参考文献

chrony

安装

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apt-get install chrony

显示系统时钟性能的参数

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# chronyc tracking
Reference ID    : CA760182 (time.neu.edu.cn)
Stratum         : 3
Ref time (UTC)  : Wed Mar 19 01:28:02 2025
System time     : 0.000000166 seconds fast of NTP time
Last offset     : +0.000341989 seconds
RMS offset      : 0.000341989 seconds
Frequency       : 9.475 ppm slow
Residual freq   : -216.112 ppm
Skew            : 1000000.000 ppm
Root delay      : 0.041528080 seconds
Root dispersion : 6.417131901 seconds
Update interval : 1.4 seconds
Leap status     : Normal

显示时间同步源

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# chronyc sources
210 Number of sources = 8
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^- prod-ntp-5.ntp1.ps5.cano>     2   6    17    17    -15ms[  -15ms] +/-  111ms
^- prod-ntp-4.ntp1.ps5.cano>     2   6    17    17  -5136us[-5136us] +/-  120ms
^- alphyn.canonical.com          2   6    17    19  -3494us[-3152us] +/-  134ms
^- prod-ntp-3.ntp4.ps5.cano>     2   6    17    18    -30ms[  -30ms] +/-  115ms
^- ntp1.flashdance.cx            2   6    17    18  +6771us[+6771us] +/-  129ms
^* time.neu.edu.cn               2   6    17    18   +391us[ +733us] +/-   21ms
^- a.chl.la                      2   6    17    20  +7982us[+8324us] +/-   95ms
^? 113.207.49.85                 0   6     0     -     +0ns[   +0ns] +/-    0ns

查看当前系统的时间同步源状态信息（例如漂移率和偏移估算过程）

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# chronyc sourcestats
210 Number of sources = 8
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
prod-ntp-5.ntp4.ps5.cano>   4   3     8  +2174.369  25830.625    +69ms  5601us
prod-ntp-4.ntp4.ps5.cano>   4   3     9  -1728.351  98739.695    -94ms    14ms
alphyn.canonical.com        4   3     9   +338.964  45813.980    +13ms  7470us
prod-ntp-3.ntp1.ps5.cano>   4   3    10  -2410.892  15184.396   -125ms  3969us
ntp1.flashdance.cx          4   4    10    -25.600   1606.538   +303us   338us
time.neu.edu.cn             4   3     8   -216.112   2223.333  -8637us   431us
a.chl.la                    4   3     8    -56.325  12130.501  +3911us  1982us
113.207.49.85               0   0     0     +0.000   2000.000     +0ns  4000ms

查看时间同步源的状态

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# chronyc activity
200 OK
8 sources online
0 sources offline
0 sources doing burst (return to online)
0 sources doing burst (return to offline)
0 sources with unknown address

配置文件

  • 配置文件可能路径(不同操作系统可能存在差异):

    • /etc/chrony.conf

    • /etc/chrony/chrony.conf

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# Welcome to the chrony configuration file. See chrony.conf(5) for more
# information about usuable directives.

# This will use (up to):
# - 4 sources from ntp.ubuntu.com which some are ipv6 enabled
# - 2 sources from 2.ubuntu.pool.ntp.org which is ipv6 enabled as well
# - 1 source from [01].ubuntu.pool.ntp.org each (ipv4 only atm)
# This means by default, up to 6 dual-stack and up to 2 additional IPv4-only
# sources will be used.
# At the same time it retains some protection against one of the entries being
# down (compare to just using one of the lines). See (LP: #1754358) for the
# discussion.
#
# About using servers from the NTP Pool Project in general see (LP: #104525).
# Approved by Ubuntu Technical Board on 2011-02-08.
# See http://www.pool.ntp.org/join.html for more information.
pool ntp.ubuntu.com        iburst maxsources 4
pool 0.ubuntu.pool.ntp.org iburst maxsources 1
pool 1.ubuntu.pool.ntp.org iburst maxsources 1
pool 2.ubuntu.pool.ntp.org iburst maxsources 2

# This directive specify the location of the file containing ID/key pairs for
# NTP authentication.
keyfile /etc/chrony/chrony.keys

# This directive specify the file into which chronyd will store the rate
# information.
driftfile /var/lib/chrony/chrony.drift

# Uncomment the following line to turn logging on.
#log tracking measurements statistics

# Log files location.
logdir /var/log/chrony

# Stop bad estimates upsetting machine clock.
maxupdateskew 100.0

# This directive enables kernel synchronisation (every 11 minutes) of the
# real-time clock. Note that it can’t be used along with the 'rtcfile' directive.
rtcsync

# Step the system clock instead of slewing it if the adjustment is larger than
# one second, but only in the first three clock updates.
makestep 1 3

配置服务器

  • 作为时钟源的服务器配置
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vim /etc/chrony/chrony.conf

server 127.0.0.1 iburst        #本地作为时钟源
local stratum 10           #允许本地同步
allow        #允许所有连接
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# 开机启动
systemctl enable chronyd
# 启动服务
systemctl start chronyd
# 查看状态
systemctl status chronyd
# 查看同步 带星号*为同步成功
chronyc sources -v
  • 作为客户端配置
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vim /etc/chrony/chrony.conf

server 时钟源服务器IP iburst
# 运行所有访问
allow 
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# 查看同步状态，显示刚刚配置的ip 并且ip前面有，*星号即为成功 ，这个符号 ^ 为失败
chronyc sources -v