Eight centos project instances-NTP clock Server Configuration

1. Configure NTP on zzsrv1 1.1. Install NTP

# Yum list | grep NTP

Ntpdate. x86_64 4.2.6p5-18. el7.centos @ anaconda

Fontpackages-devel.noarch 1.44-8. el7 Base

Fontpackages-filesystem.noarch 1.44-8. el7 Base

Fontpackages-tools.noarch 1.44-8. el7 Base

NTP. x86_64 4.2.6p5-18. el7.centos Base

Ntp-doc.noarch 4.2.6p5-18. el7.centos Base

Ntp-perl.noarch 4.2.6p5-18. el7.centos Base

SNTP. x86_64 4.2.6p5-18. el7.centos Base

# Rpm-Qa | grep NTP

Ntpdate-4.2.6p5-18.el7.centos.x86_64

Manually check the time. There is a clock server 192.168.1.11 in the current production environment.

# Ntpdate 192.168.1.11

11 Aug 20:01:57 ntpdate [2450]: adjust time server 192.168.1.11 offset-0.082365 Sec

# Hwclock -- systohc

# Yum-y install NTP

Autogen-libopts-5.18-5.el7.x86_64.rpm

Ntp-4.2.6p5-18.el7.centos.x86_64.rpm

1.2. Configuration

# Rpm-QC NTP

/Etc/NTP. conf

/Etc/NTP/crypto/PW

/Etc/sysconfig/ntpd

# Cd/etc/

# Cp NTP. conf NTP. conf. Origin

# Vi NTP. conf

Delete all content. Only the upstream server is retained.

Server 0.centos.pool.ntp.org

Server 1.centos.pool.ntp.org

Server 2.centos.pool.ntp.org

Server 3.centos.pool.ntp.org

# Service ntpd start

Redirecting to/bin/systemctl start ntpd. Service

View logs

Systemd: Starting Network Time Service...

NTPD [2622]: NTPD [email protected] wed Jun 18 21:20:36 UTC 2014 (1)

NTPD [2623]: PROTO: Precision = 0.203 USEC

NTPD [2623]: 0.0.0.0 c01d 0d Kern Kernel Time sync Enabled

NTPD [2623]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123

NTPD [2623]: Listen and drop on 1 v6wildcard: UDP 123

NTPD [2623]: Listen normally on 2 lo 127.0.0.1 UDP 123

NTPD [2623]: Listen normally on 3 eno16777728 192.168.188.11 UDP 123

NTPD [2623]: Listen normally on 4 lo: 1 udp 123

NTPD [2623]: Listen normally on 5 eno16777728 fe80: 20c: 29ff: fea4: 2e39 UDP 123

NTPD [1, 2623]: listening on routing socket on FD #22 for interface updates

Systemd: started Network Time Service.

NTPD [2623]: 0.0.0.0 c016 06 restart

NTPD [2623]: 0.0.0.0 c012 02 freq_set kernel 0.000 ppm

NTPD [2623]: 0.0.0.0 c011 01 freq_not_set

NTPD [2623]: 0.0.0.0 c614 04 freq_mode

# Systemctl enable ntpd

Ln-s '/usr/lib/systemd/system/ntpd. service'/etc/systemd/system/multi-user.target.wants/ntpd. Service'

# Netstat-an | grep 123

UDP 0 0 192.168.188.11: 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 :*

UDP6 0 0 fe80: 20c: 29ff: fea4: 123 :::*

UDP6 0 0: 1: 123 :::*

UDP6 0 0: 123 :::*

UNIX 3 [] stream connected 12323.

UNIX 3 [] stream connected 16123.

UNIX 3 [] stream connected 12324/run/systemd/Journal/stdout

1.3. Test

On another Linux server

# Ntpdate 192.168.188.11

11 Aug 20:18:15 ntpdate [12840]: adjust time server 192.168.188.11 offset 0.004473 Sec

When the school is completed on windows

Set automatic calibration

# Rpm-QC crontabs

/Etc/crontab

/Etc/sysconfig/run-Parts

Write daily school script

# Cd/etc/cron. daily/

# Ll

Total 16

-Rwxr-XR-X. 1 Root 332 Jun 27 :07 0yum-daily.cron

-Rwx ------. 1 Root 180 Jul 31 2013 logrotate

-Rwxr-XR-X. 1 Root 618 mar 18 man-db.cron

-Rwxr-x ---. 1 Root 192 Jan 27 2014 mlocate

# Vi checktime. Sh

Ntpdate 192.168.188.11

Hwclock -- systohc

# Chmod + x checktime. Sh

Test script

#./Checktime. Sh

11 Aug 20:25:49 ntpdate [12897]: adjust time server 192.168.188.11 offset 0.003041 Sec

# Ll

Total 20

-Rwxr-XR-X. 1 Root 332 Jun 27 :07 0yum-daily.cron

-Rwxr-XR-x 1 Root 41 Aug 11 20:25 checktime. Sh

-Rwx ------. 1 Root 180 Jul 31 2013 logrotate

-Rwxr-XR-X. 1 Root 618 mar 18 man-db.cron

-Rwxr-x ---. 1 Root 192 Jan 27 2014 mlocate

This article from the "Liu Qiong @ Tiandao reward diligence" blog, please be sure to keep this source http://lqiong.blog.51cto.com/8170814/1559078

Eight centos project instances-NTP clock Server Configuration