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ç§ãã¡ã®ããã€ã¹ãã³ã³ãã¥ãŒã¿ãŒãæ£ç¢ºãªæå»ãå¿ èŠãšããçç±ã¯ãããããããŸãã ããšãã°ãéè¡ãæ ªåŒåžå Žããã®ä»ã®éèããžãã¹ã§ã¯ããã©ã³ã¶ã¯ã·ã§ã³ã¯é©åãªé åºã§å®è¡ãããå¿ èŠãããããã®ããã«ã¯æ£ç¢ºãªæéé åºãéèŠã§ãã
æºåž¯é»è©±ãã¿ãã¬ãããèªåè»ãGPS ã·ã¹ãã ãã³ã³ãã¥ãŒã¿ãŒã¯ãã¹ãŠãæ£ç¢ºãªæå»ãšæ¥ä»ã®èšå®ãå¿ èŠã§ãã ã³ã³ãã¥ãŒã¿ã®ãã¹ã¯ãããäžã®æèšãæ£ããæå»ã衚瀺ããããã«ãããã§ãã ããŒã«ã«ã«ã¬ã³ããŒã«é©åãªã¿ã€ãã³ã°ã§ãªãã€ã³ããŒã衚瀺ãããããã«ãããã§ãã æå»ãæ£ãããšãcron ãžã§ããš systemd ãžã§ããæ£ããæå»ã«å®è¡ãããããšãä¿èšŒãããŸãã
ãã°ã«ã¯æ¥ä»ãšæå»ãéèŠã§ãããããæ¥ä»ãšæå»ã«åºã¥ããŠç¹å®ã®ãã°ãèŠã€ããã®ãå°ãç°¡åã«ãªããŸãã ããšãã°ãç§ã¯ãã€ãŠ DevOps (åœæã¯ããåŒã°ããŠããŸããã§ãã) ã§åããŠãããããŒã¹ã«ãã©ã€ãå·ã§é»åã¡ãŒã« ã·ã¹ãã ãã»ããã¢ããããŠããŸããã 以å㯠20 æ¥ã« XNUMX äžä»¶ä»¥äžã®ã¡ãŒã«ãåŠçããŠããŸããã ããããã®ã³ã³ãã¥ãŒã¿ãåæãããŠããã°ãäžé£ã®ãµãŒããŒãä»ããŠé»åã¡ãŒã«ã远跡ããããå°ççã«åæ£ãããã¹ãäžã®ãã° ãã¡ã€ã«ã䜿çšããŠã€ãã³ãã®æ£ç¢ºãªé åºãç¹å®ãããããããšãã¯ããã«ç°¡åã«ãªããŸãã
XNUMX åããäœæéã
Linux ãã¹ãã§ã¯ãã·ã¹ãã æéãš RTC æéãååšããããšãèæ ®ããå¿ èŠããããŸãã RTC (Real Time Clock) ã¯ãããŒããŠã§ã¢ ã¯ããã¯ã®å°ãå¥åŠã§ãããŸãæ£ç¢ºã§ã¯ãªãååã§ãã
ããŒããŠã§ã¢ ã¯ããã¯ã¯ãã³ã³ãã¥ãŒã¿ã®é»æºããªãã®å Žåã§ããã·ã¹ãã ãã¶ãŒããŒãã®ããããªã䜿çšããŠç¶ç¶çã«åäœããŸãã RTC ã®äž»ãªæ©èœã¯ãã¿ã€ã ãµãŒããŒãžã®æ¥ç¶ãå©çšã§ããªãå Žåã«æå»ãä¿åããããšã§ãã ã€ã³ã¿ãŒãããçµç±ã§ã¿ã€ã ãµãŒããŒã«æ¥ç¶ããããšãäžå¯èœã ã£ãæ代ããã¹ãŠã®ã³ã³ãã¥ãŒã¿ã«ã¯æ£ç¢ºãªå éšæèšãå¿ èŠã§ããã ãªãã¬ãŒãã£ã³ã° ã·ã¹ãã ã¯èµ·åæã« RTC ã«ã¢ã¯ã»ã¹ããå¿ èŠãããããŠãŒã¶ãŒã¯ BIOS ããŒããŠã§ã¢æ§æã€ã³ã¿ãŒãã§ã€ã¹ã䜿çšããŠã·ã¹ãã æå»ãæåã§èšå®ãããããæ£ããããšã確èªããå¿ èŠããããŸããã
ããŒããŠã§ã¢ ã¯ããã¯ã¯ã¿ã€ã ãŸãŒã³ã®æŠå¿µãç解ããŠããŸããã RTC ã¯æå»ã®ã¿ãä¿åããã¿ã€ã ãŸãŒã³ã UTC (åå®äžçæãGMT ãŸãã¯ã°ãªãããžæšæºæãšãåŒã°ããŸã) ããã®ãªãã»ããã¯ä¿åããŸããã RTC ã¯ããã®èšäºã§åŸã»ã©èª¬æããããŒã«ã䜿çšããŠã€ã³ã¹ããŒã«ã§ããŸãã
ã·ã¹ãã æå»ã¯ãOS ããã¹ã¯ãããäžã® GUI ã¯ããã¯ãdate ã³ãã³ãã®åºåããã°ã®ã¿ã€ã ã¹ã¿ã³ãã«è¡šç€ºããæå»ã§ãã ããã¯ããã¡ã€ã«ãäœæãå€æŽãããã³éããããšãã«ãåœãŠã¯ãŸããŸãã
ããŒãžäž
NTP ãšã¯äœã§ãã?
