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ntp (90) Versions 1.6.8

Installs and configures ntp as a client or server

cookbook 'ntp', '= 1.6.8', :supermarket
cookbook 'ntp', '= 1.6.8'
knife supermarket install ntp
knife supermarket download ntp
Quality 0%

NTP Cookbook

Build Status

Installs and configures ntp. On Windows systems it uses the Meinberg port of the standard NTPd client to Windows.

About Testing

In addition to providing interfaces to the ntp time service, this recipe is also designed to provide a simple community cookbook with broad cross-platform support to serve as a testing documentation reference. This cookbook utilizes Foodcritic, Test-Kitchen, Vagrant, Chefspec, bats, Rubocop, and Travis-CI to provide a comprehensive suite of automated test coverage.

More information on the testing strategy used in this cookbook is available in the file, along with information on how to use this type of testing in your own cookbooks.


Supported Operating Systems

  • Debian-family Linux Distributions
  • RedHat-family Linux Distributions
  • Gentoo Linux
  • FreeBSD
  • Windows


  • When running on Windows based systems, the node must include the Windows cookbook. This cookbook suggests the Windows cookbook in the metadata so as to not force inclusion of the Windows cookbook on *nix systems. Change 'suggests' to 'depends' if you require Windows platform support.


  • ntp['servers'] - (applies to NTP Servers and Clients)
    • Array, should be a list of upstream NTP servers that will be considered authoritative by the local NTP daemon. The local NTP daemon will act as a client, adjusting local time to match time data retrieved from the upstream NTP servers.

The NTP protocol works best with at least 4 servers. The ntp daemon will disregard any server after the 10th listed, but will continue monitoring all listed servers. For more information, see Upstream Server Time Quantity at

  • ntp['peers'] - (applies to NTP Servers ONLY)

  • ntp['restrictions'] - (applies to NTP Servers only)

    • Array, should be a list of restrict lines to define access to NTP clients on your LAN.
  • ntp['sync_clock'] (applies to NTP Servers and Clients)

    • Boolean. Defaults to false. Forces the ntp daemon to be halted, an ntp -q command to be issued, and the ntp daemon to be restarted again on every Chef-client run. Will have no effect if drift is over 1000 seconds.
  • ntp['sync_hw_clock'] (applies to NTP Servers and Clients)

    • Boolean. Defaults to false. On *nix-based systems, forces the 'hwclock --systohc' command to be issued on every Chef-client run. This will sync the hardware clock to the system clock.
    • Not available on Windows.
  • ntp["listen_network"] / ntp["listen"]

    • String, optional attribute. Default is for NTP to listen on all addresses.
    • ntp["listen_network"] should be set to 'primary' to listen on the node's primary IP address as determined by ohai, or set to a CIDR (eg: '') to listen on the last node address on that CIDR.
    • ntp["listen"] can be set to a specific address (eg: '') instead of ntp["listen_network"] to force listening on a specific address.
    • If both ntp["listen"] and ntp["listen_network"] are set then ntp["listen"] will always win.

Platform specific

  • ntp['packages']

    • Array, the packages to install
    • Default, ntp for everything, ntpdate depending on platform. Not applicable for Windows nodes
  • ntp['service']

    • String, the service to act on
    • Default, ntp, NTP, or ntpd, depending on platform
  • ntp['varlibdir']

    • String, the path to /var/lib files such as the driftfile.
    • Default, platform-specific location. Not applicable for Windows nodes
  • ntp['driftfile']

    • String, the path to the frequency file.
    • Default, platform-specific location.
  • ntp['conffile']

    • String, the path to the ntp configuration file.
    • Default, platform-specific location.
  • ntp['statsdir']

    • String, the directory path for files created by the statistics facility.
    • Default, platform-specific location. Not applicable for Windows nodes
  • ntp['conf_owner'] and ntp['conf_group']

    • String, the owner and group of the sysconf directory files, such as /etc/ntp.conf.
    • Default, platform-specific root:root or root:wheel.
  • ntp['var_owner'] and ntp['var_group']

    • String, the owner and group of the /var/lib directory files, such as /var/lib/ntp.
    • Default, platform-specific ntp:ntp or root:wheel. Not applicable for Windows nodes
  • ntp['leapfile']

    • String, the path to the ntp leapfile.
    • Default, /etc/ntp.leapseconds.
  • ntp['package_url']

    • String, the URL to the the Meinberg NTPd client installation package.
    • Default, Meinberg site download URL
    • Windows platform only
  • ntp['vs_runtime_url']

    • String, the URL to the the Visual Studio C++ 2008 runtime libraries that are required for the Meinberg NTP client.
    • Default, Microsoft site download URL
    • Windows platform only
  • ntp['vs_runtime_productname']

    • String, the installation name of the Visual Studio C++ Runtimes file.
    • Default, "Microsoft Visual C++ 2008 Redistributable - x86 9.0.21022"
    • Windows platform only
  • ntp['sync_hw_clock']

    • Boolean, determines if the ntpdate command is issued to sync the hardware clock
    • Default, false
    • Not applicable for Windows nodes
  • ntp['apparmor_enabled']

    • Boolean, enables configuration of apparmor if set to true
    • Defaults to false and will make no provisions for apparmor. If a platform is apparmor enabled by default, (currently Ubuntu) default will be true.


