Re: Retrieving page fault events trough SNMP protocol...

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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