äžçäžã®ã³ã³ãã¥ãŒã¿ã¯ãNTP (Network Time Protocol) ã䜿çšããŠãNTP ãµãŒããŒã®éå±€ã䜿çšããŠã€ã³ã¿ãŒãããäžã®æšæºåºæºã¯ããã¯ãšæå»ãåæãããŸãã äž»èŠãªã¿ã€ã ãµãŒããŒã¯ã¬ã€ã€ãŒ 1 ã«ãããè¡æãç¡ç·ãããã«ã¯é»è©±åç·äžã®ã¢ãã ãä»ããŠã¬ã€ã€ãŒ 0 ã®ããŸããŸãªåœå®¶æå»ãµãŒãã¹ã«çŽæ¥æ¥ç¶ãããŠããŸãã ã¬ã€ã€ 0 æå»ãµãŒãã¹ã«ã¯ãååæèšãååæèšã«ãã£ãŠéä¿¡ãããä¿¡å·ã«å調ãããç¡ç·åä¿¡æ©ããŸã㯠GPS è¡æã«ãã£ãŠéä¿¡ãããé«ç²ŸåºŠã®ã¯ããã¯ä¿¡å·ã䜿çšãã GPS åä¿¡æ©ãªã©ããããŸãã
ãªãã¡ã¬ã³ã¹ ãµãŒããŒã®å€§éšåã«ã¯ãæ°åå°ã®ãããªã㯠NTP Stratum 2 ãµãŒããŒãå ¬éãããŠããŸãã NTP ãµãŒããŒãå¿ èŠãšããå€æ°ã®ãã¹ããæã€å€ãã®çµç¹ããŠãŒã¶ãŒ (ç§èªèº«ãå«ã) ã¯ãç¬èªã®ã¿ã€ã ãµãŒããŒãèšå®ããŠã2 ã€ã®ããŒã«ã« ãã¹ãã ããã¹ãã©ã¿ã 3 ãŸã㯠3 ã«ã¢ã¯ã»ã¹ããããšãéžæããŸãããã®åŸããããã¯ãŒã¯äžã®æ®ãã®ããŒããããŒã«ã« ãµãŒããŒã䜿çšããããã«æ§æããŸããã¿ã€ã ãµãŒããŒã ç§ã®ããŒã ãããã¯ãŒã¯ã®å Žåãããã¯ã¬ã€ã€ãŒ XNUMX ãµãŒããŒã§ãã
NTP ã®ããŸããŸãªå®è£
NTP ã®å ã®å®è£ 㯠ntpd ã§ãã ãã®åŸãchronyd ãš systemd-timesyncd ãšãã XNUMX ã€ã®æ°ãããã®ãå ãããŸããã XNUMX ã€ãšããããŒã«ã« ãã¹ãã®æå»ã NTP ã¿ã€ã ãµãŒããŒãšåæããŸãã systemd-timesyncd ãµãŒãã¹ã¯ chronyd ã»ã©ä¿¡é Œæ§ããããŸããããã»ãšãã©ã®ç®çã«ã¯ååã§ãã RTC ãåæããŠããªãå ŽåãããŒã«ã« ã·ã¹ãã æå»ããããã«ããããšãNTP ãµãŒããŒãšåæããããã«ã·ã¹ãã æå»ãåŸã ã«èª¿æŽã§ããŸãã systemd-timesync ãµãŒãã¹ã¯ã¿ã€ã ãµãŒããŒãšããŠäœ¿çšã§ããŸããã
- Chrony ã¯ãå€ã ntpd ãµãŒãã¹ãããã¯ããã«é«éã«ã¿ã€ã ãµãŒããŒãšåæã§ããŸãã ããã¯ãåžžã«åäœããªãã©ããããããŸãã¯ãã¹ã¯ãããã«é©ããŠããŸãã
