Puppet 3.8 Reference Manual

Puppet Server honors almost all settings in puppet.conf and should pick them up automatically. However, for some tasks, such as configuring the webserver or an external Certificate Authority, we have introduced new Puppet Server-specific configuration files and settings. These new files and settings are detailed below. For more information on the specific differences in Puppet Server’s support for puppet.conf settings as compared to the Ruby master, see the puppet.conf differences page.

Config Files

All of Puppet Server’s new config files and settings (with the exception of the logging config file) are located in the conf.d directory. These new config files are in HOCON format. HOCON keeps the basic structure of JSON, but is a more human-readable config file format. You can find details about this format in the HOCON documentation.

At startup, Puppet Server reads all the .conf files found in this directory, located at /etc/puppetserver/conf.d (open source releases) or /etc/puppetlabs/puppetserver/conf.d (Puppet Enterprise). Note that if you change these files and their settings, you must restart Puppet Server for those changes to take effect. The conf.d directory contains the following files and settings:


This file contains global configuration settings for Puppet Server. You shouldn’t typically need to make changes to this file. However, you can change the logging-config path for the logback logging configuration file if necessary. For more information about the logback file, see http://logback.qos.ch/manual/configuration.html.

global: {
  logging-config: /etc/puppetlabs/puppetserver/logback.xml


This file contains the web server configuration settings. The webserver.conf file looks something like this:

webserver: {
    client-auth = need
    ssl-host =
    ssl-port = 8140

# configure the mount points for the web apps
web-router-service: {
    # These two should not be modified because the Puppet 3.x agent expects them to
    # be mounted at "/"
    "puppetlabs.services.ca.certificate-authority-service/certificate-authority-service": ""
    "puppetlabs.services.master.master-service/master-service": ""

    # This controls the mount point for the puppet admin API.
    "puppetlabs.services.puppet-admin.puppet-admin-service/puppet-admin-service": "/puppet-admin-api"

The above settings set the webserver to require a valid certificate from the client; to listen on all available hostnames for encrypted HTTPS traffic; and to use port 8140 for encrypted HTTPS traffic. For full documentation, including a complete list of available settings and values, see Configuring the Webserver Service.

By default, Puppet Server is configured to use the correct Puppet Master and CA certificates. If you’re using an external CA and have provided your own certificates and keys, make sure webserver.conf points to the correct file. For details about configuring an external CA, see the External CA Configuration page.


This file contains the settings for Puppet Server itself.

  • The jruby-puppet settings configure the interpreter:
    • gem-home: This setting determines where JRuby looks for gems. It is also used by the puppetserver gem command line tool. If not specified, uses the Puppet default /var/lib/puppet/jruby-gems.
    • master-conf-dir: Optionally, set the path to the Puppet configuration directory. If not specified, uses the Puppet default /etc/puppet.
    • master-var-dir: Optionally, set the path to the Puppet variable directory. If not specified, uses the Puppet default /var/lib/puppet.
    • max-active-instances: Optionally, set the maximum number of JRuby instances to allow. Defaults to ‘num-cpus - 1’, with a minimum default value of 1 and a maximum default value of 4.
    • max-requests-per-instance: Optionally, limit how many HTTP requests a given JRuby instance will handle in its lifetime. When a JRuby instance reaches this limit, it gets flushed from memory and replaced with a fresh one. Defaults to 0, which disables automatic JRuby flushing.

      This can be useful for working around buggy module code that would otherwise cause memory leaks, but it causes a slight performance penalty whenever a new JRuby has to reload all of the Puppet Ruby code. If memory leaks from module code are not an issue in your deployment, the default value will give the best performance.

