適用于 centos7 和ubuntu16.04+的快捷設置方法。

   查看時間時區(qū)

   通過一個命令：timedatectl 查看時間和時區(qū)和NTP是否同步等信息一目了然,非常好用。

   root@tos-cen084036:~# timedatectl

   Local time: Fri 2018-04-27 21:56:17 CST

   Universal time: Fri 2018-04-27 13:56:17 UTC

   RTC time: Fri 2018-04-27 13:57:11

   Time zone: Asia/Shanghai (CST, +0800)

   Network time on: yes

   NTP synchronized: yes

   RTC in local TZ: no

時間同步設置

   設置時區(qū)

   如果你的時區(qū)不對，用下面的命令設置

   timedatectl set-timezone Asia/Shanghai

   時間同步服務神器chrony

   安裝

   yum/apt install chrony

   設置開機啟動

   systemctl enable chronyd

   啟動chronyd

   systemctl restart chronyd

   查看chrony 效果

   root@tos-cen084036:~# chronyc sources -v

   210 Number of sources = 4

.-- Source mode '^' = server, '=' = peer,'#' = local clock.

/ .- Source state '*' = current synced, '+'= combined , '-' = not combined,

| / '?' = unreachable, 'x' = time may be inerror, '~' = time too variable.

|| .- xxxx [ yyyy ] +/- zzzz

|| Reachability register (octal) -. | xxxx= adjusted offset,

|| Log2(Polling interval) --. | | yyyy =measured offset,

|| | | zzzz = estimated error.

|| | |

MS Name/IP address Stratum Poll ReachLastRx Last sample

===============================================================================

^- 61-216-153-105.hinet-ip.h 3 8 266 529+24ms[ +25ms] +/- 92ms

^- 119.79-161-57.customer.ly 2 10 375 955+31ms[ +32ms] +/- 305ms

^* time4.aliyun.com 2 9 377 258 +12ms[+14ms] +/- 20ms

^- ntp5.flashdance.cx 2 9 267 109 +17ms[+17ms] +/- 137ms

  結(jié)束語

  用戶會說那設置完怎樣使Linux繼續(xù)保持精準的NTP同步時間信息，根據(jù)教程這樣簡單的設置下，再也不用擔心,服務器的時間不準了。