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NTP Cookbook

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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 TESTING.md file, along with information on how to use this type of testing in your own cookbooks.

Requirements

Supported Operating Systems

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

Cookbooks

  • 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.

Attributes

Recommended tunables

  • 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 support.ntp.org.

  • 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['restrict_default']

  • 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: '192.168.4.0/24') to listen on the last node address on that CIDR.
    • ntp["listen"] can be set to a specific address (eg: '192.168.4.10') 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.

  • ntp["statistics"]

  • Boolean. Default to true. Enable/disable statistics data logging into ntp['statsdir'].
  • Not available on Windows.

  • ntp['conf_restart_immediate']

    • Boolean. Defaults to false. Restarts NTP service immediately after a config update if true. Otherwise it is a delayed restart.

  • ntp['peer']['disable_tinker_panic_on_virtualization_guest'] (applies to virtualized hosts only)

    • Boolean. Defaults to true. Sets tinker panic to 0. NTP default it 1000. (See http://www.vmware.com/vmtn/resources/238 p. 23 for explanation on disabling panic) (Note: this overrides ntp['tinker']['panic'] attribute)

  • ntp['peer']['use_iburst'] (applies to NTP Servers ONLY)

    • Boolean. Defaults to true. Enables iburst in peer declaration.

  • ntp['peer']['use_burst'] (applies to NTP Servers ONLY)

    • Boolean. Defaults to false. Enables burst in peer declaration.

  • ntp['peer']['minpoll'] (applies to NTP Servers ONLY)

    • Boolean. Defaults to 6 (ntp default). Specify the minimum poll intervals for NTP messages, in seconds to the power of two.

  • ntp['peer']['maxpoll'] (applies to NTP Servers ONLY)

    • Boolean. Defaults to 10 (ntp default). Specify the maximum poll intervals for NTP messages, in seconds to the power of two.

  • ntp['server']['prefer'] (applies to NTP Servers and Clients)

    • String. Defaults to emtpy string. The server from ntp['servers'] to prefer getting the time from.

  • ntp['server']['use_iburst'] (applies to NTP Servers and Clients)

    • Boolean. Defaults to true. Enables iburst in server declaration.

  • ntp['server']['use_burst'] (applies to NTP Servers and Clients)

    • Boolean. Defaults to false. Enables burst in server declaration.

  • ntp['server']['minpoll'] (applies to NTP Servers and Clients)

    • Boolean. Defaults to 6 (ntp default). Specify the minimum poll intervals for NTP messages, in seconds to the power of two.

  • ntp['server']['maxpoll'] (applies to NTP Servers and Clients)

    • Boolean. Defaults to 10 (ntp default). Specify the maximum poll intervals for NTP messages, in seconds to the power of two.

  • ntp['tinker']['allan']

    • Number. Defaults to 1500 (ntp default). Spedifies the Allan intercept, which is a parameter of the PLL/FLL clock discipline algorithm, in seconds.

  • ntp['tinker']['dispersion']

    • Number. Defaults to 15 (ntp default). Specifies the dispersion increase rate in parts-per-million (PPM).

  • ntp['tinker']['panic']

    • Number. Defaults to 1000 (ntp default). Spedifies the panic threshold in seconds. If set to zero, the panic sanity check is disabled and a clock offset of any value will be accepted.

  • ntp['tinker']['step']

    • Number. Defaults to 0.128 (ntp default). Spedifies the step threshold in seconds. If set to zero, step adjustments will never occur. Note: The kernel time discipline is disabled if the step threshold is set to zero or greater than 0.5 s.

  • ntp['tinker']['stepout']

    • Number. Defaults to 900 (ntp default). Specifies the stepout threshold in seconds. If set to zero, popcorn spikes will not be suppressed.

  • ntp['localhost']['noquery'] (applies to NTP Servers and Clients)

    • Boolean. Defaults to false. Set to true if using ntp < 4.2.8 or any unpatched ntp version to mitigate CVE-2014-9293 / CVE-2014-9294 / CVE-2014-9295

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.

  • ntp['use_cmos']

    • Boolean, uses a high stratum undisciplined clock for machines with real CMOS clock.
    • Defaults to true unless a platform appears to be virtualized according to Ohai.

Usage

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'
default_attributes(
  'ntp' => {
    'servers' => ['time0.int.example.org', 'time1.int.example.org']
  }
)

Then in an ntpserver.rb role that is applied to NTP servers (e.g., time.int.example.org):

name 'ntp_server'
description 'Role applied to the system that should be an NTP server.'
default_attributes(
  'ntp' => {
    'servers'      => ['0.pool.ntp.org', '1.pool.ntp.org'],
    'peers'        => ['time0.int.example.org', 'time1.int.example.org'],
    'restrictions' => ['10.0.0.0 mask 255.0.0.0 nomodify notrap']
  }
)

The timeX.int.example.org 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.

Development

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

  1. Clone this repository from GitHub:

     $ git clone [email protected]:opscode-cookbooks/ntp.git

  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

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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