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代表硬件时间，sys代表系统时间，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：#########
一、时间服务器端配置
修改配置文件vi /etc/ntp.conf
1、客户端选择
1）允许任何客户端
restrict default nomodify
2）允许特定客户端
restrict 192.168.18.0 mask 255.255.255.0 nomodify
server 192.168.0.84
*二选一
2、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
3、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#########
一、linux客户端
1、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
2、客户端校验
ntpq -p查询上级时间服务器
ntpstat 查询状态
ntpdate
