CentOS7配置時間和CentOS6搭建局域網NTP

NTP

2015年8月20日 星期四

17:34

CentOS 7配置本地時區和TIME ZONE

 

#用tzselect配置時區和time zone

 

[root@localhost Asia]# /usr/bin/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.

#選擇時區

#? 11

Please enter the desired value of the TZ environment variable.

For example, GST-10 is a zone named GST that is 10 hours ahead (east) of UTC.

#鍵入CST+0中國時區

#UTC爲國際時區

CST+0

awk: cmd. line:5: warning: escape sequence `\.' treated as plain `.'

 

The following information has been given:

 

    TZ='CST+0'

 

Therefore TZ='CST+0' will be used.

Local time is now:    Thu May 12 18:13:06 CST 2016.

Universal Time is now:    Thu May 12 18:13:06 UTC 2016.

Is the above information OK?

1) Yes

2) No

#? 1

 

You can make this change permanent for yourself by appending the line

    TZ='CST+0'; 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:

CST+0

[root@localhost Asia]# /usr/bin/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 May 13 02:13:32 CST 2016.

Universal Time is now:    Thu May 12 18:13:32 UTC 2016.

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@localhost Asia]# date

Thu May 12 18:13:40 CST 2016

[root@localhost Asia]# clock

Thu 12 May 2016 06:13:44 PM CST -0.396667 seconds

[root@localhost Asia]#

#加入全局環境變量

 

vi /etc/profile

export TZ='CST+0'

 

#硬件和系統時間同步（可選）

 

date -s 14:20:50

hwclock  --show 或者

clock  --show

設置硬件時間

hwclock --set --date="06/18/14 14:55" （月/日/年時:分:秒）或者# clock --set --date="06/18/14 14:55" （月/日/年時:分:秒）

硬件時鐘與系統時鐘同步：

# hwclock --hctosys 或者 # clock --hctosys  hc表明硬件時間，sys表明系統時間，即用硬件時鐘同步系統時鐘

系統時鐘和硬件時鐘同步：

# hwclock --systohc或者# clock --systohc  即用系統時鐘同步硬件時鐘

修改配置文件來修改時區

 

 

 

CentOS 6搭建局域網NTP服務器

 

#########服務器：#########

1、時間服務器端配置

修改配置文件vi /etc/ntp.conf

   

一、客戶端選擇

1）容許任何客戶端

restrict default nomodify

2）容許特定客戶端

restrict 192.168.18.0 mask 255.255.255.0 nomodify

server 192.168.0.84

*二選一

   

二、指定時間服務器

1）指定特定時間服務器，註釋掉默認server服務器

server time-b.nist.gov

2）開啓本地時間服務器，上述外網time-b.nist.gov失效時，內網充當時間服務器。

server 127.127.1.0 # local clock

fudge 127.127.1.0 stratum 10

三、重啓時間服務

service ntpd restart

4、根據實際需求設置防火牆端口

udp 123

#########客戶端#########

1、linux客戶端

一、linux客戶端修改配置文件，註釋掉其它時間服務器，指定內網時間服務器，重啓ok。

vim /etc/ntp.conf

server x.x.x.x

二、客戶端校驗

ntpq -p查詢上級時間服務器

ntpstat 查詢狀態

ntpdate