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NTP服务器监听端口为UDP的123，需要在本地防火墙开启运行客户端访问123端口;
- echo '-A INPUT -m state --state NEW -m udp -p udp --deport 123 -j ACCEPT'>> /etc/sysconfig/iptables
- ntp服务安装与配置
- yum install ntp ntpdate -y
- /etc/init.d/ntpd restart
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同步nptd时间服务器时间
- ntpd -p
- 同步/etc/ntp.conf中的外网时间服务器
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/etc/init.d/ntpd stop
- ntpdate pool.ntp.org
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29 Nov 01:42:23 ntpdate[2115]: adjust time server 85.199.214.101 offset 0.015287 sec
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#安装ntpdate
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yum -y install ntp
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#编辑计划任务
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crontab -e
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0 0 * * * /usr/sbin/ntpdate 192.168.199.125 >>/var/log/ntpstats/ntp.log 2>&1
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#编辑/etc/ntp.conf配置
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vim /etc/ntp.conf
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driftfile /var/lib/ntp/drift
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restrict default kod nomodify notrap nopeer noquery
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restrict -6 default kod nomodify notrap nopeer noquery
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#开启内部递归网络接口lo
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restrict 127.0.0.1
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restrict -6 ::1
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#上级时间服务器
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server 192.168.199.125
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fudge 192.168.199.125 stratum 10
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includefile /etc/ntp/crypto/pw
- keys /etc/ntp/keys
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- ntpdate 192.168.199.125
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29 Nov 01:42:23 ntpdate[2115]: adjust time server 85.199.214.101 offset 0.015287 sec