- ãã¹ããã¹ãªãŒããããšããã¹ãªãŒã ã¢ãŒãã«å ¥ããšãããŸãã¯äœè² è·æã«ã¯ããã¯ãé ããªãåšæ³¢æ°ãããã³ã°ã«ãã£ãŠã¯ããã¯ãå€åãããšããªã©ãã¯ããã¯ã®å€åãè£æ£ã§ããŸãã
- äžå®å®ãªãããã¯ãŒã¯æ¥ç¶ããããã¯ãŒã¯ã®æ··éã«é¢é£ããæéã®åé¡ã解決ããŸãã
- ãããã¯ãŒã¯é 延ã調æŽããŸãã
- æåã®æå»åæã®åŸãChrony ã¯æèšãåæ¢ããŸããã ããã«ãããå€ãã®ã·ã¹ãã ãµãŒãã¹ãšã¢ããªã±ãŒã·ã§ã³ã«å®å®ããäžè²«ããã¿ã€ã ã¹ããããæäŸãããŸãã
- Chrony ã¯ãããã¯ãŒã¯ã«æ¥ç¶ããŠããªããŠãåäœããŸãã ãã®å ŽåãããŒã«ã« ãã¹ããŸãã¯ãµãŒããŒãæåã§æŽæ°ã§ããŸãã
- Chrony 㯠NTP ãµãŒããŒãšããŠæ©èœã§ããŸãã
ç¹°ãè¿ãã«ãªããŸãããNTP ã¯ãChrony ãŸã㯠systemd-timesyncd ã䜿çšã㊠Linux ãã¹ãã«å®è£ ã§ãããããã³ã«ã§ãã
NTPãChronyãsystemd-timesyncd RPM ã¯ãæšæºã® Fedora ãªããžããªã§å©çšã§ããŸãã systemd-udev RPM ã¯ãFedora ã«ããã©ã«ãã§ã€ã³ã¹ããŒã«ãããã«ãŒãã« ã€ãã³ã ãããŒãžã£ãŒã§ããããªãã·ã§ã³ã§ãã
XNUMX ã€ãã¹ãŠãã€ã³ã¹ããŒã«ããŠããããåãæ¿ããããšãã§ããŸãããããã«ããããã«é ã®çãåé¡ãçºçããŸãã ã ãããããªãã»ããããã®ã§ãã FedoraãCentOSãRHEL ã®ææ°ãªãªãŒã¹ã¯ããã©ã«ãå®è£ ãšã㊠Chrony ã«ç§»è¡ããŠãããsystemd-timesyncd ãåããŠããŸãã Chrony ã¯ããŸãæ©èœããNTP ãµãŒãã¹ãããåªããã€ã³ã¿ãŒãã§ã€ã¹ãæäŸããã¯ããã«å€ãã®æ å ±ãšå¶åŸ¡ãæäŸãããããã·ã¹ãã 管çè ã¯ç¢ºå®ã«æºè¶³ã§ãããšæããŸãã
NTPãµãŒãã¹ã®ç¡å¹å
NTP ãµãŒãã¹ã¯ãã¹ãäžã§ãã§ã«å®è¡ãããŠããå¯èœæ§ããããŸãã ãã®å Žåã¯ãä»ã®ãã®ã«åãæ¿ããåã«ç¡å¹ã«ããå¿ èŠããããŸãã chronyd ãå®è¡ããŠããã®ã§ã次ã®ã³ãã³ãã䜿çšããŠåæ¢ããç¡å¹ã«ããŸããã ãã¹ãäžã§å®è¡ããŠãã NTP ããŒã¢ã³ã«å¯ŸããŠé©åãªã³ãã³ããå®è¡ããŸãã
[root@testvm1 ~]# systemctl disable chronyd ; systemctl stop chronyd
Removed /etc/systemd/system/multi-user.target.wants/chronyd.service.