    • borrow-timeout: Optionally, set the timeout when attempting to borrow an instance from the JRuby pool in milliseconds. Defaults to 1200000.
  • The profiler settings configure profiling:
    • enabled: if this is set to true, it enables profiling for the Puppet Ruby code. Defaults to false.
  • The puppet-admin section configures the Puppet Server’s administrative API. (This is a new API, which isn’t provided by Rack or WEBrick Puppet masters.)
    • authorization-required determines whether a client certificate is required to access the endpoints in this API. If set to false, the client-whitelist will be ignored. Defaults to true.
    • client-whitelist contains a list of client certnames that are whitelisted to access the admin API. Any requests made to this endpoint that do not present a valid client cert mentioned in this list will be denied access.
# configuration for the JRuby interpreters

jruby-puppet: {
    gem-home: /var/lib/puppet/jruby-gems
    master-conf-dir: /etc/puppet
    master-var-dir: /var/lib/puppet
    max-active-instances: 1
    max-requests-per-instance: 0

# settings related to HTTP client requests made by Puppet Server
http-client: {
    # A list of acceptable protocols for making HTTP requests
    #ssl-protocols: [TLSv1, TLSv1.1, TLSv1.2]

    # A list of acceptable cipher suites for making HTTP requests.  For more info on available cipher suites, see:
    # http://docs.oracle.com/javase/7/docs/technotes/guides/security/SunProviders.html#SunJSSEProvider
    #cipher-suites: [TLS_RSA_WITH_AES_256_CBC_SHA256,
    #                TLS_RSA_WITH_AES_256_CBC_SHA,
    #                TLS_RSA_WITH_AES_128_CBC_SHA256,
    #                TLS_RSA_WITH_AES_128_CBC_SHA]
    # The amount of time, in milliseconds, that an outbound HTTP connection
    # will wait for data to be available before closing the socket. If not
    # defined, defaults to 20 minutes. If 0, the timeout is infinite and if
    # negative, the value is undefined by the application and governed by the 
    # system default behavior. 
    #idle-timeout-milliseconds: 1200000

    # The amount of time, in milliseconds, that an outbound HTTP connection will
    # wait to connect before giving up. Defaults to 2 minutes if not set. If 0,
    # the timeout is infinite and if negative, the value is undefined in the
    # application and governed by the system default behavior.
    #connect-timeout-milliseconds: 120000

# settings related to profiling the puppet Ruby code
profiler: {
    enabled: true

# Settings related to the puppet-admin HTTP API
puppet-admin: {
    client-whitelist: []


This file contains settings for Puppet master features, such as node identification and authorization.

In a default installation, this file doesn’t exist. You’ll need to create it if you want to set non-default values for these settings.

  • allow-header-cert-info determines whether Puppet Server should use authorization info from the X-Client-Verify, X-Client-CN, and X-Client-Cert HTTP headers. Defaults to false.

    This setting is used to enable external SSL termination. If enabled, Puppet Server will ignore any actual certificate presented to the Jetty webserver, and will rely completely on header data to authorize requests. This is very dangerous unless you’ve secured your network to prevent any untrusted access to Puppet Server.

    You can change Puppet’s ssl_client_verify_header setting to use another header name instead of X-Client-Verify; the ssl_client_header setting can rename X-Client-CN. The X-Client-Cert header can’t be renamed.

    Note that this setting only applies to HTTP endpoints served by the “master” service. The applicable endpoints include those listed in the “Configuration Management Services”, “Informational Services”, and “V2 HTTP API” sections of the Puppet HTTP API page. Note that this setting does not apply to the endpoints listed under the “SSL Certificate Related Services” section of the “Puppet HTTP API” page or to any of the Puppet Admin API endpoints.

master: {
    # allow-header-cert-info: false


This file contains settings for the Certificate Authority service.

  • certificate-status contains settings for the certificate_status HTTP endpoint. This endpoint allows certs to be signed, revoked, and deleted via HTTP requests. This provides full control over Puppet’s security, and access should almost always be heavily restricted. Puppet Enterprise uses this endpoint to provide a cert signing interface in the PE console. For full documentation, see the Certificate Status page.

    • authorization-required determines whether a client certificate is required to access the certificate status endpoints. If set to ‘false’ the whitelist will be ignored. Defaults to true.

    • client-whitelist contains a list of client certnames that are whitelisted to access the certificate_status endpoint. Any requests made to this endpoint that do not present a valid client cert mentioned in this list will be denied access.

