Shulou(Shulou.com)06/02 Report--

1. Brief introduction to NTP

NTP (Network Time Protocol, Network time Protocol) is a protocol used to synchronize the time of various computers in the network. Its purpose is to synchronize the computer clock to UTC UTC. Its accuracy can reach 0.1ms in the local area network and 1-50ms in most places on the Internet.

NTP server uses NTP protocol to provide time synchronization service.

2. NTP server installation

Yum-y install ntp

Vim / etc/ntp.conf

Allow any client of ip to synchronize time

Modify the restrict default kod nomodify notrap nopeer noquery to look like this line:

Restrict default nomodify # nomodify client can synchronize

# change the default time synchronization source annotation to an available source

# 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 ntp1.aliyun.com

Server time.nist.gov

Add timing task synchronization time

Crontab-e

* / 5 * / usr/sbin/ntpdate time.nist.gov > / dev/null 2 > & 1

/ etc/init.d/ntpd start

Chkconfig ntpd on

Ntpq-p ntpstat # to see synchronization status

3 client time synchronization

Crontab-e

* / 15 * / usr/sbin/ntpdate 192.168.100.102 (server-side IP)

Be careful

The client will have to wait a few minutes before synchronizing with the newly started ntp server, otherwise it will prompt a no server suitable for synchronization found error

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