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user528025
Asked: 2024-11-30 05:39:52 +0800 CST

timedatectl 在哪里获取其初始值？

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我正在研究如何在 Ubuntu 22.04 中同步时间。与任何 systemd 控制的系统一样，该服务正在使用systemd-timesyncd。

根据文档，启动时，systemd-timesyncd 将从以下位置读取配置文件/etc/systemd/timesyncd.conf

不可能，/etc/systemd/timesyncd.conf因为其中的所有值都被注释掉了：

#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it under the
#  terms of the GNU Lesser General Public License as published by the Free
#  Software Foundation; either version 2.1 of the License, or (at your option)
#  any later version.
#
# Entries in this file show the compile time defaults. Local configuration
# should be created by either modifying this file, or by creating "drop-ins" in
# the timesyncd.conf.d/ subdirectory. The latter is generally recommended.
# Defaults can be restored by simply deleting this file and all drop-ins.
#
# See timesyncd.conf(5) for details.

[Time]
#NTP=
#FallbackNTP=ntp.ubuntu.com
#RootDistanceMaxSec=5
#PollIntervalMinSec=32
#PollIntervalMaxSec=2048

所有内容都注释掉了，但当我查询 timedatectl 时，我可以看到 npt 等的值。老天爷，我真不明白 timesync 是如何获得它的值的。

># timedatectl show-timesync
FallbackNTPServers=ntp.ubuntu.com
ServerName=ntp.ubuntu.com
ServerAddress=185.125.190.56
RootDistanceMaxUSec=5s
PollIntervalMinUSec=32s
PollIntervalMaxUSec=34min 8s
PollIntervalUSec=32s
NTPMessage={ Leap=0, Version=4, Mode=4, Stratum=2, Precision=-25, RootDelay=1.129ms, RootDispersion=213us, Reference=11FD1CFD, OriginateTimestamp=Fri 2024-11-29 21:22:30 GMT, ReceiveTimestamp=Fri 2024-11-29 21:22:33 GMT, TransmitTimestamp=Fri 2024-11-29 21:22:33 GMT, DestinationTimestamp=Fri 2024-11-29 21:22:30 GMT, Ignored=no PacketCount=656, Jitter=252.712ms }

据我所知，提到的其余 conf 文件均不存在。在我发疯之前，有什么想法吗？

server

1 个回答

  1. Best Answer

    后备 NTP 服务器是在构建时设置的，请参阅中的定义DEFAULT_NTP_SERVERSdebian/rules：

    ifeq ($(DEB_VENDOR),Ubuntu)
    DEFAULT_NTP_SERVERS = ntp.ubuntu.com
    SUPPORT_URL = http://www.ubuntu.com/support
    CONFFLAGS_DISTRO =
else
    DEFAULT_NTP_SERVERS = 0.debian.pool.ntp.org 1.debian.pool.ntp.org 2.debian.pool.ntp.org 3.debian.pool.ntp.org
    SUPPORT_URL = https://www.debian.org/support
    CONFFLAGS_DISTRO =
endif

    时间值在代码中有默认值，请参阅src/timesync/timesyncd-manager.h：

    #define NTP_POLL_INTERVAL_MIN_USEC      (32 * USEC_PER_SEC)
#define NTP_POLL_INTERVAL_MAX_USEC      (2048 * USEC_PER_SEC)

#define NTP_RETRY_INTERVAL_MIN_USEC     (15 * USEC_PER_SEC)
#define NTP_RETRY_INTERVAL_MAX_USEC     (6 * 60 * USEC_PER_SEC) /* 6 minutes */

#define DEFAULT_CONNECTION_RETRY_USEC   (30 * USEC_PER_SEC)

#define DEFAULT_SAVE_TIME_INTERVAL_USEC (60 * USEC_PER_SEC)
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