CentOS7.X时间调整为系统时间之后，重新开机就无效了

[root@node01 ~]$ timedatectl
      Local time: 日 2022-09-18 10:22:31 GMT
  Universal time: 日 2022-09-18 10:22:31 UTC
        RTC time: 日 2022-09-18 10:22:31
       Time zone: Atlantic/Reykjavik (GMT, +0000)
     NTP enabled: n/a
NTP synchronized: no
 RTC in local TZ: no
      DST active: n/a

[root@node01 ~]$ timedatectl set-timezone Asia/Shanghai

[root@node01 ~]$ timedatectl
      Local time: 日 2022-09-18 18:36:25 CST
  Universal time: 日 2022-09-18 10:36:25 UTC
        RTC time: 日 2022-09-18 10:36:25
       Time zone: Asia/Shanghai (CST, +0800)
     NTP enabled: n/a
NTP synchronized: no
 RTC in local TZ: no
      DST active: n/a

[root@node01 ~]$ ls /usr/share/zoneinfo/
Africa      Atlantic   Chile    Eire     GB       GMT+0      Indian       Japan        Mexico   NZ-CHAT   posixrules  ROK        Universal  zone1970.tab
America     Australia  CST6CDT  EST      GB-Eire  Greenwich  Iran         Kwajalein    MST      Pacific   PRC         Singapore  US         zone.tab
Antarctica  Brazil     Cuba     EST5EDT  GMT      Hongkong   iso3166.tab  leapseconds  MST7MDT  Poland    PST8PDT     Turkey     UTC        Zulu
Arctic      Canada     EET      Etc      GMT0     HST        Israel       Libya        Navajo   Portugal  right       tzdata.zi  WET
Asia        CET        Egypt    Europe   GMT-0    Iceland    Jamaica      MET          NZ       posix     ROC         UCT        W-SU

[root@node01 ~]$ ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

# 安装ntpdate
[root@node01 ~]$ yum install -y ntpdate
# 同步时间
[root@node01 ~]$ ntpdate asia.pool.ntp.org
# 为了校对网络时间，将ntpdate服务设置为自启动，
[root@node01 ~]$ systemctl enable ntpdate.service
#启动ntp服务
[root@node01 ~]$ service ntpd restart
#查看时间
[root@node01 ~]$ timedatectl