nagios | cookingclouds

Clone the opscode cookbook

$ git clone git@github.com:opscode-cookbooks/nagios.git

Create some berkshelf dependency stuff to make your life easier
( I’m going to assume you have berkshelf installed, if not

gem install berkself

and read this http://berkshelf.com/ )

$ cd nagios
$ cat>Berksfile<<EOF
metadata
cookbook 'bluepill'
cookbook 'perl'
cookbook 'rsyslog'
cookbook 'nginx'
cookbook 'nginx_simplecgi'

group :test do
#  cookbook 'minitest-handler', git: "git://github.com/btm/minitest-handler-cookbook.git"
end

EOF

Pull in your dependencies using Berkshelf and upload it to your chef-server

$ berks install
$ berks upload

Create your data bag for your nagios admin user

$ knife data bag create users
$ openssl passwd -1 -salt '78hJASHDGuywelhfsdkiukshdkfusdhgfu' 'nagiosadmin'
"$1$78hJASHD$KlWqNTM0UXf/iM6imQ.9F1"

$ cat>nagiosadmin.json<<EOF
{
  "id": "nagiosadmin",
  "groups": "sysadmin",
  "htpasswd": "$1$78hJASHD$KlWqNTM0UXf/iM6imQ.9F1",
  "nagios": {
    "pager": "nagiosadmin_pager@example.com",
    "email": "nagiosadmin@example.com"
  }
}
EOF

Upload your nagiosadmin user to data bag on your chef-server

$ knife data bag from file users nagiosadmin.json

Create a chef role for “monitoring”

$ cat>monitoring.rb<<EOF
name "monitoring"
run_list %w[
  recipe[nagios::server]
]

default_attributes({
  :nagios => {
    :server => {
      ### START Install Verison and Method
      :install_method => "package",
      ### END Install Version and Method
      :service_name => "nagios3",
      :home => "/usr/lib/nagios3",
      :conf_dir => "/etc/nagios3",
      :config_dir => "/etc/nagios3/conf.d",
      :cache_dir => "/var/cache/nagios3",
      :state_dir => "/var/lib/nagios3",
      :run_dir => "/var/run/nagios3",
      :docroot => "/usr/share/nagios3/htdocs",
      :server_name => "nagios",
      :web_server => "apache"
    },
    :client => {
      :install_method => "package"
    },
    :server_auth_method => "htauth",
    :url => "nagios.mydomain.com"
  }
})
EOF

Upload the “monitoring” role to chef-server and then apply the role and run chef-client

$ knife role from file monitoring.rb

$ knife node run_list add nagios.mydomain.com -r "role[monitoring]"
$ knife ssh -a ipaddress name:nagios.mydomain.com "chef-client"

Edit your local system’s host file to point the domain to the ip of your server if you don’t have DNS

10.0.1.1   nagios.mydomain.com

Add the nrpe configurations on your clients

Create the application cookbook for your custom nrpe service checks

$ knife cookbook create mydomain_nrpe
$ cd mydomain_nrpe/recipes
$ cat>default.rb<<EOF
#
# Cookbook Name:: monitoring
# Recipe:: base_monitoring
#
# Copyright 2013, Example Company, Inc.
#
# This recipe defines the necessary NRPE commands for base system monitoring
# in Example Company Inc's Chef environment.

include_recipe 'nagios::client'

# Check for high load.  This check defines warning levels and attributes
nagios_nrpecheck "check_load" do
  command "#{node['nagios']['plugin_dir']}/check_load"
  warning_condition "6"
  critical_condition "10"
  action :add
end

# Check all non-NFS/tmp-fs disks.
nagios_nrpecheck "check_all_disks" do
  command "#{node['nagios']['plugin_dir']}/check_disk"
  warning_condition "8%"
  critical_condition "5%"
  parameters "-A -x /dev/shm -X nfs -i /boot"
  action :add
end

# Check for excessive users.  This command relies on the service definition to
# define what the warning/critical levels and attributes are
nagios_nrpecheck "check_users" do
  command "#{node['nagios']['plugin_dir']}/check_users"
  action :add
end
EOF

Upload the cookbook

$ knife cookbook upload mydomain_nrpe

Add the recipe to the run list of a node you want the nrpe services installed to or just assign it to a role

$ knife node run_list add james.mydomain "recipe[mydomain_nrpe]"
$ knife ssh -a ipaddress -x root name:james.mydomain "chef-client"

Add services to your nagios server using data bag entires in “nagios_services” data bag

$ knife data bag create nagios_services
$ mkdir nagios_services
$ cd nagios_services

$ cat>ssh.json<<EOF
{
  "id": "ssh",
  "hostgroup_name": "linux",
  "command_line": "$USER1$/check_ssh $HOSTADDRESS$"
}
EOF

$ cat>pingme.json<EOF
{
"id": "pingme",
 "hostgroup_name": "linux",
 "use_existing_command": "check-host-alive"
}
EOF

$ wget https://raw.github.com/opscode-cookbooks/nagios/master/examples/nagios_services/users.json
$ wget https://raw.github.com/opscode-cookbooks/nagios/master/examples/nagios_services/load.json
$ wget https://raw.github.com/opscode-cookbooks/nagios/master/examples/nagios_services/all_disks.json

Ingest all the nagios json service files to chef-server and run chef-client on the nagios server

$ ls |while read i ; do knife data bag from file nagios_services $i ; done
$ knife ssh -a ipaddress -x root name:nagios.mydomain.com "chef-client"

Install a system that’s not managed by chef

$ knife data bag create nagios_unmanagedhosts

$ cat >my host.json<EOF
{
  "address": "myhost.mydomain.com",
  "hostgroups": ["linux"],
  "id": "myhost",
  "notifications": 0
}
EOF

$ knife data bag from file nagios_unmanagedhosts host.json
$ knife ssh -x root -a ipaddress name:nagios.mydomain.com "chef-client"

cookingclouds

Category nagios

Chef – Nagios Server quickstart