linux 時(shí)間同步的有效設(shè)置步驟

適用于 centos7 和ubuntu16.04+的快捷設(shè)置方法。

   查看時(shí)間時(shí)區(qū)

   通過一個(gè)命令：timedatectl 查看時(shí)間和時(shí)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(shí)間同步設(shè)置

   設(shè)置時(shí)區(qū)

   如果你的時(shí)區(qū)不對，用下面的命令設(shè)置

   timedatectl set-timezone Asia/Shanghai

   時(shí)間同步服務(wù)神器chrony

   安裝

   yum/apt install chrony

   設(shè)置開機(jī)啟動(dòng)

   systemctl enable chronyd

   啟動(dòng)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(huì)說那設(shè)置完怎樣使Linux繼續(xù)保持精準(zhǔn)的NTP同步時(shí)間信息，根據(jù)教程這樣簡單的設(shè)置下，再也不用擔(dān)心,服務(wù)器的時(shí)間不準(zhǔn)了。