I am working on building a facter tag based node classifier similar to
https://github.com/jordansissel/puppet-examples/tree/master/nodeless-puppet/.
However, I have run into an issue where I cannot use puppet's require
file ability to push the yaml file containing the facts file to the
client because it would require two runs of puppet to pickup changes.
Consequently, I have written into the facter ruby script the ability
to connect to puppet's restful api and get the yaml file from the
private store. This works fine in irb, ruby, and facter if called
directly. However, when run inside of a puppet run it seems to fail on
parsing the http response correctly into yaml. As a result, it does
not get saved to disk and loaded as a fact for the puppet run.
There is probably a simpler way to do this. Essentially we want to
have tags on a server and use that to selectively include or remove
modules from a server by facter tags rather than by a server's name.
Some Version Information:
- os = CentOS release 5.2 (Final)
- ruby = ruby 1.8.6 (2008-08-11 patchlevel 287) [x86_64-linux]
- facter = 1.6.0 (updated because my script loads multiple facts and
the older version we were running requires the filename to match the
fact name. This was not working because I did not want to split my
ruby load script into multiple files to match each of the fact names.)
- puppet = 0.25.4
Yaml file it is trying to grab from a private store:
---
role:
- base
- db
env:
- dev
The yaml file downloads correctly via a puppet run without my script.
I can also wget the file and use net/https via ruby to get the file.
All methods return the correct file with matching md5sums.
Under my module called "truth" I have the following:
- files -> private -> domain.inter -> hostname -> truth_tags.yml
ex:
---
role:
- base
env:
- dev
- lib -> facter -> load_truth_tags.rb
problem area:
def apitruthtag(calltype)
# set some client side variables to build on later
sslbasedir = '/etc/puppet/ssl'
sslprivdir = sslbasedir + '/private_keys'
sslpubdir = sslbasedir + '/certs'
sslcafile = sslpubdir + '/ca.pem'
# this sets if we want metadata or content from puppet
datatype = calltype
# We want yaml back from puppet
header = {'Accept' => 'yaml'}
# Setup some connection variables to our puppet server and what we
want from it
proto = 'https'
server = 'puppet.domain.inter'
port = '8140'
path = '/production/file_' + datatype + '/truth_private/
truth_tags.yml'
# Build the full uri to request from our puppet server. Then parse
it for port and things
uri = URI.parse(proto + '://' + server + ':' + port + path)
# Setup the http module and set it for getting data
http = Net::HTTP.new(uri.host, uri.port)
request = Net::HTTP::Get.new(uri.request_uri, header)
http.use_ssl = true if uri.scheme == 'https'
# Enable ssl verification to ensure we are talking to the correct
people
http.verify_mode = OpenSSL::SSL::VERIFY_PEER
# Cert Auth:
# Set certificate paths
# puppet certificate authority file
if File.readable?(sslcafile) then
# Puppet ca file
http.ca_file = sslcafile
puts "readable? " + sslprivdir + '/' + hostname + '.pem' if $debug
if File.readable?(sslprivdir + '/' + hostname + '.pem') then
# client private key
http.key = OpenSSL::PKey::RSA.new(File.read(sslprivdir + '/' +
hostname + '.pem'))
puts "readable? " + sslpubdir + '/' + hostname + '.pem' if
$debug
if File.readable?(sslpubdir + '/' + hostname + '.pem') then
# client public key
http.cert = OpenSSL::X509::Certificate.new(File.read(sslpubdir
+ '/' + hostname + '.pem'))
# Make the request
response = http.request(request)
else
raise "No readable client pubic key in #{sslpubdir}/
#{hostname}.pem"
end # End public key check
else
raise "No readable client private key in #{sslprivdir}/
#{hostname}.pem"
end # End private key check
else
raise "No readable ca cert in #{sslcafile}"
end # End ca file check
# Check to make sure we got some data back
if response != nil
# Check to see if we have a good server response before saving the
variable
puts "check code " + response.code if $debug
if ((response.code < "300") and (response.code >= "200"))
return response.body
else
raise "server did not return an acceptable reponse code"
end # end server response code check
else
raise "No response from #{server}"
end # end nil response check
end # end apitruthtag
servermd5 = YAML.load(apitruthtag("metadata")).ivars["checksum"] #
When executed from a puppet run I tells me that ivars is undefined.
