Centos配置NTP服务器

NTP服务端：

1. 安装NTP服务

rpm -qa|grep ntp　　　　　　#查看是否安装ntp，以下为已安装

yum -y install ntp ntpdate 　　#安装命令

 

2. 查找当前地区最适合的时间服务器

http://www.pool.ntp.org/zone/asia

注：本章使用aliyun时间服务器

ntp1.aliyun.com

ntp2.aliyun.com

ntp3.aliyun.com

ntp4.aliyun.com

 

3.验证ntp服务是否开启

yum install -y nmap

nmap -sU ntp1.aliyun.com -p 123

 

4. 编辑/etc/ntp.conf

#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 iburst

#server ntp2.aliyun.com iburst
#server ntp3.aliyun.com iburst
#server ntp4.aliyun.com iburst

server 127.127.1.0 iburst　　　　　　#作为服务端配置这条即可

 

5. 启动ntp服务

systemctl start ntpd.service

systemctl enable ntpd.service

 

6.配置服务器时间

date　　　　　  #系统时间

date -s "2019-12-06 09:59:00"

hwclock　　　　#硬件时间

hwclock --set --date "2019-12-06 09:59:30"

 

NTP客户端：

1. 安装ntp服务

rpm -qa|grep ntp

yum -y install ntp ntpdate 

 

2. 设置ntp.conf

# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
restrict 192.168.0.60 nomodify notrap noquery

# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#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 192.168.0.60

 

3.同步ntp服务时间

ntpdate -u 192.168.0.60

ntpdate参数介绍：

-q 　Query only - don’t set the clock.

-s 　Divert logging output from the standard output (default) to the system syslog facility. This is
designed primarily for convenience of cron scripts.

-u 　Direct ntpdate to use an unprivileged port for outgoing packets. This is most useful when behind a
firewall that blocks incoming traffic to privileged ports, and you want to synchronize with hosts
beyond the firewall. Note that the -d option always uses unprivileged ports.

 

4. 创建同步时间定时任务

crontab -e

0 * * * * /usr/sbin/ntpdate -u 192.168.0.60　　　　#每小时同步

crontab -l

 

5.验证时间服务

ntpq -p

 

6.centos6/7开启ntp服务

centos6：

　　service ntpd start

　　chkconfig ntpd on

centos7：

　　systemctl start ntpd.service

　　systemctl enable ntpd.service