generate_mongodb_mrpe

#!/bin/bash

## This shell script generates lines suitable to be added to mrpe.cfg
## Because there may be existing checks in mrpe.cfg, this script doesn't overwrite mrpe.cfg
## Set the MONGO_ADDRESS variable with the target hostname (must match rs.status()
## for replication checks to work), run the script, then add the content to mrpe.cfg
## Also chmod 600 /etc/check_mk/mrpe.cfg to keep the password hidden from nonroot users
## For single node instances, don't use the applicable lines in mrpe.cfg
##
## You can use the 'oplog' check if you use a locally modified check_mongodb.py

# for creds; default location for root user
MONGO_AUTH_FILE=/root/.mongorc.js
# this comes from https://github.com/mzupan/nagios-plugin-mongodb
NAGIOS_PLUGIN_SCRIPT=/root/nagios-plugin-mongodb/check_mongodb.py
#NAGIOS_PLUGIN_SCRIPT=/usr/local/lib64/nagios/plugins/check_mongodb.py

mongouser=$(grep db.auth $MONGO_AUTH_FILE |cut -f2 -d "'")
mongopass=$(grep db.auth $MONGO_AUTH_FILE |cut -f4 -d "'")

NAGIOS_OPTIONS="-u $mongouser -p $mongopass -H $MONGO_ADDRESS -D"

# memory_mapped needs to be able to specify params
# bash4 dictionary (aka associative array) not the most portable!
declare -A nagios_args=( ["memory_mapped"]="-W 1500 -C 2000" ["memory"]="-W 1500 -C 2000" ["replica_primary"]="-r kbrs0" ["connect"]="-W 10 -C 20" ["connect_primary"]="-W 10 -C 20" ["page_faults"]="-W 8000 -C 10000" ["oplog"]="-W 192 -C 24")

# replication_lag_percent is slow, let's leave it out
# add oplog if you have a working check_mongodb.py
for check in connect connections replication_lag memory memory_mapped flushing last_flush_time replset_state replica_primary connect_primary page_faults
do
    command="$NAGIOS_PLUGIN_SCRIPT $NAGIOS_OPTIONS -A $check ${nagios_args["$check"]}"
    echo "mongodb_$check (interval=300) $command"
done