[root@testvm1 ~]#
ãµãŒãã¹ãåæ¢ãããç¡å¹ã«ãªã£ãŠããããšã確èªããŸãã
[root@testvm1 ~]# systemctl status chronyd
â chronyd.service - NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: man:chronyd(8)
man:chrony.conf(5)
[root@testvm1 ~]#
æã¡äžãåã®ã¹ããŒã¿ã¹ãã§ãã¯
ã·ã¹ãã ã¯ããã¯ã®åæã¹ããŒã¿ã¹ã«ãããNTP ãµãŒãã¹ãå®è¡ãããŠãããã©ãããå€æã§ããŸãã ãŸã NTP ãéå§ããŠããªããããtimesync-status ã³ãã³ãã¯ããã瀺åããŸãã
[root@testvm1 ~]# timedatectl timesync-status
Failed to query server: Could not activate remote peer.
ã¹ããŒã¿ã¹ãçŽæ¥ãªã¯ãšã¹ããããšãéèŠãªæ å ±ãåŸãããŸãã ããšãã°ãåŒæ°ããªãã·ã§ã³ãæå®ããªã timedatectl ã³ãã³ãã¯ãããã©ã«ã㧠status ãµãã³ãã³ããå®è¡ããŸãã
[root@testvm1 ~]# timedatectl status
Local time: Fri 2020-05-15 08:43:10 EDT
Universal time: Fri 2020-05-15 12:43:10 UTC
RTC time: Fri 2020-05-15 08:43:08
Time zone: America/New_York (EDT, -0400)
System clock synchronized: no
NTP service: inactive
RTC in local TZ: yes
Warning: The system is configured to read the RTC time in the local time zone.
This mode cannot be fully supported. It will create various problems
with time zone changes and daylight saving time adjustments. The RTC
time is never updated, it relies on external facilities to maintain it.
If at all possible, use RTC in UTC by calling
'timedatectl set-local-rtc 0'.
[root@testvm1 ~]#
ããã«ããããã¹ãã®çŸå°æéãUTC æéãããã³ RTC æéãåŸãããŸãã ãã®å Žåãã·ã¹ãã æå»ã¯ America/New_York (TZ) ã¿ã€ã ãŸãŒã³ã«èšå®ãããRTC ã¯ããŒã«ã« ã¿ã€ã ãŸãŒã³ã®æå»ã«èšå®ãããNTP ãµãŒãã¹ã¯ã¢ã¯ãã£ãã§ã¯ãããŸããã RTC æå»ãã·ã¹ãã æå»ãããããã«ããå§ããŠããŸãã ããã¯ãã¯ããã¯ãåæãããŠããªãã·ã¹ãã ã§ã¯æ£åžžã§ãã ãã¹ãäžã®ãªãã»ããéã¯ãã·ã¹ãã ãæåŸã«åæãããŠããã®çµéæéã«ãã£ãŠç°ãªããŸãã
ãŸããRTC ã«çŸå°æéã䜿çšããããšã«é¢ããèŠåãåãåããŸãããããã¯ãã¿ã€ã ãŸãŒã³ã®å€æŽãš DST èšå®ã«é©çšãããŸãã å€æŽãå ããå¿ èŠããããšãã«ã³ã³ãã¥ãŒã¿ã®é»æºããªãã«ãªã£ãŠããå ŽåãRTC ã¯å€æŽãããŸããã ãããããµãŒããŒããã®ä»ã®ãã¹ãã XNUMX æé皌åããŠããå Žåãããã¯ãŸã£ããåé¡ã«ãªããŸããã ããã«ãNTP æå»åæãæäŸãããµãŒãã¹ã¯ãæåã®èµ·å段éã§ãã¹ãã®æå»ã調æŽãããããèµ·åå®äºåŸã«æå»ãåã³æ£ç¢ºã«ãªããŸãã
ã¿ã€ã ãŸãŒã³ã®èšå®
éåžžãã¿ã€ã ãŸãŒã³ã¯ã€ã³ã¹ããŒã«æé äžã«æå®ããåŸã§å€æŽããå¿ èŠã¯ãããŸããã ãã ããã¿ã€ã ãŸãŒã³ãå€æŽããå¿ èŠãããå ŽåããããŸãã 圹ç«ã€ããŒã«ãããã€ããããŸãã Linux ã¯ãã¿ã€ã ãŸãŒã³ ãã¡ã€ã«ã䜿çšããŠãã¹ãã®ããŒã«ã« ã¿ã€ã ãŸãŒã³ã決å®ããŸãã ãããã®ãã¡ã€ã«ã¯ãã£ã¬ã¯ããªã«ãããŸã /usr/share/zoneinfoã ç§ã®ã¿ã€ã ãŸãŒã³ã§ã¯ãããã©ã«ãã§ã·ã¹ãã ã次ã®ããã«èŠå®ããŠããŸãã /etc/localtime -> ../usr/share/zoneinfo/America/New_Yorkã ãã ããã¿ã€ã ãŸãŒã³ãå€æŽããããã«ãã®ãããªåŸ®åŠãªç¹ãç¥ãå¿ èŠã¯ãããŸããã
