4-1·NTP服务器配置搭建

一·NTP服务器搭建

1)安装NTP服务

[root@localhost ~]# yum -y install ntp[root@localhost ~]# vim /etc/ntp.conf 

restrict 172.25.0.0 mask 255.255.255.0 nomodify notrap          //添加接受的地址范围# Use public servers from the pool.ntp.org project.# Please consider joining the pool (http://www.pool.ntp.org/join.html).#server 0.rhel.pool.ntp.org iburst#server 1.rhel.pool.ntp.org iburst#server 2.rhel.pool.ntp.org iburst#server 3.rhel.pool.ntp.org iburstserver s1a.time.edu.cn iburst                                   //中国邮电大学NTP服务器

[root@localhost ~]# systemctl start ntpd[root@localhost ~]# systemctl enable ntpd

2）防火墙开启端口，NTP默认端口号UDP123

[root@localhost ~]# firewall-cmd --add-service=ntp --permanent         //永久生效放行ntp服务[root@localhost ~]# firewall-cmd --reload                      //重读防火墙

3）查看同步

[root@localhost ~]# ntpq -p     remote           refid      st t when poll reach   delay   offset  jitter==============================================================================*10.112.202.in-a 202.118.1.46     2 u    9   64    1   93.632    9.389   5.115

4）配置ntp客户端

[root@localhost ~]# yum -y install ntpdate                     //安装客户端软件[root@localhost ~]# ntpdate s1a.time.edu.cn                        //指定服务器域名[root@localhost ~]# systemctl restart ntpdate                      //重启服务