default recipe

Set up the ntp attributes in a role. For example in a base.rb role applied to all nodes:

name 'base'
description 'Role applied to all systems'
  'ntp' => {
    'servers' => ['', '']

Then in an ntpserver.rb role that is applied to NTP servers (e.g.,

name 'ntp_server'
description 'Role applied to the system that should be an NTP server.'
  'ntp' => {
    'is_server'    => 'true',
    'servers'      => ['', ''],
    'peers'        => ['', ''],
    'restrictions' => [' mask nomodify notrap']

The used in these roles should be the names or IP addresses of internal NTP servers. Then simply add ntp, or ntp::default to your run_list to apply the ntp daemon's configuration.

undo recipe

If for some reason you need to stop and remove the ntp daemon, you can apply this recipe by adding ntp::undo to your run_list. The undo recipe is not supported on Windows at the moment.

windows_client recipe

Windows only. Apply on a Windows host to install the Meinberg NTPd client.


This section details "quick development" steps. For a detailed explanation, see [[]].

  1. Clone this repository from GitHub:

    $ git clone
  2. Create a git branch

    $ git checkout -b my_bug_fix
  3. Install dependencies:

    $ bundle install
  4. Write tests

  5. Make your changes/patches/fixes, committing appropriately

  6. Run the tests:

    • bundle exec rake
    • bundle exec rake kitchen

In detail:
- Foodcritic will catch any Chef-specific style errors
- RSpec will run the unit tests
- Rubocop will check for Ruby-specific style errors
- Test Kitchen will run and converge the recipes

License & Authors

Copyright 2009-2013, Opscode, Inc.
Copyright 2012, Eric G. Wolfe
Copyright 2012, Fletcher Nichol
Copyright 2012, Webtrends, Inc.
Copyright 2013, Limelight Networks, Inc.
Copyright 2013, Brad Knowles
Copyright 2013, Brad Beam

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.

Dependent cookbooks

This cookbook has no specified dependencies.

Contingent cookbooks

base_install Applicable Versions
baseserver Applicable Versions
cafe-core Applicable Versions
cdap Applicable Versions
chef-manageiq Applicable Versions
circonus-broker Applicable Versions
cloudless-box Applicable Versions
common_linux Applicable Versions
eucalyptus Applicable Versions
firstbook Applicable Versions
il-base Applicable Versions
kagent Applicable Versions
krb5 Applicable Versions
kvm Applicable Versions
linux-basic Applicable Versions
linux_basic Applicable Versions
mw_server_base Applicable Versions
my_cookbook Applicable Versions
ntp_cluster Applicable Versions
os-hardening Applicable Versions
paramount Applicable Versions
platformstack Applicable Versions
privx Applicable Versions
sanity Applicable Versions
server-base Applicable Versions
stack-base Applicable Versions

ntp Cookbook CHANGELOG

This file is used to list changes made in each version of the ntp cookbook.

v1.6.8 (2014-12-04)

  • PR #81 - Update to berkshelf3

v1.6.6 (2014-12-02)

  • PR #76 - Overhauled Testing
  • PR #68 - Updated Leapseconds
  • PR #51 - Berksfile source deprecation

v1.6.5 (2014-09-25)

  • Ensure that ntp version is captured

v1.6.4 (2014-07-02)

  • Leapseconds File Expired, update to 3626380800
  • COOK-3887 - Trivial changes to achieve Gentoo support
  • COOK-1876 - ntp leapfile assumes ntpd >= 4.2.6 syntax

v1.6.2 (2014-03-19)

  • [COOK-4162] - change "No NTP servers specified" message to :debug

v1.6.0 (2014-02-21)



  • COOK-4106 - Check for default content in ntp.conf
  • COOK-4087 - quote option in readme
  • COOK-3797 - Cookbook fails to upload due to 1.9.x syntax
  • COOK-3023 - NTP leapseconds file denied by Ubuntu apparmor profile

v1.5.4 (2013-12-29)

[COOK-4007]- update to 3612902400





New Feature

  • COOK-3636 - Allow ntp cookbook to update clock to ntp servers


  • COOK-3410 - Remove redundant ntpdate/disable recipes
  • COOK-1170 - Allow redefining NTP servers in a role



  • COOK-3365 - Update ntp leapseconds file to version 3597177600
  • COOK-1674 - Add Windows support


  • [COOK-2024] - update leapfile for IERS Bulletin C


  • [COOK-1404] - add leapfile for handling leap seconds


  • [COOK-1184] - Add recipe to disable NTP completely
  • [COOK-1298] - Refactor into a reference cookbook for testing


  • [COOK-1158] - RHEL family >= 6 has ntpdate package


  • Related to changes in COOK-1124, fix group for freebsd and else


  • [COOK-1124] - parameterised driftfile and statsdir to be configurable by platform


  • [COOK-952] - freebsd support
  • [COOK-949] - check for any virtual system not just vmware


  • Fixes COOK-376 (use LAN peers, iburst option, LAN restriction attribute)


  • Support scientific linux
  • Use service name attribute in resource (fixes EL derivatives)

Foodcritic Metric

1.6.8 failed this metric

FC031: Cookbook without metadata file: /tmp/cook/253e7b1680967f87c8b9f678/ntp/metadata.rb:1
FC045: Consider setting cookbook name in metadata: /tmp/cook/253e7b1680967f87c8b9f678/ntp/metadata.rb:1