hi

If you have a centralized ca you can proxy the certificate traffic to the 
central puppet ca service (1).

And forward all the other traffic to the local puppet server (2, 3).

The snippet requires puppetlabs-apache module > 1.4.1 as it won't include 
the proxy template with $proxy_pass_match only (it's already fixed on 
github). 

- Thomas


Docs:
1) 
https://docs.puppetlabs.com/guides/scaling_multiple_masters.html#option-2-proxy-certificate-traffic
2) 
https://docs.puppetlabs.com/puppetserver/2.1/external_ssl_termination.html
3) https://docs.puppetlabs.com/puppetserver/2.1/external_ca_configuration.html 
(relevant: Disabling the Internal Puppet CA Service) 


  include '::apache'

  apache::vhost { $::fqdn:
    servername        => "${::fqdn}:8140",
    serveraliases     => [ 'puppet', "puppet.${::domain}" ],
    port              => 8140,
    docroot           => '/var/www/html',
    ssl               => true,
    ssl_ca            => '/etc/puppetlabs/puppet/ssl/certs/ca.pem',
    ssl_cert          => "*/etc/puppetlabs/puppet/ssl/certs/*${::fqdn}.pem",
    ssl_key           => 
"*/etc/puppetlabs/puppet/ssl/private_keys/*${::fqdn}.pem",
    ssl_crl           => '/etc/puppetlabs/puppet/ssl/crl.pem',
    ssl_verify_client => 'optional',
    ssl_verify_depth  => 1,
    ssl_proxyengine   => true,
    ssl_options       => ['+StdEnvVars', '+ExportCertData'],
    proxy_pass_match  => [
      { 'path'      => '^/([^/]+/certificate.*)$',
        'url'       => 'https://puppetca:8140/$1 
<https://centralpuppetca:8140/$1>' },
      { 'path'      => '/(.*)',
        'url'       => 'http://localhost:18140/$1' },
    ],
    request_headers   => [
      'set X-Client-Verify %{SSL_CLIENT_VERIFY}e',
      'set X-Client-DN %{SSL_CLIENT_S_DN}e',
      #'set X-Client-Cert %{SSL_CLIENT_CERT}e', # disabled because of bug 
SERVER-217
      'edit X-Client-DN ^/(CN=.+)$ $1', # workaround for bug SERVER-213
    ]
  }



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