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README.md

nagios cookbook

Build Status

Installs and configures Nagios server. Chef nodes are automatically discovered using search, and Nagios host groups are created based on Chef roles and optionally environments as well.

Requirements

Chef

Chef version 0.10.10+ and Ohai 0.6.12+ are required.

Because of the heavy use of search, this recipe will not work with Chef Solo, as it cannot do any searches without a server.

This cookbook relies heavily on multiple data bags. See Data Bag below.

The system running the 'server' recipe should have a role named 'monitoring' so that NRPE clients can authorize monitoring from that system. This role name is configurable via an attribute. See Attributes below.

Platform

  • Debian 6.X, 7.X
  • Ubuntu 10.04, 12.04, 13.04
  • Red Hat Enterprise Linux (CentOS/Amazon/Scientific/Oracle) 5.X, 6.X

Notes: This cookbook has been tested on the listed platforms. It may work on other platforms with or without modification.

Cookbooks

  • apache2
  • build-essential
  • nginx
  • nginx_simplecgi
  • php
  • yum-epel (note: this requires yum cookbook v3.0, which breaks compatibility with many other cookbooks)

Attributes

default

The following attributes are used by both client and server recipes.

  • node['nagios']['user'] - Nagios user, default 'nagios'.
  • node['nagios']['group'] - Nagios group, default 'nagios'.
  • node['nagios']['plugin_dir'] - location where Nagios plugins go, default '/usr/lib/nagios/plugins'.
  • node['nagios']['multi_environment_monitoring'] - Chef server will monitor hosts in all environments, not just its own, default 'false'
  • node['nagios']['monitoring_interface'] - If set, will use the specified interface for all nagios monitoring network traffic. Defaults to nil

client

The functionality that was previously in the nagios::client recipe has been moved to its own NRPE cookbook at https://github.com/tas50/chef-nrpe

server

The following attributes are used for the Nagios server

  • node['nagios']['server']['install_method'] - whether to install from package or source. Default chosen by platform based on known packages available for Nagios: debian/ubuntu 'package', redhat/centos/fedora/scientific: source
  • node['nagios']['server']['service_name'] - name of the service used for Nagios, default chosen by platform, debian/ubuntu "nagios3", redhat family "nagios", all others, "nagios"
  • node['nagios']['home'] - Nagios main home directory, default "/usr/lib/nagios3"
  • node['nagios']['conf_dir'] - location where main Nagios config lives, default "/etc/nagios3"
  • node['nagios']['config_dir'] - location where included configuration files live, default "/etc/nagios3/conf.d"
  • node['nagios']['log_dir'] - location of Nagios logs, default "/var/log/nagios3"
  • node['nagios']['cache_dir'] - location of cached data, default "/var/cache/nagios3"
  • node['nagios']['state_dir'] - Nagios runtime state information, default "/var/lib/nagios3"
  • node['nagios']['run_dir'] - where pidfiles are stored, default "/var/run/nagios3"
  • node['nagios']['docroot'] - Nagios webui docroot, default "/usr/share/nagios3/htdocs"
  • node['nagios']['timezone'] - Nagios timezone, defaults to UTC
  • node['nagios']['enable_ssl] - boolean for whether Nagios web server should be https, default false
  • node['nagios']['ssl_cert_file'] = Location of SSL Certificate File. default "/etc/nagios3/certificates/nagios-server.pem"
  • node['nagios']['ssl_cert_chain_file'] = Optional location of SSL Intermediate Certificate File. No default.
  • node['nagios']['ssl_cert_key'] = Location of SSL Certificate Key. default "/etc/nagios3/certificates/nagios-server.pem"
  • node['nagios']['http_port'] - port that the Apache/Nginx virtual site should listen on, determined whether ssl is enabled (443 if so, otherwise 80). Note: You will also need to configure the listening port for either NGINX or Apache within those cookbooks.
  • node['nagios']['server_name'] - common name to use in a server cert, default "nagios"
  • node['nagios']['ssl_req'] - info to use in a cert, default /C=US/ST=Several/L=Locality/O=Example/OU=Operations/CN=#{node['nagios']['server_name']}/emailAddress=ops@#{node['nagios']['server_name']}

  • node['nagios']['server']['url'] - url to download the server source from if installing from source

  • node['nagios']['server']['version'] - version of the server source to download
  • node['nagios']['server']['checksum'] - checksum of the source files
  • node['nagios']['url'] - URL to host Nagios from - defaults to nil and instead uses FQDN

  • node['nagios']['notifications_enabled'] - set to 1 to enable notification.

