Linux and cloud Computing--Phase two: NTP server Setup

Linux and cloud Computing--the second phase of Linux Server Setup

The first chapter: NTP Server Setup

650) this.width=650; "Src=" Http://s4.51cto.com/wyfs02/M02/84/7C/wKiom1eR3EWj8CJjAAECGMnPQ_I264.jpg-wh_500x0-wm_3 -wmp_4-s_2524553483.jpg "title=" server. jpg "alt=" wkiom1er3ewj8cjjaaecgmnpq_i264.jpg-wh_50 "/>

1.NTP Server (NTPd) Install the NTPD and configure the NTP server to complete the time adjustment.

[1] install the NTPd.

[[email protected] ~]# yum-y install NTP

[Email protected] ~]# vim/etc/ntp.conf

refer to Line 17, add the network segment in line 18th to allow access to your NTP server :

Restrict 192.168.96.0 mask 255.255.255.0 nomodify notrap

# Modifying a synchronized server

#server 0.centos.pool.ntp.org Iburst

#server 1.cen tos.pool.ntp.org Iburst

#server 2.centos.pool.ntp.org Iburst

#server 3.centos.pool.ntp.org Iburst

Server asia.pool.ntp.org Iburst

[Email protected] ~]# systemctl start ntpd

[email protected] ~]# Systemctl enable NTPD  

[2] If the firewall Firewalld is running , Note that the NTP service is released, and NTP uses UDP 123 port for communication.  

[Email protected] ~]# firewall-cmd--add-service=ntp--permanent

Success

[Email protected] ~]# Firewall-cmd--reload

Success

[3] Verify that NTP is working correctly .

[email protected] ~]# N tpq-p

Remote refID St T when poll reach delay offset jitter

==============================================================================

*210-140-66-77.J 133.243.238.163 2 U 33 64 7 209.189 53.766 58.151

2. NTP server (chrony) installs the Chrony and configures the NTP servers to complete the time adjustment. [1] installation Chrony.

[Email protected] ~]# yum-y install Chrony

[Email protected] ~]# vim/etc/chrony.conf

# Third line : Modify the synchronization time of the server  

#server 0.centos.pool.ntp.org Iburst

#server 1.centos.pool.ntp.org Iburst

#server 2.centos.pool.ntp.org Iburst

#server 3.centos.pool.ntp.org Iburst

Server asia.pool.ntp.org Iburst

# Section - Line : Configure the access requests that you intend to allow to receive the network segment

Allow 192.168.96.0/24

[Email protected] ~]# systemctl start chronyd

[email protected] ~]# Systemctl enable Chronyd  

[2] If the firewall Firewalld is running , Note that the NTP service is released, and NTP uses UDP 123 port for communication.  

[Email protected] ~]# firewall-cmd--add-service=ntp--permanent

Success

[Email protected] ~]# Firewall-cmd--reload

Success

[3] Verify the working status .

[Email protected] ~]# CHRONYC sources

Sources = 1

MS NAME/IP address stratum Poll Reach Lastrx Last sample

===============================================================================

^? 210.23.25.77 2 7 98-107ms[ -107ms] +/-193ms

3.NTP Client

[1] CentOS Client synchronization Time .

[Email protected] ~]# ntpdate asia.pool.ntp.org

7 Jul 17:47:40 ntpdate[12683]: Adjust time server 110.75.190.198 offset 0.079993 sec

How to configure date synchronization on Windows7:

Open the lower right corner date and time

650) this.width=650; "Src=" Http://s3.51cto.com/wyfs02/M00/84/7C/wKioL1eR2tbhdW_cAADR9XLTApw509.png-wh_500x0-wm_3 -wmp_4-s_3049411495.png "style=" Float:none; "title=" Picture 1.png "alt=" Wkiol1er2tbhdw_caadr9xltapw509.png-wh_50 "/>

Select Internet time and modify settings

650) this.width=650; "Src=" Http://s2.51cto.com/wyfs02/M02/84/7C/wKioL1eR2wKCa6PqAABaZwSGKBI509.png-wh_500x0-wm_3 -wmp_4-s_3051308951.png "title=" image 2.png "alt=" Wkiol1er2wkca6pqaabazwsgkbi509.png-wh_50 "/>

Enter the server address you just configured and try to synchronize.

For more video, please click-→http://edu.51cto.com/lesson/id-113651.html

This article is from the "11830455" blog, please be sure to keep this source http://11840455.blog.51cto.com/11830455/1828864

Linux and cloud Computing--Phase two: NTP server Setup