NTP - Revision history

Leo at 19:30, 30 March 2020

2020-03-30T19:30:51Z

← Older revision		Revision as of 19:30, 30 March 2020
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	To query a NTP server, use the {{code\|ntpdc}} command.		To query a NTP server, use the {{code\|ntpdc}} command.

			See [[Chrony]] for more information on the new NTP client/server used in Red Hat 8 / CentOS 8 or higher.

	== NTP Monlist ==		== NTP Monlist ==

2019-09-01T06:32:48Z

← Older revision		Revision as of 06:32, 1 September 2019
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			The Network Time Protocol or NTP is a protocol to reliably obtain the current time from remote servers.

	To query a NTP server, use the {{code\|ntpdc}} command.		To query a NTP server, use the {{code\|ntpdc}} command.

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	{{Navbox Linux}}[[Category:Linux]]		{{Navbox Linux}}[[Category:Linux]]

	{{Navbox Services}}		{{Navbox Services}}

2019-09-01T06:22:47Z

Text replacement - "Category:Linux{{Navbox Linux}}" to "{{Navbox Linux}}Category:Linux"

← Older revision		Revision as of 06:22, 1 September 2019
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	On the server, force a sync by running {{code\|ntpdate -b timeserver}}.		On the server, force a sync by running {{code\|ntpdate -b timeserver}}.

	[[Category:Linux]]~~{{Navbox Linux}}~~		{{Navbox Linux}}[[Category:Linux]]

	{{Navbox Services}}		{{Navbox Services}}

2019-09-01T05:10:38Z

Text replacement - "{{Navbox Linux}}{{Navbox Linux}}" to "{{Navbox Linux}}"

← Older revision		Revision as of 05:10, 1 September 2019
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	On the server, force a sync by running {{code\|ntpdate -b timeserver}}.		On the server, force a sync by running {{code\|ntpdate -b timeserver}}.

	[[Category:Linux]]~~{{Navbox Linux}}~~{{Navbox Linux}}		[[Category:Linux]]{{Navbox Linux}}

	{{Navbox Services}}		{{Navbox Services}}

2019-09-01T05:07:25Z

Text replacement - "Category:Linux" to "Category:Linux{{Navbox Linux}}"

← Older revision		Revision as of 05:07, 1 September 2019
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	On the server, force a sync by running {{code\|ntpdate -b timeserver}}.		On the server, force a sync by running {{code\|ntpdate -b timeserver}}.

	[[Category:Linux]]{{Navbox Linux}}		[[Category:Linux]]{{Navbox Linux}}{{Navbox Linux}}

	{{Navbox Services}}		{{Navbox Services}}

2019-09-01T03:32:48Z

Text replacement - "Category:Linux " to "Category:Linux{{Navbox Linux}} "

← Older revision		Revision as of 03:32, 1 September 2019
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	On the server, force a sync by running {{code\|ntpdate -b timeserver}}.		On the server, force a sync by running {{code\|ntpdate -b timeserver}}.

	[[Category:Linux]]		[[Category:Linux]]{{Navbox Linux}}

	{{Navbox Services}}		{{Navbox Services}}

2017-04-02T01:23:40Z

Systemd

← Older revision		Revision as of 01:23, 2 April 2017
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	If you get		If you get this error:
	{{highlight\|lang=terminal\|code=		{{highlight\|lang=terminal\|code=
	# timedatectl set-ntp true		# timedatectl set-ntp true
	Failed to set ntp: Failed to activate service 'org.freedesktop.timedate1': timed out (service_start_timeout=25000ms)		Failed to set ntp: Failed to activate service 'org.freedesktop.timedate1': timed out (service_start_timeout=25000ms)
	}}		}}
	~~that~~ means you're missing the NTP package.		It means you're missing the NTP package. Install NTP and try again.

	If systemd's just going to use the NTP service through this timedate abstraction, why wouldn't one just run ntp directly instead of dealing with systemd?		Question: If systemd's just going to use the NTP service through this timedate abstraction, why wouldn't one just run ntp directly instead of dealing with systemd?

	See Also:		See Also:

2017-04-02T01:23:00Z

Systemd

← Older revision		Revision as of 01:23, 2 April 2017
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	== Systemd ==		== Systemd ==
	You can also ~~sync~~ time ~~with systemd~~. To enable, run:		You can also get systemd to handle time syncing using NTP. To enable, run:

	{{highlight\|lang=terminal\|code=		{{highlight\|lang=terminal\|code=
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	}}		}}


			If you get
			{{highlight\|lang=terminal\|code=
			# timedatectl set-ntp true
			Failed to set ntp: Failed to activate service 'org.freedesktop.timedate1': timed out (service_start_timeout=25000ms)
			}}
			that means you're missing the NTP package.

			If systemd's just going to use the NTP service through this timedate abstraction, why wouldn't one just run ntp directly instead of dealing with systemd?

	See Also:		See Also:
	* https://wiki.archlinux.org/index.php/systemd-timesyncd		* https://wiki.archlinux.org/index.php/systemd-timesyncd


	== Troubleshooting ==		== Troubleshooting ==

2017-03-24T18:36:47Z

← Older revision		Revision as of 18:36, 24 March 2017
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	To see the peers of the local server, run:		To see the peers of the local server, run:
	ntpdc -c monlist		{{highlight\|lang=terminal\|code=
			$ ntpdc -c monlist
			}}

	You can also try querying a remote server by running:		You can also try querying a remote server by running:
	ntpdc -c monlist IP
			{{highlight\|lang=terminal\|code=
			$ ntpdc -c monlist IP
			}}

	== NTP Peers ==		== NTP Peers ==

	To see the peers of a server, run:		To see the peers of a server, run:
	ntpq -pn
			{{highlight\|lang=terminal\|code=
			$ ntpq -pn
			}}

	== NTP Synchronization ==		== NTP Synchronization ==

	To sync with a server, run:		To sync with a server, run:
	ntpdate 136.159.5.75
			{{highlight\|lang=terminal\|code=
			$ ntpdate 136.159.5.75
			}}

	You can get debug information with the {{code\|-dv}} option:		You can get debug information with the {{code\|-dv}} option:
	ntpdate -dv 136.159.5.75
			{{highlight\|lang=terminal\|code=
			$ ntpdate -dv 136.159.5.75
			}}

			== Systemd ==
			You can also sync time with systemd. To enable, run:

			{{highlight\|lang=terminal\|code=
			## Edit the config at /etc/systemd/timesyncd.conf
			# vi /etc/systemd/timesyncd.conf

			## Enable
			# timedatectl set-ntp true

			## Check status
			# timedatectl status
			}}


			See Also:
			* https://wiki.archlinux.org/index.php/systemd-timesyncd


	== Troubleshooting ==		== Troubleshooting ==

2017-02-24T19:14:31Z

Text replacement - "</code>" to "}}"

← Older revision		Revision as of 19:14, 24 February 2017
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	To query a NTP server, use the {{code\|ntpdc~~</code>~~ command.		To query a NTP server, use the {{code\|ntpdc}} command.

	== NTP Monlist ==		== NTP Monlist ==
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	ntpdate 136.159.5.75		ntpdate 136.159.5.75

	You can get debug information with the {{code\|-dv~~</code>~~ option:		You can get debug information with the {{code\|-dv}} option:
	ntpdate -dv 136.159.5.75		ntpdate -dv 136.159.5.75