  • node['nagios']['check_external_commands']
  • node['nagios']['default_contact_groups']
  • node['nagios']['additional_contacts'] - additional contacts to be utilized for notifying of status changes. Example: node['nagios']['additional_contacts']['pagerduty'] = true.
  • node['nagios']['sysadmin_email'] - default notification email.
  • node['nagios']['sysadmin_sms_email'] - default notification sms.
  • node['nagios']['server_auth_method'] - authentication with the server can be done with openid (using apache2::mod_auth_openid), cas (using apache2::mod_auth_cas),ldap (using apache2::mod_authnz_ldap), or htauth (basic). The default is htauth. "openid" will utilize openid authentication, "cas" will utilize cas authentication, "ldap" will utilize LDAP authentication, and any other value will use htauth (basic).
  • node['nagios']['cas_login_url'] - login url for cas if using cas authentication.
  • node['nagios']['cas_validate_url'] - validation url for cas if using cas authentication.
  • node['nagios']['cas_validate_server'] - whether to validate the server cert. Defaults to off.
  • node['nagios']['cas_root_proxy_url'] - if set, sets the url that the cas server redirects to after auth.
  • node['nagios']['ldap_bind_dn'] - DN used to bind to the server when searching for ldap entries.
  • node['nagios']['ldap_bind_password'] - bind password used with the DN provided for searching ldap.
  • node['nagios']['ldap_url'] - ldap url and search parameters.
  • node['nagios']['ldap_authoritative'] - accepts "on" or "off". controls other authentication modules from authenticating the user if this one fails.
  • node['nagios']['users_databag'] - the databag containing users to search for. defaults to users
  • node['nagios']['users_databag_group'] - users databag group considered Nagios admins. defaults to sysadmin
  • node['nagios']['services_databag'] - the databag containing services to search for. defaults to nagios_services
  • node['nagios']['servicegroups_databag'] - the databag containing servicegroups to search for. defaults to nagios_servicegroups
  • node['nagios']['templates_databag'] - the databag containing templates to search for. defaults to nagios_templates
  • node['nagios']['eventhandlers_databag'] - the databag containing eventhandlers to search for. defaults to nagios_eventhandlers
  • node['nagios']['unmanaged_hosts_databag'] - the databag containing unmanagedhosts to search for. defaults to nagios_unmanagedhosts
  • node['nagios']['serviceescalations_databag'] - the databag containing serviceescalations to search for. defaults to nagios_serviceescalations
  • node['nagios']['hostescalations_databag'] - the databag containing hostescalations to search for. defaults to nagios_hostescalations
  • node['nagios']['contacts_databag'] - the databag containing contacts to search for. defaults to nagios_contacts
  • node['nagios']['contactgroups_databag'] - the databag containing contactgroups to search for. defaults to nagios_contactgroups
  • node['nagios']['servicedependencies_databag'] - the databag containing servicedependencies to search for. defaults to nagios_servicedependencies
  • node['nagios']['host_name_attribute'] - node attribute to use for naming the host. Must be unique across monitored nodes. Defaults to hostname
  • node['nagios']['regexp_matching'] - Attribute to enable regexp matching. Defaults to 0.
  • node['nagios']['large_installation_tweaks'] - Attribute to enable large installation tweaks. Defaults to 0.
  • node['nagios']['templates']
  • node['nagios']['interval_length'] - minimum interval.
  • node['nagios']['brokers'] - Hash of broker modules to include in the config. Hash key is the path to the broker module, the value is any parameters to pass to it.

These set directives in the default host template. Unless explicitly overridden, they will be inherited by the host definitions for each discovered node and nagios_unmanagedhosts data bag. For more information about these directives, see the Nagios documentation for host definitions.

