【CentOS】NTP Server
////// 安装
///
# yum install ntp
已加载插件：fastestmirror, langpacks
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository contrib is listed more than once in the configuration
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
软件包 ntp-4.2.6p5-19.el7.centos.3.x86_64 已安装并且是最新版本
无须任何处理
#
///
/// vi /etc/ntp.conf
///
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
server time.lib.tsinghua.edu.cn
server cn.pool.ntp.org
///
/// systemctl enable/status/start
///
# systemctl enable ntpd.service
# systemctl status ntpd.service
ntpd.service - Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled)
Active: inactive (dead)
# systemctl start ntpd.service
# systemctl status ntpd.service
ntpd.service - Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled)
Active: active (running) since 六 2015-11-14 23:48:34 CST; 2s ago
Process: 26192 ExecStart=/usr/sbin/ntpd -u ntp:ntp $OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 26193 (ntpd)
CGroup: /system.slice/ntpd.service
└─26193 /usr/sbin/ntpd -u ntp:ntp -g
///
/// firewall
///
# firewall-cmd --add-service=ntp --permanent
success
# firewall-cmd --list-all
public (default, active)
interfaces: enp3s0f0 enp3s0f1
sources:
services: dhcpv6-client mysql ssh
ports: 8703/tcp
masquerade: no
forward-ports:
icmp-blocks:
rich rules:
# firewall-cmd --reload
success
# firewall-cmd --list-all
public (default, active)
interfaces: enp3s0f0 enp3s0f1
sources:
services: dhcpv6-client mysql ntp ssh
ports:
masquerade: no
forward-ports:
icmp-blocks:
rich rules:
#
// for old version, iptables
iptables -A INPUT -p udp -dport 123 -j ACCEPT
///
/// check on server
///
# ntpq -p
remote refid st t when poll reach delay offsetjitter
==============================================================================
web.lib.tsinghu .INIT. 16 u - 64 0 0.000 0.000 0.000
+news.neu.edu.cn 202.118.1.46 2 u 24 64 1 12.675 -5.860 0.000
+dns1.synet.edu. 202.118.1.46 2 u 14 64 1 12.546 -5.778 1.238
*202.118.1.130 202.118.1.46 2 u 13 64 1 12.399 -5.711 0.797
dns.sjtu.edu.cn .INIT. 16 u - 64 0 0.000 0.000 0.000
///
/// test on client
///
#!/bin/bash
# sync time
/usr/sbin/ntpdate 192.168.1.134
# write to hw
/usr/sbin/hwclock -w
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