Nagios Plugins

Macros
Commands
Services
Hosts
Hostgroups!
Examples
Plugin API
NRPE

Why?

Alerting

Community

Simplicity

Robust

Modular

How?

Macros

(Variables)

User defined
Host address
Arguments

Order of Operations

Execute command
Run check
Report result

Commands

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

Hosts

define host {
    use         linux-server
    host_name   prd-om-db11.eth1
    alias       prd-om-db11
    hostgroups  mongo_hosts, prd_om_cluster
}

Hostgroups

define hostgroup {
    hostgroup_name      mongo_hosts
    alias               Mongo Hosts
}

define hostgroup {
    hostgroup_name      prd_om_cluster
    alias               Production OM Cluster
}

define hostgroup {
    hostgroup_name      all_hosts
    alias               All OrderGroove Hosts
    hostgroup_members   apache_hosts,mysql_hosts,mongo_hosts,redis_hosts
}

Services

define service {
    use                     generic-service
    hostgroup_name          mongo_hosts
    service_description     Mongo Free Connections
    check_command           check_mongodb!connections!70!80
}

define service {
    use                     generic-service
    hostgroup_name          prd_om_cluster
    service_description     Check cloud_log Collection State
    check_command           check_mongodb_collection!collection_state!mongog!cloud_log
}

Examples

check_tcp
check_http
check_snmp
check_mysql_health
check_mongodb.py
check_redis.pl
check_mariadb_slave.py

Plugin API

0 = OK
1 = WARNING
2 = CRITICAL
3 = UNKNOWN

NRPE

Remote execution is cool but...

There's more...

Scheduling
Alerting
"Perfdata"

References

https://www.nagios.org/documentation

http://nagios.sourceforge.net/docs/3_0/pluginapi.html