  • node['nagios']['default_host']['flap_detection'] - Defaults to true.
  • node['nagios']['default_host']['check_period'] - Defaults to '24x7'.
  • node['nagios']['default_host']['check_interval'] - In seconds. Must be divisible by node['nagios']['interval_length']. Defaults to 15.
  • node['nagios']['default_host']['retry_interval'] - In seconds. Must be divisible by node['nagios']['interval_length']. Defaults to 15.
  • node['nagios']['default_host']['max_check_attempts'] - Defaults to 1.
  • node['nagios']['default_host']['check_command'] - Defaults to the pre-defined command 'check-host-alive'.
  • node['nagios']['default_host']['notification_interval'] - In seconds. Must be divisible by node['nagios']['interval_length']. Defaults to 300.
  • node['nagios']['default_host']['notification_options'] - Defaults to 'd,u,r'.

  • node['nagios']['server']['web_server'] - web server to use. supports Apache or Nginx, default "apache"

  • node['nagios']['server']['nginx_dispatch'] - nginx dispatch method. supports cgi or php, default "cgi"
  • node['nagios']['server']['stop_apache'] - stop apache service if using nginx, default false
  • node['nagios']['server']['redirect_root'] - if using Apache, should http://server/ redirect to http://server/nagios3 automatically, default false
  • node['nagios']['server']['normalize_hostname'] - If set to true, normalize all hostnames in hosts.cfg to lowercase. Defaults to false.

These are additional nagios.cfg options.

  • node['nagios']['conf']['max_service_check_spread'] - Defaults to 5
  • node['nagios']['conf']['max_host_check_spread'] - Defaults to 5
  • node['nagios']['conf']['service_check_timeout'] - Defaults to 60
  • node['nagios']['conf']['host_check_timeout'] - Defaults to 30
  • node['nagios']['conf']['process_performance_data'] - Defaults to 0
  • node['nagios']['conf']['date_format'] - Defaults to 'iso8601'
  • node['nagios']['conf']['p1_file'] - Defaults to #{node['nagios']['home']}/p1.pl
  • node['nagios']['conf']['debug_level'] - Defaults to 0
  • node['nagios']['conf']['debug_verbosity'] - Defaults to 1
  • node['nagios']['conf']['debug_file'] - Defaults to #{node['nagios']['state_dir']}/#{node['nagios']['server']['name']}.debug

    These are nagios cgi.config options.

  • node['nagios']['cgi']['show_context_help'] - Defaults to 1

  • node['nagios']['cgi']['authorized_for_system_information'] - Defaults to '*'
  • node['nagios']['cgi']['authorized_for_configuration_information'] - Defaults to '*'
  • node['nagios']['cgi']['authorized_for_system_commands'] - Defaults to '*'
  • node['nagios']['cgi']['authorized_for_all_services'] - Defaults to '*'
  • node['nagios']['cgi']['authorized_for_all_hosts'] - Defaults to '*'
  • node['nagios']['cgi']['authorized_for_all_service_commands'] - Defaults to '*'
  • node['nagios']['cgi']['authorized_for_all_host_commands'] - Defaults to '*'
  • node['nagios']['cgi']['default_statusmap_layout'] - Defaults to 5
  • node['nagios']['cgi']['default_statuswrl_layout'] - Defaults to 4
  • node['nagios']['cgi']['escape_html_tags'] - Defaults to 0
  • node['nagios']['cgi']['action_url_target'] - Defaults to '_blank'
  • node['nagios']['cgi']['notes_url_target'] - Defaults to '_blank'
  • node['nagios']['cgi']['lock_author_names'] - Defaults to 1

Recipes

default

Includes the correct client installation recipe based on platform, either nagios::server_package or nagios::server_source.

The server recipe sets up Apache as the web front end by default. The nagios::client recipe is also included. This recipe also does a number of searches to dynamically build the hostgroups to monitor, hosts that belong to them and admins to notify of events/alerts.

Searches are confined to the node's chef_environment unless multi-environment monitoring is enabled.

