[20200313]centos 7修改時區.txt

[20200313]centos 7修改時區.txt

--//無意中檢查發現同事安裝的linux伺服器時區不對.更正過來做一個記錄.

--//當前時間是。
# date
Fri Mar 13 16:06:11 EDT 2020

# timedatectl
      Local time: Fri 2020-03-13 16:06:30 EDT
  Universal time: Fri 2020-03-13 20:06:30 UTC
        RTC time: Fri 2020-03-13 16:09:13
       Time zone: America/New_York (EDT, -0400)
     NTP enabled: n/a
NTP synchronized: no
 RTC in local TZ: no
      DST active: yes
 Last DST change: DST began at
                  Sun 2020-03-08 01:59:59 EST
                  Sun 2020-03-08 03:00:00 EDT
 Next DST change: DST ends (the clock jumps one hour backwards) at
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                  Sun 2020-11-01 01:59:59 EDT
                  Sun 2020-11-01 01:00:00 EST
--//tmd:好像還開啟類似夏令時的東西.

# timedatectl  set-timezone Asia/Shanghai

# timedatectl
      Local time: Sat 2020-03-14 04:08:11 CST
  Universal time: Fri 2020-03-13 20:08:11 UTC
        RTC time: Fri 2020-03-13 16:10:53
       Time zone: Asia/Shanghai (CST, +0800)
     NTP enabled: n/a
NTP synchronized: no
 RTC in local TZ: no
      DST active: n/a

--//現在時間完全不對
# date
Sat Mar 14 04:11:02 CST 2020

--//最簡單就是使用ntpdate與時間伺服器同步，檢查發現沒有安裝ntpd,centos 7採用chrony,這個也沒有安裝
--//只能先手工設定:

# date -s "Fri Mar 13 16:14:11 CST 2020"
Fri Mar 13 16:14:11 CST 2020

--//同步硬體時間。
# hwclock -w ;date
Fri Mar 13 16:17:54 CST 2020

# hwclock ;date
Fri 13 Mar 2020 04:18:19 PM CST  -0.500730 seconds
Fri Mar 13 16:18:19 CST 2020
--//這些應該在安裝資料庫前仔細檢查,實際上這個就是分工帶來的麻煩.