éèŠãªããšã¯ãèªåã®å Žæã®æ£åŒãªã¿ã€ã ãŸãŒã³åãšã察å¿ããã³ãã³ããç¥ãããšã§ãã ã¿ã€ã ãŸãŒã³ãããµã³ãŒã«ã¹ã«å€æŽããããšããŸãã
[root@testvm2 ~]# timedatectl list-timezones | column
<SNIP>
America/La_Paz Europe/Budapest
America/Lima Europe/Chisinau
America/Los_Angeles Europe/Copenhagen
America/Maceio Europe/Dublin
America/Managua Europe/Gibraltar
America/Manaus Europe/Helsinki
<SNIP>
ããã§ã¿ã€ã ãŸãŒã³ãèšå®ã§ããããã«ãªããŸããã å€æŽã確èªããããã« date ã³ãã³ãã䜿çšããŸããããtimedatectl ã䜿çšããããšãã§ããŸãã
[root@testvm2 ~]# date
Tue 19 May 2020 04:47:49 PM EDT
[root@testvm2 ~]# timedatectl set-timezone America/Los_Angeles
[root@testvm2 ~]# date
Tue 19 May 2020 01:48:23 PM PDT
[root@testvm2 ~]#
ããã§ããã¹ãã®ã¿ã€ã ãŸãŒã³ãçŸå°æéã«æ»ãããšãã§ããŸãã
systemd-timesyncd
systemd timesync ããŒã¢ã³ã¯ãsystemd ã³ã³ããã¹ãã§ç®¡çãããã NTP å®è£ ãæäŸããŸãã Fedora ãš Ubuntu ã«ã¯ããã©ã«ãã§ã€ã³ã¹ããŒã«ãããŸãã ãã ããããã©ã«ãã§ã¯ Ubuntu ã§ã®ã¿èµ·åããŸãã ä»ã®ãã£ã¹ããªãã¥ãŒã·ã§ã³ã«ã€ããŠã¯ããããŸããã èªåã§ç¢ºèªã§ããŸãã
[root@testvm1 ~]# systemctl status systemd-timesyncd
systemd-timesyncd ã®æ§æ
systemd-timesyncd ã®èšå®ãã¡ã€ã«ã¯æ¬¡ã®ãšããã§ãã /etc/systemd/timesyncd.confã ããã¯ãå€ã NTP ãµãŒãã¹ã chronyd ãµãŒãã¹ãããæå¹ãªãªãã·ã§ã³ãå°ãªãåçŽãªãã¡ã€ã«ã§ãã ç§ã® Fedora VM äžã®ãã®ãã¡ã€ã«ã®å 容 (è¿œå ã®å€æŽãªã) ã¯æ¬¡ã®ãšããã§ãã
# 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.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See timesyncd.conf(5) for details.
[Time]
#NTP=
#FallbackNTP=0.fedora.pool.ntp.org 1.fedora.pool.ntp.org 2.fedora.pool.ntp.org 3.fedora.pool.ntp.org
#RootDistanceMaxSec=5
#PollIntervalMinSec=32
#PollIntervalMaxSec=2048
ã³ã¡ã³ã以å€ã«å«ãŸããå¯äžã®ã»ã¯ã·ã§ã³ã¯ [Time] ã§ãã ä»ã®è¡ã¯ãã¹ãŠã³ã¡ã³ãã¢ãŠããããŠããŸãã ãããã¯ããã©ã«ãå€ã§ããã(çç±ããªãéã) å€æŽããªãã§ãã ããã NTP= è¡ã§ NTP ã¿ã€ã ãµãŒããŒãå®çŸ©ãããŠããªãå ŽåãFedora ã¯ããã©ã«ãã§ãã©ãŒã«ãã㯠Fedora ã¿ã€ã ãµãŒããŒã䜿çšããŸãã éåžžãã¿ã€ã ãµãŒããŒãè¿œå ããŸãã
NTP=myntpserver
timesync ã®å®è¡äž
次ã®ããã« systemd-timesyncd ãèµ·åããŠã¢ã¯ãã£ãã«ããããšãã§ããŸãã
[root@testvm2 ~]# systemctl enable systemd-timesyncd.service
Created symlink /etc/systemd/system/dbus-org.freedesktop.timesync1.service â /usr/lib/systemd/system/systemd-timesyncd.service.
