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This article introduces the relevant knowledge of "how to set time in CentOS system". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Install ntp

The code is as follows:

# yum install ntp

2. Execute the command:

The code is as follows:

# ntpdate us.pool.ntp.org .

The time zone of rhas5 exists as a file, and the current time zone file is in / etc/localtime

Files for other time zones are stored under / usr/share/zoneinfo

3. We use the time of Dongba District (+ 0800), Beijing and Shanghai.

So copy # cp-f / usr/share/zoneinfo/Asia/Shanghai to / etc/localtime

The code is as follows:

# cp-f / usr/share/zoneinfo/Asia/Shanghai / etc/localtime

# reboot

After restart, date checks the time, current time zone date-R, Linux time zone and time

I. time zone

1. View current time zone

The code is as follows:

Date-R

two。 Modify the setting time zone

Methods (1)

The code is as follows:

Tzselect

Method (2) is limited to RedHat Linux and CentOS systems.

The code is as follows:

Timeconfig

Method (3) is suitable for Debian.

The code is as follows:

Dpkg-reconfigure tzdata

3. Copy the appropriate time zone file and replace the CentOS system time zone file, or create a link file

The code is as follows:

Cp / usr/share/zoneinfo/$ Primary time Zone / $Sub time Zone / etc/localtime

It can be used in China:

The code is as follows:

Cp / usr/share/zoneinfo/Asia/Shanghai / etc/localtime

Second, time

1. Check the time and date

The code is as follows:

Date

2. Set time and date

Order to set the CentOS system date to November 30th, 2011

The code is as follows:

Date-s 11-30-11

Command to set the CentOS system time to 09:13:00

The code is as follows:

Date-s 09:13:00

3. Write the current time and date to BIOS to avoid invalidation after restart

The code is as follows:

Hwclock-w

Timing synchronization time

Synchronize the system time with the hardware clock, with:

The code is as follows:

Wclock-hctosys

# or

Clock-hctosys

Instead, synchronize the hardware clock with the system time:

The code is as follows:

Hwclock-systohc

# or

Clock-systohc

Let the system time synchronize the hardware time every ten minutes.

The code is as follows:

[hqw@localhost root] $vi / etc/crontab

SHELL=/bin/bash

PATH=/sbin:/bin:/usr/sbin:/usr/bin

MAILTO=root

HOME=/

# run-parts

01 * root run-parts / etc/cron.hourly

02 4 * root run-parts / etc/cron.daily

22 4 * 0 root run-parts / etc/cron.weekly

42 4 1 * * root run-parts / etc/cron.monthly

* / 10 * root hwclock-- hctosys # join this line and execute hwclock-- hctosys every 10 minutes

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