ChronyControl

Daily Mac App Updates: 2020-10-08 Application Version Store Type Popularity; Spotify 1.1.43.700.g20acee0f.

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ChronyControl provides a straightforward means fo installing and monitoring chrony, which has now been ported to OS X. The standard installation of OS X includes ntpd, probably the most widely used software for keeping a computer clock synchronised with other computers/clocks on the Internet.
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ChronyControl - install and configure chronyd on macOS

Download

Overview

Files Installed by ChronyControl

ChronyControl

macOS Date & Time

Rotating chronyd logs

ChronyControl Settings

Tracking Graph

Download

ChronyControl 1.4.1 - 18 November, 2020 - Download chronycontrol-1.4.1.zip

Enhancements

Build as a universal binary application including chronyc, chronyd

ChronyControl 1.4.0 - 8 October, 2020 - Download chronycontrol-1.4.0.zip

Enhancements

This is a major release of chrony, with new support for the NTS protocol.

chrony-4.0 has been released. See the chrony changelog for details.

ChronyControl 1.3.3 - 15 May, 2019 - Download chronycontrol-1.3.3.zip

Enhancements

chrony-3.5 has been released.

ChronyControl 1.3.2 - 2 April, 2019 - Download chronycontrol-1.3.2.zip

Enhancements

Compiled with Xcode 10.2, Swift 5.0 for macOS 10.10 or later.
Installation of Swift 5 runtime library no longer required.

Fixed

Possible crash at startup.

ChronyControl 1.3.1 - 28 March, 2019 - Download chronycontrol-1.3.1.zip

Note Running ChronyControl on macOS versions less than 10.14.4 will now require you to manually install the Swift 5 runtime library. You will be prompted when you first launch ChronyControl.

Compiled with Xcode 10.2, Swift 5.0 for macOS 10.10 or later.
ChronyControl is notarized by Apple.
Re-launch if the application has been translocated.

ChronyControl 1.3.0 - 20 September, 2018 - Download chronycontrol-1.3.0.zip

Updated embedded chrony/chronyd to version 3.4.
Compiled with Xcode 10, Swift 4.2 for macOS 10.10 or later.

Chronos Control

ChronyControl 1.2.2 - 14 June, 2018 - Download chronycontrol-1.2.2.zip

Updated embedded chrony/chronyd to version 3.3

ChronyControl 1.2.1 - 16 September, 2017 - Download chronycontrol-1.2.1.zip

Updated embedded chrony to version 3.2
Updated to Swift 4.
Updated for High Sierra.
Fixed crash at start on El Capitan.

ChronyControl 1.1.6 - 31 January, 2017 - Download chronycontrol-1.1.6.zip

Updated embedded chrony to version 3.1

ChronyControl 1.1.5 - 18 January, 2017 - Download chronycontrol-1.1.5.zip

Updated embedded chrony to version 3.0

ChronyControl 1.1.4 - 22 November, 2016 - Download chronycontrol-1.1.4.zip

Updated embedded chrony to version 2.4.1
Compiled with Xcode 8.1

ChronyControl 1.1.3 - 7 June, 2016 - Download chronycontrol-1.1.3.zip

Updated embedded chrony to version 2.4.

ChronyControl 1.1.2 - 17 Feb, 2016 - Download chronycontrol-1.1.2.zip

Updated embedded chrony to version 2.3.
Fixed directory ownership when chronyd user is changed.

ChronyControl 1.1.1 - 16 Feb, 2016 - Download chronycontrol-1.1.1.zip

Fix unexpected quit if chrony config file has not been installed

ChronyControl 1.1.0 - 11 Feb, 2016 - Download chronycontrol-1.1.0.zip

chrony snapshot git 2.3-pre1-8-g910663c.
Included Sparkle framework for future updates.
Set chrony file locations (configuration and executables in preferences.
This should allow ChronyControl to work with chrony installed manually or via Macports
Configuration file editor embedded.
Preliminary version of offset spectral analysis.
Interface overhaul

ChronyControl 1.0.0 - Download chronycontrol-1.0.0.zip

Initial release - embedded chrony software is current (19 August, 2015) git snapshot

Overview

macOS includes ntpd, probably the most widely used software for keeping a computer clock synchronised with other computers/clocks on the internet. However, unless the Mac is online for extended periods of time, ntpd can be very slow to synchronise with other clocks and the system time may be at wild variance with true time.
The chrony software addresses the issues associated with ntpd. This is fully explained in the FAQ
chrony has now been ported to MacOS X, and I have written a tool, ChronyControl, that will provide a straight forward means of installing and monitoring the daemon.

