {

local pat="$1"

perl -e 'BEGIN{$t=0};$t++ for glob("'"$pat"'");END{print $t}'

return 0;

}

output_oid_conf() {

local script="$1"
local oid="$2"
local name=$(basename $script)

echo exec $oid $name $script

return 0;

}

and the script:

s22-vmstat.sh:

#!/bin/bash

.. ./esf-lib.sh || exit 1

if [ "$1" == "--snmp-conf" ]
then
output_oid_conf /usr/local/bin/s22-vmstat.sh 1.3.6.1.4.1.YOUR.OID.HERE
..22
exit 0
fi

vmstat 2 4 | awk '
{ line++; }
line > 3 {

r += $1;
b += $2;
si += $7;
so += $8;
io += $(NF);

} END {

printf("r:%d b:%d si:%d so:%d io:%d",
int(r/3), int(b/3), int(si/3), int(so/3), int(io/3));
}'

exit 0

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