# CA-related settings
certificate-authority: {
    certificate-status: {
        authorization-required: true
        client-whitelist: []


This file is set up by packaging and is used to initialize the Ruby load paths for JRuby. The only setting in this file is ruby-load-path. To avoid the risk of loading any gems or other code from your system Ruby, we recommend that you do not modify this file. However, if you must add additional paths to the JRuby load path, you can do so here.

The Ruby load path defaults to the directory where Puppet is installed. In this release, this directory varies depending on what OS you are using.

os-settings: {
    ruby-load-path: ["/usr/lib/ruby/site_ruby/1.8"]


All of Puppet Server’s logging is routed through the JVM Logback library. By default, it logs to /var/log/puppetserver/puppetserver.log (open source releases) or /var/log/pe-puppetserver/puppetserver.log (Puppet Enterprise). The default log level is ‘INFO’. By default, Puppet Server sends nothing to syslog.

The default Logback configuration file is at /etc/puppetserver/logback.xml or /etc/puppetlabs/puppetserver/logback.xml. You can edit this file to change the logging behavior, and/or specify a different Logback config file in global.conf. For more information on configuring Logback itself, see the Logback Configuration Manual. Puppet Server picks up changes to logback.xml at runtime, so you don’t need to restart the service for changes to take effect.

Puppet Server relies on logrotate to manage the log file, and installs a configuration file at /etc/logrotate.d/puppetserver or /etc/logrotate.d/pe-puppetserver.

HTTP Traffic

Puppet Server logs HTTP traffic in a format similar to Apache, and to a separate file than the main log file. By default, this is located at /var/log/puppetserver/puppetserver-access.log (open source releases) and /var/log/pe-puppetserver/puppetserver-access.log (Puppet Enterprise).

By default, the following information is logged for each HTTP request:

  • remote host
  • remote log name
  • remote user
  • date of the logging event
  • URL requested
  • status code of the request
  • response content length
  • remote IP address
  • local port
  • elapsed time to serve the request, in milliseconds

The Logback configuration file is at /etc/puppetserver/request-logging.xml or /etc/puppetlabs/puppetserver/request-logging.xml. You can edit this file to change the logging behavior, and/or specify a different Logback configuration file in webserver.conf with the access-log-config setting. For more information on configuring the logged data, see the Logback Access Pattern Layout.

Service Bootstrapping

Puppet Server is built on top of our open-source Clojure application framework, Trapperkeeper. One of the features that Trapperkeeper provides is the ability to enable or disable individual services that an application provides. In Puppet Server, you can use this feature to enable or disable the CA service, by modifying your bootstrap.cfg file (usually located in /etc/puppetserver/bootstrap.cfg); in that file, you should see some lines that look like this:

# To enable the CA service, leave the following line uncommented
# To disable the CA service, comment out the above line and uncomment the line below

In most cases, you’ll want the CA service enabled. However, if you’re running a multi-master environment or using an external CA, you might want to disable the CA service on some nodes.

Java Secure Socket Extension (JSSE) configuration

A result of the POODLE is that SSLv3 is disabled by default at the JRE layer and in Puppet Server. It is possible to enable Puppet Server to negotiate with SSLv3 clients, however the recommended course of action is to upgrade clients to negotiate using secure protocols.

SSLv3 has been disabled by default in javase 7u75 (1.7.0_u75). See 7u75 Update Release Notes for more information.

To enable SSLv3 at the JRE layer, first create a properties file, e.g. /etc/sysconfig/puppetserver-properties/java.security with the following content:

# Override properties in $JAVA_HOME/jre/lib/security/java.security
# An empty value enables all algorithms including INSECURE SSLv3
# java should be started with
# -Djava.security.properties=/etc/sysconfig/puppetserver-properties/java.security
# for this file to take effect.

Once this property file exists, update JAVA_ARGS, typically defined in /etc/sysconfig/puppetserver with -Djava.security.properties=/etc/sysconfig/puppetserver-properties/java.security. This will configure the JVM to override the jdk.tls.disabledAlgorithms property defined in $JAVA_HOME/jre/lib/security/java.security. The puppetserver service needs to be restarted for this setting to take effect.

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