The recipe does the following:

  1. Searches for users in 'users' databag belonging to a 'sysadmin' group, and authorizes them to access the Nagios web UI and also to receive notification e-mails.
  2. Searches all available roles/environments and builds a list which will become the Nagios hostgroups.
  3. Places nodes in Nagios hostgroups by role / environment membership.
  4. Installs various packages required for the server.
  5. Sets up configuration directories.
  6. Moves the package-installed Nagios configuration to a 'dist' directory.
  7. Disables the 000-default VirtualHost present on Debian/Ubuntu Apache2 package installations.
  8. Templates configuration files for services, contacts, contact groups, templates, hostgroups and hosts.
  9. Enables the Nagios web UI.
  10. Starts the Nagios server service

server_package

Installs the Nagios server from packages. Default for Debian / Ubuntu systems.

server_source

Installs the Nagios server from source. Default for Red Hat / Fedora based systems as native packages for Nagios are not available in the default repositories.

pagerduty

Installs pagerduty plugin for nagios. If you only have a single pagerduty key, you can simply set a node['nagios']['pagerduty_key'] attribute on your server. For multiple pagerduty key configuration see Pager Duty under Data Bags.

This recipe was written based on the Nagios Integration Guide from PagerDuty which explains how to get an API key for your Nagios server.

Data Bags

Users

Create a users data bag that will contain the users that will be able to log into the Nagios webui. Each user can use htauth with a specified password, or an openid. Users that should be able to log in should be in the sysadmin group. Example user data bag item:

{
  "id": "nagiosadmin",
  "groups": "sysadmin",
  "htpasswd": "hashed_htpassword",
  "openid": "http://nagiosadmin.myopenid.com/",
  "nagios": {
    "pager": "nagiosadmin_pager@example.com",
    "email": "nagiosadmin@example.com"
  }
}

When using server_auth_method 'openid' (default), use the openid in the data bag item. Any other value for this attribute (e.g., "htauth", "htpasswd", etc) will use the htpasswd value as the password in /etc/nagios3/htpasswd.users.

The openid must have the http:// and trailing /. The htpasswd must be the hashed value. Get this value with htpasswd:

% htpasswd -n -s nagiosadmin
New password:
Re-type new password:
nagiosadmin:{SHA}oCagzV4lMZyS7jl2Z0WlmLxEkt4=

For example use the {SHA}oCagzV4lMZyS7jl2Z0WlmLxEkt4= value in the data bag.

Contacts and Contact Groups

To send alerting notification to contacts that aren't authorized to login to Nagios via the 'users' data bag create nagios_contacts and nagios_contactgroups data bags.

Example nagios_contacts data bag item

{
  "id": "devs",
  "alias": "Developers",
  "use": "default-contact",
  "email": "devs@company.com",
  "pager": "page_the_devs@company.com"
}

Example nagios_contactgroup data bag item

{
  "id": "non_admins",
  "alias": "Non-Administrator Contacts",
  "members": "devs,helpdesk,managers"
}

Services

To add service checks to Nagios create a nagios_services data bag containing definitions for services to be monitored. This allows you to add monitoring rules without directly editing the services and commands templates in the cookbook. Each service will be named based on the id of the data bag item and the command will be named using the same id prepended with "check_". Just make sure the id in your data bag doesn't conflict with a service or command already defined in the templates.

Here's an example of a service check for sshd that you could apply to all hostgroups:

{
  "id": "ssh",
  "hostgroup_name": "linux",
  "command_line": "$USER1$/check_ssh $HOSTADDRESS$"
}

You may optionally define the service template for your service by including service_template and a valid template name. Example: "service_template": "special_service_template". You may also optionally add a service description that will be displayed in the Nagios UI using "description": "My Service Name". If this is not present the databag item ID will be used as the description. You use defined escalations for the service with 'use_escalation'. See _Service_Escalations for more information.

You may also use an already defined command definition by omitting the command_line parameter and using use_existing_command parameter instead:

{
  "id": "pingme",
  "hostgroup_name": "all",
  "use_existing_command": "check-host-alive"
}

You may also specify that a check only be run if the nagios server is in a specific environment. This is useful if you have nagios servers in several environments but you would like a service check to only apply in one particular environment:

{
  "id": "ssh",
  "hostgroup_name": "linux",
  "activate_check_in_environment": "staging",
  "command_line": "$USER1$/check_ssh $HOSTADDRESS$"
}

Service Groups

Create a nagios_servicegroups data bag that will contain definitions for service groups. Each server group will be named based on the id of the data bag.

