Azure虚拟机时间同步问题

场景描述：在Azure上新创建虚拟机默认是UTC时区的,因为业务在国内,所以要修改在CST
注：协调世界时（英语：Coordinated Universal Time，法语：Temps Universel Coordonné，简称UTC）是最主要的世界时间标准，其以原子时秒长为基础，在时刻上尽量接近于格林尼治标准时间;
CST: China Standard Time 北京时间

Azure虚拟机时区修改方法1：
Azure官方提供方法：AzureDoc
描述：操作到最后一步时一直报echo write error: no device,echo写错误,没有这个设备

Azure虚拟机时区修改方法2：
描述：尝试后一段时间,还是修改转换成原来的UTC

#确定时间
[root@test ~]# date -R
Fri, 23 Mar 2018 03:50:13 +0000

#设定时区
[root@test ~]# 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:	Fri Mar 23 11:50:33 CST 2018.
Universal Time is now:	Fri Mar 23 03:50:33 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 /bin/tzselect command in shell scripts:
Asia/Shanghai

[root@test ~]# date
Fri Mar 23 03:50:42 UTC 2018

##移除本地软件链接文件localtime
[root@test~]# rm /etc/localtime 
rm: remove symbolic link ‘/etc/localtime’? y
[root@test ~]# ll /etc/localtime
ls: cannot access /etc/localtime: No such file or directory

##重新创建软链接
[root@test ~]# ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[root@test ~]# date
Fri Mar 23 11:51:43 CST 2018

#重启
[root@test ~]# reboot

　　

Azure虚拟机时区修改方法三：
描述：直接使用shanghai时区文件覆盖

[root@test ~]# cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[root@test ~]# hwclock
[root@test ~]# reboot

　　

注释：
a. 在/usr/share/zoneinfo/Asia下存放是各国时区的文件
b. /etc/localtime主要是redhat、centos系统控制时区的文件,/etc/timezone主要是ubuntu