CentOS VPS Modified Time zone The final solution of different steps

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Because of the initial use of the domestic Hyper-V architecture VPS and before buying to specify the installation of Windows or CentOS system, because the wood has a reload of the panel, for the use of Debian I really torture, the operation of the process encountered a variety of small problems. Ask customer Service directly a sentence only understand winows environment, let you install win you have to install Linux. Well, CentOS can only grope for himself. Because Hyper-V is a virtualization product for Microsoft, which didn't support Linux earlier, and because of Debian's corporate operation, which has made Debian into a fast-growing phase, even Google has abandoned Linux customization to the Debian development camp, making Microsoft feel some pressure , Microsoft pulled up CentOS, which is why Hyper-V only supports CentOS, not other Linux derivative versions, and the support is not so reliable. Spit it out, then come to the point.

Topic: Hyper-V Architecture centos5.5 VPS installed LNMP time is not synchronized, resulting in some features of the site can not be used.

All the methods found on the internet failed. Then I looked for some documents and finally finished, tears running AH.

Linux's time management is strange he divides into the system time and the hardware time also subdivides into what UTC time. -_-| | |

Hardware time is fundamentally CMOS clock

Linux View hardware time: Hwclock--show

Linux View system time: Date-r

CentOS VPS Time zone synchronization.

System Time Section:

1. Edit time zone configuration file: Vi/etc/sysconfig/clock

Zone= "Asia/shanghai"

Utc=false #把UTC设置为false关闭状态

Arc=false

2. Run the following command

#删除默认配置

Rm-rf/etc/localtime

#重新指定配置

Ln-s/usr/share/zoneinfo/asia/shanghai/etc/localtime

#同步系统时间

Ntpdate-u pool.ntp.org

3. Hardware Time section:

#将硬件时间调整成与目前的系统时钟一致.

Hwclock--SYSTOHC

or clock--SYSTOHC

#强制系统时间写入CMOS中防止重启失效

Hwclock-w

or clock-w

The above steps, although successful, but my Hyper-V architecture CentOS system time is not allowed to go, 1 days can be a few minutes.

Use crontab to sync time to solve.

#编辑计划任务表

Vi/etc/crontab

#表中最后添加下面这行内容

5 * * * root/usr/sbin/ntpdate-u pool.ntp.org &&/sbin/clock--SYSTOHC

#每天5点半同步时间, clock--SYSTOHC is the meaning of the hard disk Time synchronization system time.