Linux Cache

Webmin是一个在类unix系统下便于管理的基于WEB界面的工具。

#
[root@monitor webmin]# ./setup.sh
***********************************************************************
* Welcome to the Webmin setup script, version 1.610 *
***********************************************************************
Webmin is a web-based interface that allows Unix-like operating
systems and common Unix services to be easily administered.

Installing Webmin in /usr/local/webmin …

***********************************************************************
Webmin uses separate directories for configuration files and log files.
Unless you want to run multiple versions of Webmin at the same time
you can just accept the defaults.

Config file directory [/etc/webmin]:
Log file directory [/var/webmin]:

***********************************************************************
Webmin is written entirely in Perl. Please enter the full path to the
Perl 5 interpreter on your system.

Full path to perl (default /usr/bin/perl):

Testing Perl …
Perl seems to be installed ok

***********************************************************************
Operating system name: CentOS Linux
Operating system version: 6.3

***********************************************************************
Webmin uses its own password protected web server to provide access
to the administration programs. The setup script needs to know :
– What port to run the web server on. There must not be another
web server already using this port.
– The login name required to access the web server.
– The password required to access the web server.
– If the webserver should use SSL (if your system supports it).
– Whether to start webmin at boot time.

Web server port (default 10000):
Login name (default admin):
Login password:
Password again:
The Perl SSLeay library is not installed. SSL not available.
Start Webmin at boot time (y/n): y
***********************************************************************
Creating web server config files..
..done

Creating access control file..
..done

Inserting path to perl into scripts..
..done

Creating start and stop scripts..
..done

Copying config files..
..done

Configuring Webmin to start at boot time..
..done

Creating uninstall script /etc/webmin/uninstall.sh ..
..done

Changing ownership and permissions ..
..done

Running postinstall scripts ..
PID file /var/webmin/miniserv.pid does not exist
..done

Enabling background status collection ..
PID file /var/webmin/miniserv.pid does not exist
..done

Attempting to start Webmin mini web server..
Starting Webmin server in /usr/local/webmin
Pre-loaded WebminCore
..done

***********************************************************************
Webmin has been installed and started successfully. Use your web
browser to go to

http://monitor:10000/

and login with the name and password you entered previously.

[root@monitor webmin]#

配置服务器端

编辑配置文件

#vi /etc/ntp.conf

限定主机或子网
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

开启上游时间服务器访问
server 0.centos.pool.ntp.org
server 1.centos.pool.ntp.org
server 2.centos.pool.ntp.org

查看服务运行状态
[root@oracle ~]# service ntpd status
ntpd is stopped

启动服务
[root@oracle ~]# service ntpd start
Starting ntpd: [ OK ]

查看监听端口
[root@oracle ~]# netstat -ltun |grep 123
udp 0 0 192.168.2.122:123 0.0.0.0:*

udp 0 0 127.0.0.1:123 0.0.0.0:*

udp 0 0 0.0.0.0:123 0.0.0.0:*

udp 0 0 ::1:123 :::*

udp 0 0 fe80::250:56ff:feab:2d4e:123 :::*

udp 0 0 :::123 :::*

查看服务器同步状态
[root@oracle ~]# ntpstat
unsynchronised
time server re-starting
polling server every 64 s

[root@oracle ~]# ntpstat
synchronised to NTP server (202.112.29.82) at stratum 3
time correct to within 201 ms
polling server every 64 s

客户端时间同步设置

安装时间同步软件包
yum install ntpdate

同步时间
[root@monitor ~]# ntpdate time.nist.gov
14 Nov 11:29:31 ntpdate[3316]: step time server 128.138.141.172 offset

172.282249 sec

查看系统当前时间
[root@monitor ~]# date
Wed Nov 14 11:29:36 CST 2012

查看硬件时间
#hwclock –show
Wed 14 Nov 2012 11:37:34 AM CST -0.625478 seconds

将系统时间写入硬件
#hwclock -w

使用计划任务定时与时间服务器同步

#vi /etc/crontab
 00 1 * * * ntpdate 192.168.2.122;hwclock -w

[root@oracle ~]# 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) east China - Beijing, Guangdong, Shanghai, etc.
2) Heilongjiang (except Mohe), Jilin
3) central China - Sichuan, Yunnan, Guangxi, Shaanxi, Guizhou, etc.
4) most of Tibet & Xinjiang
5) west Tibet & Xinjiang
#? 1

The following information has been given:

China
east China - Beijing, Guangdong, Shanghai, etc.

Therefore TZ='Asia/Shanghai' will be used.
Local time is now: Wed Nov 28 10:24:46 CST 2012.
Universal Time is now: Wed Nov 28 02:24:46 UTC 2012.
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@oracle ~]#