CentOS7之NTP服务器简单配置

最新推荐文章于 2024-04-01 16:51:23 发布

转载最新推荐文章于 2024-04-01 16:51:23 发布 · 226 阅读

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原文链接：http://blog.51cto.com/13554498/2059429

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本文介绍如何在CentOS环境中部署NTP服务器和chrony服务来实现网络时间同步。内容包括NTP服务器的安装、配置及客户端设置，以及使用chrony作为替代方案的方法。

时间服务器
NTP（Network Time Protocol，网络时间协议）是用来使网络中的各个计算机时间同步的一种协议。
NTP服务器就是利用NTP协议提供时间同步服务的。

ntp软件（支持ntp协议） CentOS6自带
CentOS7需要安装的

chrony软件（支持ntp协议） CentOS7自带

环境准备
[root@Cobbler ~]# getenforce
Disabled
[root@Cobbler ~]# systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: man:firewalld(1)
[root@m02 ~]# hostname -I
10.0.0.62 172.16.1.62

第一种方法：NTP

服务端部署

下载软件
[root@m02 ~]# yum install -y ntp
[root@m02 ~]# rpm -qa ntp
ntp-4.2.6p5-25.el7.centos.2.x86_64
配置ntp文件
备份
[root@m02 ~]# cp /etc/ntp.conf{,.ori}
修改
[root@m02 ~]# vim /etc/ntp.conf

8 #restrict default nomodify notrap nopeer noquery
9 restrict default nomodify

21 #server 0.centos.pool.ntp.org iburst
22 #server 1.centos.pool.ntp.org iburst
23 #server 2.centos.pool.ntp.org iburst
24 #server 3.centos.pool.ntp.org iburst
25 server ntp1.aliyun.com

与备份文件对比
[root@m02 ~]# diff /etc/ntp.conf{,.ori}
8,9c8,9
< #restrict default nomodify notrap nopeer noquery
< restrict default nomodify

restrict default nomodify notrap nopeer noquery

21,25c21,25
< #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 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

启动服务

[root@m02 ~]# systemctl start ntpd

检查ntp是否能同步
[root@m02 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter

time5.aliyun.co 10.137.38.86 2 u 36 64 1 52.686 -1371.9 0.000

[root@m02 ~]# ntpstat
synchronised to NTP server (182.92.12.11) at stratum 3
time correct to within 982 ms
polling server every 64 s

客户端部署

下载软件
[root@Cobbler ~]# yum -y install ntpdate
测试是否同步
[root@Cobbler ~]# ntpdate 172.16.1.62
10 Jan 09:07:47 ntpdate[1504]: adjust time server 172.16.1.62 offset -0.001513 sec
定时任务

[root@Cobbler ~]# crontab -l
#时间同步
/5 * /usr/sbin/ntpdate 172.16.1.62 &>/dev/null

第二种方法：chrony

服务端部署

修改chrony配置文件
[root@m02 ~]# vim /etc/chrony.conf
1 # Use public servers from the pool.ntp.org project.
2 # Please consider joining the pool
(http://www.pool.ntp.org/join.html).
3 #server 0.centos.pool.ntp.org iburst
4 #server 1.centos.pool.ntp.org iburst
5 #server 2.centos.pool.ntp.org iburst
6 #server 3.centos.pool.ntp.org iburst
7 server ntp1.aliyun.com

26 # Allow NTP client access from local network.
27 #allow 192.168.0.0/16
28 allow 172.16.1.0/24
开启服务
[root@m02 ~]# systemctl start chronyd
客户端部署
修改配置文件
[root@Cobbler ~]# vim /etc/chrony.conf

1 # Use public servers from the pool.ntp.org project.
2 # Please consider joining the pool (http://www.pool.ntp.org/join.html).
3 #server 0.centos.pool.ntp.org iburst
4 #server 1.centos.pool.ntp.org iburst
5 #server 2.centos.pool.ntp.org iburst
6 #server 3.centos.pool.ntp.org iburst
7 server 172.16.1.62

开启服务
[root@Cobbler ~]# systemctl start chronyd
修改时间测试
[root@Cobbler ~]# date -s 1111
Wed Jan 10 11:11:00 CST 2018
查看日志
[root@Cobbler ~]# tailf /var/log/messages
Jan 10 09:30:26 Cobbler chronyd[1593]: Selected source 172.16.1.62
Jan 10 09:30:26 Cobbler chronyd[1593]: System clock wrong by -6348.794966 seconds, adjustment started
Jan 10 09:30:26 Cob[root@Cobbler ~]# date -s 1111
Wed Jan 10 11:11:00 CST 2018

5.查看时间
[root@Cobbler ~]# date
Wed Jan 10 11:15:47 CST 2018
[root@Cobbler ~]# date
Wed Jan 10 09:30:37 CST 2018

转载于:https://blog.51cto.com/13554498/2059429