[root@kvm81 ~]# vim /etc/chrony.conf server deyu.wang [root@kvm81 ~]# grep deyu /etc/chrony.conf server server.deyu.wang iburst
[root@kvm81 ~]# systemctl restart chronyd.service
[root@kvm81 ~]# systemctl enable chronyd.service
[root@kvm81 ~]# chronyc tracking Reference ID : 192.168.122.1 (deyu.wang) Stratum : 4 Ref time (UTC) : Tue Jan 20 03:01:00 2015 System time : 124520.273437500 seconds slow of NTP time Last offset : 0.000016787 seconds RMS offset : 11733.896484375 seconds Frequency : 0.074 ppm slow Residual freq : 0.007 ppm Skew : 0.413 ppm Root delay : 0.006454 seconds Root dispersion : 0.045809 seconds Update interval : 59.5 seconds Leap status : Normal
[root@kvm81 ~]# chronyc sources 210 Number of sources = 5 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^- server.deyu.wang 3 6 177 52 -837us[ -831us] +/- 55ms ^- ns.rpb.gov.tw 2 6 377 48 +3203us[+3209us] +/- 426ms ^+ 117-56-73-145.HINET-IP.hi 3 6 377 241 -102us[ +142us] +/- 106ms ^+ 220-135-58-124.HINET-IP.h 3 6 377 47 +248us[ +248us] +/- 76ms ^* 123-204-45-116.static.see 3 6 377 50 -636us[ -630us] +/- 67ms
[root@kvm7 ~]# chronyc chrony version 1.29.1 Copyright (C) 1997-2003, 2007, 2009-2013 Richard P. Curnow and others chrony comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under certain conditions. See the GNU General Public License version 2 for details. chronyc> help Commands: accheck <address> : Check whether NTP access is allowed to <address> activity : Check how many NTP sources are online/offline add peer <address> ... : Add a new NTP peer add server <address> ... : Add a new NTP server allow [<subnet-addr>] : Allow NTP access to that subnet as a default allow all [<subnet-addr>] : Allow NTP access to that subnet and all children burst <n-good>/<n-max> [<mask>/<masked-address>] : Start a rapid set of measurements clients : Report on clients that have accessed the server cmdaccheck <address> : Check whether command access is allowed to <address> cmdallow [<subnet-addr>] : Allow command access to that subnet as a default cmdallow all [<subnet-addr>] : Allow command access to that subnet and all children cmddeny [<subnet-addr>] : Deny command access to that subnet as a default cmddeny all [<subnet-addr>] : Deny command access to that subnet and all children cyclelogs : Close and re-open logs files delete <address> : Remove an NTP server or peer deny [<subnet-addr>] : Deny NTP access to that subnet as a default deny all [<subnet-addr>] : Deny NTP access to that subnet and all children dump : Dump all measurements to save files local off : Disable server capability for unsynchronised clock local stratum <stratum> : Enable server capability for unsynchronised clock makestep : Jump the time to remove any correction being slewed manual off|on|reset : Disable/enable/reset settime command and statistics manual list : Show previous settime entries maxdelay <address> <new-max-delay> : Modify maximum round-trip valid sample delay for source maxdelayratio <address> <new-max-ratio> : Modify max round-trip delay ratio for source maxdelaydevratio <address> <new-max-ratio> : Modify max round-trip delay dev ratio for source maxpoll <address> <new-maxpoll> : Modify maximum polling interval of source maxupdateskew <new-max-skew> : Modify maximum skew for a clock frequency update to be made minpoll <address> <new-minpoll> : Modify minimum polling interval of source minstratum <address> <new-min-stratum> : Modify minimum stratum of source offline [<mask>/<masked-address>] : Set sources in subnet to offline status online [<mask>/<masked-address>] : Set sources in subnet to online status password [<new-password>] : Set command authentication password polltarget <address> <new-poll-target> : Modify poll target of source reselect : Reselect synchronisation source rtcdata : Print current RTC performance parameters settime <date/time (e.g. Nov 21, 1997 16:30:05 or 16:30:05)> : Manually set the daemon time sources [-v] : Display information about current sources sourcestats [-v] : Display estimation information about current sources tracking : Display system time information trimrtc : Correct RTC relative to system clock waitsync [max-tries [max-correction [max-skew]]] : Wait until synchronised writertc : Save RTC parameters to file authhash <name>: Set command authentication hash function dns -n|+n : Disable/enable resolving IP addresses to hostnames dns -4|-6|-46 : Resolve hostnames only to IPv4/IPv6/both addresses timeout <milliseconds> : Set initial response timeout retries <n> : Set maximum number of retries exit|quit : Leave the program help : Generate this help chronyc>
[root@kvm81 ~]# systemctl restart chronyd.service
-l 選項查看 chrony 自動校時狀態及工作紀錄，倒數第二行，系統調整時間 127369.424623 秒。
[root@kvm81 ~]# systemctl status chronyd.service -l
chronyd.service - NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled)
Active: active (running) since Mon 2015-01-19 01:26:00 CST; 1 day 11h ago
Process: 18379 ExecStartPost=/usr/libexec/chrony-helper add-dhclient-servers (code=exited, status=0/SUCCESS)
Process: 18376 ExecStart=/usr/sbin/chronyd -u chrony $OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 18378 (chronyd)
CGroup: /system.slice/chronyd.service
└─18378 /usr/sbin/chronyd -u chrony
Jan 19 01:26:00 kvm81.deyu.wang systemd[1]: Starting NTP client/server...
Jan 19 01:26:00 kvm81.deyu.wang chronyd[18378]: chronyd version 1.29.1 starting
Jan 19 01:26:00 kvm81.deyu.wang chronyd[18378]: Linux kernel major=3 minor=10 patch=0
Jan 19 01:26:00 kvm81.deyu.wang chronyd[18378]: hz=100 shift_hz=7 freq_scale=1.00000000 nominal_tick=10000 slew_delta_tick=833 max_tick_bias=1000 shift_pll=2
Jan 19 01:26:00 kvm81.deyu.wang chronyd[18378]: Frequency 0.008 +/- 0.068 ppm read from /var/lib/chrony/drift
Jan 19 01:26:00 kvm81.deyu.wang systemd[1]: Started NTP client/server.
Jan 19 01:26:08 kvm81.deyu.wang chronyd[18378]: Selected source 120.119.28.1
Jan 19 01:26:08 kvm81.deyu.wang chronyd[18378]: System clock wrong by 127369.424623 seconds, adjustment started
Jan 20 12:48:57 kvm81.deyu.wang chronyd[18378]: System clock was stepped by 127369.425 seconds
[root@kvm81 ~]# date -s 2015-01-19 Mon Jan 19 00:00:00 CST 2015 [root@kvm81 ~]# chronyc -a makestep 200 OK 200 OK [root@kvm81 ~]# date Tue Jan 20 11:27:29 CST 2015