Files Installed by ChronyControl

Chrono Controller

ChronyControl will install the chrony software and associated files on your Macintosh

chronyd - /usr/local/bin
chronyc - /usr/local/bin
chronylogrotate.sh - /usr/local/bin
chrony.conf - /etc/chrony.d/chrony.conf
launchd plist - /Library/LaunchDaemons/org.tuxfamily.chronyd.plist
launchd plist - /Library/LaunchDaemons/org.tuxfamily.chronyc.plist
privileged helper - /Library/PrivilegedHelperTools/net.whatroute.chronycontrol

After installation you can also monitor and configure the chrony software from the command line, as you would on any other Unix system. The commands are documented at the chrony website.

ChronyControl

ChronyControl is primarily a front end to the chronyc tool delivered with the chrony software. It can show the overall server performance (tracking) and the state of individual remote time servers
ChronyControl bundles the most recent version of chrony (chronyc and chronyd) and, via the Settings button, can configure and install chronyd.
The upper clock displays the current time of your Mac. The centre hub of the clock will be red if chronyd is not running, orange if the daemon is running but is in an unsynchronised state, and green when chronyd is synchronised and disciplining the system clock.
The chronyc popup button enables you choose between the tracking, sources and sourcestats chronyc commands.
The popup button labeled Last offset below the performance meter in the screenshot, sends the corresponding value from the output of the tracking command to the meter.
Click the padlock icon (you'll be prompted for your login/password) to enable the Settings button.

MacOS X Date & Time

ChronyControl will disable 'Set date and time automatically' in the System Preferences 'Date & Time' panel. This terminates the ntpd daemon and prevents it from running. If you re-enable the setting, there is no guarantee as to which daemon, ntpd or chronyd, will be disciplining the system clock. Should you wish to go back to using ntpd, you should Uninstall chronyd (see below in ChronyControl Settings) before re-enabling the option in System Preferences.

Rotating chronyd logs

Chrony Remote Control

chronyd will (by default although this may be adjusted in the chrony.conf settings file) store statistics to the log files in the directory /var/log/chrony . ChronyControl installs a launchd job to rotate these logs on a daily basis, deleting the oldest (10 days) files.

ChronyControl Settings

Chrony Access Control

These are privileged operations. You must first authenticate by pressing the small padlock in the lower left corner of the window in order to be able to use the Settings button to display the following window.
Responses from the privileged helper to your button presses will be shown in the text field, Helper Response
You may be further prompted for your login/password when you click the buttons if the smaller 'helper' program has not yet been installed or is to be updated.

Button	Description
Edit Configuration	Open the chronyd configuration file in the TextEdit editor. It's a plain text file and must not be changed to any other format. At the top of the file is a default set of ntp servers. These may be changed to your preferred servers. A detailed description of the attributes used in the configuration file can be found at the chrony site WARNING You should not change any of the other attributes, file paths or directories specified in the file. The launchd configuration files installed by ChronyControl assume that files will be located at the paths specified in the distributed configuration. This restriction will become more flexible in a later release of ChronyControl.
Install Configuration	Copy the configuration file to /etc/chrony.d/chrony.conf
Install chronyd	Install chronyd to /usr/local/sbin and a launchd plist to automate starting chronyd Install chronyc in /usr/local/bin Install chronylogrotate.sh to /usr/local/bin and a launchd plist to run the script on a daily basis
Uninstall chronyd	Stop the daemon (if its running) and remove the components installed above
Stop chronyd	Terminate the chronyd daemon
Start chronyd	ummmmm .....
Dismiss	Close the Settings window and return to the main ChronyControl screen

Tracking Graphs

The values shown in the tracking display can be displayed graphically as shown in the screen shots below. Select Tracking from the Windows menu to display the graphs.

The source of data for these graphs is the log file /var/log/chrony/tracking.log

The graph is updated in real time as chronyd adds records to the log file.

Explanation of the colours and data range settings can be seen by clicking the Legend button as shown in the second screen shot.

Controls on the right hand side can be used to zoom/re-scale the graph for either finer granularity or to gain an overview of the data.

Exposing the Legend control.

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