CentOS7配置时间和CentOS6搭建局域网NTP

NTP

2015年8月20日 星期四

17:34

CentOS 7配置本地时区和TIME ZONE

 

#用tzselect配置时区和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.

#选择时区

#? 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.

#键入CST+0中国时区

#UTC为国际时区

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]#

#加入全局环境变量

 

vi /etc/profile

export TZ='CST+0'

 

#硬件和系统时间同步（可选）

 

date -s 14:20:50

hwclock  --show 或者

clock  --show

设置硬件时间

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

硬件时钟与系统时钟同步：

# hwclock --hctosys 或者 # clock --hctosys  hc表明硬件时间，sys表明系统时间，即用硬件时钟同步系统时钟

系统时钟和硬件时钟同步：

# hwclock --systohc或者# clock --systohc  即用系统时钟同步硬件时钟

修改配置文件来修改时区

 

 

 

CentOS 6搭建局域网NTP服务器

 

#########服务器：#########

1、时间服务器端配置

修改配置文件vi /etc/ntp.conf

   

一、客户端选择

1）容许任何客户端

restrict default nomodify

2）容许特定客户端

restrict 192.168.18.0 mask 255.255.255.0 nomodify

server 192.168.0.84

*二选一

   

二、指定时间服务器

1）指定特定时间服务器，注释掉默认server服务器

server time-b.nist.gov

2）开启本地时间服务器，上述外网time-b.nist.gov失效时，内网充当时间服务器。

server 127.127.1.0 # local clock

fudge 127.127.1.0 stratum 10

三、重启时间服务

service ntpd restart

4、根据实际需求设置防火墙端口

udp 123

#########客户端#########

1、linux客户端

一、linux客户端修改配置文件，注释掉其它时间服务器，指定内网时间服务器，重启ok。

vim /etc/ntp.conf

server x.x.x.x

二、客户端校验

ntpq -p查询上级时间服务器

ntpstat 查询状态

ntpdate