MongoDB monitoring errors

[stecino]

Hi all, I am running into issues on some of my MongoDB monitors. (stageutil01 is my Nagios server)

Here is what I have:

define command {
command_name check_mongodb
command_line $USER1$/check_mongodb.py -H $HOSTADDRESS$ -A $ARG1$ -P $ARG2$ -W $ARG3$ -C $ARG4$
}

These services don't work'

define service {
use generic-service
hostgroup_name stage_mongo,prod_mongo_8083
service_description Mongo_Free_Connections_8083
check_command check_mongodb!connections!8083!70!80
}


define service {
use generic-service
hostgroup_name stage_mongo,prod_mongo_8083
service_description Mongo_Memory_Usage_8083
check_command check_mongodb!memory!8083!cds!mongo2013p!20!28
}

[root@stageutil01 libexec]# ./check_mongodb.py -H stagedb03 -A memory -P 8083 -u cds -p mongo2013p
CRITICAL - General MongoDB Error: command SON([('authenticate', 1), ('user', u'cds'), ('nonce', u'd9ff7ee0be88d9d8'), ('key', u'd74ef08e18a6d533335be236456035aa')]) failed: auth fails

[root@stageutil01 libexec]# ./check_mongodb.py -H stagedb03 -A connections -P 8083 -u cds -p mongo2013p
CRITICAL - General MongoDB Error: command SON([('authenticate', 1), ('user', u'cds'), ('nonce', u'f24ca43bec7e05dd'), ('key', u'f72e9a2bccf05ee7ed113bade42f762b')]) failed: auth fails

These services work

# Check Replication Lag
define service {
use generic-service
hostgroup_name stage_mongo,prod_mongo_8083
service_description Mongo_Replication_Lag_8083
check_command check_mongodb!replication_lag!8083!15!30
}

# Check Replication Lag
define service {
use generic-service
hostgroup_name stage_mongo,prod_mongo_8083
service_description Mongo_Replication_Lag_Percentage_8083
check_command check_mongodb!replication_lag_percent!8083!50!75
}

[root@stageutil01 libexec]# ./check_mongodb.py -H stagedb03 -A replication_lag_percent -P 8083 -W 50
OK - Not running with replSet
[root@stageutil01 libexec]# ./check_mongodb.py -H stagedb03 -A connect -P 8083 -W 50
OK - Connection took 0 seconds


===========

For those services that fail, I'm assuming that I use DB user name/pwd and not server user/pwd combination.
I also tried to update my command definition to explicitly include user and password as arguments. But still didn't help

Thanks in advance

[slansing]

Have you given the plugin's documentation a read-through? I believe it shows exactly how you need to configure both ends:

https://github.com/mzupan/nagios-plugin-mongodb

[stecino]

THat's exactly what I used to setup my monitoring. Hence my question, why is it failing authentication for a few monitors, when none of them have user/password parameters specified in the command

[abrist]

Do you have any logs for the mongodb that you can check? Maybe auth is actually failing on the mongo server?

[stecino]

Looks like it can't find the cds user in the admin.system.users table

Thu Mar 28 14:57:47 [initandlisten] connection accepted from 10.198.4.29:33979 #139665 (118 connections now open)
Thu Mar 28 14:57:47 [conn139665] authenticate db: admin { authenticate: 1, user: "cds", nonce: "7ad14cc52f1255", key: "ae9d476cef5414cea8b0671986ae2bd5" }
Thu Mar 28 14:57:47 [conn139665] auth: couldn't find user cds, admin.system.users
Thu Mar 28 14:57:47 [conn139665] end connection 10.198.4.29:33979 (117 connections now open)

[stecino]

I was able to resolve the issue with superAdmin user credentials.

Plus in addition to that what I ended up doing was to setup check_mongodb_login where I explcitly define user and password

Thanks, everyone for you input