DEPRECATED

This repository is now deprecated and it will be available until 01.06.2021.

Sensu-Puppet

Installs and manages the open source monitoring framework Sensu.

Tested with Travis CI

Documented with Puppet Strings

Puppet Strings documentation

Sensu version supported

The module currently supports Sensu version 0.12 and later. If not explicitly stated it should always support the latest Sensu release. Please log an issue if you identify any incompatibilities.

Upgrade note

Versions prior to 1.0.0 are incompatible with previous versions of the Sensu-Puppet module.

Installation

$ puppet module install sensu/sensu

Prerequisites

• Redis server and connectivity to a Redis database
• RabbitMQ server, vhost, and credentials
• Ruby JSON library or gem

Dependencies

• puppetlabs/apt
• puppetlabs/stdlib
• maestrodev/wget

See metadata.json for details.

Pluginsync should be enabled. Also, you will need the Ruby JSON library or gem on all your nodes.

EPEL

Rubygem:

$ sudo gem install json

Debian & Ubuntu:

$ sudo apt-get install ruby-json

Quick start

Before this Puppet module can be used, the following items must be configured on the server.

• Install Redis
• Install RabbitMQ
• Add users to RabbitMQ
• Install dashboard (optional)

To quickly try out Sensu, spin up a test virtual machine with Vagrant that already has these prerequisites installed.

$ vagrant up
$ vagrant status
$ vagrant ssh sensu-server

You can then access the API.

$ curl http://admin:secret@localhost:4567/info

Navigate to 192.168.56.10:3000 to use the uchiwa dashboard

username => uchiwa
password => uchiwa

Navigate to 192.168.56.10:15672 to manage RabbitMQ

username => sensu
password => correct-horse-battery-staple

See the tests directory and Vagrantfile for examples on setting up the prerequisites.

Basic example

Sensu server

node 'sensu-server.foo.com' {
  class { 'sensu':
    rabbitmq_password => 'correct-horse-battery-staple',
    server            => true,
    api               => true,
    plugins           => [
      'puppet:///data/sensu/plugins/ntp.rb',
      'puppet:///data/sensu/plugins/postfix.rb'
    ]
  }

  sensu::handler { 'default':
    command => 'mail -s \'sensu alert\' ops@foo.com',
  }

  sensu::check { 'check_ntp':
    command     => 'PATH=$PATH:/usr/lib/nagios/plugins check_ntp_time -H pool.ntp.org -w 30 -c 60',
    handlers    => 'default',
    subscribers => 'sensu-test'
  }

  sensu::check { '...':
    ...
  }
}

Sensu client

node 'sensu-client.foo.com' {
   class { 'sensu':
     rabbitmq_password  => 'correct-horse-battery-staple',
     rabbitmq_host      => 'sensu-server.foo.com',
     subscriptions      => 'sensu-test',
   }
}

Advanced example using Hiera

This example includes the sensu class as part of a base class or role and configures Sensu on each individual node via Hiera.

hiera.yaml

---
:hierarchy:
  - %{fqdn}
  - %{datacenter}
  - common
:backends:
  - yaml
:yaml:
  :datadir: '/etc/puppet/%{environment}/modules/hieradata'

common.yaml

sensu::install_repo: false
sensu::purge_config: true
sensu::rabbitmq_host: 10.31.0.90
sensu::rabbitmq_password: password
sensu::rabbitmq_port: 5672

sensu-server.foo.com.yaml

sensu::server: true

nosensu.foo.com.yaml

sensu::client: false

site.pp

node default {
  class { 'sensu': }
  ...
}

Safe Mode checks

By default Sensu clients will execute whatever check messages are on the queue. This is potentially a large security hole.

If you enable the safe_mode parameter, it will require that checks are defined on the client. If standalone checks are used then defining on the client is sufficient, otherwise checks will also need to be defined on the server as well.

A usage example is shown below.

