一、首先选择一台同步阿里云时间服务器
1、安装ntp
yum install ntp
2、配置ntp.conf
[root@localhost ~]# vim /etc/ntp.conf
增加
restrict 172.28.5.0 mask 255.255.255.0 nomondify notrap
172.28.5.0为服务器间内网网段
# 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 ntp1.aliyun.com server time1.aliyun.com server 127.127.1.0
注释掉官方时间服务器，增加阿里云和本地时间服务器
3、启动ntp服务
systemctl start ntpd
4、查看状态
systemctl status ntpd
[root@localhost ~]# netstat -tunlp|grep ntpd udp 0 0 172.28.5.102:123 0.0.0.0:* 12743/ntpd udp 0 0 127.0.0.1:123 0.0.0.0:* 12743/ntpd udp 0 0 0.0.0.0:123 0.0.0.0:* 12743/ntpd udp6 0 0 fe80::d860:7229:c98:123 :::* 12743/ntpd udp6 0 0 ::1:123 :::* 12743/ntpd udp6 0 0 :::123 :::* 12743/ntpd
5、查看同步状态
[root@localhost ~]# ntpstat synchronised to NTP server (203.107.6.88) at stratum 3 time correct to within 30 ms polling server every 1024 s [root@localhost ~]#
6、其他服务器部署NTP
yum install ntp
7、命令行执行ntpdate同步时间
[root@bogon ~]# /usr/sbin/ntpdate 172.28.5.102 && hwclock --systohc 26 Apr 09:53:03 ntpdate[20030]: adjust time server 172.28.5.102 offset 0.001725 sec
8、设置定时任务同步
*/30 * * * * /usr/sbin/ntpdate 172.28.5.102 && hwclock --systohc