{
  "id": "ops",
  "alias": "Ops",
  "notes": "Services for ops"
}

You can group your services by using the "servicegroups" keyword in your services data bags. For example, to have your ssh checks show up under the ops service group, you could define it like this:

{
  "id": "ssh",
  "hostgroup_name": "all",
  "command_line": "$USER1$/check_ssh $HOSTADDRESS$",
  "servicegroups": "ops"
}

Service Dependencies

Create a nagios_servicedependencies data bag that will contain definitions for service dependencies. Each service dependency will be named based on the id of the data bag. Each service dependency requires a dependent host name and/or hostgroup name, dependent service description, host name and/or hostgroup name, and service description.

{
  "id": "Service_X_depends_on_Service_Y",
  "dependent_host_name": "ServerX",
  "dependent_service_description": "Service X",
  "host_name": "ServerY",
  "service_description": "Service Y",
  "notification_failure_criteria": "u, c"
}

Additional directives can be defined as described in the Nagios documentation.

Time Periods

Create a data bag for time periods, nagios_timeperiods by default, for timeperiod defintions. Time periods are named based on the id of the data bag, and the id and alias are required.

Here is an example timeperiod definition:

{
  "id": "time_period_name",
  "alias": "This time period goes from now to then",
  "times": [
    "sunday 09:00-17:00",
    "monday 09:00-17:00",
    "tuesday 09:00-17:00",
    "wednesday 09:00-17:00",
    "thursday 09:00-17:00",
    "friday 09:00-17:00",
    "saturday 09:00-17:00"
  ]
}

Additional information on defining time periods can be found in the Nagios Documentation.

Templates

Templates are optional, but allow you to specify combinations of attributes to apply to a service. Create a nagios_templates\ data bag that will contain definitions for templates to be used. Each template need only specify id and whichever parameters you want to override.

Here's an example of a template that reduces the check frequency to once per day and changes the retry interval to 1 hour.

{
  "id": "dailychecks",
  "check_interval": "86400",
  "retry_interval": "3600"
}

You then use the template in your service data bag as follows:

{
  "id": "expensive_service_check",
  "hostgroup_name": "linux",
  "command_line": "$USER1$/check_example $HOSTADDRESS$",
  "service_template": "dailychecks"
}

Search Defined Hostgroups

Create a nagios_hostgroups data bag that will contain definitions for Nagios hostgroups populated via search. These data bags include a Chef node search query that will populate the Nagios hostgroup with nodes based on the search.

Here's an example to find all HP hardware systems for an "hp_systems" hostgroup:

{
  "search_query": "dmi_system_manufacturer:HP",
  "hostgroup_name": "hp_systems",
  "id": "hp_systems"
}

Monitoring Systems Not In Chef

Create a nagios_unmanagedhosts data bag that will contain definitions for hosts not in Chef that you would like to manage. "hostgroups" can be an existing Chef role (every Chef role gets a Nagios hostgroup) or a new hostgroup. Note that "hostgroups" must be an array of hostgroups even if it contains just a single hostgroup.

Here's an example host definition:

{
  "address": "webserver1.mydmz.dmz",
  "hostgroups": ["web_servers","production_servers"],
  "id": "webserver1",
  "notifications": 1
}

Similar to services, you may also filter unmanaged hosts by environment. This is useful if you have nagios servers in several environments but you would like to monitor an unmanaged host that only exists in a particular environment:

{
  "address": "webserver1.mydmz.dmz",
  "hostgroups": ["web_servers","production_servers"],
  "id": "webserver1",
  "environment": "production",
  "notifications": 1
}

Service Escalations

You can optionally define service escalations for the data bag defined services. Doing so involves two steps - creating the nagios_serviceescalations data bag and invoking it from the service. For example, to create an escalation to page managers on a 15 minute period after the 3rd page:

{
  "id": "15-minute-escalation",
  "contact_groups": "managers",
  "first_notification": "3",
  "last_notification": "0",
  "escalation_period": "24x7",
  "notification_interval": "900"
}

Then, in the service data bag,

{
  "id": "my-service",
  // ...
  "use_escalation": "15-minute-escalation"
}

You can also define escalations using wildcards, like so:

{
  "id": "first-warning",
  "contact_groups": "sysadmin",
  "hostgroup_name": "*",
  "first_notification": "1",
  "last_notification": "0",
  "notification_interval": "21600",
  "escalation_period": "24x7",
  "escalation_options": "w",
  "hostgroup_name": "*",
  "service_description": "*",
  "register": 1
}

This configures notifications for all warnings to repeat on a given interval (under the default config, every 6 hours). (Note that you must register this kind of escalation, as it is not a template.)