Sensu server

Each component of Sensu can be controlled separately. The server components are managed with the server, and API parameters.

node 'sensu-server.foo.com' {
  class { 'sensu':
    rabbitmq_password => 'correct-horse-battery-staple',
    server            => true,
    api               => true,
    plugins           => [
      'puppet:///data/sensu/plugins/ntp.rb',
      'puppet:///data/sensu/plugins/postfix.rb'
    ],
    safe_mode         => true,
  }

  ...

  sensu::check { "diskspace":
    command => '/etc/sensu/plugins/system/check-disk.rb',
  }


}

Sensu client

node 'sensu-client.foo.com' {
   class { 'sensu':
     rabbitmq_password  => 'correct-horse-battery-staple',
     rabbitmq_host      => 'sensu-server.foo.com',
     subscriptions      => 'sensu-test',
     safe_mode          => true,
   }

  sensu::check { "diskspace":
    command => '/etc/sensu/plugins/system/check-disk.rb',
  }
}

Using custom variables in check definitions

sensu::check{ 'check_file_test':
  command      => '/usr/local/bin/check_file_test.sh',
  handlers     => 'notifu',
  custom       => {
    'foo'      => 'bar',
    'numval'   => 6,
    'boolval'  => true,
    'in_array' => ['foo','baz']
  },
  subscribers  => 'sensu-test'
}

This will create the following check definition for Sensu:

{
  "checks": {
    "check_file_test": {
      "handlers": [
        "notifu"
      ],
      "in_array": [
        "foo",
        "baz"
      ],
      "command": "/usr/local/bin/check_file_test.sh",
      "subscribers": [
        "sensu-test"
      ],
      "foo": "bar",
      "interval": 60,
      "numval": 6,
      "boolval": true
    }
  }
}

Handler configuration

sensu::handler {
  'handler_foobar':
    command => '/etc/sensu/handlers/foobar.py',
    type    => 'pipe',
    config  => {
      'foobar_setting' => 'value',
  }
}

This will create the following handler definition for Sensu (server):

 {
   "handler_foobar": {
     "foobar_setting": "value"
   },
   "handlers": {
      "handler_foobar": {
        "command": "/etc/sensu/plugins/foobar.py",
        "severities": [
          "ok",
          "warning",
          "critical",
          "unknown"
        ],
      "type": "pipe"
      }
   }
 }

Extension configuration

sensu::extension {
  'an_extension':
    source  => 'puppet://somewhere/an_extension.rb',
    config  => {
      'foobar_setting' => 'value',
  }
}

This will save the extension under /etc/sensu/extensions and create the following configuration definition for Sensu:

 {
   "an_extension": {
     "foobar_setting": "value"
   },
 }

Disable Service Management

If you'd prefer to use an external service management tool such as DaemonTools or SupervisorD, you can disable the module's internal service management functions like so:

sensu::manage_services: false

Including Sensu monitoring in other modules

There are a few different patterns that can be used to include Sensu monitoring into other modules. One pattern creates a new class that is included as part of the host or node definition and includes a standalone check, for example:

apache/manifests/monitoring/sensu.pp

class apache::monitoring::sensu {
  sensu::check { 'apache-running':
    handlers    => 'default',
    command     => '/etc/sensu/plugins/check-procs.rb -p /usr/sbin/httpd -w 100 -c 200 -C 1',
    custom      => {
      refresh     => 1800,
      occurrences => 2,
    },
  }
}

You could also include subscription information and let the Sensu server schedule checks for this service as a subscriber:

apache/manifests/monitoring/sensu.pp

class apache::monitoring::sensu {
  sensu::subscription { 'apache': }
}

You can also define custom variables as part of the subscription:

ntp/manifests/monitoring/ntp.pp

class ntp::monitoring::sensu {
  sensu::subscription { 'ntp':
    custom => {
      ntp {
        server => $ntp::servers[0],
      },
    },
  }
}

And then use that variable on your Sensu server:

sensu::check { 'check_ntp':
  command     => 'PATH=$PATH:/usr/lib/nagios/plugins check_ntp_time -H :::ntp.server::: -w 30 -c 60',
  ...
}

If you would like to automatically include the Sensu monitoring class as part of your existing module with the ability to support different monitoring platforms, you could do something like:

apache/manifests/service.pp

$monitoring = hiera('monitoring', '')

case $monitoring {
  'sensu':  { include apache::monitoring::sensu }
  'nagios': { include apache::monitoring::nagios }
}

Installing Gems into the embedded ruby

If you are using the embedded ruby that ships with Sensu, you can install gems by using the sensu_gem package provider:

package { 'redphone':
  ensure   => 'installed',
  provider => sensu_gem,
}

Dashboards

The following puppet modules exist for managing dashboards

• uchiwa

License

See LICENSE file.