Linux Sync time

There are two Linux times. One is the system time, one is the hardware time!

When synchronizing national time, there will be an error: No server suitable for synchronization found

Now the state authorized 210.72.145.44 is temporarily unable to use

This article is mainly about Ntpdate:

Installation of NTP yum install ntp-y

Second, change the time zone

Cp-y/usr/share/zoneinfo/asia/shanghai/etc/localtime

Vim/etc/sysconfig/clock

Zone= "Asia/shanghai"
Utc=false
Arc=false

Three, synchronization time

/usr/sbin/ntpdate-u cn.pool.ntp.org

Iv. Write Hardware time

Hwclock-w

Automatic Time synchronization

1. Configure boot Check

Vi/etc/rc.d/rc.local

/usr/sbin/ntpdate-u cn.pool.ntp.org>/dev/null 2>&1; /sbin/hwclock-w

2. Configure Scheduled Tasks

* * * * root/usr/sbin/ntpdate-u cn.pool.ntp.org >/dev/null 2>&1; /sbin/hwclock-w

Linux Sync time