diff options
Diffstat (limited to 'upstream/fedora-40/man5/timesyncd.conf.5')
| -rw-r--r-- | upstream/fedora-40/man5/timesyncd.conf.5 | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/upstream/fedora-40/man5/timesyncd.conf.5 b/upstream/fedora-40/man5/timesyncd.conf.5 new file mode 100644 index 00000000..33f0675d --- /dev/null +++ b/upstream/fedora-40/man5/timesyncd.conf.5 @@ -0,0 +1,140 @@ +'\" t +.TH "TIMESYNCD\&.CONF" "5" "" "systemd 255" "timesyncd.conf" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +timesyncd.conf, timesyncd.conf.d \- Network Time Synchronization configuration files +.SH "SYNOPSIS" +.PP +/etc/systemd/timesyncd\&.conf +.PP +/etc/systemd/timesyncd\&.conf\&.d/*\&.conf +.PP +/run/systemd/timesyncd\&.conf\&.d/*\&.conf +.PP +/usr/lib/systemd/timesyncd\&.conf\&.d/*\&.conf +.SH "DESCRIPTION" +.PP +These configuration files control NTP network time synchronization\&. See +\fBsystemd.syntax\fR(7) +for a general description of the syntax\&. +.SH "CONFIGURATION DIRECTORIES AND PRECEDENCE" +.PP +The default configuration is set during compilation, so configuration is only needed when it is necessary to deviate from those defaults\&. The main configuration file is either in +/usr/lib/systemd/ +or +/etc/systemd/ +and contains commented out entries showing the defaults as a guide to the administrator\&. Local overrides can be created by creating drop\-ins, as described below\&. The main configuration file can also be edited for this purpose (or a copy in +/etc/ +if it\*(Aqs shipped in +/usr/) however using drop\-ins for local configuration is recommended over modifications to the main configuration file\&. +.PP +In addition to the "main" configuration file, drop\-in configuration snippets are read from +/usr/lib/systemd/*\&.conf\&.d/, +/usr/local/lib/systemd/*\&.conf\&.d/, and +/etc/systemd/*\&.conf\&.d/\&. Those drop\-ins have higher precedence and override the main configuration file\&. Files in the +*\&.conf\&.d/ +configuration subdirectories are sorted by their filename in lexicographic order, regardless of in which of the subdirectories they reside\&. When multiple files specify the same option, for options which accept just a single value, the entry in the file sorted last takes precedence, and for options which accept a list of values, entries are collected as they occur in the sorted files\&. +.PP +When packages need to customize the configuration, they can install drop\-ins under +/usr/\&. Files in +/etc/ +are reserved for the local administrator, who may use this logic to override the configuration files installed by vendor packages\&. Drop\-ins have to be used to override package drop\-ins, since the main configuration file has lower precedence\&. It is recommended to prefix all filenames in those subdirectories with a two\-digit number and a dash, to simplify the ordering of the files\&. This also defined a concept of drop\-in priority to allow distributions to ship drop\-ins within a specific range lower than the range used by users\&. This should lower the risk of package drop\-ins overriding accidentally drop\-ins defined by users\&. +.PP +To disable a configuration file supplied by the vendor, the recommended way is to place a symlink to +/dev/null +in the configuration directory in +/etc/, with the same filename as the vendor configuration file\&. +.SH "OPTIONS" +.PP +The following settings are configured in the [Time] section: +.PP +\fINTP=\fR +.RS 4 +A space\-separated list of NTP server host names or IP addresses\&. During runtime this list is combined with any per\-interface NTP servers acquired from +\fBsystemd-networkd.service\fR(8)\&. +\fBsystemd\-timesyncd\fR +will contact all configured system or per\-interface servers in turn, until one responds\&. When the empty string is assigned, the list of NTP servers is reset, and all prior assignments will have no effect\&. This setting defaults to an empty list\&. +.sp +Added in version 216\&. +.RE +.PP +\fIFallbackNTP=\fR +.RS 4 +A space\-separated list of NTP server host names or IP addresses to be used as the fallback NTP servers\&. Any per\-interface NTP servers obtained from +\fBsystemd-networkd.service\fR(8) +take precedence over this setting, as do any servers set via +\fINTP=\fR +above\&. This setting is hence only relevant if no other NTP server information is known\&. When the empty string is assigned, the list of NTP servers is reset, and all prior assignments will have no effect\&. If this option is not given, a compiled\-in list of NTP servers is used\&. +.sp +Added in version 216\&. +.RE +.PP +\fIRootDistanceMaxSec=\fR +.RS 4 +Maximum acceptable root distance, i\&.e\&. the maximum estimated time required for a packet to travel to the server we are connected to from the server with the reference clock\&. If the current server does not satisfy this limit, +\fBsystemd\-timesyncd\fR +will switch to a different server\&. +.sp +Takes a time span value\&. The default unit is seconds, but other units may be specified, see +\fBsystemd.time\fR(5)\&. Defaults to 5 seconds\&. +.sp +Added in version 236\&. +.RE +.PP +\fIPollIntervalMinSec=\fR, \fIPollIntervalMaxSec=\fR +.RS 4 +The minimum and maximum poll intervals for NTP messages\&. Polling starts at the minimum poll interval, and is adjusted within the specified limits in response to received packets\&. +.sp +Each setting takes a time span value\&. The default unit is seconds, but other units may be specified, see +\fBsystemd.time\fR(5)\&. +\fIPollIntervalMinSec=\fR +defaults to 32 seconds and must not be smaller than 16\ \&seconds\&. +\fIPollIntervalMaxSec=\fR +defaults to 34\ \&min\ \&8\ \&s (2048\ \&seconds) and must be larger than +\fIPollIntervalMinSec=\fR\&. +.sp +Added in version 236\&. +.RE +.PP +\fIConnectionRetrySec=\fR +.RS 4 +Specifies the minimum delay before subsequent attempts to contact a new NTP server are made\&. +.sp +Takes a time span value\&. The default unit is seconds, but other units may be specified, see +\fBsystemd.time\fR(5)\&. Defaults to 30 seconds and must not be smaller than 1 second\&. +.sp +Added in version 248\&. +.RE +.PP +\fISaveIntervalSec=\fR +.RS 4 +The interval at which the current time is periodically saved to disk, in the absence of any recent synchronisation from an NTP server\&. This is especially useful for offline systems with no local RTC, as it will guarantee that the system clock remains roughly monotonic across reboots\&. +.sp +Takes a time interval value\&. The default unit is seconds, but other units may be specified, see +\fBsystemd.time\fR(5)\&. Defaults to 60 seconds\&. +.sp +Added in version 250\&. +.RE +.SH "SEE ALSO" +.PP +\fBsystemd\fR(1), +\fBsystemd-timesyncd.service\fR(8), +\fBsystemd-networkd.service\fR(8) |