- lib -> puppet -> parser -> functions -> truth_tags.rb
- manifests -> init.pp
ex:
class truth inherits truth::init_bootstrap {
if truth_tag('role', 'base') and !truth_tag('role', 'nobase') {
notice("${::hostname}: Including role, base modules...")
notice(" ${::hostname}: role, base: including network")
include network
}
}
- manifests -> init_bootstrap.pp
just makes sure the /etc/truth_tags.yml file exists on disk
Process (if the facter yaml load was working):
1. puppet client downloads "lib -> facter -> load_truth_tags.rb".
2. facter runs with the external ruby fact script.
- this fails on puppet runs but functions correctly directly in
ruby, irb, and facter itself using "facter -d"
- If working load_truth_tags.rb would do this:
1. See if a cached /etc/truth_tags.yml file exists
2. if it does exist then it md5 hashes the file. Next, it uses net/
https to connect to the resful api to get the puppetmaster's hash to
see if the local file has changed. If they differ it pulls down the
changed file from puppetmaster and writes it to disk.
3. if the file does not exist on disk it pulls it down from
puppetmaster using net/https and checks both the server and client
hashes to see if it was modified in transit and that it downloaded the
correct content.
3. Next, manifests -> init.pp loads the truth_tags function from lib -
> puppet -> parser -> functions -> truth_tags.rb for the puppet run.
- the manifest init.pp file is basically a set of rules that says if
role = db then include these other functions. The goal being we don't
want to classify servers by name but rather by their functions. This
would allow us to be more flexible and not have to worry about double
including things in the nodes.pp file.
Sorry I have not included all of the "load_truth_tags.rb" script as it
is long (317 lines). I can if requested.
Issue I can see which differs from a puppet run vs stand alone ruby
run:
irb, ruby, or facter:
yaml parsed http response = #<YAML::Object:0x2ada01f7cf00>
puppet run:
yaml parsed http response = #<Puppet::FileServing::Metadata:
0x2ac7987b9c08>
with error:
undefined method `ivars' for #<Puppet::FileServing::Metadata:
0x2ac7987152c0>
#<NoMethodError: undefined method `ivars' for
#<Puppet::FileServing::Metadata:0x2ac7987152c0>>
and traceback:
/var/puppet/lib/facter/load_truth_tags.rb:253:in `calcservertruthmd5'
/var/puppet/lib/facter/load_truth_tags.rb:268
/opt/ruby-1.8.6-p287/lib/ruby/1.8/timeout.rb:62:in `timeout'
/var/puppet/lib/facter/load_truth_tags.rb:37
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter/util/loader.rb:
73:in `load'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter/util/loader.rb:
73:in `load_file'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter/util/loader.rb:
38:in `load_all'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter/util/loader.rb:
33:in `each'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter/util/loader.rb:
33:in `load_all'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter/util/loader.rb:
30:in `each'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter/util/loader.rb:
30:in `load_all'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter/util/collection.rb:
94:in `load_all'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/facter.rb:218:in
`loadfacts'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/configurer/
fact_handler.rb:61:in `reload_facter'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/configurer/
fact_handler.rb:18:in `find_facts'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/configurer/
fact_handler.rb:29:in `facts_for_uploading'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/configurer.rb:
100:in `retrieve_catalog'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/configurer.rb:
162:in `run'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/agent.rb:53:in
`run'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/agent/locker.rb:
21:in `lock'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/agent.rb:53:in
`run'
/opt/ruby-1.8.6-p287/lib/ruby/1.8/sync.rb:229:in `synchronize'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/agent.rb:53:in
`run'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/agent.rb:134:in
`with_client'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/agent.rb:51:in
`run'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/application/
puppetd.rb:103:in `onetime'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/application.rb:
226:in `send'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/application.rb:
226:in `run_command'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/application.rb:
217:in `run'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/application.rb:
306:in `exit_on_fail'
/opt/ruby-1.8.6-p287/lib/ruby/site_ruby/1.8/puppet/application.rb:
217:in `run'
/usr/sbin/puppetd:159
It appears that yaml is not parsing correctly when run inside a puppet
run. As a result, the response.body.ivars["checksum"] variable is not
being set. Any ideas?
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