配置linux系统时区---解决ntp同步完时间不准问题

ntp配置完成后时间仍然不准有下面两种情况：

ntp服务端配置完ntp服务器后，查看时间和百度的时间不一样按照下面解决

ntp客户端同步完ntp服务器后，查看客户端的时间和百度不一致，按照下面解决

1、配置ntp服务器，设置时区同步，请参照ntp篇  https://www.cnblogs.com/effortsing/p/10011459.html

上面操作完后时间仍然无法同步，需要操作下面才可以

2、设置vmare虚拟机时区：

2.1 设置时区为上海

ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime 设置时区为上海

2.1  然后通过tzselect命令来修改时区

执行tzselect命令 --> 选择Asia --> 选择China --> 选择Beijing — 选择yes ，
执行完tzselect命令选择时区后，时区并没有更改，将export TZ=Asia/Shanghai   添加到/etc/profile文 件中去，然后退出并重新登陆即可。

sed -i '$a\export TZ=Asia/Shanghai' /etc/profile && source /etc/profile && date

下面是执行过程

[root@www ~]# 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) Taiwan
10) Cyprus 27) Lebanon 44) Tajikistan
11) East Timor 28) Macau 45) Thailand
12) Georgia 29) Malaysia 46) Turkmenistan
13) Hong Kong 30) Mongolia 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) Xinjiang Time
#? 1

The following information has been given:

China
Beijing Time

Therefore TZ='Asia/Shanghai' will be used.
Local time is now: Wed Dec 5 13:57:48 CST 2018.
Universal Time is now: Wed Dec 5 05:57:48 UTC 2018.
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

2.2、配置环境变量

[root@www ~]# sed -i '$a\export TZ=Asia/Shanghai' /etc/profile

[root@www ~]# sed -i '$d' /etc/profile

2.3、查看时间已经正常

[root@www ~]# date
Wed Dec 5 14:11:49 CST 2018