Event Handlers

You can optionally define event handlers to trigger on service alerts by creating a nagios_eventhandlers data bag that will contain definitions of event handlers for services monitored via Nagios.

This example event handler data bags restarts chef-client. Note: This assumes you have already defined a NRPE job restart_chef-client on the host where this command will run. You can use the NRPE LWRP to add commands to your local NRPE configs from within your cookbooks.

{
  "command_line": "$USER1$/check_nrpe -H $HOSTADDRESS$ -t 45 -c restart_chef-client",
  "id": "restart_chef-client"
}

Once you've defined an event handler you will need to add the event handler to a service definition in order to trigger the action. See the example service definition below.

{
  "command_line": "$USER1$/check_nrpe -H $HOSTADDRESS$ -t 45 -c check_chef_client",
  "hostgroup_name": "linux",
  "id": "chef-client",
  "event_handler": "restart_chef-client"
}

Pager Duty

You can define pagerduty contacts and keys by creating nagios_pagerduty data bags that contain the contact and the relevant key. Setting admin_contactgroup to "true" will add this pagerduty contact to the admin contact group created by this cookbook.

{
  "id": "pagerduty_critical",
  "admin_contactgroup": "true",
  "key": "a33e5ef0ac96772fbd771ddcccd3ccd0"
}

You can add these contacts to any contactgroups you create.

Monitoring Role

Create a role to use for the monitoring server. The role name should match the value of the attribute "node['nagios']['server_role']". By default, this is 'monitoring'. For example:

# roles/monitoring.rb
name 'monitoring'
description 'Monitoring server'
run_list(
  'recipe[nagios::server]'
)

default_attributes(
  'nagios' => {
    'server_auth_method' => 'htauth'
  }
)
$ knife role from file monitoring.rb

Definitions

nagios_conf

This definition is used to drop in a configuration file in the base Nagios configuration directory's conf.d. This can be used for customized configurations for various services.

Libraries

default

The library included with the cookbook provides some helper methods used in templates.

  • nagios_boolean
  • nagios_interval - calculates interval based on interval length and a given number of seconds.
  • nagios_attr - retrieves a nagios attribute from the node.

Usage

server setup

Create a role named 'monitoring', and add the nagios server recipe to the run_list. See Monitoring Role above for an example.

Apply the Nagios client recipe to nodes in order to install the NRPE client

By default the Nagios server will only monitor systems in its same environment. To change this set the multi_environment_monitoring attribute. See Attributes

Create data bag items in the users data bag for each administer you would like to be able to login to the Nagios server UI. Pay special attention to the method you would like to use to authorization users (openid or htauth). See Users and Atttributes

At this point you now have a minimally functional Nagios server, however the server will lack any service checks outside of the single Nagios Server health check.

defining checks

NRPE commands are defined in recipes using the nrpecheck LWRP provider. For base system monitoring such as load, ssh, memory, etc you may want to create a cookbook in your environment that defines each monitoring command via the LWRP. See the examples folder for an example of base monitoring.

With NRPE commands created using the LWRP you will need to define Nagios services to use those commands. These services are defined using the nagios_services data bag and applied to roles and/or environments. See Services

enabling notifications

You need to set default['nagios']['notifications_enabled'] = 1 attribute on your Nagios server to enable email notifications.

For email notifications to work an appropriate mail program package and local MTA need to be installed so that /usr/bin/mail or /bin/mail is available on the system.

Example:

Include postfix cookbook to be installed on your Nagios server node.

Add override_attributes to your monitoring role:

# roles/monitoring.rb
name 'monitoring'
description 'Monitoring Server'
run_list(
  'recipe[nagios::server]',
  'recipe[postfix]'
)

override_attributes(
  'nagios' => { 'notifications_enabled' => '1' },
  'postfix' => { 'myhostname':'your_hostname', 'mydomain':'example.com' }
)

default_attributes(
  'nagios' => { 'server_auth_method' => 'htauth' }
)
$ knife role from file monitoring.rb

License & Authors

Copyright 2009, 37signals
Copyright 2009-2013, Chef, Inc
Copyright 2012, Webtrends Inc.
Copyright 2013-2014, Limelight Networks, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
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