Created symlink /etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service â /usr/lib/systemd/system/systemd-timesyncd.service.
[root@testvm2 ~]# systemctl start systemd-timesyncd.service
[root@testvm2 ~]#
ããŒããŠã§ã¢ã¯ããã¯ã®èšå®
timesyncd ãå®è¡ããåŸã®ç¶æ³ã¯æ¬¡ã®ããã«ãªããŸãã
[root@testvm2 systemd]# timedatectl
Local time: Sat 2020-05-16 14:34:54 EDT
Universal time: Sat 2020-05-16 18:34:54 UTC
RTC time: Sat 2020-05-16 14:34:53
Time zone: America/New_York (EDT, -0400)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
æåã¯ãRTC ãšçŸå°æé (EDT) ã®å·®ã¯ XNUMX ç§æªæºã§ããã次ã®æ°æ¥éã§ãã®å·®ã¯ããã«æ°ç§å¢å ããŸãã RTC ã«ã¯ã¿ã€ã ãŸãŒã³ã®æŠå¿µããªããããtimedatectl ã³ãã³ãã¯æ¯èŒãå®è¡ããŠæ£ããã¿ã€ã ãŸãŒã³ã決å®ããå¿ èŠããããŸãã RTC æéãçŸå°æéãšæ£ç¢ºã«äžèŽããªãå Žåã¯ãçŸå°ã®ã¿ã€ã ãŸãŒã³ãšãäžèŽããŸããã
ããã«è©³ããæ å ±ãæ±ããŠãsystemd-timesync ã®ã¹ããŒã¿ã¹ã確èªãããšããã次ã®ããšãããããŸããã
[root@testvm2 systemd]# systemctl status systemd-timesyncd.service
â systemd-timesyncd.service - Network Time Synchronization
Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: disabled)
Active: active (running) since Sat 2020-05-16 13:56:53 EDT; 18h ago
Docs: man:systemd-timesyncd.service(8)
Main PID: 822 (systemd-timesyn)
Status: "Initial synchronization to time server 163.237.218.19:123 (2.fedora.pool.ntp.org)."
Tasks: 2 (limit: 10365)
Memory: 2.8M
CPU: 476ms
CGroup: /system.slice/systemd-timesyncd.service
ââ822 /usr/lib/systemd/systemd-timesyncd
May 16 09:57:24 testvm2.both.org systemd[1]: Starting Network Time Synchronization...
May 16 09:57:24 testvm2.both.org systemd-timesyncd[822]: System clock time unset or jumped backwards, restoring from recorded timestamp: Sat 2020-05-16 13:56:53 EDT
May 16 13:56:53 testvm2.both.org systemd[1]: Started Network Time Synchronization.
May 16 13:57:56 testvm2.both.org systemd-timesyncd[822]: Initial synchronization to time server 163.237.218.19:123 (2.fedora.pool.ntp.org).
[root@testvm2 systemd]#
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timedatectl ã³ãã³ãã«ã¯ãã·ã¹ãã ã¯ããã¯ããããŒããŠã§ã¢ ã¯ããã¯ã®å€ãååŸããæ¹æ³ããããŸããã ã³ãã³ãã©ã€ã³ã«å ¥åãããå€ããã®ã¿æå»ãšæ¥ä»ãèšå®ã§ããŸãã hw Clock ã³ãã³ãã䜿çšããŠãRTC ãã·ã¹ãã æéãšåãå€ã«èšå®ã§ããŸãã
[root@testvm2 ~]# /sbin/hwclock --systohc --localtime
[root@testvm2 ~]# timedatectl
Local time: Mon 2020-05-18 13:56:46 EDT
Universal time: Mon 2020-05-18 17:56:46 UTC
RTC time: Mon 2020-05-18 13:56:46
Time zone: America/New_York (EDT, -0400)
System clock synchronized: yes
NTP service: active
RTC in local TZ: yes
--localtime ãªãã·ã§ã³ã¯ãããŒããŠã§ã¢ ã¯ããã¯ã« UTC ã§ã¯ãªãçŸå°æéã衚瀺ããããã«æ瀺ããŸãã
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