解决无法修改日志时间的问题（Local time zone must be set--see zic manual page 2019 ）

故障现象

1. 系统日志时间晚了整整8个小时，比如现在是中午12点，日志时间为凌晨4点
2. date命令报错（local time zone must be set--see zic manual page）

解决方案（失败）

1. 修改/etc/profile

   export tz='asia/shanghai'

   无效，date命令显示正常，但是放在脚本中的date命令依然报错，并且日志时间依然延后8小时

2. tzselect配置

   #tzselect 
   please identify a location so that time zone rules can be set correctly.
   please select a continent or ocean.
    1) africa
    2) americas
    3) antarctica
    4) arctic ocean
    5) asia
    6) atlantic ocean
    7) australia
    8) europe
    9) indian ocean
   10) pacific ocean
   11) none - i want to specify the time zone using the posix tz format.
   #? 5
   please select a country.
    1) afghanistan          18) israel            35) palestine
    2) armenia          19) japan            36) philippines
    3) azerbaijan          20) jordan            37) qatar
    4) bahrain          21) kazakhstan        38) russia
    5) bangladesh          22) korea (north)        39) saudi arabia
    6) bhutan          23) korea (south)        40) singapore
    7) brunei          24) kuwait            41) sri lanka
    8) cambodia          25) kyrgyzstan        42) syria
    9) china          26) laos            43) *
   10) cyprus          27) lebanon            44) tajikistan
   11) east timor          28) macau            45) thailand
   12) georgia          29) malaysia            46) turkmenistan
   13) *          30) *            47) united arab emirates
   14) india          31) myanmar (burma)        48) uzbekistan
   15) indonesia          32) nepal            49) vietnam
   16) iran          33) oman            50) yemen
   17) iraq          34) pakistan
   #? 9
   please select one of the following time zone regions.
   1) beijing time
   2) * time
   #? 1
   
   the following information has been given:
   
       china
       beijing time
   
   therefore tz='asia/shanghai' will be used.
   local time is now:    wed nov 27 15:47:48 cst 2019.
   universal time is now:    wed nov 27 07:47:48 utc 2019.
   is the above information ok?
   1) yes
   2) no
   #? 1
   
   you can make this change permanent for yourself by appending the line
       tz='asia/shanghai'; export tz
   to the file '.profile' in your home directory; then log out and log in again.
   
   here is that tz value again, this time on standard output so that you
   can use the /usr/bin/tzselect command in shell scripts:
   asia/shanghai
   [root@compute-0-10: 2019年 11月 27日 星期三 07:47:59 local time zone must be set--see zic manual page /root  3] 
   #date
   2019年 11月 27日 星期三 07:48:38 local time zone must be set--see zic manual page

   无效

3. /etc/localtime

   rm -f /etc/localtime
   cp  /usr/share/zoneinfo/asia/shanghai /etc/localtime

   依然没有什么鸟用

最后网上看了一篇文章大概是说可能是升级libc.so.6导致，尝试以下方法总算成功了

解决方案（成功！）

#ll /usr/local/glibc-2.14/etc/
总用量 8
-rw-r--r-- 1 root root 3694 7月  17 09:50 ld.so.cache
lrwxrwxrwx 1 root root   25 7月  17 09:50 localtime -> ../share/zoneinfo/factory
-rw-r--r-- 1 root root 1615 7月  17 09:50 rpc

#cd /usr/local/glibc-2.14/etc/

#rm localtime 
rm：是否删除符号链接 "localtime"？y

#ln -s /usr/local/glibc-2.14/share/zoneinfo/asia/shanghai localtime