Version information
released Dec 13th 2018
This version is compatible with:
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blackknight36/chrony — version 0.2.4 Dec 13th 2018
chrony
Table of Contents
- Overview
- Module Description - What the module does and why it is useful
- Setup - The basics of getting started with chrony
- Usage - Configuration options and additional functionality
- Limitations - OS compatibility, etc.
- Development - Guide for contributing to the module
Overview
This module manages the chrony NTP client/server daemon. It is capable of trivial NTP client-only setups all the way up to stratum 1 servers connected to reference clocks.
Module Description
The chrony module configures chronyd to act as an NTP client, server, or both. It also can install or remove the chrony package, and enable or disable the chrony service.
Setup
What chrony affects
- Installs and removes the chrony package
- Starts and stops the chrony service
- Manages /etc/chrony/chrony.conf or /etc/chrony.conf
- Manages /var/lib/chrony
- Manages /var/log/chrony
Setup Requirements
On most systems, chrony has no special requirements.
On Enterprise Linux 6 or older systems, the EPEL repository is required. I recommend using the stahnma/epel module as this is the official module from the EPEL package maintainer. EPEL is not required on Enterprise Linux 7.
Beginning with chrony
The very basic steps needed for a user to get the module up and running.
The minimum you need to begin using chrony as an NTP client to public NTP servers is something like:
class profile::ntp_client {
class { '::chrony': }
}
The minimum you need to serve NTP to your local network is:
class profile::ntp_server {
class { '::chrony':
client_allow => '192.168.0.0/16',
serve_ntp => true,
}
}
Usage
This module provides a chrony class which accepts the following parameters.
General parameters
[bindcmdaddress]
Restrict the network interface to which chronyd will listen for command packets (issued by chronyc).
Default: [ '127.0.0.1', '::1' ]
[rtconutc]
Whether the computer's onboard real-time clock is set to UTC. Set to false if the RTC is in local time, such as a system which boots multiple operating systems.
Default: true
[sync_local_clock]
Keep the computer's hardware clock in sync.
Default: true
NTP client parameters
[offline]
Whether the NTP client should start in offline mode. In this mode, clients must issue the chronyc online command to begin synchronization (though most systems with a GUI will manage to do this automatically). Useful for laptops and other intermittently connected devices.
Default: false
[servers]
A list of NTP servers and options for those servers. (It is not necessary to specify the offline option; this can be done with the offline parameter.)
Default: Array of public NTP servers, depending on $::osfamily
[source_port]
Select a fixed source port for outgoing NTP packets. By default, the source port is dynamically assigned by the operating system.
Default: undef
NTP server parameters
[client_allow]
Designate subnets from which NTP clients are allowed to access the computer as an NTP server. IPv4 and IPv6 CIDR ranges can be specified.
Default: []
[client_deny]
Designate subnets within previously allowed subnets which are denied to access the NTP server. IPv4 and IPv6 CIDR ranges can be specified.
Default: []
[client_log]
Whether to log statistics about NTP clients.
Default: false
[refclock]
Specify one or more reference clocks to which chrony should obtain time information to act as a stratum 1 server. See the chrony documentation for details.
Default: []
[serve_ntp]
Whether to enable the NTP server functionality. If disabled, chrony will act only as an NTP client.
Default: false
[udlc]
Allow the server to operate without synchronization to an external time source (undisciplined local clock).
Default: false
Limitations
This module currently only works with Debian, Redhat, Arch Linux, and Gentoo based systems. Testing has been done on the following platforms.
- Debian (6/squeeze, 7/wheezy)
- Ubuntu (10.04, 12.04, 14.04)
- CentOS/RHEL (6, 7)
- Fedora (19-29)
- Arch Linux (3.16.1)
- Gentoo (Base System 2.2)
Development
This module is by no means complete. Pull requests are welcome for:
- Bug fixes
- Additional operating system support
- Additional chrony feature support
- Anything else that makes sense
Release 0.0.1
Summary
Adds several new features and updates
Features
- Deprecation function X in favor of Y.
- Updated Gemfile to deal with parallel_tests Ruby dependancy
Bugfixes
- README typo fixes.
- Updates deprecation tests to include future parser.
This changelog is used track changes with this module in human readable format. Feel free to reference tickets with links or other important information the reader would find useful when determining the level of risk with upgrading. For more information on changelogs please see the keeping a changelog site.
Dependencies
- puppetlabs/stdlib (>= 3.2.0 < 5.0.0)
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version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
{one line to give the program's name and a brief idea of what it does.}
Copyright (C) {year} {name of author}
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
{project} Copyright (C) {year} {fullname}
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.